chore(deps): bump github.com/TwiN/deepmerge from 0.2.1 to 0.2.2 (#922)

Bumps [github.com/TwiN/deepmerge](https://github.com/TwiN/deepmerge) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/TwiN/deepmerge/releases)
- [Commits](https://github.com/TwiN/deepmerge/compare/v0.2.1...v0.2.2)

---
updated-dependencies:
- dependency-name: github.com/TwiN/deepmerge
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.dockerignore

@@ -4,4 +4,5 @@ Dockerfile
 .idea
 .git
 web/app
-*.db
+*.db
+testdata

.examples/docker-compose-mtls/certs/client/client.crt

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.examples/docker-compose-mtls/certs/client/client.key

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+-----BEGIN RSA PRIVATE KEY-----
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.examples/docker-compose-mtls/certs/server/ca.crt

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+-----END CERTIFICATE-----

.examples/docker-compose-mtls/certs/server/server.key

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+7CP4CZmMDWwHWsjMS/HGZgvPPbmWhaeZZmFyYi7I8MruJPhlhlw6YoUIV9Vvp8zE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-----END RSA PRIVATE KEY-----

.examples/docker-compose-mtls/config/config.yaml

@@ -0,0 +1,13 @@
+endpoints:
+  - name: example
+    url: https://nginx
+    interval: 30s
+    conditions:
+      - "[STATUS] == 200"
+    client:
+      # mtls
+      insecure: true
+      tls:
+        certificate-file: /certs/client.crt
+        private-key-file: /certs/client.key
+        renegotiation: once

.examples/docker-compose-mtls/docker-compose.yml

@@ -0,0 +1,27 @@
+version: "3.9"
+services:
+  nginx:
+    image: nginx:stable
+    volumes:
+      - ./certs/server:/etc/nginx/certs
+      - ./nginx:/etc/nginx/conf.d
+    ports:
+      - "8443:443"
+    networks:
+      - mtls
+
+  gatus:
+    image: twinproduction/gatus:latest
+    restart: always
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./config:/config
+      - ./certs/client:/certs
+    environment:
+      - GATUS_CONFIG_PATH=/config
+    networks:
+      - mtls
+
+networks:
+  mtls:

.examples/docker-compose-mtls/nginx/default.conf

@@ -0,0 +1,16 @@
+server {
+    listen                  443 ssl;
+
+    ssl_certificate         /etc/nginx/certs/server.crt;
+    ssl_certificate_key     /etc/nginx/certs/server.key;
+    ssl_client_certificate  /etc/nginx/certs/ca.crt;
+    ssl_verify_client       on;
+
+    location / {
+      if ($ssl_client_verify != SUCCESS) {
+        return 403;
+      }
+      root   /usr/share/nginx/html;
+      index  index.html index.htm;
+    }
+}

.examples/docker-compose-multiple-config-files/config/global.yaml

@@ -1,5 +1,4 @@
 metrics: true
-debug: false
 ui:
   header: Example Company
   link: https://example.org

.examples/docker-compose-postgres-storage/config/config.yaml

@@ -1,6 +1,6 @@
 storage:
   type: postgres
-  path: "postgres://username:password@postgres:5432/gatus?sslmode=disable"
+  path: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable"
 
 endpoints:
   - name: back-end
@@ -32,7 +32,7 @@ endpoints:
       query-name: "example.com"
       query-type: "A"
     conditions:
-      - "[BODY] == 93.184.216.34"
+      - "[BODY] == 93.184.215.14"
       - "[DNS_RCODE] == NOERROR"
 
   - name: icmp-ping

.examples/docker-compose-postgres-storage/docker-compose.yml

@@ -18,6 +18,10 @@ services:
     restart: always
     ports:
       - "8080:8080"
+    environment:
+      - POSTGRES_USER=username
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=gatus
     volumes:
       - ./config:/config
     networks:

.examples/docker-compose-sqlite-storage/config/config.yaml

@@ -32,7 +32,7 @@ endpoints:
       query-name: "example.com"
       query-type: "A"
     conditions:
-      - "[BODY] == 93.184.216.34"
+      - "[BODY] == 93.184.215.14"
       - "[DNS_RCODE] == NOERROR"
 
   - name: icmp-ping

.github/dependabot.yml

@@ -4,12 +4,10 @@ updates:
     directory: "/"
     labels: ["dependencies"]
     schedule:
-      interval: "weekly"
+      interval: "daily"
-      day: "wednesday"
   - package-ecosystem: "gomod"
     directory: "/"
-    open-pull-requests-limit: 1
+    open-pull-requests-limit: 3
     labels: ["dependencies"]
     schedule:
-      interval: "weekly"
+      interval: "daily"
-      day: "wednesday"

.github/workflows/benchmark.yml

@@ -20,11 +20,11 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version: 1.23.3
           repository: "${{ github.event.inputs.repository || 'TwiN/gatus' }}"
           ref: "${{ github.event.inputs.ref || 'master' }}"
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Benchmark
         run: go test -bench=. ./storage/store

.github/workflows/publish-experimental.yml

@@ -5,20 +5,20 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Get image repository
         run: echo IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Login to Docker Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64
           pull: true

.github/workflows/publish-latest-to-ghcr.yml

@@ -5,34 +5,34 @@ on:
     branches: [master]
     types: [completed]
 concurrency:
-  group: ${{ github.workflow }}
+  group: ${{ github.event.workflow_run.head_repository.full_name }}::${{ github.event.workflow_run.head_branch }}::${{ github.workflow }}
   cancel-in-progress: true
 jobs:
   publish-latest-to-ghcr:
     runs-on: ubuntu-latest
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ (github.event.workflow_run.conclusion == 'success') && (github.event.workflow_run.head_repository.full_name == github.repository) }}
     permissions:
       contents: read
       packages: write
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Get image repository
         run: echo IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Login to Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
           tags: ${{ env.IMAGE_REPOSITORY }}:latest

.github/workflows/publish-latest.yml

@@ -5,30 +5,30 @@ on:
     branches: [master]
     types: [completed]
 concurrency:
-  group: ${{ github.workflow }}
+  group: ${{ github.event.workflow_run.head_repository.full_name }}::${{ github.event.workflow_run.head_branch }}::${{ github.workflow }}
   cancel-in-progress: true
 jobs:
   publish-latest:
     runs-on: ubuntu-latest
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ (github.event.workflow_run.conclusion == 'success') && (github.event.workflow_run.head_repository.full_name == github.repository) }}
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Get image repository
         run: echo IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Login to Docker Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
           tags: ${{ env.IMAGE_REPOSITORY }}:latest

.github/workflows/publish-release-to-ghcr.yml

@@ -10,25 +10,25 @@ jobs:
       packages: write
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Get image repository
         run: echo IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Get the release
         run: echo RELEASE=${GITHUB_REF/refs\/tags\//} >> $GITHUB_ENV
       - name: Login to Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
           tags: |

.github/workflows/publish-release.yml

@@ -8,24 +8,24 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Get image repository
         run: echo IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Get the release
         run: echo RELEASE=${GITHUB_REF/refs\/tags\//} >> $GITHUB_ENV
       - name: Login to Docker Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
           tags: |

.github/workflows/test.yml

@@ -14,12 +14,12 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
-    timeout-minutes: 5
+    timeout-minutes: 10
     steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version: 1.23.3
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build binary to make sure it works
         run: go build
       - name: Test
@@ -28,6 +28,7 @@ jobs:
         # was configured by the "Set up Go" step (otherwise, it'd use sudo's "go" executable)
         run: sudo env "PATH=$PATH" "GOROOT=$GOROOT" go test ./... -race -coverprofile=coverage.txt -covermode=atomic
       - name: Codecov
-        uses: codecov/codecov-action@v3.1.1
+        uses: codecov/codecov-action@v5.1.2
         with:
           files: ./coverage.txt
+          token: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -17,4 +17,5 @@ node_modules
 *.db-shm
 *.db-wal
 gatus
-config/config.yml
+config/config.yml
+config.yaml

Dockerfile

@@ -3,6 +3,7 @@ FROM golang:alpine as builder
 RUN apk --update add ca-certificates
 WORKDIR /app
 COPY . ./
+RUN go mod tidy
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gatus .
 
 # Run Tests inside docker image if you don't have a configured go environment
@@ -14,6 +15,8 @@ FROM scratch
 COPY --from=builder /app/gatus .
 COPY --from=builder /app/config.yaml ./config/config.yaml
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-ENV PORT=8080
+ENV GATUS_CONFIG_PATH=""
+ENV GATUS_LOG_LEVEL="INFO"
+ENV PORT="8080"
 EXPOSE ${PORT}
 ENTRYPOINT ["/gatus"]

Makefile

@@ -1,17 +1,18 @@
 BINARY=gatus
 
-# Because there's a folder called "test", we need to make the target "test" phony
+.PHONY: install
-.PHONY: test
-
 install:
-	go build -mod vendor -o $(BINARY) .
+	go build -v -o $(BINARY) .
 
+.PHONY: run
 run:
 	GATUS_CONFIG_PATH=./config.yaml ./$(BINARY)
 
+.PHONY: clean
 clean:
 	rm $(BINARY)
 
+.PHONY: test
 test:
 	go test ./... -cover
 

alerting/alert/alert.go

@@ -1,8 +1,14 @@
 package alert
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"errors"
+	"strconv"
 	"strings"
+
+	"github.com/TwiN/logr"
+	"gopkg.in/yaml.v3"
 )
 
 var (
@@ -10,7 +16,7 @@ var (
 	ErrAlertWithInvalidDescription = errors.New("alert description must not have \" or \\")
 )
 
-// Alert is a core.Endpoint's alert configuration
+// Alert is endpoint.Endpoint's alert configuration
 type Alert struct {
 	// Type of alert (required)
 	Type Type `yaml:"type"`
@@ -26,20 +32,24 @@ type Alert struct {
 	// FailureThreshold is the number of failures in a row needed before triggering the alert
 	FailureThreshold int `yaml:"failure-threshold"`
 
+	// SuccessThreshold defines how many successful executions must happen in a row before an ongoing incident is marked as resolved
+	SuccessThreshold int `yaml:"success-threshold"`
+
 	// Description of the alert. Will be included in the alert sent.
 	//
 	// This is a pointer, because it is populated by YAML and we need to know whether it was explicitly set to a value
 	// or not for provider.ParseWithDefaultAlert to work.
-	Description *string `yaml:"description"`
+	Description *string `yaml:"description,omitempty"`
 
 	// SendOnResolved defines whether to send a second notification when the issue has been resolved
 	//
 	// This is a pointer, because it is populated by YAML and we need to know whether it was explicitly set to a value
 	// or not for provider.ParseWithDefaultAlert to work. Use Alert.IsSendingOnResolved() for a non-pointer
-	SendOnResolved *bool `yaml:"send-on-resolved"`
+	SendOnResolved *bool `yaml:"send-on-resolved,omitempty"`
 
-	// SuccessThreshold defines how many successful executions must happen in a row before an ongoing incident is marked as resolved
+	// ProviderOverride is an optional field that can be used to override the provider's configuration
-	SuccessThreshold int `yaml:"success-threshold"`
+	// It is freeform so that it can be used for any provider-specific configuration.
+	ProviderOverride map[string]any `yaml:"provider-override,omitempty"`
 
 	// ResolveKey is an optional field that is used by some providers (i.e. PagerDuty's dedup_key) to resolve
 	// ongoing/triggered incidents
@@ -71,7 +81,7 @@ func (alert *Alert) ValidateAndSetDefaults() error {
 }
 
 // GetDescription retrieves the description of the alert
-func (alert Alert) GetDescription() string {
+func (alert *Alert) GetDescription() string {
 	if alert.Description == nil {
 		return ""
 	}
@@ -80,7 +90,7 @@ func (alert Alert) GetDescription() string {
 
 // IsEnabled returns whether an alert is enabled or not
 // Returns true if not set
-func (alert Alert) IsEnabled() bool {
+func (alert *Alert) IsEnabled() bool {
 	if alert.Enabled == nil {
 		return true
 	}
@@ -88,9 +98,31 @@ func (alert Alert) IsEnabled() bool {
 }
 
 // IsSendingOnResolved returns whether an alert is sending on resolve or not
-func (alert Alert) IsSendingOnResolved() bool {
+func (alert *Alert) IsSendingOnResolved() bool {
 	if alert.SendOnResolved == nil {
 		return false
 	}
 	return *alert.SendOnResolved
 }
+
+// Checksum returns a checksum of the alert
+// Used to determine which persisted triggered alert should be deleted on application start
+func (alert *Alert) Checksum() string {
+	hash := sha256.New()
+	hash.Write([]byte(string(alert.Type) + "_" +
+		strconv.FormatBool(alert.IsEnabled()) + "_" +
+		strconv.FormatBool(alert.IsSendingOnResolved()) + "_" +
+		strconv.Itoa(alert.SuccessThreshold) + "_" +
+		strconv.Itoa(alert.FailureThreshold) + "_" +
+		alert.GetDescription()),
+	)
+	return hex.EncodeToString(hash.Sum(nil))
+}
+
+func (alert *Alert) ProviderOverrideAsBytes() []byte {
+	yamlBytes, err := yaml.Marshal(alert.ProviderOverride)
+	if err != nil {
+		logr.Warnf("[alert.ProviderOverrideAsBytes] Failed to marshal alert override of type=%s as bytes: %v", alert.Type, err)
+	}
+	return yamlBytes
+}

alerting/alert/alert_test.go

@@ -1,6 +1,7 @@
 package alert
 
 import (
+	"errors"
 	"testing"
 )
 
@@ -38,7 +39,7 @@ func TestAlert_ValidateAndSetDefaults(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.name, func(t *testing.T) {
-			if err := scenario.alert.ValidateAndSetDefaults(); err != scenario.expectedError {
+			if err := scenario.alert.ValidateAndSetDefaults(); !errors.Is(err, scenario.expectedError) {
 				t.Errorf("expected error %v, got %v", scenario.expectedError, err)
 			}
 			if scenario.alert.SuccessThreshold != scenario.expectedSuccessThreshold {
@@ -52,34 +53,140 @@ func TestAlert_ValidateAndSetDefaults(t *testing.T) {
 }
 
 func TestAlert_IsEnabled(t *testing.T) {
-	if !(Alert{Enabled: nil}).IsEnabled() {
+	if !(&Alert{Enabled: nil}).IsEnabled() {
 		t.Error("alert.IsEnabled() should've returned true, because Enabled was set to nil")
 	}
-	if value := false; (Alert{Enabled: &value}).IsEnabled() {
+	if value := false; (&Alert{Enabled: &value}).IsEnabled() {
 		t.Error("alert.IsEnabled() should've returned false, because Enabled was set to false")
 	}
-	if value := true; !(Alert{Enabled: &value}).IsEnabled() {
+	if value := true; !(&Alert{Enabled: &value}).IsEnabled() {
 		t.Error("alert.IsEnabled() should've returned true, because Enabled was set to true")
 	}
 }
 
 func TestAlert_GetDescription(t *testing.T) {
-	if (Alert{Description: nil}).GetDescription() != "" {
+	if (&Alert{Description: nil}).GetDescription() != "" {
 		t.Error("alert.GetDescription() should've returned an empty string, because Description was set to nil")
 	}
-	if value := "description"; (Alert{Description: &value}).GetDescription() != value {
+	if value := "description"; (&Alert{Description: &value}).GetDescription() != value {
 		t.Error("alert.GetDescription() should've returned false, because Description was set to 'description'")
 	}
 }
 
 func TestAlert_IsSendingOnResolved(t *testing.T) {
-	if (Alert{SendOnResolved: nil}).IsSendingOnResolved() {
+	if (&Alert{SendOnResolved: nil}).IsSendingOnResolved() {
 		t.Error("alert.IsSendingOnResolved() should've returned false, because SendOnResolved was set to nil")
 	}
-	if value := false; (Alert{SendOnResolved: &value}).IsSendingOnResolved() {
+	if value := false; (&Alert{SendOnResolved: &value}).IsSendingOnResolved() {
 		t.Error("alert.IsSendingOnResolved() should've returned false, because SendOnResolved was set to false")
 	}
-	if value := true; !(Alert{SendOnResolved: &value}).IsSendingOnResolved() {
+	if value := true; !(&Alert{SendOnResolved: &value}).IsSendingOnResolved() {
 		t.Error("alert.IsSendingOnResolved() should've returned true, because SendOnResolved was set to true")
 	}
 }
+
+func TestAlert_Checksum(t *testing.T) {
+	description1, description2 := "a", "b"
+	yes, no := true, false
+	scenarios := []struct {
+		name     string
+		alert    Alert
+		expected string
+	}{
+		{
+			name: "barebone",
+			alert: Alert{
+				Type: TypeDiscord,
+			},
+			expected: "fed0580e44ed5701dbba73afa1f14b2c53ca5a7b8067a860441c212916057fe3",
+		},
+		{
+			name: "with-description-1",
+			alert: Alert{
+				Type:        TypeDiscord,
+				Description: &description1,
+			},
+			expected: "005f407ebe506e74a4aeb46f74c28b376debead7011e1b085da3840f72ba9707",
+		},
+		{
+			name: "with-description-2",
+			alert: Alert{
+				Type:        TypeDiscord,
+				Description: &description2,
+			},
+			expected: "3c2c4a9570cdc614006993c21f79a860a7f5afea10cf70d1a79d3c49342ef2c8",
+		},
+		{
+			name: "with-description-2-and-enabled-false",
+			alert: Alert{
+				Type:        TypeDiscord,
+				Enabled:     &no,
+				Description: &description2,
+			},
+			expected: "837945c2b4cd5e961db3e63e10c348d4f1c3446ba68cf5a48e35a1ae22cf0c22",
+		},
+		{
+			name: "with-description-2-and-enabled-true",
+			alert: Alert{
+				Type:        TypeDiscord,
+				Enabled:     &yes, // it defaults to true if not set, but just to make sure
+				Description: &description2,
+			},
+			expected: "3c2c4a9570cdc614006993c21f79a860a7f5afea10cf70d1a79d3c49342ef2c8",
+		},
+		{
+			name: "with-description-2-and-enabled-true-and-send-on-resolved-true",
+			alert: Alert{
+				Type:           TypeDiscord,
+				Enabled:        &yes,
+				SendOnResolved: &yes,
+				Description:    &description2,
+			},
+			expected: "bf1436995a880eb4a352c74c5dfee1f1b5ff6b9fc55aef9bf411b3631adfd80c",
+		},
+		{
+			name: "with-description-2-and-failure-threshold-7",
+			alert: Alert{
+				Type:             TypeSlack,
+				FailureThreshold: 7,
+				Description:      &description2,
+			},
+			expected: "8bd479e18bda393d4c924f5a0d962e825002168dedaa88b445e435db7bacffd3",
+		},
+		{
+			name: "with-description-2-and-failure-threshold-9",
+			alert: Alert{
+				Type:             TypeSlack,
+				FailureThreshold: 9,
+				Description:      &description2,
+			},
+			expected: "5abdfce5236e344996d264d526e769c07cb0d3d329a999769a1ff84b157ca6f1",
+		},
+		{
+			name: "with-description-2-and-success-threshold-5",
+			alert: Alert{
+				Type:             TypeSlack,
+				SuccessThreshold: 7,
+				Description:      &description2,
+			},
+			expected: "c0000e73626b80e212cfc24830de7094568f648e37f3e16f9e68c7f8ef75c34c",
+		},
+		{
+			name: "with-description-2-and-success-threshold-1",
+			alert: Alert{
+				Type:             TypeSlack,
+				SuccessThreshold: 1,
+				Description:      &description2,
+			},
+			expected: "5c28963b3a76104cfa4a0d79c89dd29ec596c8cfa4b1af210ec83d6d41587b5f",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			scenario.alert.ValidateAndSetDefaults()
+			if checksum := scenario.alert.Checksum(); checksum != scenario.expected {
+				t.Errorf("expected checksum %v, got %v", scenario.expected, checksum)
+			}
+		})
+	}
+}

alerting/alert/type.go

@@ -5,6 +5,9 @@ package alert
 type Type string
 
 const (
+	// TypeAWSSES is the Type for the awsses alerting provider
+	TypeAWSSES Type = "aws-ses"
+
 	// TypeCustom is the Type for the custom alerting provider
 	TypeCustom Type = "custom"
 
@@ -17,9 +20,21 @@ const (
 	// TypeGitHub is the Type for the github alerting provider
 	TypeGitHub Type = "github"
 
+	// TypeGitLab is the Type for the gitlab alerting provider
+	TypeGitLab Type = "gitlab"
+
+	// TypeGitea is the Type for the gitea alerting provider
+	TypeGitea Type = "gitea"
+
 	// TypeGoogleChat is the Type for the googlechat alerting provider
 	TypeGoogleChat Type = "googlechat"
 
+	// TypeGotify is the Type for the gotify alerting provider
+	TypeGotify Type = "gotify"
+
+	// TypeJetBrainsSpace is the Type for the jetbrains alerting provider
+	TypeJetBrainsSpace Type = "jetbrainsspace"
+
 	// TypeMatrix is the Type for the matrix alerting provider
 	TypeMatrix Type = "matrix"
 
@@ -47,9 +62,15 @@ const (
 	// TypeTeams is the Type for the teams alerting provider
 	TypeTeams Type = "teams"
 
+	// TypeTeamsWorkflows is the Type for the teams-workflows alerting provider
+	TypeTeamsWorkflows Type = "teams-workflows"
+
 	// TypeTelegram is the Type for the telegram alerting provider
 	TypeTelegram Type = "telegram"
 
 	// TypeTwilio is the Type for the twilio alerting provider
 	TypeTwilio Type = "twilio"
+
+	// TypeZulip is the Type for the Zulip alerting provider
+	TypeZulip Type = "zulip"
 )

alerting/config.go

@@ -1,17 +1,21 @@
 package alerting
 
 import (
-	"log"
 	"reflect"
 	"strings"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/alerting/provider"
+	"github.com/TwiN/gatus/v5/alerting/provider/awsses"
 	"github.com/TwiN/gatus/v5/alerting/provider/custom"
 	"github.com/TwiN/gatus/v5/alerting/provider/discord"
 	"github.com/TwiN/gatus/v5/alerting/provider/email"
+	"github.com/TwiN/gatus/v5/alerting/provider/gitea"
 	"github.com/TwiN/gatus/v5/alerting/provider/github"
+	"github.com/TwiN/gatus/v5/alerting/provider/gitlab"
 	"github.com/TwiN/gatus/v5/alerting/provider/googlechat"
+	"github.com/TwiN/gatus/v5/alerting/provider/gotify"
+	"github.com/TwiN/gatus/v5/alerting/provider/jetbrainsspace"
 	"github.com/TwiN/gatus/v5/alerting/provider/matrix"
 	"github.com/TwiN/gatus/v5/alerting/provider/mattermost"
 	"github.com/TwiN/gatus/v5/alerting/provider/messagebird"
@@ -21,12 +25,18 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/provider/pushover"
 	"github.com/TwiN/gatus/v5/alerting/provider/slack"
 	"github.com/TwiN/gatus/v5/alerting/provider/teams"
+	"github.com/TwiN/gatus/v5/alerting/provider/teamsworkflows"
 	"github.com/TwiN/gatus/v5/alerting/provider/telegram"
 	"github.com/TwiN/gatus/v5/alerting/provider/twilio"
+	"github.com/TwiN/gatus/v5/alerting/provider/zulip"
+	"github.com/TwiN/logr"
 )
 
 // Config is the configuration for alerting providers
 type Config struct {
+	// AWSSimpleEmailService is the configuration for the aws-ses alerting provider
+	AWSSimpleEmailService *awsses.AlertProvider `yaml:"aws-ses,omitempty"`
+
 	// Custom is the configuration for the custom alerting provider
 	Custom *custom.AlertProvider `yaml:"custom,omitempty"`
 
@@ -39,9 +49,21 @@ type Config struct {
 	// GitHub is the configuration for the github alerting provider
 	GitHub *github.AlertProvider `yaml:"github,omitempty"`
 
+	// GitLab is the configuration for the gitlab alerting provider
+	GitLab *gitlab.AlertProvider `yaml:"gitlab,omitempty"`
+
+	// Gitea is the configuration for the gitea alerting provider
+	Gitea *gitea.AlertProvider `yaml:"gitea,omitempty"`
+
 	// GoogleChat is the configuration for the googlechat alerting provider
 	GoogleChat *googlechat.AlertProvider `yaml:"googlechat,omitempty"`
 
+	// Gotify is the configuration for the gotify alerting provider
+	Gotify *gotify.AlertProvider `yaml:"gotify,omitempty"`
+
+	// JetBrainsSpace is the configuration for the jetbrains space alerting provider
+	JetBrainsSpace *jetbrainsspace.AlertProvider `yaml:"jetbrainsspace,omitempty"`
+
 	// Matrix is the configuration for the matrix alerting provider
 	Matrix *matrix.AlertProvider `yaml:"matrix,omitempty"`
 
@@ -69,11 +91,17 @@ type Config struct {
 	// Teams is the configuration for the teams alerting provider
 	Teams *teams.AlertProvider `yaml:"teams,omitempty"`
 
+	// TeamsWorkflows is the configuration for the teams alerting provider using the new Workflow App Webhook Connector
+	TeamsWorkflows *teamsworkflows.AlertProvider `yaml:"teams-workflows,omitempty"`
+
 	// Telegram is the configuration for the telegram alerting provider
 	Telegram *telegram.AlertProvider `yaml:"telegram,omitempty"`
 
 	// Twilio is the configuration for the twilio alerting provider
 	Twilio *twilio.AlertProvider `yaml:"twilio,omitempty"`
+
+	// Zulip is the configuration for the zulip alerting provider
+	Zulip *zulip.AlertProvider `yaml:"zulip,omitempty"`
 }
 
 // GetAlertingProviderByAlertType returns an provider.AlertProvider by its corresponding alert.Type
@@ -81,7 +109,8 @@ func (config *Config) GetAlertingProviderByAlertType(alertType alert.Type) provi
 	entityType := reflect.TypeOf(config).Elem()
 	for i := 0; i < entityType.NumField(); i++ {
 		field := entityType.Field(i)
-		if strings.ToLower(field.Name) == string(alertType) {
+		tag := strings.Split(field.Tag.Get("yaml"), ",")[0]
+		if tag == string(alertType) {
 			fieldValue := reflect.ValueOf(config).Elem().Field(i)
 			if fieldValue.IsNil() {
 				return nil
@@ -89,7 +118,7 @@ func (config *Config) GetAlertingProviderByAlertType(alertType alert.Type) provi
 			return fieldValue.Interface().(provider.AlertProvider)
 		}
 	}
-	log.Printf("[alerting][GetAlertingProviderByAlertType] No alerting provider found for alert type %s", alertType)
+	logr.Infof("[alerting.GetAlertingProviderByAlertType] No alerting provider found for alert type %s", alertType)
 	return nil
 }
 

alerting/provider/awsses/awsses.go

@@ -0,0 +1,228 @@
+package awsses
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/logr"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awserr"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ses"
+	"gopkg.in/yaml.v3"
+)
+
+const (
+	CharSet = "UTF-8"
+)
+
+var (
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+	ErrMissingFromOrToFields  = errors.New("from and to fields are required")
+	ErrInvalidAWSAuthConfig   = errors.New("either both or neither of access-key-id and secret-access-key must be specified")
+)
+
+type Config struct {
+	AccessKeyID     string `yaml:"access-key-id"`
+	SecretAccessKey string `yaml:"secret-access-key"`
+	Region          string `yaml:"region"`
+
+	From string `yaml:"from"`
+	To   string `yaml:"to"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.From) == 0 || len(cfg.To) == 0 {
+		return ErrMissingFromOrToFields
+	}
+	if !((len(cfg.AccessKeyID) == 0 && len(cfg.SecretAccessKey) == 0) || (len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0)) {
+		// if both AccessKeyID and SecretAccessKey are specified, we'll use these to authenticate,
+		// otherwise if neither are specified, then we'll fall back on IAM authentication.
+		return ErrInvalidAWSAuthConfig
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.AccessKeyID) > 0 {
+		cfg.AccessKeyID = override.AccessKeyID
+	}
+	if len(override.SecretAccessKey) > 0 {
+		cfg.SecretAccessKey = override.SecretAccessKey
+	}
+	if len(override.Region) > 0 {
+		cfg.Region = override.Region
+	}
+	if len(override.From) > 0 {
+		cfg.From = override.From
+	}
+	if len(override.To) > 0 {
+		cfg.To = override.To
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using AWS Simple Email Service
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.To) == 0 {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	awsSession, err := provider.createSession(cfg)
+	if err != nil {
+		return err
+	}
+	svc := ses.New(awsSession)
+	subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
+	emails := strings.Split(cfg.To, ",")
+
+	input := &ses.SendEmailInput{
+		Destination: &ses.Destination{
+			ToAddresses: aws.StringSlice(emails),
+		},
+		Message: &ses.Message{
+			Body: &ses.Body{
+				Text: &ses.Content{
+					Charset: aws.String(CharSet),
+					Data:    aws.String(body),
+				},
+			},
+			Subject: &ses.Content{
+				Charset: aws.String(CharSet),
+				Data:    aws.String(subject),
+			},
+		},
+		Source: aws.String(cfg.From),
+	}
+	if _, err = svc.SendEmail(input); err != nil {
+		if aerr, ok := err.(awserr.Error); ok {
+			switch aerr.Code() {
+			case ses.ErrCodeMessageRejected:
+				logr.Error(ses.ErrCodeMessageRejected + ": " + aerr.Error())
+			case ses.ErrCodeMailFromDomainNotVerifiedException:
+				logr.Error(ses.ErrCodeMailFromDomainNotVerifiedException + ": " + aerr.Error())
+			case ses.ErrCodeConfigurationSetDoesNotExistException:
+				logr.Error(ses.ErrCodeConfigurationSetDoesNotExistException + ": " + aerr.Error())
+			default:
+				logr.Error(aerr.Error())
+			}
+		} else {
+			// Print the error, cast err to awserr.Error to get the Code and
+			// Message from an error.
+			logr.Error(err.Error())
+		}
+
+		return err
+	}
+	return nil
+}
+
+func (provider *AlertProvider) createSession(cfg *Config) (*session.Session, error) {
+	awsConfig := &aws.Config{
+		Region: aws.String(cfg.Region),
+	}
+	if len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0 {
+		awsConfig.Credentials = credentials.NewStaticCredentials(cfg.AccessKeyID, cfg.SecretAccessKey, "")
+	}
+	return session.NewSession(awsConfig)
+}
+
+// buildMessageSubjectAndBody builds the message subject and body
+func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) (string, string) {
+	var subject, message string
+	if resolved {
+		subject = fmt.Sprintf("[%s] Alert resolved", ep.DisplayName())
+		message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		subject = fmt.Sprintf("[%s] Alert triggered", ep.DisplayName())
+		message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	var formattedConditionResults string
+	if len(result.ConditionResults) > 0 {
+		formattedConditionResults = "\n\nCondition results:\n"
+		for _, conditionResult := range result.ConditionResults {
+			var prefix string
+			if conditionResult.Success {
+				prefix = "✅"
+			} else {
+				prefix = "❌"
+			}
+			formattedConditionResults += fmt.Sprintf("%s %s\n", prefix, conditionResult.Condition)
+		}
+	}
+	var description string
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		description = "\n\nAlert description: " + alertDescription
+	}
+	return subject, message + description + formattedConditionResults
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/awsses/awsses_test.go

@@ -0,0 +1,250 @@
+package awsses
+
+import (
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{}
+	if err := invalidProvider.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	invalidProviderWithOneKey := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com", AccessKeyID: "1"}}
+	if err := invalidProviderWithOneKey.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+	validProviderWithKeys := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com", AccessKeyID: "1", SecretAccessKey: "1"}}
+	if err := validProviderWithKeys.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{To: "to@example.com"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithInvalidOverrideTo := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{To: ""},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
+		t.Error("provider integration key shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{
+			From: "from@example.com",
+			To:   "to@example.com",
+		},
+		Overrides: []Override{
+			{
+				Config: Config{To: "to@example.com"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name            string
+		Provider        AlertProvider
+		Alert           alert.Alert
+		Resolved        bool
+		ExpectedSubject string
+		ExpectedBody    string
+	}{
+		{
+			Name:            "triggered",
+			Provider:        AlertProvider{},
+			Alert:           alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:        false,
+			ExpectedSubject: "[endpoint-name] Alert triggered",
+			ExpectedBody:    "An alert for endpoint-name has been triggered due to having failed 3 time(s) in a row\n\nAlert description: description-1\n\nCondition results:\n❌ [CONNECTED] == true\n❌ [STATUS] == 200\n",
+		},
+		{
+			Name:            "resolved",
+			Provider:        AlertProvider{},
+			Alert:           alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:        true,
+			ExpectedSubject: "[endpoint-name] Alert resolved",
+			ExpectedBody:    "An alert for endpoint-name has been resolved after passing successfully 5 time(s) in a row\n\nAlert description: description-2\n\nCondition results:\n✅ [CONNECTED] == true\n✅ [STATUS] == 200\n",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			subject, body := scenario.Provider.buildMessageSubjectAndBody(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if subject != scenario.ExpectedSubject {
+				t.Errorf("expected subject to be %s, got %s", scenario.ExpectedSubject, subject)
+			}
+			if body != scenario.ExpectedBody {
+				t.Errorf("expected body to be %s, got %s", scenario.ExpectedBody, body)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_getConfigWithOverrides(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{To: "groupto@example.com"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{To: "groupto@example.com", SecretAccessKey: "wow", AccessKeyID: "noway"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "groupto@example.com", SecretAccessKey: "wow", AccessKeyID: "noway"},
+		},
+		{
+			Name: "provider-with-override-specify-group-but-alert-override-should-override-group-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{From: "from@example.com", To: "groupto@example.com", SecretAccessKey: "sekrit"},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{
+				ProviderOverride: map[string]any{
+					"to":            "alertto@example.com",
+					"access-key-id": 123,
+				},
+			},
+			ExpectedOutput: Config{To: "alertto@example.com", From: "from@example.com", AccessKeyID: "123", SecretAccessKey: "sekrit"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.From != scenario.ExpectedOutput.From {
+				t.Errorf("expected From to be %s, got %s", scenario.ExpectedOutput.From, got.From)
+			}
+			if got.To != scenario.ExpectedOutput.To {
+				t.Errorf("expected To to be %s, got %s", scenario.ExpectedOutput.To, got.To)
+			}
+			if got.AccessKeyID != scenario.ExpectedOutput.AccessKeyID {
+				t.Errorf("expected AccessKeyID to be %s, got %s", scenario.ExpectedOutput.AccessKeyID, got.AccessKeyID)
+			}
+			if got.SecretAccessKey != scenario.ExpectedOutput.SecretAccessKey {
+				t.Errorf("expected SecretAccessKey to be %s, got %s", scenario.ExpectedOutput.SecretAccessKey, got.SecretAccessKey)
+			}
+			if got.Region != scenario.ExpectedOutput.Region {
+				t.Errorf("expected Region to be %s, got %s", scenario.ExpectedOutput.Region, got.Region)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/custom/custom.go

@@ -2,6 +2,7 @@ package custom
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -9,12 +10,15 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
+var (
-// Technically, all alert providers should be reachable using the custom alert provider
+	ErrURLNotSet = errors.New("url not set")
-type AlertProvider struct {
+)
+
+type Config struct {
 	URL          string                       `yaml:"url"`
 	Method       string                       `yaml:"method,omitempty"`
 	Body         string                       `yaml:"body,omitempty"`
@@ -23,64 +27,66 @@ type AlertProvider struct {
 
 	// ClientConfig is the configuration of the client used to communicate with the provider's target
 	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		return ErrURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if len(override.Method) > 0 {
+		cfg.Method = override.Method
+	}
+	if len(override.Body) > 0 {
+		cfg.Body = override.Body
+	}
+	if len(override.Headers) > 0 {
+		cfg.Headers = override.Headers
+	}
+	if len(override.Placeholders) > 0 {
+		cfg.Placeholders = override.Placeholders
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
+// Technically, all alert providers should be reachable using the custom alert provider
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Override is a case under which the default integration is overridden
-func (provider *AlertProvider) IsValid() bool {
+type Override struct {
-	if provider.ClientConfig == nil {
+	Group  string `yaml:"group"`
-		provider.ClientConfig = client.GetDefaultConfig()
+	Config `yaml:",inline"`
-	}
-	return len(provider.URL) > 0 && provider.ClientConfig != nil
 }
 
-// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
+// Validate the provider's configuration
-func (provider *AlertProvider) GetAlertStatePlaceholderValue(resolved bool) string {
+func (provider *AlertProvider) Validate() error {
-	status := "TRIGGERED"
+	return provider.DefaultConfig.Validate()
-	if resolved {
-		status = "RESOLVED"
-	}
-	if _, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
-		if val, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
-			return val
-		}
-	}
-	return status
 }
 
-func (provider *AlertProvider) buildHTTPRequest(endpoint *core.Endpoint, alert *alert.Alert, resolved bool) *http.Request {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	body, url, method := provider.Body, provider.URL, provider.Method
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	if err != nil {
-	url = strings.ReplaceAll(url, "[ALERT_DESCRIPTION]", alert.GetDescription())
+		return err
-	body = strings.ReplaceAll(body, "[ENDPOINT_NAME]", endpoint.Name)
-	url = strings.ReplaceAll(url, "[ENDPOINT_NAME]", endpoint.Name)
-	body = strings.ReplaceAll(body, "[ENDPOINT_GROUP]", endpoint.Group)
-	url = strings.ReplaceAll(url, "[ENDPOINT_GROUP]", endpoint.Group)
-	body = strings.ReplaceAll(body, "[ENDPOINT_URL]", endpoint.URL)
-	url = strings.ReplaceAll(url, "[ENDPOINT_URL]", endpoint.URL)
-	if resolved {
-		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
-		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
-	} else {
-		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
-		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
 	}
-	if len(method) == 0 {
+	request := provider.buildHTTPRequest(cfg, ep, alert, result, resolved)
-		method = http.MethodGet
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
-	}
-	bodyBuffer := bytes.NewBuffer([]byte(body))
-	request, _ := http.NewRequest(method, url, bodyBuffer)
-	for k, v := range provider.Headers {
-		request.Header.Set(k, v)
-	}
-	return request
-}
-
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
-	request := provider.buildHTTPRequest(endpoint, alert, resolved)
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -92,7 +98,82 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 	return err
 }
 
+func (provider *AlertProvider) buildHTTPRequest(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) *http.Request {
+	body, url, method := cfg.Body, cfg.URL, cfg.Method
+	body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	url = strings.ReplaceAll(url, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	body = strings.ReplaceAll(body, "[ENDPOINT_NAME]", ep.Name)
+	url = strings.ReplaceAll(url, "[ENDPOINT_NAME]", ep.Name)
+	body = strings.ReplaceAll(body, "[ENDPOINT_GROUP]", ep.Group)
+	url = strings.ReplaceAll(url, "[ENDPOINT_GROUP]", ep.Group)
+	body = strings.ReplaceAll(body, "[ENDPOINT_URL]", ep.URL)
+	url = strings.ReplaceAll(url, "[ENDPOINT_URL]", ep.URL)
+	body = strings.ReplaceAll(body, "[RESULT_ERRORS]", strings.Join(result.Errors, ","))
+	url = strings.ReplaceAll(url, "[RESULT_ERRORS]", strings.Join(result.Errors, ","))
+	if resolved {
+		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, true))
+		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, true))
+	} else {
+		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, false))
+		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, false))
+	}
+	if len(method) == 0 {
+		method = http.MethodGet
+	}
+	bodyBuffer := bytes.NewBuffer([]byte(body))
+	request, _ := http.NewRequest(method, url, bodyBuffer)
+	for k, v := range cfg.Headers {
+		request.Header.Set(k, v)
+	}
+	return request
+}
+
+// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
+func (provider *AlertProvider) GetAlertStatePlaceholderValue(cfg *Config, resolved bool) string {
+	status := "TRIGGERED"
+	if resolved {
+		status = "RESOLVED"
+	}
+	if _, ok := cfg.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
+		if val, ok := cfg.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
+			return val
+		}
+	}
+	return status
+}
+
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/custom/custom_test.go

@@ -8,28 +8,22 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	t.Run("invalid-provider", func(t *testing.T) {
-		invalidProvider := AlertProvider{URL: ""}
+		invalidProvider := AlertProvider{DefaultConfig: Config{URL: ""}}
-		if invalidProvider.IsValid() {
+		if err := invalidProvider.Validate(); err == nil {
 			t.Error("provider shouldn't have been valid")
 		}
 	})
 	t.Run("valid-provider", func(t *testing.T) {
-		validProvider := AlertProvider{URL: "https://example.com"}
+		validProvider := AlertProvider{DefaultConfig: Config{URL: "https://example.com"}}
-		if validProvider.ClientConfig != nil {
+		if err := validProvider.Validate(); err != nil {
-			t.Error("provider client config should have been nil prior to IsValid() being executed")
-		}
-		if !validProvider.IsValid() {
 			t.Error("provider should've been valid")
 		}
-		if validProvider.ClientConfig == nil {
-			t.Error("provider client config should have been set after IsValid() was executed")
-		}
 	})
 }
 
@@ -47,7 +41,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -57,7 +51,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -67,7 +61,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -77,7 +71,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -90,10 +84,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -111,9 +105,11 @@ func TestAlertProvider_Send(t *testing.T) {
 }
 
 func TestAlertProvider_buildHTTPRequest(t *testing.T) {
-	customAlertProvider := &AlertProvider{
+	alertProvider := &AlertProvider{
-		URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]",
+		DefaultConfig: Config{
-		Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED]",
+			URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED]",
+		},
 	}
 	alertDescription := "alert-description"
 	scenarios := []struct {
@@ -123,13 +119,13 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 		ExpectedBody  string
 	}{
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      true,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=RESOLVED&description=alert-description&url=https://example.com",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,RESOLVED",
 		},
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      false,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=TRIGGERED&description=alert-description&url=https://example.com",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,TRIGGERED",
@@ -137,9 +133,60 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(fmt.Sprintf("resolved-%v-with-default-placeholders", scenario.Resolved), func(t *testing.T) {
-			request := customAlertProvider.buildHTTPRequest(
+			request := alertProvider.buildHTTPRequest(
-				&core.Endpoint{Name: "endpoint-name", Group: "endpoint-group", URL: "https://example.com"},
+				&alertProvider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group", URL: "https://example.com"},
 				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{Errors: []string{}},
+				scenario.Resolved,
+			)
+			if request.URL.String() != scenario.ExpectedURL {
+				t.Error("expected URL to be", scenario.ExpectedURL, "got", request.URL.String())
+			}
+			body, _ := io.ReadAll(request.Body)
+			if string(body) != scenario.ExpectedBody {
+				t.Error("expected body to be", scenario.ExpectedBody, "got", string(body))
+			}
+		})
+	}
+}
+
+func TestAlertProviderWithResultErrors_buildHTTPRequest(t *testing.T) {
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]&error=[RESULT_ERRORS]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED],[RESULT_ERRORS]",
+		},
+	}
+	alertDescription := "alert-description"
+	scenarios := []struct {
+		AlertProvider *AlertProvider
+		Resolved      bool
+		ExpectedURL   string
+		ExpectedBody  string
+		Errors        []string
+	}{
+		{
+			AlertProvider: alertProvider,
+			Resolved:      true,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=RESOLVED&description=alert-description&url=https://example.com&error=",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,RESOLVED,",
+		},
+		{
+			AlertProvider: alertProvider,
+			Resolved:      false,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=TRIGGERED&description=alert-description&url=https://example.com&error=error1,error2",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,TRIGGERED,error1,error2",
+			Errors:        []string{"error1", "error2"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(fmt.Sprintf("resolved-%v-with-default-placeholders-and-result-errors", scenario.Resolved), func(t *testing.T) {
+			request := alertProvider.buildHTTPRequest(
+				&alertProvider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group", URL: "https://example.com"},
+				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{Errors: scenario.Errors},
 				scenario.Resolved,
 			)
 			if request.URL.String() != scenario.ExpectedURL {
@@ -154,14 +201,16 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 }
 
 func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
-	customAlertProvider := &AlertProvider{
+	alertProvider := &AlertProvider{
-		URL:     "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+		DefaultConfig: Config{
-		Body:    "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+			URL:     "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
-		Headers: nil,
+			Body:    "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
-		Placeholders: map[string]map[string]string{
+			Headers: nil,
-			"ALERT_TRIGGERED_OR_RESOLVED": {
+			Placeholders: map[string]map[string]string{
-				"RESOLVED":  "fixed",
+				"ALERT_TRIGGERED_OR_RESOLVED": {
-				"TRIGGERED": "boom",
+					"RESOLVED":  "fixed",
+					"TRIGGERED": "boom",
+				},
 			},
 		},
 	}
@@ -173,13 +222,13 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 		ExpectedBody  string
 	}{
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      true,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=fixed&description=alert-description",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,fixed",
 		},
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      false,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=boom&description=alert-description",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,boom",
@@ -187,9 +236,11 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(fmt.Sprintf("resolved-%v-with-custom-placeholders", scenario.Resolved), func(t *testing.T) {
-			request := customAlertProvider.buildHTTPRequest(
+			request := alertProvider.buildHTTPRequest(
-				&core.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&alertProvider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
 				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{},
 				scenario.Resolved,
 			)
 			if request.URL.String() != scenario.ExpectedURL {
@@ -204,23 +255,141 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 }
 
 func TestAlertProvider_GetAlertStatePlaceholderValueDefaults(t *testing.T) {
-	customAlertProvider := &AlertProvider{
+	alertProvider := &AlertProvider{
-		URL:  "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+		DefaultConfig: Config{
-		Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+			URL:  "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+		},
 	}
-	if customAlertProvider.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
+	if alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, true) != "RESOLVED" {
-		t.Error("expected RESOLVED, got", customAlertProvider.GetAlertStatePlaceholderValue(true))
+		t.Error("expected RESOLVED, got", alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, true))
 	}
-	if customAlertProvider.GetAlertStatePlaceholderValue(false) != "TRIGGERED" {
+	if alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, false) != "TRIGGERED" {
-		t.Error("expected TRIGGERED, got", customAlertProvider.GetAlertStatePlaceholderValue(false))
+		t.Error("expected TRIGGERED, got", alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, false))
 	}
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com", Body: "default-body"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com", Body: "default-body"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com", Headers: map[string]string{"Cache": "true"}},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com", Headers: map[string]string{"Cache": "true"}},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com", Body: "default-body"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com", Body: "group-body"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://group-example.com", Body: "group-body"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"url": "http://alert-example.com", "body": "alert-body"}},
+			ExpectedOutput: Config{URL: "http://alert-example.com", Body: "alert-body"},
+		},
+		{
+			Name: "provider-with-partial-overrides",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{Method: "POST"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"body": "alert-body"}},
+			ExpectedOutput: Config{URL: "http://example.com", Body: "alert-body", Method: "POST"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.URL != scenario.ExpectedOutput.URL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.URL, got.URL)
+			}
+			if got.Body != scenario.ExpectedOutput.Body {
+				t.Errorf("expected body to be %s, got %s", scenario.ExpectedOutput.Body, got.Body)
+			}
+			if got.Headers != nil {
+				for key, value := range scenario.ExpectedOutput.Headers {
+					if got.Headers[key] != value {
+						t.Errorf("expected header %s to be %s, got %s", key, value, got.Headers[key])
+					}
+				}
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/discord/discord.go

@@ -3,18 +3,46 @@ package discord
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL string `yaml:"webhook-url"`
+	Title      string `yaml:"title,omitempty"` // Title of the message that will be sent
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Discord
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -23,30 +51,33 @@ type AlertProvider struct {
 	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
-// Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
+	Group  string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
@@ -72,7 +103,7 @@ type Embed struct {
 	Title       string  `json:"title"`
 	Description string  `json:"description"`
 	Color       int     `json:"color"`
-	Fields      []Field `json:"fields"`
+	Fields      []Field `json:"fields,omitempty"`
 }
 
 type Field struct {
@@ -82,16 +113,17 @@ type Field struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	var message, results string
+	var message string
 	var colorCode int
 	if resolved {
-		message = fmt.Sprintf("An alert for **%s** has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for **%s** has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 		colorCode = 3066993
 	} else {
-		message = fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 		colorCode = 15158332
 	}
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -99,45 +131,69 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		} else {
 			prefix = ":x:"
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = ":\n> " + alertDescription
 	}
-	body, _ := json.Marshal(Body{
+	title := ":helmet_with_white_cross: Gatus"
+	if cfg.Title != "" {
+		title = cfg.Title
+	}
+	body := Body{
 		Content: "",
 		Embeds: []Embed{
 			{
-				Title:       ":helmet_with_white_cross: Gatus",
+				Title:       title,
 				Description: message + description,
 				Color:       colorCode,
-				Fields: []Field{
-					{
-						Name:   "Condition results",
-						Value:  results,
-						Inline: false,
-					},
-				},
 			},
 		},
-	})
-	return body
-}
-
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
 	}
-	return provider.WebhookURL
+	if len(formattedConditionResults) > 0 {
+		body.Embeds[0].Fields = append(body.Embeds[0].Fields, Field{
+			Name:   "Condition results",
+			Value:  formattedConditionResults,
+			Inline: false,
+		})
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/discord/discord_test.go

@@ -7,54 +7,56 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
+				Config: Config{WebhookURL: ""},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{
+			WebhookURL: "http://example.com",
+		},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -63,6 +65,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	defer client.InjectHTTPClient(nil)
 	firstDescription := "description-1"
 	secondDescription := "description-2"
+	title := "provider-title"
 	scenarios := []struct {
 		Name             string
 		Provider         AlertProvider
@@ -73,7 +76,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,7 +86,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -93,7 +96,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -103,7 +106,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -111,15 +114,35 @@ func TestAlertProvider_Send(t *testing.T) {
 			}),
 			ExpectedError: true,
 		},
+		{
+			Name:     "triggered-with-modified-title",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com", Title: title}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-with-webhook-override",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3, ProviderOverride: map[string]any{"webhook-url": "http://example01.com"}},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -139,10 +162,12 @@ func TestAlertProvider_Send(t *testing.T) {
 func TestAlertProvider_buildRequestBody(t *testing.T) {
 	firstDescription := "description-1"
 	secondDescription := "description-2"
+	title := "provider-title"
 	scenarios := []struct {
 		Name         string
 		Provider     AlertProvider
 		Alert        alert.Alert
+		NoConditions bool
 		Resolved     bool
 		ExpectedBody string
 	}{
@@ -160,18 +185,38 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 			Resolved:     true,
 			ExpectedBody: "{\"content\":\"\",\"embeds\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"description\":\"An alert for **endpoint-name** has been resolved after passing successfully 5 time(s) in a row:\\n\\u003e description-2\",\"color\":3066993,\"fields\":[{\"name\":\"Condition results\",\"value\":\":white_check_mark: - `[CONNECTED] == true`\\n:white_check_mark: - `[STATUS] == 200`\\n:white_check_mark: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
 		},
+		{
+			Name:         "triggered-with-modified-title",
+			Provider:     AlertProvider{DefaultConfig: Config{Title: title}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"content\":\"\",\"embeds\":[{\"title\":\"provider-title\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332,\"fields\":[{\"name\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n:x: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
+		},
+		{
+			Name:         "triggered-with-no-conditions",
+			NoConditions: true,
+			Provider:     AlertProvider{DefaultConfig: Config{Title: title}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"content\":\"\",\"embeds\":[{\"title\":\"provider-title\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332}]}",
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					{Condition: "[BODY] != \"\"", Success: scenario.Resolved},
+				}
+			}
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: conditionResults,
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-						{Condition: "[BODY] != \"\"", Success: scenario.Resolved},
-					},
 				},
 				scenario.Resolved,
 			)
@@ -187,72 +232,100 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getWebhookURLForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/email/email.go

@@ -1,17 +1,27 @@
 package email
 
 import (
+	"crypto/tls"
+	"errors"
 	"fmt"
 	"math"
 	"strings"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	gomail "gopkg.in/mail.v2"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using SMTP
+var (
-type AlertProvider struct {
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+	ErrMissingFromOrToFields  = errors.New("from and to fields are required")
+	ErrInvalidPort            = errors.New("port must be between 1 and 65535 inclusively")
+	ErrMissingHost            = errors.New("host is required")
+)
+
+type Config struct {
 	From     string `yaml:"from"`
 	Username string `yaml:"username"`
 	Password string `yaml:"password"`
@@ -19,6 +29,51 @@ type AlertProvider struct {
 	Port     int    `yaml:"port"`
 	To       string `yaml:"to"`
 
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.From) == 0 || len(cfg.To) == 0 {
+		return ErrMissingFromOrToFields
+	}
+	if cfg.Port < 1 || cfg.Port > math.MaxUint16 {
+		return ErrInvalidPort
+	}
+	if len(cfg.Host) == 0 {
+		return ErrMissingHost
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.From) > 0 {
+		cfg.From = override.From
+	}
+	if len(override.Username) > 0 {
+		cfg.Username = override.Username
+	}
+	if len(override.Password) > 0 {
+		cfg.Password = override.Password
+	}
+	if len(override.Host) > 0 {
+		cfg.Host = override.Host
+	}
+	if override.Port > 0 {
+		cfg.Port = override.Port
+	}
+	if len(override.To) > 0 {
+		cfg.To = override.To
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using SMTP
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 
@@ -28,82 +83,124 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group string `yaml:"group"`
+	Group  string `yaml:"group"`
-	To    string `yaml:"to"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.To) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-
+	return provider.DefaultConfig.Validate()
-	return len(provider.From) > 0 && len(provider.Password) > 0 && len(provider.Host) > 0 && len(provider.To) > 0 && provider.Port > 0 && provider.Port < math.MaxUint16
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	var username string
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	if len(provider.Username) > 0 {
+	if err != nil {
-		username = provider.Username
+		return err
-	} else {
-		username = provider.From
 	}
-	subject, body := provider.buildMessageSubjectAndBody(endpoint, alert, result, resolved)
+	var username string
+	if len(cfg.Username) > 0 {
+		username = cfg.Username
+	} else {
+		username = cfg.From
+	}
+	subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
 	m := gomail.NewMessage()
-	m.SetHeader("From", provider.From)
+	m.SetHeader("From", cfg.From)
-	m.SetHeader("To", strings.Split(provider.getToForGroup(endpoint.Group), ",")...)
+	m.SetHeader("To", strings.Split(cfg.To, ",")...)
 	m.SetHeader("Subject", subject)
 	m.SetBody("text/plain", body)
-	d := gomail.NewDialer(provider.Host, provider.Port, username, provider.Password)
+	var d *gomail.Dialer
+	if len(cfg.Password) == 0 {
+		// Get the domain in the From address
+		localName := "localhost"
+		fromParts := strings.Split(cfg.From, `@`)
+		if len(fromParts) == 2 {
+			localName = fromParts[1]
+		}
+		// Create a dialer with no authentication
+		d = &gomail.Dialer{Host: cfg.Host, Port: cfg.Port, LocalName: localName}
+	} else {
+		// Create an authenticated dialer
+		d = gomail.NewDialer(cfg.Host, cfg.Port, username, cfg.Password)
+	}
+	if cfg.ClientConfig != nil && cfg.ClientConfig.Insecure {
+		d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
+	}
 	return d.DialAndSend(m)
 }
 
 // buildMessageSubjectAndBody builds the message subject and body
-func (provider *AlertProvider) buildMessageSubjectAndBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) (string, string) {
+func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) (string, string) {
-	var subject, message, results string
+	var subject, message string
 	if resolved {
-		subject = fmt.Sprintf("[%s] Alert resolved", endpoint.DisplayName())
+		subject = fmt.Sprintf("[%s] Alert resolved", ep.DisplayName())
-		message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 	} else {
-		subject = fmt.Sprintf("[%s] Alert triggered", endpoint.DisplayName())
+		subject = fmt.Sprintf("[%s] Alert triggered", ep.DisplayName())
-		message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 	}
-	for _, conditionResult := range result.ConditionResults {
+	var formattedConditionResults string
-		var prefix string
+	if len(result.ConditionResults) > 0 {
-		if conditionResult.Success {
+		formattedConditionResults = "\n\nCondition results:\n"
-			prefix = "✅"
+		for _, conditionResult := range result.ConditionResults {
-		} else {
+			var prefix string
-			prefix = "❌"
+			if conditionResult.Success {
+				prefix = "✅"
+			} else {
+				prefix = "❌"
+			}
+			formattedConditionResults += fmt.Sprintf("%s %s\n", prefix, conditionResult.Condition)
 		}
-		results += fmt.Sprintf("%s %s\n", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = "\n\nAlert description: " + alertDescription
 	}
-	return subject, message + description + "\n\nCondition results:\n" + results
+	return subject, message + description + formattedConditionResults
-}
-
-// getToForGroup returns the appropriate email integration to for a given group
-func (provider *AlertProvider) getToForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.To
-			}
-		}
-	}
-	return provider.To
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/email/email_test.go

@@ -4,57 +4,66 @@ import (
 	"testing"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{From: "from@example.com", Password: "password", Host: "smtp.gmail.com", Port: 587, To: "to@example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Password: "password", Host: "smtp.gmail.com", Port: 587, To: "to@example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithNoCredentials(t *testing.T) {
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Host: "smtp-relay.gmail.com", Port: 587, To: "to@example.com"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
+				Config: Config{To: "to@example.com"},
-				Group: "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "",
+				Config: Config{To: ""},
-				Group: "group",
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		From:     "from@example.com",
+		DefaultConfig: Config{
-		Password: "password",
+			From:     "from@example.com",
-		Host:     "smtp.gmail.com",
+			Password: "password",
-		Port:     587,
+			Host:     "smtp.gmail.com",
-		To:       "to@example.com",
+			Port:     587,
+			To:       "to@example.com",
+		},
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
+				Config: Config{To: "to@example.com"},
-				Group: "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -90,10 +99,10 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			subject, body := scenario.Provider.buildMessageSubjectAndBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -111,72 +120,112 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getToForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
-				Overrides: nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
-				Overrides: nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 				Overrides: []Override{
 					{
-						Group: "group",
+						Group:  "group",
-						To:    "to01@example.com",
+						Config: Config{To: "to01@example.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 				Overrides: []Override{
 					{
-						Group: "group",
+						Group:  "group",
-						To:    "to01@example.com",
+						Config: Config{To: "group-to@example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to01@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "group-to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{To: "group-to@example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"to": "alert-to@example.com", "host": "smtp.example.com", "port": 588, "password": "hunter2"}},
+			ExpectedOutput: Config{From: "from@example.com", To: "alert-to@example.com", Host: "smtp.example.com", Port: 588, Password: "hunter2"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getToForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.From != scenario.ExpectedOutput.From {
+				t.Errorf("expected from to be %s, got %s", scenario.ExpectedOutput.From, got.From)
+			}
+			if got.To != scenario.ExpectedOutput.To {
+				t.Errorf("expected to be %s, got %s", scenario.ExpectedOutput.To, got.To)
+			}
+			if got.Host != scenario.ExpectedOutput.Host {
+				t.Errorf("expected host to be %s, got %s", scenario.ExpectedOutput.Host, got.Host)
+			}
+			if got.Port != scenario.ExpectedOutput.Port {
+				t.Errorf("expected port to be %d, got %d", scenario.ExpectedOutput.Port, got.Port)
+			}
+			if got.Password != scenario.ExpectedOutput.Password {
+				t.Errorf("expected password to be %s, got %s", scenario.ExpectedOutput.Password, got.Password)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/gitea/gitea.go

@@ -0,0 +1,217 @@
+package gitea
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrRepositoryURLNotSet  = errors.New("repository-url not set")
+	ErrInvalidRepositoryURL = errors.New("invalid repository-url")
+	ErrTokenNotSet          = errors.New("token not set")
+)
+
+type Config struct {
+	RepositoryURL string   `yaml:"repository-url"`      // The URL of the Gitea repository to create issues in
+	Token         string   `yaml:"token"`               // Token requires at least RW on issues and RO on metadata
+	Assignees     []string `yaml:"assignees,omitempty"` // Assignees is a list of users to assign the issue to
+
+	username        string
+	repositoryOwner string
+	repositoryName  string
+	giteaClient     *gitea.Client
+
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.RepositoryURL) == 0 {
+		return ErrRepositoryURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	// Validate format of the repository URL
+	repositoryURL, err := url.Parse(cfg.RepositoryURL)
+	if err != nil {
+		return err
+	}
+	baseURL := repositoryURL.Scheme + "://" + repositoryURL.Host
+	pathParts := strings.Split(repositoryURL.Path, "/")
+	if len(pathParts) != 3 {
+		return ErrInvalidRepositoryURL
+	}
+	if cfg.repositoryOwner == pathParts[1] && cfg.repositoryName == pathParts[2] && cfg.giteaClient != nil {
+		// Already validated, let's skip the rest of the validation to avoid unnecessary API calls
+		return nil
+	}
+	cfg.repositoryOwner = pathParts[1]
+	cfg.repositoryName = pathParts[2]
+	opts := []gitea.ClientOption{
+		gitea.SetToken(cfg.Token),
+	}
+	if cfg.ClientConfig != nil && cfg.ClientConfig.Insecure {
+		// add new http client for skip verify
+		httpClient := &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+			},
+		}
+		opts = append(opts, gitea.SetHTTPClient(httpClient))
+	}
+	cfg.giteaClient, err = gitea.NewClient(baseURL, opts...)
+	if err != nil {
+		return err
+	}
+	user, _, err := cfg.giteaClient.GetMyUserInfo()
+	if err != nil {
+		return err
+	}
+	cfg.username = user.UserName
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.RepositoryURL) > 0 {
+		cfg.RepositoryURL = override.RepositoryURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.Assignees) > 0 {
+		cfg.Assignees = override.Assignees
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Discord
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
+}
+
+// Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
+// or closes the relevant issue(s) if the resolved parameter passed is true.
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	title := "alert(gatus): " + ep.DisplayName()
+	if !resolved {
+		_, _, err = cfg.giteaClient.CreateIssue(
+			cfg.repositoryOwner,
+			cfg.repositoryName,
+			gitea.CreateIssueOption{
+				Title:     title,
+				Body:      provider.buildIssueBody(ep, alert, result),
+				Assignees: cfg.Assignees,
+			},
+		)
+		if err != nil {
+			return fmt.Errorf("failed to create issue: %w", err)
+		}
+		return nil
+	}
+	issues, _, err := cfg.giteaClient.ListRepoIssues(
+		cfg.repositoryOwner,
+		cfg.repositoryName,
+		gitea.ListIssueOption{
+			State:     gitea.StateOpen,
+			CreatedBy: cfg.username,
+			ListOptions: gitea.ListOptions{
+				Page: 100,
+			},
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("failed to list issues: %w", err)
+	}
+	for _, issue := range issues {
+		if issue.Title == title {
+			stateClosed := gitea.StateClosed
+			_, _, err = cfg.giteaClient.EditIssue(
+				cfg.repositoryOwner,
+				cfg.repositoryName,
+				issue.ID,
+				gitea.EditIssueOption{
+					State: &stateClosed,
+				},
+			)
+			if err != nil {
+				return fmt.Errorf("failed to close issue: %w", err)
+			}
+		}
+	}
+	return nil
+}
+
+// buildIssueBody builds the body of the issue
+func (provider *AlertProvider) buildIssueBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result) string {
+	var formattedConditionResults string
+	if len(result.ConditionResults) > 0 {
+		formattedConditionResults = "\n\n## Condition results\n"
+		for _, conditionResult := range result.ConditionResults {
+			var prefix string
+			if conditionResult.Success {
+				prefix = ":white_check_mark:"
+			} else {
+				prefix = ":x:"
+			}
+			formattedConditionResults += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
+		}
+	}
+	var description string
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		description = ":\n> " + alertDescription
+	}
+	message := fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	return message + description + formattedConditionResults
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gitea/gitea_test.go

@@ -0,0 +1,229 @@
+package gitea
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		Name          string
+		Provider      AlertProvider
+		ExpectedError bool
+	}{
+		{
+			Name:          "invalid",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "", Token: ""}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "invalid-token",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "missing-repository-name",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN", Token: "12345"}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "enterprise-client",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.example.com/TwiN/test", Token: "12345"}},
+			ExpectedError: false,
+		},
+		{
+			Name:          "invalid-url",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "gitea.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			err := scenario.Provider.Validate()
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:          "triggered-error",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      false,
+			ExpectedError: true,
+		},
+		{
+			Name:          "resolved-error",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      true,
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+			cfg.giteaClient, _ = gitea.NewClient("https://gitea.com")
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err = scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	scenarios := []struct {
+		Name         string
+		Endpoint     endpoint.Endpoint
+		Provider     AlertProvider
+		Alert        alert.Alert
+		NoConditions bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 3},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\n> description-1\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
+		},
+		{
+			Name:         "triggered-with-no-description",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{FailureThreshold: 10},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
+		},
+		{
+			Name:         "triggered-with-no-conditions",
+			NoConditions: true,
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 10},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row:\n> description-1",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: true},
+					{Condition: "[STATUS] == 200", Success: false},
+				}
+			}
+			body := scenario.Provider.buildIssueBody(
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{ConditionResults: conditionResults},
+			)
+			if strings.TrimSpace(body) != strings.TrimSpace(scenario.ExpectedBody) {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://gitea.com/TwiN/alert-test", "token": "54321", "assignees": []string{"TwiN"}}},
+			ExpectedOutput: Config{RepositoryURL: "https://gitea.com/TwiN/alert-test", Token: "54321", Assignees: []string{"TwiN"}},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.RepositoryURL != scenario.ExpectedOutput.RepositoryURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.RepositoryURL, got.RepositoryURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if len(got.Assignees) != len(scenario.ExpectedOutput.Assignees) {
+				t.Errorf("expected %d assignees, got %d", len(scenario.ExpectedOutput.Assignees), len(got.Assignees))
+			}
+			for i, assignee := range got.Assignees {
+				if assignee != scenario.ExpectedOutput.Assignees[i] {
+					t.Errorf("expected assignee %s, got %s", scenario.ExpectedOutput.Assignees[i], assignee)
+				}
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil && !strings.Contains(err.Error(), "user does not exist") {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/github/github.go

@@ -2,88 +2,124 @@ package github
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/url"
 	"strings"
 	"time"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/google/go-github/v48/github"
 	"golang.org/x/oauth2"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Discord
+var (
-type AlertProvider struct {
+	ErrRepositoryURLNotSet  = errors.New("repository-url not set")
+	ErrInvalidRepositoryURL = errors.New("invalid repository-url")
+	ErrTokenNotSet          = errors.New("token not set")
+)
+
+type Config struct {
 	RepositoryURL string `yaml:"repository-url"` // The URL of the GitHub repository to create issues in
 	Token         string `yaml:"token"`          // Token requires at least RW on issues and RO on metadata
 
-	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
 	username        string
 	repositoryOwner string
 	repositoryName  string
 	githubClient    *github.Client
 }
 
-// IsValid returns whether the provider's configuration is valid
+func (cfg *Config) Validate() error {
-func (provider *AlertProvider) IsValid() bool {
+	if len(cfg.RepositoryURL) == 0 {
-	if len(provider.Token) == 0 || len(provider.RepositoryURL) == 0 {
+		return ErrRepositoryURLNotSet
-		return false
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
 	}
 	// Validate format of the repository URL
-	repositoryURL, err := url.Parse(provider.RepositoryURL)
+	repositoryURL, err := url.Parse(cfg.RepositoryURL)
 	if err != nil {
-		return false
+		return err
 	}
 	baseURL := repositoryURL.Scheme + "://" + repositoryURL.Host
 	pathParts := strings.Split(repositoryURL.Path, "/")
 	if len(pathParts) != 3 {
-		return false
+		return ErrInvalidRepositoryURL
 	}
-	provider.repositoryOwner = pathParts[1]
+	if cfg.repositoryOwner == pathParts[1] && cfg.repositoryName == pathParts[2] && cfg.githubClient != nil {
-	provider.repositoryName = pathParts[2]
+		// Already validated, let's skip the rest of the validation to avoid unnecessary API calls
+		return nil
+	}
+	cfg.repositoryOwner = pathParts[1]
+	cfg.repositoryName = pathParts[2]
 	// Create oauth2 HTTP client with GitHub token
 	httpClientWithStaticTokenSource := oauth2.NewClient(context.Background(), oauth2.StaticTokenSource(&oauth2.Token{
-		AccessToken: provider.Token,
+		AccessToken: cfg.Token,
 	}))
 	// Create GitHub client
 	if baseURL == "https://github.com" {
-		provider.githubClient = github.NewClient(httpClientWithStaticTokenSource)
+		cfg.githubClient = github.NewClient(httpClientWithStaticTokenSource)
 	} else {
-		provider.githubClient, err = github.NewEnterpriseClient(baseURL, baseURL, httpClientWithStaticTokenSource)
+		cfg.githubClient, err = github.NewEnterpriseClient(baseURL, baseURL, httpClientWithStaticTokenSource)
 		if err != nil {
-			return false
+			return fmt.Errorf("failed to create enterprise GitHub client: %w", err)
 		}
 	}
 	// Retrieve the username once to validate that the token is valid
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
-	user, _, err := provider.githubClient.Users.Get(ctx, "")
+	user, _, err := cfg.githubClient.Users.Get(ctx, "")
 	if err != nil {
-		return false
+		return fmt.Errorf("failed to retrieve GitHub user: %w", err)
 	}
-	provider.username = *user.Login
+	cfg.username = *user.Login
-	return true
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.RepositoryURL) > 0 {
+		cfg.RepositoryURL = override.RepositoryURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Discord
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 // Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
 // or closes the relevant issue(s) if the resolved parameter passed is true.
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	title := "alert(gatus): " + endpoint.DisplayName()
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	title := "alert(gatus): " + ep.DisplayName()
 	if !resolved {
-		_, _, err := provider.githubClient.Issues.Create(context.Background(), provider.repositoryOwner, provider.repositoryName, &github.IssueRequest{
+		_, _, err := cfg.githubClient.Issues.Create(context.Background(), cfg.repositoryOwner, cfg.repositoryName, &github.IssueRequest{
 			Title: github.String(title),
-			Body:  github.String(provider.buildIssueBody(endpoint, alert, result)),
+			Body:  github.String(provider.buildIssueBody(ep, alert, result)),
 		})
 		if err != nil {
 			return fmt.Errorf("failed to create issue: %w", err)
 		}
 	} else {
-		issues, _, err := provider.githubClient.Issues.ListByRepo(context.Background(), provider.repositoryOwner, provider.repositoryName, &github.IssueListByRepoOptions{
+		issues, _, err := cfg.githubClient.Issues.ListByRepo(context.Background(), cfg.repositoryOwner, cfg.repositoryName, &github.IssueListByRepoOptions{
 			State:       "open",
-			Creator:     provider.username,
+			Creator:     cfg.username,
 			ListOptions: github.ListOptions{PerPage: 100},
 		})
 		if err != nil {
@@ -91,7 +127,7 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 		}
 		for _, issue := range issues {
 			if *issue.Title == title {
-				_, _, err = provider.githubClient.Issues.Edit(context.Background(), provider.repositoryOwner, provider.repositoryName, *issue.Number, &github.IssueRequest{
+				_, _, err = cfg.githubClient.Issues.Edit(context.Background(), cfg.repositoryOwner, cfg.repositoryName, *issue.Number, &github.IssueRequest{
 					State: github.String("closed"),
 				})
 				if err != nil {
@@ -104,26 +140,51 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 }
 
 // buildIssueBody builds the body of the issue
-func (provider *AlertProvider) buildIssueBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result) string {
+func (provider *AlertProvider) buildIssueBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result) string {
-	var results string
+	var formattedConditionResults string
-	for _, conditionResult := range result.ConditionResults {
+	if len(result.ConditionResults) > 0 {
-		var prefix string
+		formattedConditionResults = "\n\n## Condition results\n"
-		if conditionResult.Success {
+		for _, conditionResult := range result.ConditionResults {
-			prefix = ":white_check_mark:"
+			var prefix string
-		} else {
+			if conditionResult.Success {
-			prefix = ":x:"
+				prefix = ":white_check_mark:"
+			} else {
+				prefix = ":x:"
+			}
+			formattedConditionResults += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
 		}
-		results += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = ":\n> " + alertDescription
 	}
-	message := fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+	message := fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
-	return message + description + "\n\n## Condition results\n" + results
+	return message + description + formattedConditionResults
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/github/github_test.go

@@ -7,47 +7,51 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 	"github.com/google/go-github/v48/github"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
-		Name     string
+		Name          string
-		Provider AlertProvider
+		Provider      AlertProvider
-		Expected bool
+		ExpectedError bool
 	}{
 		{
-			Name:     "invalid",
+			Name:          "invalid",
-			Provider: AlertProvider{RepositoryURL: "", Token: ""},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "", Token: ""}},
-			Expected: false,
+			ExpectedError: true,
 		},
 		{
-			Name:     "invalid-token",
+			Name:          "invalid-token",
-			Provider: AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
-			Expected: false,
+			ExpectedError: true,
 		},
 		{
-			Name:     "missing-repository-name",
+			Name:          "missing-repository-name",
-			Provider: AlertProvider{RepositoryURL: "https://github.com/TwiN", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN", Token: "12345"}},
-			Expected: false,
+			ExpectedError: true,
 		},
 		{
-			Name:     "enterprise-client",
+			Name:          "enterprise-client",
-			Provider: AlertProvider{RepositoryURL: "https://github.example.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.example.com/TwiN/test", Token: "12345"}},
-			Expected: false,
+			ExpectedError: true,
 		},
 		{
-			Name:     "invalid-url",
+			Name:          "invalid-url",
-			Provider: AlertProvider{RepositoryURL: "github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "github.com/TwiN/test", Token: "12345"}},
-			Expected: false,
+			ExpectedError: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			if scenario.Provider.IsValid() != scenario.Expected {
+			err := scenario.Provider.Validate()
-				t.Errorf("expected %t, got %t", scenario.Expected, scenario.Provider.IsValid())
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
 			}
 		})
 	}
@@ -67,14 +71,14 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:          "triggered-error",
-			Provider:      AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
 			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      false,
 			ExpectedError: true,
 		},
 		{
 			Name:          "resolved-error",
-			Provider:      AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
 			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      true,
 			ExpectedError: true,
@@ -82,13 +86,17 @@ func TestAlertProvider_Send(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			scenario.Provider.githubClient = github.NewClient(nil)
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+			cfg.githubClient = github.NewClient(nil)
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
-			err := scenario.Provider.Send(
+			err = scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -109,37 +117,48 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	firstDescription := "description-1"
 	scenarios := []struct {
 		Name         string
-		Endpoint     core.Endpoint
+		Endpoint     endpoint.Endpoint
 		Provider     AlertProvider
 		Alert        alert.Alert
+		NoConditions bool
 		ExpectedBody string
 	}{
 		{
 			Name:         "triggered",
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 3},
 			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\n> description-1\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
 		},
 		{
-			Name:         "no-description",
+			Name:         "triggered-with-no-description",
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{FailureThreshold: 10},
 			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
 		},
+		{
+			Name:         "triggered-with-no-conditions",
+			NoConditions: true,
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 10},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row:\n> description-1",
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: true},
+					{Condition: "[STATUS] == 200", Success: false},
+				}
+			}
 			body := scenario.Provider.buildIssueBody(
 				&scenario.Endpoint,
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{ConditionResults: conditionResults},
-					ConditionResults: []*core.ConditionResult{
-						{Condition: "[CONNECTED] == true", Success: true},
-						{Condition: "[STATUS] == 200", Success: false},
-					},
-				},
 			)
 			if strings.TrimSpace(body) != strings.TrimSpace(scenario.ExpectedBody) {
 				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
@@ -149,10 +168,54 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://github.com/TwiN/alert-test", "token": "54321"}},
+			ExpectedOutput: Config{RepositoryURL: "https://github.com/TwiN/alert-test", Token: "54321"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.RepositoryURL != scenario.ExpectedOutput.RepositoryURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.RepositoryURL, got.RepositoryURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/gitlab/gitlab.go

@@ -0,0 +1,204 @@
+package gitlab
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/google/uuid"
+	"gopkg.in/yaml.v3"
+)
+
+const (
+	DefaultSeverity       = "critical"
+	DefaultMonitoringTool = "gatus"
+)
+
+var (
+	ErrInvalidWebhookURL      = fmt.Errorf("invalid webhook-url")
+	ErrAuthorizationKeyNotSet = fmt.Errorf("authorization-key not set")
+)
+
+type Config struct {
+	WebhookURL       string `yaml:"webhook-url"`                // The webhook url provided by GitLab
+	AuthorizationKey string `yaml:"authorization-key"`          // The authorization key provided by GitLab
+	Severity         string `yaml:"severity,omitempty"`         // Severity can be one of: critical, high, medium, low, info, unknown. Defaults to critical
+	MonitoringTool   string `yaml:"monitoring-tool,omitempty"`  // MonitoringTool overrides the name sent to gitlab. Defaults to gatus
+	EnvironmentName  string `yaml:"environment-name,omitempty"` // EnvironmentName is the name of the associated GitLab environment. Required to display alerts on a dashboard.
+	Service          string `yaml:"service,omitempty"`          // Service affected. Defaults to the endpoint's display name
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrInvalidWebhookURL
+	} else if _, err := url.Parse(cfg.WebhookURL); err != nil {
+		return ErrInvalidWebhookURL
+	}
+	if len(cfg.AuthorizationKey) == 0 {
+		return ErrAuthorizationKeyNotSet
+	}
+	if len(cfg.Severity) == 0 {
+		cfg.Severity = DefaultSeverity
+	}
+	if len(cfg.MonitoringTool) == 0 {
+		cfg.MonitoringTool = DefaultMonitoringTool
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.AuthorizationKey) > 0 {
+		cfg.AuthorizationKey = override.AuthorizationKey
+	}
+	if len(override.Severity) > 0 {
+		cfg.Severity = override.Severity
+	}
+	if len(override.MonitoringTool) > 0 {
+		cfg.MonitoringTool = override.MonitoringTool
+	}
+	if len(override.EnvironmentName) > 0 {
+		cfg.EnvironmentName = override.EnvironmentName
+	}
+	if len(override.Service) > 0 {
+		cfg.Service = override.Service
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using GitLab
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
+}
+
+// Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
+// or closes the relevant issue(s) if the resolved parameter passed is true.
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	if len(alert.ResolveKey) == 0 {
+		alert.ResolveKey = uuid.NewString()
+	}
+	buffer := bytes.NewBuffer(provider.buildAlertBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", cfg.AuthorizationKey))
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+type AlertBody struct {
+	Title                 string `json:"title,omitempty"`                   // The title of the alert.
+	Description           string `json:"description,omitempty"`             // A high-level summary of the problem.
+	StartTime             string `json:"start_time,omitempty"`              // The time of the alert. If none is provided, a current time is used.
+	EndTime               string `json:"end_time,omitempty"`                // The resolution time of the alert. If provided, the alert is resolved.
+	Service               string `json:"service,omitempty"`                 // The affected service.
+	MonitoringTool        string `json:"monitoring_tool,omitempty"`         // The name of the associated monitoring tool.
+	Hosts                 string `json:"hosts,omitempty"`                   // One or more hosts, as to where this incident occurred.
+	Severity              string `json:"severity,omitempty"`                // The severity of the alert. Case-insensitive. Can be one of: critical, high, medium, low, info, unknown. Defaults to critical if missing or value is not in this list.
+	Fingerprint           string `json:"fingerprint,omitempty"`             // The unique identifier of the alert. This can be used to group occurrences of the same alert.
+	GitlabEnvironmentName string `json:"gitlab_environment_name,omitempty"` // The name of the associated GitLab environment. Required to display alerts on a dashboard.
+}
+
+// buildAlertBody builds the body of the alert
+func (provider *AlertProvider) buildAlertBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	service := cfg.Service
+	if len(service) == 0 {
+		service = ep.DisplayName()
+	}
+	body := AlertBody{
+		Title:                 fmt.Sprintf("alert(%s): %s", cfg.MonitoringTool, service),
+		StartTime:             result.Timestamp.Format(time.RFC3339),
+		Service:               service,
+		MonitoringTool:        cfg.MonitoringTool,
+		Hosts:                 ep.URL,
+		GitlabEnvironmentName: cfg.EnvironmentName,
+		Severity:              cfg.Severity,
+		Fingerprint:           alert.ResolveKey,
+	}
+	if resolved {
+		body.EndTime = result.Timestamp.Format(time.RFC3339)
+	}
+	var formattedConditionResults string
+	if len(result.ConditionResults) > 0 {
+		formattedConditionResults = "\n\n## Condition results\n"
+		for _, conditionResult := range result.ConditionResults {
+			var prefix string
+			if conditionResult.Success {
+				prefix = ":white_check_mark:"
+			} else {
+				prefix = ":x:"
+			}
+			formattedConditionResults += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
+		}
+	}
+	var description string
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		description = ":\n> " + alertDescription
+	}
+	var message string
+	if resolved {
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	body.Description = message + description + formattedConditionResults
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gitlab/gitlab_test.go

@@ -0,0 +1,223 @@
+package gitlab
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		Name          string
+		Provider      AlertProvider
+		ExpectedError bool
+	}{
+		{
+			Name:          "invalid",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "", AuthorizationKey: ""}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "missing-webhook-url",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "", AuthorizationKey: "12345"}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "missing-authorization-key",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/whatever/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: ""}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "invalid-url",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: " http://foo.com", AuthorizationKey: "12345"}},
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			err := scenario.Provider.Validate()
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:          "triggered-error",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
+			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      false,
+			ExpectedError: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+		},
+		{
+			Name:          "resolved-error",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
+			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      true,
+			ExpectedError: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildAlertBody(t *testing.T) {
+	firstDescription := "description-1"
+	scenarios := []struct {
+		Name         string
+		Endpoint     endpoint.Endpoint
+		Provider     AlertProvider
+		Alert        alert.Alert
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 3},
+			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\",\"severity\":\"critical\"}",
+		},
+		{
+			Name:         "no-description",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
+			Alert:        alert.Alert{FailureThreshold: 10},
+			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 10 time(s) in a row\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\",\"severity\":\"critical\"}",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			body := scenario.Provider.buildAlertBody(
+				cfg,
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: true},
+						{Condition: "[STATUS] == 200", Success: false},
+					},
+				},
+				false,
+			)
+			if strings.TrimSpace(string(body)) != strings.TrimSpace(scenario.ExpectedBody) {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345", Severity: DefaultSeverity, MonitoringTool: DefaultMonitoringTool},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://github.com/TwiN/alert-test", "authorization-key": "54321", "severity": "info", "monitoring-tool": "not-gatus", "environment-name": "prod", "service": "example"}},
+			ExpectedOutput: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "54321", Severity: "info", MonitoringTool: "not-gatus", EnvironmentName: "prod", Service: "example"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			if got.AuthorizationKey != scenario.ExpectedOutput.AuthorizationKey {
+				t.Errorf("expected AuthorizationKey %s, got %s", scenario.ExpectedOutput.AuthorizationKey, got.AuthorizationKey)
+			}
+			if got.Severity != scenario.ExpectedOutput.Severity {
+				t.Errorf("expected Severity %s, got %s", scenario.ExpectedOutput.Severity, got.Severity)
+			}
+			if got.MonitoringTool != scenario.ExpectedOutput.MonitoringTool {
+				t.Errorf("expected MonitoringTool %s, got %s", scenario.ExpectedOutput.MonitoringTool, got.MonitoringTool)
+			}
+			if got.EnvironmentName != scenario.ExpectedOutput.EnvironmentName {
+				t.Errorf("expected EnvironmentName %s, got %s", scenario.ExpectedOutput.EnvironmentName, got.EnvironmentName)
+			}
+			if got.Service != scenario.ExpectedOutput.Service {
+				t.Errorf("expected Service %s, got %s", scenario.ExpectedOutput.Service, got.Service)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/googlechat/googlechat.go

@@ -3,21 +3,46 @@ package googlechat
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL   string         `yaml:"webhook-url"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Google chat
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
+	DefaultConfig Config `yaml:",inline"`
-
-	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client,omitempty"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -28,36 +53,37 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
+	Group  string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	if provider.ClientConfig == nil {
-		provider.ClientConfig = client.GetDefaultConfig()
-	}
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -112,7 +138,7 @@ type OpenLink struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message, color string
 	if resolved {
 		color = "#36A64F"
@@ -121,7 +147,7 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		color = "#DD0000"
 		message = fmt.Sprintf("<font color='%s'>An alert has been triggered due to having failed %d time(s) in a row</font>", color, alert.FailureThreshold)
 	}
-	var results string
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -129,7 +155,7 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		} else {
 			prefix = "❌"
 		}
-		results += fmt.Sprintf("%s   %s<br>", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("%s   %s<br>", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
@@ -143,28 +169,30 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 						Widgets: []Widgets{
 							{
 								KeyValue: &KeyValue{
-									TopLabel:         endpoint.DisplayName(),
+									TopLabel:         ep.DisplayName(),
 									Content:          message,
 									ContentMultiline: "true",
 									BottomLabel:      description,
 									Icon:             "BOOKMARK",
 								},
 							},
-							{
-								KeyValue: &KeyValue{
-									TopLabel:         "Condition results",
-									Content:          results,
-									ContentMultiline: "true",
-									Icon:             "DESCRIPTION",
-								},
-							},
 						},
 					},
 				},
 			},
 		},
 	}
-	if endpoint.Type() == core.EndpointTypeHTTP {
+	if len(formattedConditionResults) > 0 {
+		payload.Cards[0].Sections[0].Widgets = append(payload.Cards[0].Sections[0].Widgets, Widgets{
+			KeyValue: &KeyValue{
+				TopLabel:         "Condition results",
+				Content:          formattedConditionResults,
+				ContentMultiline: "true",
+				Icon:             "DESCRIPTION",
+			},
+		})
+	}
+	if ep.Type() == endpoint.TypeHTTP {
 		// We only include a button targeting the URL if the endpoint is an HTTP endpoint
 		// If the URL isn't prefixed with https://, Google Chat will just display a blank message aynways.
 		// See https://github.com/TwiN/gatus/issues/362
@@ -173,29 +201,48 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 				{
 					TextButton: TextButton{
 						Text:    "URL",
-						OnClick: OnClick{OpenLink: OpenLink{URL: endpoint.URL}},
+						OnClick: OnClick{OpenLink: OpenLink{URL: ep.URL}},
 					},
 				},
 			},
 		})
 	}
-	body, _ := json.Marshal(payload)
+	bodyAsJSON, _ := json.Marshal(payload)
-	return body
+	return bodyAsJSON
-}
-
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
-	}
-	return provider.WebhookURL
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/googlechat/googlechat_test.go

@@ -7,54 +7,54 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
+				Config: Config{WebhookURL: ""},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -73,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -93,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -103,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -116,10 +116,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -141,7 +141,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	secondDescription := "description-2"
 	scenarios := []struct {
 		Name         string
-		Endpoint     core.Endpoint
+		Endpoint     endpoint.Endpoint
 		Provider     AlertProvider
 		Alert        alert.Alert
 		Resolved     bool
@@ -149,7 +149,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
@@ -157,7 +157,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		},
 		{
 			Name:         "resolved",
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
@@ -165,7 +165,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		},
 		{
 			Name:         "icmp-should-not-include-url", // See https://github.com/TwiN/gatus/issues/362
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "icmp://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "icmp://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
@@ -173,7 +173,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		},
 		{
 			Name:         "tcp-should-not-include-url", // See https://github.com/TwiN/gatus/issues/362
-			Endpoint:     core.Endpoint{Name: "endpoint-name", URL: "tcp://example.org"},
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "tcp://example.org"},
 			Provider:     AlertProvider{},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
@@ -185,8 +185,8 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
 				&scenario.Endpoint,
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -205,72 +205,100 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/gotify/gotify.go

@@ -0,0 +1,161 @@
+package gotify
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+const DefaultPriority = 5
+
+var (
+	ErrServerURLNotSet = errors.New("server URL not set")
+	ErrTokenNotSet     = errors.New("token not set")
+)
+
+type Config struct {
+	ServerURL string `yaml:"server-url"`         // URL of the Gotify server
+	Token     string `yaml:"token"`              // Token to use when sending a message to the Gotify server
+	Priority  int    `yaml:"priority,omitempty"` // Priority of the message. Defaults to DefaultPriority.
+	Title     string `yaml:"title,omitempty"`    // Title of the message that will be sent
+}
+
+func (cfg *Config) Validate() error {
+	if cfg.Priority == 0 {
+		cfg.Priority = DefaultPriority
+	}
+	if len(cfg.ServerURL) == 0 {
+		return ErrServerURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ServerURL) > 0 {
+		cfg.ServerURL = override.ServerURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if override.Priority != 0 {
+		cfg.Priority = override.Priority
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Gotify
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.ServerURL+"/message?token="+cfg.Token, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("failed to send alert to Gotify: %s", string(body))
+	}
+	return nil
+}
+
+type Body struct {
+	Message  string `json:"message"`
+	Title    string `json:"title"`
+	Priority int    `json:"priority"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("An alert for `%s` has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		message = fmt.Sprintf("An alert for `%s` has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	var formattedConditionResults string
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = "✓"
+		} else {
+			prefix = "✕"
+		}
+		formattedConditionResults += fmt.Sprintf("\n%s - %s", prefix, conditionResult.Condition)
+	}
+	if len(alert.GetDescription()) > 0 {
+		message += " with the following description: " + alert.GetDescription()
+	}
+	message += formattedConditionResults
+	title := "Gatus: " + ep.DisplayName()
+	if cfg.Title != "" {
+		title = cfg.Title
+	}
+	bodyAsJSON, _ := json.Marshal(Body{
+		Message:  message,
+		Title:    title,
+		Priority: cfg.Priority,
+	})
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gotify/gotify_test.go

@@ -0,0 +1,163 @@
+package gotify
+
+import (
+	"encoding/json"
+	"fmt"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected bool
+	}{
+		{
+			name:     "valid",
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
+			expected: true,
+		},
+		{
+			name:     "invalid-server-url",
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "", Token: "faketoken"}},
+			expected: false,
+		},
+		{
+			name:     "invalid-app-token",
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: ""}},
+			expected: false,
+		},
+		{
+			name:     "no-priority-should-use-default-value",
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
+			expected: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			if err := scenario.provider.Validate(); (err == nil) != scenario.expected {
+				t.Errorf("expected: %t, got: %t", scenario.expected, err == nil)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	var (
+		description = "custom-description"
+		//title       = "custom-title"
+		endpointName = "custom-endpoint"
+	)
+	scenarios := []struct {
+		Name         string
+		Provider     AlertProvider
+		Alert        alert.Alert
+		Resolved     bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been triggered due to having failed 3 time(s) in a row with the following description: %s\\n✕ - [CONNECTED] == true\\n✕ - [STATUS] == 200\",\"title\":\"Gatus: custom-endpoint\",\"priority\":0}", endpointName, description),
+		},
+		{
+			Name:         "resolved",
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been resolved after passing successfully 5 time(s) in a row with the following description: %s\\n✓ - [CONNECTED] == true\\n✓ - [STATUS] == 200\",\"title\":\"Gatus: custom-endpoint\",\"priority\":0}", endpointName, description),
+		},
+		{
+			Name:         "custom-title",
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken", Title: "custom-title"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been triggered due to having failed 3 time(s) in a row with the following description: %s\\n✕ - [CONNECTED] == true\\n✕ - [STATUS] == 200\",\"title\":\"custom-title\",\"priority\":0}", endpointName, description),
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: endpointName},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if string(body) != scenario.ExpectedBody {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+			out := make(map[string]interface{})
+			if err := json.Unmarshal(body, &out); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	provider := AlertProvider{DefaultAlert: &alert.Alert{}}
+	if provider.GetDefaultAlert() != provider.DefaultAlert {
+		t.Error("expected default alert to be returned")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ServerURL: "https://gotify.example.com", Token: "12345", Priority: DefaultPriority},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"server-url": "https://gotify.group-example.com", "token": "54321", "title": "alert-title", "priority": 3}},
+			ExpectedOutput: Config{ServerURL: "https://gotify.group-example.com", Token: "54321", Title: "alert-title", Priority: 3},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Error("expected no error, got:", err.Error())
+			}
+			if got.ServerURL != scenario.ExpectedOutput.ServerURL {
+				t.Errorf("expected server URL to be %s, got %s", scenario.ExpectedOutput.ServerURL, got.ServerURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token to be %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if got.Title != scenario.ExpectedOutput.Title {
+				t.Errorf("expected title to be %s, got %s", scenario.ExpectedOutput.Title, got.Title)
+			}
+			if got.Priority != scenario.ExpectedOutput.Priority {
+				t.Errorf("expected priority to be %d, got %d", scenario.ExpectedOutput.Priority, got.Priority)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/jetbrainsspace/jetbrainsspace.go

@@ -0,0 +1,223 @@
+package jetbrainsspace
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrProjectNotSet          = errors.New("project not set")
+	ErrChannelIDNotSet        = errors.New("channel-id not set")
+	ErrTokenNotSet            = errors.New("token not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	Project   string `yaml:"project"`    // Project name
+	ChannelID string `yaml:"channel-id"` // Chat Channel ID
+	Token     string `yaml:"token"`      // Bearer Token
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.Project) == 0 {
+		return ErrProjectNotSet
+	}
+	if len(cfg.ChannelID) == 0 {
+		return ErrChannelIDNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.Project) > 0 {
+		cfg.Project = override.Project
+	}
+	if len(override.ChannelID) > 0 {
+		cfg.ChannelID = override.ChannelID
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using JetBrains Space
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	url := fmt.Sprintf("https://%s.jetbrains.space/api/http/chats/messages/send-message", cfg.Project)
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Authorization", "Bearer "+cfg.Token)
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+type Body struct {
+	Channel string  `json:"channel"`
+	Content Content `json:"content"`
+}
+
+type Content struct {
+	ClassName string    `json:"className"`
+	Style     string    `json:"style"`
+	Sections  []Section `json:"sections,omitempty"`
+}
+
+type Section struct {
+	ClassName string    `json:"className"`
+	Elements  []Element `json:"elements"`
+	Header    string    `json:"header"`
+}
+
+type Element struct {
+	ClassName string    `json:"className"`
+	Accessory Accessory `json:"accessory"`
+	Style     string    `json:"style"`
+	Size      string    `json:"size"`
+	Content   string    `json:"content"`
+}
+
+type Accessory struct {
+	ClassName string `json:"className"`
+	Icon      Icon   `json:"icon"`
+	Style     string `json:"style"`
+}
+
+type Icon struct {
+	Icon string `json:"icon"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	body := Body{
+		Channel: "id:" + cfg.ChannelID,
+		Content: Content{
+			ClassName: "ChatMessage.Block",
+			Sections: []Section{{
+				ClassName: "MessageSection",
+				Elements:  []Element{},
+			}},
+		},
+	}
+	if resolved {
+		body.Content.Style = "SUCCESS"
+		body.Content.Sections[0].Header = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		body.Content.Style = "WARNING"
+		body.Content.Sections[0].Header = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	for _, conditionResult := range result.ConditionResults {
+		icon := "warning"
+		style := "WARNING"
+		if conditionResult.Success {
+			icon = "success"
+			style = "SUCCESS"
+		}
+		body.Content.Sections[0].Elements = append(body.Content.Sections[0].Elements, Element{
+			ClassName: "MessageText",
+			Accessory: Accessory{
+				ClassName: "MessageIcon",
+				Icon:      Icon{Icon: icon},
+				Style:     style,
+			},
+			Style:   style,
+			Size:    "REGULAR",
+			Content: conditionResult.Condition,
+		})
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/jetbrainsspace/jetbrainsspace_test.go

@@ -0,0 +1,318 @@
+package jetbrainsspace
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{Project: ""}}
+	if err := invalidProvider.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{Project: "foo", ChannelID: "bar", Token: "baz"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		DefaultConfig: Config{Project: "foobar"},
+		Overrides: []Override{
+			{
+				Config: Config{ChannelID: "http://example.com"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithInvalidOverrideTo := AlertProvider{
+		DefaultConfig: Config{Project: "foobar"},
+		Overrides: []Override{
+			{
+				Config: Config{ChannelID: ""},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
+		t.Error("provider integration key shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{
+			Project:   "foo",
+			ChannelID: "bar",
+			Token:     "baz",
+		},
+		Overrides: []Override{
+			{
+				Config: Config{ChannelID: "foobar"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project", Token: "token"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project", Token: "token"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project", Token: "token"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-error",
+			Provider: AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project", Token: "token"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name         string
+		Provider     AlertProvider
+		Endpoint     endpoint.Endpoint
+		Alert        alert.Alert
+		Resolved     bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project"}},
+			Endpoint:     endpoint.Endpoint{Name: "name"},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"channel":"id:1","content":{"className":"ChatMessage.Block","style":"WARNING","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *name* has been triggered due to having failed 3 time(s) in a row"}]}}`,
+		},
+		{
+			Name:         "triggered-with-group",
+			Provider:     AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project"}},
+			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"channel":"id:1","content":{"className":"ChatMessage.Block","style":"WARNING","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *group/name* has been triggered due to having failed 3 time(s) in a row"}]}}`,
+		},
+		{
+			Name:         "resolved",
+			Provider:     AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project"}},
+			Endpoint:     endpoint.Endpoint{Name: "name"},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: `{"channel":"id:1","content":{"className":"ChatMessage.Block","style":"SUCCESS","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *name* has been resolved after passing successfully 5 time(s) in a row"}]}}`,
+		},
+		{
+			Name:         "resolved-with-group",
+			Provider:     AlertProvider{DefaultConfig: Config{ChannelID: "1", Project: "project"}},
+			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: `{"channel":"id:1","content":{"className":"ChatMessage.Block","style":"SUCCESS","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *group/name* has been resolved after passing successfully 5 time(s) in a row"}]}}`,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if string(body) != scenario.ExpectedBody {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+			out := make(map[string]interface{})
+			if err := json.Unmarshal(body, &out); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ChannelID: "default", Project: "project", Token: "token"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ChannelID: "default", Project: "project", Token: "token"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ChannelID: "default", Project: "project", Token: "token"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ChannelID: "default", Project: "project", Token: "token"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ChannelID: "default", Project: "project", Token: "token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{ChannelID: "group-channel"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ChannelID: "default", Project: "project", Token: "token"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ChannelID: "default", Project: "project", Token: "token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{ChannelID: "group-channel"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ChannelID: "group-channel", Project: "project", Token: "token"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ChannelID: "default", Project: "project", Token: "token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{ChannelID: "group-channel"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"channel-id": "alert-channel", "project": "alert-project", "token": "alert-token"}},
+			ExpectedOutput: Config{ChannelID: "alert-channel", Project: "alert-project", Token: "alert-token"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.ChannelID != scenario.ExpectedOutput.ChannelID {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.ChannelID, got.ChannelID)
+			}
+			if got.Project != scenario.ExpectedOutput.Project {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.Project, got.Project)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/matrix/matrix.go

@@ -3,6 +3,7 @@ package matrix
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"math/rand"
@@ -12,30 +13,19 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Matrix
+const defaultServerURL = "https://matrix-client.matrix.org"
-type AlertProvider struct {
-	MatrixProviderConfig `yaml:",inline"`
 
-	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+var (
-	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+	ErrAccessTokenNotSet      = errors.New("access-token not set")
+	ErrInternalRoomID         = errors.New("internal-room-id not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
 
-	// Overrides is a list of Override that may be prioritized over the default configuration
+type Config struct {
-	Overrides []Override `yaml:"overrides,omitempty"`
-}
-
-// Override is a case under which the default integration is overridden
-type Override struct {
-	Group string `yaml:"group"`
-
-	MatrixProviderConfig `yaml:",inline"`
-}
-
-const defaultHomeserverURL = "https://matrix-client.matrix.org"
-
-type MatrixProviderConfig struct {
 	// ServerURL is the custom homeserver to use (optional)
 	ServerURL string `yaml:"server-url"`
 
@@ -46,36 +36,78 @@ type MatrixProviderConfig struct {
 	InternalRoomID string `yaml:"internal-room-id"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+func (cfg *Config) Validate() error {
-func (provider *AlertProvider) IsValid() bool {
+	if len(cfg.ServerURL) == 0 {
+		cfg.ServerURL = defaultServerURL
+	}
+	if len(cfg.AccessToken) == 0 {
+		return ErrAccessTokenNotSet
+	}
+	if len(cfg.InternalRoomID) == 0 {
+		return ErrInternalRoomID
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ServerURL) > 0 {
+		cfg.ServerURL = override.ServerURL
+	}
+	if len(override.AccessToken) > 0 {
+		cfg.AccessToken = override.AccessToken
+	}
+	if len(override.InternalRoomID) > 0 {
+		cfg.InternalRoomID = override.InternalRoomID
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Matrix
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.AccessToken) == 0 || len(override.InternalRoomID) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.AccessToken) > 0 && len(provider.InternalRoomID) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	config := provider.getConfigForGroup(endpoint.Group)
+	if err != nil {
-	if config.ServerURL == "" {
+		return err
-		config.ServerURL = defaultHomeserverURL
 	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
 	// The Matrix endpoint requires a unique transaction ID for each event sent
 	txnId := randStringBytes(24)
 	request, err := http.NewRequest(
 		http.MethodPut,
 		fmt.Sprintf("%s/_matrix/client/v3/rooms/%s/send/m.room.message/%s?access_token=%s",
-			config.ServerURL,
+			cfg.ServerURL,
-			url.PathEscape(config.InternalRoomID),
+			url.PathEscape(cfg.InternalRoomID),
 			txnId,
-			url.QueryEscape(config.AccessToken),
+			url.QueryEscape(cfg.AccessToken),
 		),
 		buffer,
 	)
@@ -103,24 +135,25 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	body, _ := json.Marshal(Body{
 		MsgType:       "m.text",
 		Format:        "org.matrix.custom.html",
-		Body:          buildPlaintextMessageBody(endpoint, alert, result, resolved),
+		Body:          buildPlaintextMessageBody(ep, alert, result, resolved),
-		FormattedBody: buildHTMLMessageBody(endpoint, alert, result, resolved),
+		FormattedBody: buildHTMLMessageBody(ep, alert, result, resolved),
 	})
 	return body
 }
 
 // buildPlaintextMessageBody builds the message body in plaintext to include in request
-func buildPlaintextMessageBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) string {
+func buildPlaintextMessageBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) string {
-	var message, results string
+	var message string
 	if resolved {
-		message = fmt.Sprintf("An alert for `%s` has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for `%s` has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 	} else {
-		message = fmt.Sprintf("An alert for `%s` has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for `%s` has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 	}
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -128,49 +161,42 @@ func buildPlaintextMessageBody(endpoint *core.Endpoint, alert *alert.Alert, resu
 		} else {
 			prefix = "✕"
 		}
-		results += fmt.Sprintf("\n%s - %s", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("\n%s - %s", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = "\n" + alertDescription
 	}
-	return fmt.Sprintf("%s%s\n%s", message, description, results)
+	return fmt.Sprintf("%s%s\n%s", message, description, formattedConditionResults)
 }
 
 // buildHTMLMessageBody builds the message body in HTML to include in request
-func buildHTMLMessageBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) string {
+func buildHTMLMessageBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) string {
-	var message, results string
+	var message string
 	if resolved {
-		message = fmt.Sprintf("An alert for <code>%s</code> has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for <code>%s</code> has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 	} else {
-		message = fmt.Sprintf("An alert for <code>%s</code> has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for <code>%s</code> has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 	}
-	for _, conditionResult := range result.ConditionResults {
+	var formattedConditionResults string
-		var prefix string
+	if len(result.ConditionResults) > 0 {
-		if conditionResult.Success {
+		formattedConditionResults = "\n<h5>Condition results</h5><ul>"
-			prefix = "✅"
+		for _, conditionResult := range result.ConditionResults {
-		} else {
+			var prefix string
-			prefix = "❌"
+			if conditionResult.Success {
+				prefix = "✅"
+			} else {
+				prefix = "❌"
+			}
+			formattedConditionResults += fmt.Sprintf("<li>%s - <code>%s</code></li>", prefix, conditionResult.Condition)
 		}
-		results += fmt.Sprintf("<li>%s - <code>%s</code></li>", prefix, conditionResult.Condition)
+		formattedConditionResults += "</ul>"
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = fmt.Sprintf("\n<blockquote>%s</blockquote>", alertDescription)
 	}
-	return fmt.Sprintf("<h3>%s</h3>%s\n<h5>Condition results</h5><ul>%s</ul>", message, description, results)
+	return fmt.Sprintf("<h3>%s</h3>%s%s", message, description, formattedConditionResults)
-}
-
-// getConfigForGroup returns the appropriate configuration for a given group
-func (provider *AlertProvider) getConfigForGroup(group string) MatrixProviderConfig {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.MatrixProviderConfig
-			}
-		}
-	}
-	return provider.MatrixProviderConfig
 }
 
 func randStringBytes(n int) string {
@@ -185,6 +211,37 @@ func randStringBytes(n int) string {
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/matrix/matrix_test.go

@@ -7,79 +7,79 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	invalidProvider := AlertProvider{
-		MatrixProviderConfig: MatrixProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "",
 			InternalRoomID: "",
 		},
 	}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
 	validProvider := AlertProvider{
-		MatrixProviderConfig: MatrixProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 	}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 	validProviderWithHomeserver := AlertProvider{
-		MatrixProviderConfig: MatrixProviderConfig{
+		DefaultConfig: Config{
 			ServerURL:      "https://example.com",
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 	}
-	if !validProviderWithHomeserver.IsValid() {
+	if err := validProviderWithHomeserver.Validate(); err != nil {
 		t.Error("provider with homeserver should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
 				Group: "",
-				MatrixProviderConfig: MatrixProviderConfig{
+				Config: Config{
 					AccessToken:    "",
 					InternalRoomID: "",
 				},
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
 				Group: "group",
-				MatrixProviderConfig: MatrixProviderConfig{
+				Config: Config{
 					AccessToken:    "",
 					InternalRoomID: "",
 				},
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		MatrixProviderConfig: MatrixProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 		Overrides: []Override{
 			{
 				Group: "group",
-				MatrixProviderConfig: MatrixProviderConfig{
+				Config: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -87,7 +87,7 @@ func TestAlertProvider_IsValidWithOverride(t *testing.T) {
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -105,18 +105,28 @@ func TestAlertProvider_Send(t *testing.T) {
 		ExpectedError    bool
 	}{
 		{
-			Name:     "triggered",
+			Name:     "triggered-with-bad-config",
 			Provider: AlertProvider{},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
 				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
 			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
 			ExpectedError: false,
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -126,7 +136,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -136,7 +146,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -149,10 +159,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -197,10 +207,10 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -219,25 +229,26 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getConfigForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput MatrixProviderConfig
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				MatrixProviderConfig: MatrixProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -245,7 +256,8 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: nil,
 			},
 			InputGroup: "",
-			ExpectedOutput: MatrixProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -254,7 +266,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				MatrixProviderConfig: MatrixProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -262,7 +274,8 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: nil,
 			},
 			InputGroup: "group",
-			ExpectedOutput: MatrixProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -271,7 +284,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				MatrixProviderConfig: MatrixProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -279,16 +292,17 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: []Override{
 					{
 						Group: "group",
-						MatrixProviderConfig: MatrixProviderConfig{
+						Config: Config{
-							ServerURL:      "https://example01.com",
+							ServerURL:      "https://group-example.com",
 							AccessToken:    "12",
-							InternalRoomID: "!a:example01.com",
+							InternalRoomID: "!a:group-example.com",
 						},
 					},
 				},
 			},
 			InputGroup: "",
-			ExpectedOutput: MatrixProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -297,7 +311,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				MatrixProviderConfig: MatrixProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -305,8 +319,35 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: []Override{
 					{
 						Group: "group",
-						MatrixProviderConfig: MatrixProviderConfig{
+						Config: Config{
-							ServerURL:      "https://example01.com",
+							ServerURL:      "https://group-example.com",
+							AccessToken:    "12",
+							InternalRoomID: "!a:group-example.com",
+						},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
+				ServerURL:      "https://group-example.com",
+				AccessToken:    "12",
+				InternalRoomID: "!a:group-example.com",
+			},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					ServerURL:      "https://example.com",
+					AccessToken:    "1",
+					InternalRoomID: "!a:example.com",
+				},
+				Overrides: []Override{
+					{
+						Group: "group",
+						Config: Config{
+							ServerURL:      "https://group-example.com",
 							AccessToken:    "12",
 							InternalRoomID: "!a:example01.com",
 						},
@@ -314,17 +355,32 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				},
 			},
 			InputGroup: "group",
-			ExpectedOutput: MatrixProviderConfig{
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{"server-url": "https://alert-example.com", "access-token": "123", "internal-room-id": "!a:alert-example.com"}},
-				ServerURL:      "https://example01.com",
+			ExpectedOutput: Config{
-				AccessToken:    "12",
+				ServerURL:      "https://alert-example.com",
-				InternalRoomID: "!a:example01.com",
+				AccessToken:    "123",
+				InternalRoomID: "!a:alert-example.com",
 			},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getConfigForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			outputConfig, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getConfigForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Errorf("expected no error, got %v", err)
+			}
+			if outputConfig.ServerURL != scenario.ExpectedOutput.ServerURL {
+				t.Errorf("expected ServerURL to be %s, got %s", scenario.ExpectedOutput.ServerURL, outputConfig.ServerURL)
+			}
+			if outputConfig.AccessToken != scenario.ExpectedOutput.AccessToken {
+				t.Errorf("expected AccessToken to be %s, got %s", scenario.ExpectedOutput.AccessToken, outputConfig.AccessToken)
+			}
+			if outputConfig.InternalRoomID != scenario.ExpectedOutput.InternalRoomID {
+				t.Errorf("expected InternalRoomID to be %s, got %s", scenario.ExpectedOutput.InternalRoomID, outputConfig.InternalRoomID)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/mattermost/mattermost.go

@@ -3,21 +3,50 @@ package mattermost
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook URL not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL   string         `yaml:"webhook-url"`
+	Channel      string         `yaml:"channel,omitempty"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Channel) > 0 {
+		cfg.Channel = override.Channel
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Mattermost
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
+	DefaultConfig Config `yaml:",inline"`
-
-	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client,omitempty"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -28,36 +57,37 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
+	Group  string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	if provider.ClientConfig == nil {
-		provider.ClientConfig = client.GetDefaultConfig()
-	}
 	if provider.Overrides != nil {
 		registeredGroups := make(map[string]bool)
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(endpoint, alert, result, resolved)))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(cfg, ep, alert, result, resolved)))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -70,6 +100,7 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 }
 
 type Body struct {
+	Channel     string       `json:"channel,omitempty"` // Optional channel override
 	Text        string       `json:"text"`
 	Username    string       `json:"username"`
 	IconURL     string       `json:"icon_url"`
@@ -92,29 +123,33 @@ type Field struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	var message, color, results string
+	var message, color string
 	if resolved {
-		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 		color = "#36A64F"
 	} else {
-		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 		color = "#DD0000"
 	}
-	for _, conditionResult := range result.ConditionResults {
+	var formattedConditionResults string
-		var prefix string
+	if len(result.ConditionResults) > 0 {
-		if conditionResult.Success {
+		for _, conditionResult := range result.ConditionResults {
-			prefix = ":white_check_mark:"
+			var prefix string
-		} else {
+			if conditionResult.Success {
-			prefix = ":x:"
+				prefix = ":white_check_mark:"
+			} else {
+				prefix = ":x:"
+			}
+			formattedConditionResults += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = ":\n> " + alertDescription
 	}
-	body, _ := json.Marshal(Body{
+	body := Body{
+		Channel:  cfg.Channel,
 		Text:     "",
 		Username: "gatus",
 		IconURL:  "https://raw.githubusercontent.com/TwiN/gatus/master/.github/assets/logo.png",
@@ -125,32 +160,52 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 				Text:     message + description,
 				Short:    false,
 				Color:    color,
-				Fields: []Field{
-					{
-						Title: "Condition results",
-						Value: results,
-						Short: false,
-					},
-				},
 			},
 		},
-	})
-	return body
-}
-
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
 	}
-	return provider.WebhookURL
+	if len(formattedConditionResults) > 0 {
+		body.Attachments[0].Fields = append(body.Attachments[0].Fields, Field{
+			Title: "Condition results",
+			Value: formattedConditionResults,
+			Short: false,
+		})
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/mattermost/mattermost_test.go

@@ -7,58 +7,54 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "",
+				Group:  "",
 			},
 		},
 	}
-
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
-	if providerWithInvalidOverrideGroup.IsValid() {
 		t.Error("provider Group shouldn't have been valid")
 	}
-
 	providerWithInvalidOverrideWebHookUrl := AlertProvider{
 		Overrides: []Override{
 			{
-
+				Config: Config{WebhookURL: ""},
-				WebhookURL: "",
+				Group:  "group",
-				Group:      "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideWebHookUrl.IsValid() {
+	if err := providerWithInvalidOverrideWebHookUrl.Validate(); err == nil {
-		t.Error("provider WebHookURL shoudn't have been valid")
+		t.Error("provider WebHookURL shouldn't have been valid")
 	}
-
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -77,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -87,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -97,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -107,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -120,10 +116,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -168,10 +164,11 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -190,72 +187,100 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/messagebird/messagebird.go

@@ -3,44 +3,83 @@ package messagebird
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-const (
+const restAPIURL = "https://rest.messagebird.com/messages"
-	restAPIURL = "https://rest.messagebird.com/messages"
+
+var (
+	ErrorAccessKeyNotSet  = errors.New("access-key not set")
+	ErrorOriginatorNotSet = errors.New("originator not set")
+	ErrorRecipientsNotSet = errors.New("recipients not set")
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Messagebird
+type Config struct {
-type AlertProvider struct {
 	AccessKey  string `yaml:"access-key"`
 	Originator string `yaml:"originator"`
 	Recipients string `yaml:"recipients"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.AccessKey) == 0 {
+		return ErrorAccessKeyNotSet
+	}
+	if len(cfg.Originator) == 0 {
+		return ErrorOriginatorNotSet
+	}
+	if len(cfg.Recipients) == 0 {
+		return ErrorRecipientsNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.AccessKey) > 0 {
+		cfg.AccessKey = override.AccessKey
+	}
+	if len(override.Originator) > 0 {
+		cfg.Originator = override.Originator
+	}
+	if len(override.Recipients) > 0 {
+		cfg.Recipients = override.Recipients
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Messagebird
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	return len(provider.AccessKey) > 0 && len(provider.Originator) > 0 && len(provider.Recipients) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 // Reference doc for messagebird: https://developers.messagebird.com/api/sms-messaging/#send-outbound-sms
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
 	request, err := http.NewRequest(http.MethodPost, restAPIURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	request.Header.Set("Authorization", fmt.Sprintf("AccessKey %s", provider.AccessKey))
+	request.Header.Set("Authorization", fmt.Sprintf("AccessKey %s", cfg.AccessKey))
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -60,22 +99,44 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message string
 	if resolved {
-		message = fmt.Sprintf("RESOLVED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("RESOLVED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	} else {
-		message = fmt.Sprintf("TRIGGERED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("TRIGGERED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	}
 	body, _ := json.Marshal(Body{
-		Originator: provider.Originator,
+		Originator: cfg.Originator,
-		Recipients: provider.Recipients,
+		Recipients: cfg.Recipients,
 		Body:       message,
 	})
 	return body
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/messagebird/messagebird_test.go

@@ -7,21 +7,23 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
 func TestMessagebirdAlertProvider_IsValid(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
 	validProvider := AlertProvider{
-		AccessKey:  "1",
+		DefaultConfig: Config{
-		Originator: "1",
+			AccessKey:  "1",
-		Recipients: "1",
+			Originator: "1",
+			Recipients: "1",
+		},
 	}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -40,7 +42,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -50,7 +52,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -60,7 +62,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -70,7 +72,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,10 +85,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -115,14 +117,14 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{AccessKey: "1", Originator: "2", Recipients: "3"},
+			Provider:     AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"originator\":\"2\",\"recipients\":\"3\",\"body\":\"TRIGGERED: endpoint-name - description-1\"}",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{AccessKey: "4", Originator: "5", Recipients: "6"},
+			Provider:     AlertProvider{DefaultConfig: Config{AccessKey: "4", Originator: "5", Recipients: "6"}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"originator\":\"5\",\"recipients\":\"6\",\"body\":\"RESOLVED: endpoint-name - description-2\"}",
@@ -131,10 +133,11 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -145,7 +148,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
 			}
 			out := make(map[string]interface{})
-			if err := json.Unmarshal([]byte(body), &out); err != nil {
+			if err := json.Unmarshal(body, &out); err != nil {
 				t.Error("expected body to be valid JSON, got error:", err.Error())
 			}
 		})
@@ -153,10 +156,57 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"access-key": "4", "originator": "5", "recipients": "6"}},
+			ExpectedOutput: Config{AccessKey: "4", Originator: "5", Recipients: "6"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Error("expected no error, got:", err.Error())
+			}
+			if got.AccessKey != scenario.ExpectedOutput.AccessKey {
+				t.Errorf("expected access key to be %s, got %s", scenario.ExpectedOutput.AccessKey, got.AccessKey)
+			}
+			if got.Originator != scenario.ExpectedOutput.Originator {
+				t.Errorf("expected originator to be %s, got %s", scenario.ExpectedOutput.Originator, got.Originator)
+			}
+			if got.Recipients != scenario.ExpectedOutput.Recipients {
+				t.Errorf("expected recipients to be %s, got %s", scenario.ExpectedOutput.Recipients, got.Recipients)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/ntfy/ntfy.go

@@ -3,50 +3,152 @@ package ntfy
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
 const (
 	DefaultURL      = "https://ntfy.sh"
 	DefaultPriority = 3
+	TokenPrefix     = "tk_"
 )
 
+var (
+	ErrInvalidToken           = errors.New("invalid token")
+	ErrTopicNotSet            = errors.New("topic not set")
+	ErrInvalidPriority        = errors.New("priority must between 1 and 5 inclusively")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	Topic           string `yaml:"topic"`
+	URL             string `yaml:"url,omitempty"`              // Defaults to DefaultURL
+	Priority        int    `yaml:"priority,omitempty"`         // Defaults to DefaultPriority
+	Token           string `yaml:"token,omitempty"`            // Defaults to ""
+	Email           string `yaml:"email,omitempty"`            // Defaults to ""
+	Click           string `yaml:"click,omitempty"`            // Defaults to ""
+	DisableFirebase bool   `yaml:"disable-firebase,omitempty"` // Defaults to false
+	DisableCache    bool   `yaml:"disable-cache,omitempty"`    // Defaults to false
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		cfg.URL = DefaultURL
+	}
+	if cfg.Priority == 0 {
+		cfg.Priority = DefaultPriority
+	}
+	if len(cfg.Token) > 0 && !strings.HasPrefix(cfg.Token, TokenPrefix) {
+		return ErrInvalidToken
+	}
+	if len(cfg.Topic) == 0 {
+		return ErrTopicNotSet
+	}
+	if cfg.Priority < 1 || cfg.Priority > 5 {
+		return ErrInvalidPriority
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.Topic) > 0 {
+		cfg.Topic = override.Topic
+	}
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if override.Priority > 0 {
+		cfg.Priority = override.Priority
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.Email) > 0 {
+		cfg.Email = override.Email
+	}
+	if len(override.Click) > 0 {
+		cfg.Click = override.Click
+	}
+	if override.DisableFirebase {
+		cfg.DisableFirebase = true
+	}
+	if override.DisableCache {
+		cfg.DisableCache = true
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Slack
 type AlertProvider struct {
-	Topic    string `yaml:"topic"`
+	DefaultConfig Config `yaml:",inline"`
-	URL      string `yaml:"url,omitempty"`      // Defaults to DefaultURL
-	Priority int    `yaml:"priority,omitempty"` // Defaults to DefaultPriority
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Override is a case under which the default integration is overridden
-func (provider *AlertProvider) IsValid() bool {
+type Override struct {
-	if len(provider.URL) == 0 {
+	Group  string `yaml:"group"`
-		provider.URL = DefaultURL
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if len(override.Group) == 0 {
+				return ErrDuplicateGroupOverride
+			}
+			if _, ok := registeredGroups[override.Group]; ok {
+				return ErrDuplicateGroupOverride
+			}
+			if len(override.Token) > 0 && !strings.HasPrefix(override.Token, TokenPrefix) {
+				return ErrDuplicateGroupOverride
+			}
+			if override.Priority < 0 || override.Priority >= 6 {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
 	}
-	if provider.Priority == 0 {
+
-		provider.Priority = DefaultPriority
+	return provider.DefaultConfig.Validate()
-	}
-	return len(provider.URL) > 0 && len(provider.Topic) > 0 && provider.Priority > 0 && provider.Priority < 6
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.URL, buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	url := cfg.URL
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
+	if token := cfg.Token; len(token) > 0 {
+		request.Header.Set("Authorization", "Bearer "+token)
+	}
+	if cfg.DisableFirebase {
+		request.Header.Set("Firebase", "no")
+	}
+	if cfg.DisableCache {
+		request.Header.Set("Cache", "no")
+	}
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -65,32 +167,77 @@ type Body struct {
 	Message  string   `json:"message"`
 	Tags     []string `json:"tags"`
 	Priority int      `json:"priority"`
+	Email    string   `json:"email,omitempty"`
+	Click    string   `json:"click,omitempty"`
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	var message, tag string
+	var message, formattedConditionResults, tag string
 	if resolved {
 		tag = "white_check_mark"
 		message = "An alert has been resolved after passing successfully " + strconv.Itoa(alert.SuccessThreshold) + " time(s) in a row"
 	} else {
-		tag = "x"
+		tag = "rotating_light"
 		message = "An alert has been triggered due to having failed " + strconv.Itoa(alert.FailureThreshold) + " time(s) in a row"
 	}
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = "🟢"
+		} else {
+			prefix = "🔴"
+		}
+		formattedConditionResults += fmt.Sprintf("\n%s %s", prefix, conditionResult.Condition)
+	}
 	if len(alert.GetDescription()) > 0 {
 		message += " with the following description: " + alert.GetDescription()
 	}
+	message += formattedConditionResults
 	body, _ := json.Marshal(Body{
-		Topic:    provider.Topic,
+		Topic:    cfg.Topic,
-		Title:    "Gatus: " + endpoint.DisplayName(),
+		Title:    "Gatus: " + ep.DisplayName(),
 		Message:  message,
 		Tags:     []string{tag},
-		Priority: provider.Priority,
+		Priority: cfg.Priority,
+		Email:    cfg.Email,
+		Click:    cfg.Click,
 	})
 	return body
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/ntfy/ntfy_test.go

@@ -2,13 +2,16 @@ package ntfy
 
 import (
 	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
 		name     string
 		provider AlertProvider
@@ -16,39 +19,78 @@ func TestAlertDefaultProvider_IsValid(t *testing.T) {
 	}{
 		{
 			name:     "valid",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1}},
 			expected: true,
 		},
 		{
 			name:     "no-url-should-use-default-value",
-			provider: AlertProvider{Topic: "example", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1}},
 			expected: true,
 		},
+		{
+			name:     "valid-with-token",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1, Token: "tk_faketoken"}},
+			expected: true,
+		},
+		{
+			name:     "invalid-token",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1, Token: "xx_faketoken"}},
+			expected: false,
+		},
 		{
 			name:     "invalid-topic",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "", Priority: 1}},
 			expected: false,
 		},
 		{
 			name:     "invalid-priority-too-high",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 6},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 6}},
 			expected: false,
 		},
 		{
 			name:     "invalid-priority-too-low",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: -1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: -1}},
 			expected: false,
 		},
 		{
 			name:     "no-priority-should-use-default-value",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example"},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example"}},
+			expected: true,
+		},
+		{
+			name:     "invalid-override-token",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g", Config: Config{Token: "xx_faketoken"}}}},
+			expected: false,
+		},
+		{
+			name:     "invalid-override-priority",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g", Config: Config{Priority: 8}}}},
+			expected: false,
+		},
+		{
+			name:     "no-override-group-name",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{}}},
+			expected: false,
+		},
+		{
+			name:     "duplicate-override-group-names",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g"}, {Group: "g"}}},
+			expected: false,
+		},
+		{
+			name:     "valid-override",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g1", Config: Config{Priority: 4, Click: "https://example.com"}}, {Group: "g2", Config: Config{Topic: "Example", Token: "tk_faketoken"}}}},
 			expected: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.name, func(t *testing.T) {
-			if scenario.provider.IsValid() != scenario.expected {
+			err := scenario.provider.Validate()
-				t.Errorf("expected %t, got %t", scenario.expected, scenario.provider.IsValid())
+			if scenario.expected && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			if !scenario.expected && err == nil {
+				t.Error("expected error, got none")
 			}
 		})
 	}
@@ -66,26 +108,59 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
-			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1","tags":["x"],"priority":1}`,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1}`,
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 2},
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 2}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
-			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2","tags":["white_check_mark"],"priority":2}`,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2\n🟢 [CONNECTED] == true\n🟢 [STATUS] == 200","tags":["white_check_mark"],"priority":2}`,
+		},
+		{
+			Name:         "triggered-email",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+		},
+		{
+			Name:         "resolved-email",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 2, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2\n🟢 [CONNECTED] == true\n🟢 [STATUS] == 200","tags":["white_check_mark"],"priority":2,"email":"test@example.com","click":"example.com"}`,
+		},
+		{
+			Name:         "group-override",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 5, Email: "test@example.com", Click: "example.com"}, Overrides: []Override{{Group: "g", Config: Config{Topic: "group-topic", Priority: 4, Email: "override@test.com", Click: "test.com"}}}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"group-topic","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":4,"email":"override@test.com","click":"test.com"}`,
+		},
+		{
+			Name:         "alert-override",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 5, Email: "test@example.com", Click: "example.com"}, Overrides: []Override{{Group: "g", Config: Config{Topic: "group-topic", Priority: 4, Email: "override@test.com", Click: "test.com"}}}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3, ProviderOverride: map[string]any{"topic": "alert-topic"}},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"alert-topic","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":4,"email":"override@test.com","click":"test.com"}`,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("g", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				cfg,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -102,3 +177,238 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		})
 	}
 }
+
+func TestAlertProvider_Send(t *testing.T) {
+	description := "description-1"
+	scenarios := []struct {
+		Name            string
+		Provider        AlertProvider
+		Alert           alert.Alert
+		Resolved        bool
+		Group           string
+		ExpectedBody    string
+		ExpectedHeaders map[string]string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+			},
+		},
+		{
+			Name:         "token",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", Token: "tk_mytoken"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type":  "application/json",
+				"Authorization": "Bearer tk_mytoken",
+			},
+		},
+		{
+			Name:         "no firebase",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableFirebase: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Firebase":     "no",
+			},
+		},
+		{
+			Name:         "no cache",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableCache: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Cache":        "no",
+			},
+		},
+		{
+			Name:         "neither firebase & cache",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableFirebase: true, DisableCache: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Firebase":     "no",
+				"Cache":        "no",
+			},
+		},
+		{
+			Name:         "overrides",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", Token: "tk_mytoken"}, Overrides: []Override{Override{Group: "other-group", Config: Config{URL: "https://example.com", Token: "tk_othertoken"}}, Override{Group: "test-group", Config: Config{Token: "tk_test_token"}}}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "test-group",
+			ExpectedBody: `{"topic":"example","title":"Gatus: test-group/endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type":  "application/json",
+				"Authorization": "Bearer tk_test_token",
+			},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			// Start a local HTTP server
+			server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+				// Test request parameters
+				for header, value := range scenario.ExpectedHeaders {
+					if value != req.Header.Get(header) {
+						t.Errorf("expected: %s, got: %s", value, req.Header.Get(header))
+					}
+				}
+				body, _ := io.ReadAll(req.Body)
+				if string(body) != scenario.ExpectedBody {
+					t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+				}
+				// Send response to be tested
+				rw.Write([]byte(`OK`))
+			}))
+			// Close the server when test finishes
+			defer server.Close()
+
+			scenario.Provider.DefaultConfig.URL = server.URL
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name", Group: scenario.Group},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if err != nil {
+				t.Error("Encountered an error on Send: ", err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"url": "http://alert-example.com", "topic": "alert-topic", "priority": 3}},
+			ExpectedOutput: Config{URL: "http://alert-example.com", Topic: "alert-topic", Priority: 3},
+		},
+		{
+			Name: "provider-with-partial-overrides",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{Topic: "group-topic"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"priority": 3}},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "group-topic", Priority: 3},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.URL != scenario.ExpectedOutput.URL {
+				t.Errorf("expected url %s, got %s", scenario.ExpectedOutput.URL, got.URL)
+			}
+			if got.Topic != scenario.ExpectedOutput.Topic {
+				t.Errorf("expected topic %s, got %s", scenario.ExpectedOutput.Topic, got.Topic)
+			}
+			if got.Priority != scenario.ExpectedOutput.Priority {
+				t.Errorf("expected priority %d, got %d", scenario.ExpectedOutput.Priority, got.Priority)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/opsgenie/opsgenie.go

@@ -3,6 +3,7 @@ package opsgenie
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -11,14 +12,19 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
 const (
 	restAPI = "https://api.opsgenie.com/v2/alerts"
 )
 
-type AlertProvider struct {
+var (
+	ErrAPIKeyNotSet = errors.New("api-key not set")
+)
+
+type Config struct {
 	// APIKey to use for
 	APIKey string `yaml:"api-key"`
 
@@ -46,26 +52,74 @@ type AlertProvider struct {
 	//
 	// default: []
 	Tags []string `yaml:"tags"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.APIKey) == 0 {
+		return ErrAPIKeyNotSet
+	}
+	if len(cfg.Source) == 0 {
+		cfg.Source = "gatus"
+	}
+	if len(cfg.EntityPrefix) == 0 {
+		cfg.EntityPrefix = "gatus-"
+	}
+	if len(cfg.AliasPrefix) == 0 {
+		cfg.AliasPrefix = "gatus-healthcheck-"
+	}
+	if len(cfg.Priority) == 0 {
+		cfg.Priority = "P1"
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.APIKey) > 0 {
+		cfg.APIKey = override.APIKey
+	}
+	if len(override.Priority) > 0 {
+		cfg.Priority = override.Priority
+	}
+	if len(override.Source) > 0 {
+		cfg.Source = override.Source
+	}
+	if len(override.EntityPrefix) > 0 {
+		cfg.EntityPrefix = override.EntityPrefix
+	}
+	if len(override.AliasPrefix) > 0 {
+		cfg.AliasPrefix = override.AliasPrefix
+	}
+	if len(override.Tags) > 0 {
+		cfg.Tags = override.Tags
+	}
+}
+
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	return len(provider.APIKey) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 //
 // Relevant: https://docs.opsgenie.com/docs/alert-api
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	err := provider.createAlert(endpoint, alert, result, resolved)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	err = provider.sendAlertRequest(cfg, ep, alert, result, resolved)
 	if err != nil {
 		return err
 	}
 	if resolved {
-		err = provider.closeAlert(endpoint, alert)
+		err = provider.closeAlert(cfg, ep, alert)
 		if err != nil {
 			return err
 		}
@@ -75,24 +129,24 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 			// The alert has been resolved and there's no error, so we can clear the alert's ResolveKey
 			alert.ResolveKey = ""
 		} else {
-			alert.ResolveKey = provider.alias(buildKey(endpoint))
+			alert.ResolveKey = cfg.AliasPrefix + buildKey(ep)
 		}
 	}
 	return nil
 }
 
-func (provider *AlertProvider) createAlert(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) sendAlertRequest(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	payload := provider.buildCreateRequestBody(endpoint, alert, result, resolved)
+	payload := provider.buildCreateRequestBody(cfg, ep, alert, result, resolved)
-	return provider.sendRequest(restAPI, http.MethodPost, payload)
+	return provider.sendRequest(cfg, restAPI, http.MethodPost, payload)
 }
 
-func (provider *AlertProvider) closeAlert(endpoint *core.Endpoint, alert *alert.Alert) error {
+func (provider *AlertProvider) closeAlert(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert) error {
-	payload := provider.buildCloseRequestBody(endpoint, alert)
+	payload := provider.buildCloseRequestBody(ep, alert)
-	url := restAPI + "/" + provider.alias(buildKey(endpoint)) + "/close?identifierType=alias"
+	url := restAPI + "/" + cfg.AliasPrefix + buildKey(ep) + "/close?identifierType=alias"
-	return provider.sendRequest(url, http.MethodPost, payload)
+	return provider.sendRequest(cfg, url, http.MethodPost, payload)
 }
 
-func (provider *AlertProvider) sendRequest(url, method string, payload interface{}) error {
+func (provider *AlertProvider) sendRequest(cfg *Config, url, method string, payload interface{}) error {
 	body, err := json.Marshal(payload)
 	if err != nil {
 		return fmt.Errorf("error build alert with payload %v: %w", payload, err)
@@ -102,7 +156,7 @@ func (provider *AlertProvider) sendRequest(url, method string, payload interface
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	request.Header.Set("Authorization", "GenieKey "+provider.APIKey)
+	request.Header.Set("Authorization", "GenieKey "+cfg.APIKey)
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -115,18 +169,19 @@ func (provider *AlertProvider) sendRequest(url, method string, payload interface
 	return nil
 }
 
-func (provider *AlertProvider) buildCreateRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) alertCreateRequest {
+func (provider *AlertProvider) buildCreateRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) alertCreateRequest {
-	var message, description, results string
+	var message, description string
 	if resolved {
-		message = fmt.Sprintf("RESOLVED: %s - %s", endpoint.Name, alert.GetDescription())
+		message = fmt.Sprintf("RESOLVED: %s - %s", ep.Name, alert.GetDescription())
-		description = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		description = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 	} else {
-		message = fmt.Sprintf("%s - %s", endpoint.Name, alert.GetDescription())
+		message = fmt.Sprintf("%s - %s", ep.Name, alert.GetDescription())
-		description = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		description = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 	}
-	if endpoint.Group != "" {
+	if ep.Group != "" {
-		message = fmt.Sprintf("[%s] %s", endpoint.Group, message)
+		message = fmt.Sprintf("[%s] %s", ep.Group, message)
 	}
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -134,13 +189,13 @@ func (provider *AlertProvider) buildCreateRequestBody(endpoint *core.Endpoint, a
 		} else {
 			prefix = "▢"
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 	}
-	description = description + "\n" + results
+	description = description + "\n" + formattedConditionResults
-	key := buildKey(endpoint)
+	key := buildKey(ep)
 	details := map[string]string{
-		"endpoint:url":    endpoint.URL,
+		"endpoint:url":    ep.URL,
-		"endpoint:group":  endpoint.Group,
+		"endpoint:group":  ep.Group,
 		"result:hostname": result.Hostname,
 		"result:ip":       result.IP,
 		"result:dns_code": result.DNSRCode,
@@ -157,65 +212,55 @@ func (provider *AlertProvider) buildCreateRequestBody(endpoint *core.Endpoint, a
 	return alertCreateRequest{
 		Message:     message,
 		Description: description,
-		Source:      provider.source(),
+		Source:      cfg.Source,
-		Priority:    provider.priority(),
+		Priority:    cfg.Priority,
-		Alias:       provider.alias(key),
+		Alias:       cfg.AliasPrefix + key,
-		Entity:      provider.entity(key),
+		Entity:      cfg.EntityPrefix + key,
-		Tags:        provider.Tags,
+		Tags:        cfg.Tags,
 		Details:     details,
 	}
 }
 
-func (provider *AlertProvider) buildCloseRequestBody(endpoint *core.Endpoint, alert *alert.Alert) alertCloseRequest {
+func (provider *AlertProvider) buildCloseRequestBody(ep *endpoint.Endpoint, alert *alert.Alert) alertCloseRequest {
 	return alertCloseRequest{
-		Source: buildKey(endpoint),
+		Source: buildKey(ep),
-		Note:   fmt.Sprintf("RESOLVED: %s - %s", endpoint.Name, alert.GetDescription()),
+		Note:   fmt.Sprintf("RESOLVED: %s - %s", ep.Name, alert.GetDescription()),
 	}
 }
 
-func (provider *AlertProvider) source() string {
-	source := provider.Source
-	if source == "" {
-		return "gatus"
-	}
-	return source
-}
-
-func (provider *AlertProvider) alias(key string) string {
-	alias := provider.AliasPrefix
-	if alias == "" {
-		alias = "gatus-healthcheck-"
-	}
-	return alias + key
-}
-
-func (provider *AlertProvider) entity(key string) string {
-	alias := provider.EntityPrefix
-	if alias == "" {
-		alias = "gatus-"
-	}
-	return alias + key
-}
-
-func (provider *AlertProvider) priority() string {
-	priority := provider.Priority
-	if priority == "" {
-		return "P1"
-	}
-	return priority
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
 
-func buildKey(endpoint *core.Endpoint) string {
+// GetConfig returns the configuration for the provider with the overrides applied
-	name := toKebabCase(endpoint.Name)
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
-	if endpoint.Group == "" {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}
+
+func buildKey(ep *endpoint.Endpoint) string {
+	name := toKebabCase(ep.Name)
+	if ep.Group == "" {
 		return name
 	}
-	return toKebabCase(endpoint.Group) + "-" + name
+	return toKebabCase(ep.Group) + "-" + name
 }
 
 func toKebabCase(val string) string {

alerting/provider/opsgenie/opsgenie_test.go

@@ -7,17 +7,17 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{APIKey: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{APIKey: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{APIKey: "00000000-0000-0000-0000-000000000000"}
+	validProvider := AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -35,7 +35,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:          "triggered",
-			Provider:      AlertProvider{},
+			Provider:      AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:         alert.Alert{Description: &description, SuccessThreshold: 1, FailureThreshold: 1},
 			Resolved:      false,
 			ExpectedError: false,
@@ -45,7 +45,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:          "triggered-error",
-			Provider:      AlertProvider{},
+			Provider:      AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:         alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      false,
 			ExpectedError: true,
@@ -55,7 +55,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:          "resolved",
-			Provider:      AlertProvider{},
+			Provider:      AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:         alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      true,
 			ExpectedError: false,
@@ -65,7 +65,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:          "resolved-error",
-			Provider:      AlertProvider{},
+			Provider:      AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:         alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      true,
 			ExpectedError: true,
@@ -74,15 +74,14 @@ func TestAlertProvider_Send(t *testing.T) {
 			}),
 		},
 	}
-
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -106,17 +105,17 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 		Name     string
 		Provider *AlertProvider
 		Alert    *alert.Alert
-		Endpoint *core.Endpoint
+		Endpoint *endpoint.Endpoint
-		Result   *core.Result
+		Result   *endpoint.Result
 		Resolved bool
 		want     alertCreateRequest
 	}{
 		{
 			Name:     "missing all params (unresolved)",
-			Provider: &AlertProvider{},
+			Provider: &AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:    &alert.Alert{},
-			Endpoint: &core.Endpoint{},
+			Endpoint: &endpoint.Endpoint{},
-			Result:   &core.Result{},
+			Result:   &endpoint.Result{},
 			Resolved: false,
 			want: alertCreateRequest{
 				Message:     " - ",
@@ -131,10 +130,10 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 		},
 		{
 			Name:     "missing all params (resolved)",
-			Provider: &AlertProvider{},
+			Provider: &AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert:    &alert.Alert{},
-			Endpoint: &core.Endpoint{},
+			Endpoint: &endpoint.Endpoint{},
-			Result:   &core.Result{},
+			Result:   &endpoint.Result{},
 			Resolved: true,
 			want: alertCreateRequest{
 				Message:     "RESOLVED:  - ",
@@ -149,16 +148,16 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 		},
 		{
 			Name:     "with default options (unresolved)",
-			Provider: &AlertProvider{},
+			Provider: &AlertProvider{DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"}},
 			Alert: &alert.Alert{
 				Description:      &description,
 				FailureThreshold: 3,
 			},
-			Endpoint: &core.Endpoint{
+			Endpoint: &endpoint.Endpoint{
 				Name: "my super app",
 			},
-			Result: &core.Result{
+			Result: &endpoint.Result{
-				ConditionResults: []*core.ConditionResult{
+				ConditionResults: []*endpoint.ConditionResult{
 					{
 						Condition: "[STATUS] == 200",
 						Success:   true,
@@ -184,21 +183,23 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 		{
 			Name: "with custom options (resolved)",
 			Provider: &AlertProvider{
-				Priority:     "P5",
+				DefaultConfig: Config{
-				EntityPrefix: "oompa-",
+					Priority:     "P5",
-				AliasPrefix:  "loompa-",
+					EntityPrefix: "oompa-",
-				Source:       "gatus-hc",
+					AliasPrefix:  "loompa-",
-				Tags:         []string{"do-ba-dee-doo"},
+					Source:       "gatus-hc",
+					Tags:         []string{"do-ba-dee-doo"},
+				},
 			},
 			Alert: &alert.Alert{
 				Description:      &description,
 				SuccessThreshold: 4,
 			},
-			Endpoint: &core.Endpoint{
+			Endpoint: &endpoint.Endpoint{
 				Name: "my mega app",
 			},
-			Result: &core.Result{
+			Result: &endpoint.Result{
-				ConditionResults: []*core.ConditionResult{
+				ConditionResults: []*endpoint.ConditionResult{
 					{
 						Condition: "[STATUS] == 200",
 						Success:   true,
@@ -220,23 +221,23 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 		{
 			Name: "with default options and details (unresolved)",
 			Provider: &AlertProvider{
-				Tags: []string{"foo"},
+				DefaultConfig: Config{Tags: []string{"foo"}, APIKey: "00000000-0000-0000-0000-000000000000"},
 			},
 			Alert: &alert.Alert{
 				Description:      &description,
 				FailureThreshold: 6,
 			},
-			Endpoint: &core.Endpoint{
+			Endpoint: &endpoint.Endpoint{
 				Name:  "my app",
 				Group: "end game",
 				URL:   "https://my.go/app",
 			},
-			Result: &core.Result{
+			Result: &endpoint.Result{
 				HTTPStatus: 400,
 				Hostname:   "my.go",
 				Errors:     []string{"error 01", "error 02"},
 				Success:    false,
-				ConditionResults: []*core.ConditionResult{
+				ConditionResults: []*endpoint.ConditionResult{
 					{
 						Condition: "[STATUS] == 200",
 						Success:   false,
@@ -265,8 +266,9 @@ func TestAlertProvider_buildCreateRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		actual := scenario
 		t.Run(actual.Name, func(t *testing.T) {
-			if got := actual.Provider.buildCreateRequestBody(actual.Endpoint, actual.Alert, actual.Result, actual.Resolved); !reflect.DeepEqual(got, actual.want) {
+			_ = scenario.Provider.Validate()
-				t.Errorf("buildCreateRequestBody() = %v, want %v", got, actual.want)
+			if got := actual.Provider.buildCreateRequestBody(&scenario.Provider.DefaultConfig, actual.Endpoint, actual.Alert, actual.Result, actual.Resolved); !reflect.DeepEqual(got, actual.want) {
+				t.Errorf("got:\n%v\nwant:\n%v", got, actual.want)
 			}
 		})
 	}
@@ -279,14 +281,14 @@ func TestAlertProvider_buildCloseRequestBody(t *testing.T) {
 		Name     string
 		Provider *AlertProvider
 		Alert    *alert.Alert
-		Endpoint *core.Endpoint
+		Endpoint *endpoint.Endpoint
 		want     alertCloseRequest
 	}{
 		{
 			Name:     "Missing all values",
 			Provider: &AlertProvider{},
 			Alert:    &alert.Alert{},
-			Endpoint: &core.Endpoint{},
+			Endpoint: &endpoint.Endpoint{},
 			want: alertCloseRequest{
 				Source: "",
 				Note:   "RESOLVED:  - ",
@@ -298,7 +300,7 @@ func TestAlertProvider_buildCloseRequestBody(t *testing.T) {
 			Alert: &alert.Alert{
 				Description: &description,
 			},
-			Endpoint: &core.Endpoint{
+			Endpoint: &endpoint.Endpoint{
 				Name: "endpoint name",
 			},
 			want: alertCloseRequest{
@@ -307,7 +309,6 @@ func TestAlertProvider_buildCloseRequestBody(t *testing.T) {
 			},
 		},
 	}
-
 	for _, scenario := range scenarios {
 		actual := scenario
 		t.Run(actual.Name, func(t *testing.T) {
@@ -317,3 +318,44 @@ func TestAlertProvider_buildCloseRequestBody(t *testing.T) {
 		})
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{APIKey: "00000000-0000-0000-0000-000000000000"},
+		},
+		{
+			Name: "provider-with-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{APIKey: "00000000-0000-0000-0000-000000000000"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"api-key": "00000000-0000-0000-0000-000000000001"}},
+			ExpectedOutput: Config{APIKey: "00000000-0000-0000-0000-000000000001"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.APIKey != scenario.ExpectedOutput.APIKey {
+				t.Errorf("expected APIKey to be %s, got %s", scenario.ExpectedOutput.APIKey, got.APIKey)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/pagerduty/pagerduty.go

@@ -3,23 +3,47 @@ package pagerduty
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/logr"
+	"gopkg.in/yaml.v3"
 )
 
 const (
 	restAPIURL = "https://events.pagerduty.com/v2/enqueue"
 )
 
+var (
+	ErrIntegrationKeyNotSet   = errors.New("integration-key must have exactly 32 characters")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	IntegrationKey string `yaml:"integration-key"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.IntegrationKey) != 32 {
+		return ErrIntegrationKeyNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.IntegrationKey) > 0 {
+		cfg.IntegrationKey = override.IntegrationKey
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using PagerDuty
 type AlertProvider struct {
-	IntegrationKey string `yaml:"integration-key"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -30,30 +54,34 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group          string `yaml:"group"`
+	Group  string `yaml:"group"`
-	IntegrationKey string `yaml:"integration-key"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
-			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.IntegrationKey) != 32 {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
 	// Either the default integration key has the right length, or there are overrides who are properly configured.
-	return len(provider.IntegrationKey) == 32 || len(provider.Overrides) != 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 //
 // Relevant: https://developer.pagerduty.com/docs/events-api-v2/trigger-events/
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
 	request, err := http.NewRequest(http.MethodPost, restAPIURL, buffer)
 	if err != nil {
 		return err
@@ -74,11 +102,10 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 			alert.ResolveKey = ""
 		} else {
 			// We need to retrieve the resolve key from the response
-			body, err := io.ReadAll(response.Body)
 			var payload pagerDutyResponsePayload
-			if err = json.Unmarshal(body, &payload); err != nil {
+			if err = json.NewDecoder(response.Body).Decode(&payload); err != nil {
 				// Silently fail. We don't want to create tons of alerts just because we failed to parse the body.
-				log.Printf("[pagerduty][Send] Ran into error unmarshaling pagerduty response: %s", err.Error())
+				logr.Errorf("[pagerduty.Send] Ran into error decoding pagerduty response: %s", err.Error())
 			} else {
 				alert.ResolveKey = payload.DedupKey
 			}
@@ -101,19 +128,19 @@ type Payload struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message, eventAction, resolveKey string
 	if resolved {
-		message = fmt.Sprintf("RESOLVED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("RESOLVED: %s - %s", ep.DisplayName(), alert.GetDescription())
 		eventAction = "resolve"
 		resolveKey = alert.ResolveKey
 	} else {
-		message = fmt.Sprintf("TRIGGERED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("TRIGGERED: %s - %s", ep.DisplayName(), alert.GetDescription())
 		eventAction = "trigger"
 		resolveKey = ""
 	}
 	body, _ := json.Marshal(Body{
-		RoutingKey:  provider.getIntegrationKeyForGroup(endpoint.Group),
+		RoutingKey:  cfg.IntegrationKey,
 		DedupKey:    resolveKey,
 		EventAction: eventAction,
 		Payload: Payload{
@@ -125,21 +152,40 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 	return body
 }
 
-// getIntegrationKeyForGroup returns the appropriate pagerduty integration key for a given group
+// GetDefaultAlert returns the provider's default alert configuration
-func (provider *AlertProvider) getIntegrationKeyForGroup(group string) string {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if group == override.Group {
-				return override.IntegrationKey
+				cfg.Merge(&override.Config)
+				break
 			}
 		}
 	}
-	return provider.IntegrationKey
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
 }
 
-// GetDefaultAlert returns the provider's default alert configuration
+// ValidateOverrides validates the alert's provider override and, if present, the group override
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
-	return provider.DefaultAlert
+	_, err := provider.GetConfig(group, alert)
+	return err
 }
 
 type pagerDutyResponsePayload struct {

alerting/provider/pagerduty/pagerduty_test.go

@@ -7,54 +7,45 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{IntegrationKey: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{IntegrationKey: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{IntegrationKey: "00000000000000000000000000000000"}
+	validProvider := AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
+		DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
 		Overrides: []Override{
 			{
-				IntegrationKey: "00000000000000000000000000000000",
+				Config: Config{IntegrationKey: "00000000000000000000000000000002"},
-				Group:          "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
-	providerWithInvalidOverrideIntegrationKey := AlertProvider{
-		Overrides: []Override{
-			{
-				IntegrationKey: "",
-				Group:          "group",
-			},
-		},
-	}
-	if providerWithInvalidOverrideIntegrationKey.IsValid() {
-		t.Error("provider integration key shouldn't have been valid")
-	}
 	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
 		Overrides: []Override{
 			{
-				IntegrationKey: "00000000000000000000000000000000",
+				Config: Config{IntegrationKey: "00000000000000000000000000000002"},
-				Group:          "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
-		t.Error("provider should've been valid")
+		t.Error("provider should've been valid, got error:", err.Error())
 	}
 }
 
@@ -72,7 +63,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -82,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -92,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -102,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -115,10 +106,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -146,14 +137,14 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{IntegrationKey: "00000000000000000000000000000000"},
+			Provider:     AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:        alert.Alert{Description: &description},
 			Resolved:     false,
 			ExpectedBody: "{\"routing_key\":\"00000000000000000000000000000000\",\"dedup_key\":\"\",\"event_action\":\"trigger\",\"payload\":{\"summary\":\"TRIGGERED: endpoint-name - test\",\"source\":\"Gatus\",\"severity\":\"critical\"}}",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{IntegrationKey: "00000000000000000000000000000000"},
+			Provider:     AlertProvider{DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000000"}},
 			Alert:        alert.Alert{Description: &description, ResolveKey: "key"},
 			Resolved:     true,
 			ExpectedBody: "{\"routing_key\":\"00000000000000000000000000000000\",\"dedup_key\":\"key\",\"event_action\":\"resolve\",\"payload\":{\"summary\":\"RESOLVED: endpoint-name - test\",\"source\":\"Gatus\",\"severity\":\"critical\"}}",
@@ -161,7 +152,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			body := scenario.Provider.buildRequestBody(&core.Endpoint{Name: "endpoint-name"}, &scenario.Alert, &core.Result{}, scenario.Resolved)
+			body := scenario.Provider.buildRequestBody(&scenario.Provider.DefaultConfig, &endpoint.Endpoint{Name: "endpoint-name"}, &scenario.Alert, &endpoint.Result{}, scenario.Resolved)
 			if string(body) != scenario.ExpectedBody {
 				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
 			}
@@ -173,74 +164,102 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getIntegrationKeyForGroup(t *testing.T) {
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
 	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				IntegrationKey: "00000000000000000000000000000001",
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
-				Overrides:      nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "00000000000000000000000000000001",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				IntegrationKey: "00000000000000000000000000000001",
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
-				Overrides:      nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "00000000000000000000000000000001",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				IntegrationKey: "00000000000000000000000000000001",
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
 				Overrides: []Override{
 					{
-						Group:          "group",
+						Group:  "group",
-						IntegrationKey: "00000000000000000000000000000002",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "00000000000000000000000000000001",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				IntegrationKey: "00000000000000000000000000000001",
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
 				Overrides: []Override{
 					{
-						Group:          "group",
+						Group:  "group",
-						IntegrationKey: "00000000000000000000000000000002",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "00000000000000000000000000000002",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000002"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"integration-key": "00000000000000000000000000000003"}},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000003"},
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			if output := scenario.Provider.getIntegrationKeyForGroup(scenario.InputGroup); output != scenario.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("expected %s, got %s", scenario.ExpectedOutput, output)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.IntegrationKey != scenario.ExpectedOutput.IntegrationKey {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.IntegrationKey, got.IntegrationKey)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}
 }
-
-func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
-		t.Error("expected default alert to be not nil")
-	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
-		t.Error("expected default alert to be nil")
-	}
-}

alerting/provider/provider.go

@@ -2,11 +2,15 @@ package provider
 
 import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/alerting/provider/awsses"
 	"github.com/TwiN/gatus/v5/alerting/provider/custom"
 	"github.com/TwiN/gatus/v5/alerting/provider/discord"
 	"github.com/TwiN/gatus/v5/alerting/provider/email"
+	"github.com/TwiN/gatus/v5/alerting/provider/gitea"
 	"github.com/TwiN/gatus/v5/alerting/provider/github"
+	"github.com/TwiN/gatus/v5/alerting/provider/gitlab"
 	"github.com/TwiN/gatus/v5/alerting/provider/googlechat"
+	"github.com/TwiN/gatus/v5/alerting/provider/jetbrainsspace"
 	"github.com/TwiN/gatus/v5/alerting/provider/matrix"
 	"github.com/TwiN/gatus/v5/alerting/provider/mattermost"
 	"github.com/TwiN/gatus/v5/alerting/provider/messagebird"
@@ -16,25 +20,35 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/provider/pushover"
 	"github.com/TwiN/gatus/v5/alerting/provider/slack"
 	"github.com/TwiN/gatus/v5/alerting/provider/teams"
+	"github.com/TwiN/gatus/v5/alerting/provider/teamsworkflows"
 	"github.com/TwiN/gatus/v5/alerting/provider/telegram"
 	"github.com/TwiN/gatus/v5/alerting/provider/twilio"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/alerting/provider/zulip"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-// AlertProvider is the interface that each providers should implement
+// AlertProvider is the interface that each provider should implement
 type AlertProvider interface {
-	// IsValid returns whether the provider's configuration is valid
+	// Validate the provider's configuration
-	IsValid() bool
+	Validate() error
+
+	// Send an alert using the provider
+	Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error
 
 	// GetDefaultAlert returns the provider's default alert configuration
 	GetDefaultAlert() *alert.Alert
 
-	// Send an alert using the provider
+	// ValidateOverrides validates the alert's provider override and, if present, the group override
-	Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error
+	ValidateOverrides(group string, alert *alert.Alert) error
 }
 
-// ParseWithDefaultAlert parses an Endpoint alert by using the provider's default alert as a baseline
+type Config[T any] interface {
-func ParseWithDefaultAlert(providerDefaultAlert, endpointAlert *alert.Alert) {
+	Validate() error
+	Merge(override *T)
+}
+
+// MergeProviderDefaultAlertIntoEndpointAlert parses an Endpoint alert by using the provider's default alert as a baseline
+func MergeProviderDefaultAlertIntoEndpointAlert(providerDefaultAlert, endpointAlert *alert.Alert) {
 	if providerDefaultAlert == nil || endpointAlert == nil {
 		return
 	}
@@ -56,12 +70,16 @@ func ParseWithDefaultAlert(providerDefaultAlert, endpointAlert *alert.Alert) {
 }
 
 var (
-	// Validate interface implementation on compile
+	// Validate provider interface implementation on compile
+	_ AlertProvider = (*awsses.AlertProvider)(nil)
 	_ AlertProvider = (*custom.AlertProvider)(nil)
 	_ AlertProvider = (*discord.AlertProvider)(nil)
 	_ AlertProvider = (*email.AlertProvider)(nil)
+	_ AlertProvider = (*gitea.AlertProvider)(nil)
 	_ AlertProvider = (*github.AlertProvider)(nil)
+	_ AlertProvider = (*gitlab.AlertProvider)(nil)
 	_ AlertProvider = (*googlechat.AlertProvider)(nil)
+	_ AlertProvider = (*jetbrainsspace.AlertProvider)(nil)
 	_ AlertProvider = (*matrix.AlertProvider)(nil)
 	_ AlertProvider = (*mattermost.AlertProvider)(nil)
 	_ AlertProvider = (*messagebird.AlertProvider)(nil)
@@ -71,6 +89,32 @@ var (
 	_ AlertProvider = (*pushover.AlertProvider)(nil)
 	_ AlertProvider = (*slack.AlertProvider)(nil)
 	_ AlertProvider = (*teams.AlertProvider)(nil)
+	_ AlertProvider = (*teamsworkflows.AlertProvider)(nil)
 	_ AlertProvider = (*telegram.AlertProvider)(nil)
 	_ AlertProvider = (*twilio.AlertProvider)(nil)
+	_ AlertProvider = (*zulip.AlertProvider)(nil)
+
+	// Validate config interface implementation on compile
+	_ Config[awsses.Config]         = (*awsses.Config)(nil)
+	_ Config[custom.Config]         = (*custom.Config)(nil)
+	_ Config[discord.Config]        = (*discord.Config)(nil)
+	_ Config[email.Config]          = (*email.Config)(nil)
+	_ Config[gitea.Config]          = (*gitea.Config)(nil)
+	_ Config[github.Config]         = (*github.Config)(nil)
+	_ Config[gitlab.Config]         = (*gitlab.Config)(nil)
+	_ Config[googlechat.Config]     = (*googlechat.Config)(nil)
+	_ Config[jetbrainsspace.Config] = (*jetbrainsspace.Config)(nil)
+	_ Config[matrix.Config]         = (*matrix.Config)(nil)
+	_ Config[mattermost.Config]     = (*mattermost.Config)(nil)
+	_ Config[messagebird.Config]    = (*messagebird.Config)(nil)
+	_ Config[ntfy.Config]           = (*ntfy.Config)(nil)
+	_ Config[opsgenie.Config]       = (*opsgenie.Config)(nil)
+	_ Config[pagerduty.Config]      = (*pagerduty.Config)(nil)
+	_ Config[pushover.Config]       = (*pushover.Config)(nil)
+	_ Config[slack.Config]          = (*slack.Config)(nil)
+	_ Config[teams.Config]          = (*teams.Config)(nil)
+	_ Config[teamsworkflows.Config] = (*teamsworkflows.Config)(nil)
+	_ Config[telegram.Config]       = (*telegram.Config)(nil)
+	_ Config[twilio.Config]         = (*twilio.Config)(nil)
+	_ Config[zulip.Config]          = (*zulip.Config)(nil)
 )

alerting/provider/provider_test.go

@@ -126,7 +126,7 @@ func TestParseWithDefaultAlert(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			ParseWithDefaultAlert(scenario.DefaultAlert, scenario.EndpointAlert)
+			MergeProviderDefaultAlertIntoEndpointAlert(scenario.DefaultAlert, scenario.EndpointAlert)
 			if scenario.ExpectedOutputAlert == nil {
 				if scenario.EndpointAlert != nil {
 					t.Fail()

alerting/provider/pushover/pushover.go

@@ -3,13 +3,15 @@ package pushover
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
 const (
@@ -17,8 +19,13 @@ const (
 	defaultPriority = 0
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Pushover
+var (
-type AlertProvider struct {
+	ErrInvalidApplicationToken = errors.New("application-token must be 30 characters long")
+	ErrInvalidUserKey          = errors.New("user-key must be 30 characters long")
+	ErrInvalidPriority         = errors.New("priority and resolved-priority must be between -2 and 2")
+)
+
+type Config struct {
 	// Key used to authenticate the application sending
 	// See "Your Applications" on the dashboard, or add a new one: https://pushover.net/apps/build
 	ApplicationToken string `yaml:"application-token"`
@@ -34,26 +41,76 @@ type AlertProvider struct {
 	// default: 0
 	Priority int `yaml:"priority,omitempty"`
 
+	// Priority of resolved messages, ranging from -2 (very low) to 2 (Emergency)
+	// default: 0
+	ResolvedPriority int `yaml:"resolved-priority,omitempty"`
+
 	// Sound of the messages (see: https://pushover.net/api#sounds)
 	// default: "" (pushover)
 	Sound string `yaml:"sound,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if cfg.Priority == 0 {
+		cfg.Priority = defaultPriority
+	}
+	if cfg.ResolvedPriority == 0 {
+		cfg.ResolvedPriority = defaultPriority
+	}
+	if len(cfg.ApplicationToken) != 30 {
+		return ErrInvalidApplicationToken
+	}
+	if len(cfg.UserKey) != 30 {
+		return ErrInvalidUserKey
+	}
+	if cfg.Priority < -2 || cfg.Priority > 2 || cfg.ResolvedPriority < -2 || cfg.ResolvedPriority > 2 {
+		return ErrInvalidPriority
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ApplicationToken) > 0 {
+		cfg.ApplicationToken = override.ApplicationToken
+	}
+	if len(override.UserKey) > 0 {
+		cfg.UserKey = override.UserKey
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+	if override.Priority != 0 {
+		cfg.Priority = override.Priority
+	}
+	if override.ResolvedPriority != 0 {
+		cfg.ResolvedPriority = override.ResolvedPriority
+	}
+	if len(override.Sound) > 0 {
+		cfg.Sound = override.Sound
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Pushover
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	if provider.Priority == 0 {
+	return provider.DefaultConfig.Validate()
-		provider.Priority = defaultPriority
-	}
-	return len(provider.ApplicationToken) == 30 && len(provider.UserKey) == 30 && provider.Priority >= -2 && provider.Priority <= 2
 }
 
 // Send an alert using the provider
 // Reference doc for pushover: https://pushover.net/api
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
 	request, err := http.NewRequest(http.MethodPost, restAPIURL, buffer)
 	if err != nil {
 		return err
@@ -81,32 +138,51 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message string
 	if resolved {
-		message = fmt.Sprintf("RESOLVED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("RESOLVED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	} else {
-		message = fmt.Sprintf("TRIGGERED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("TRIGGERED: %s - %s", ep.DisplayName(), alert.GetDescription())
+	}
+	priority := cfg.Priority
+	if resolved {
+		priority = cfg.ResolvedPriority
 	}
 	body, _ := json.Marshal(Body{
-		Token:    provider.ApplicationToken,
+		Token:    cfg.ApplicationToken,
-		User:     provider.UserKey,
+		User:     cfg.UserKey,
-		Title:    provider.Title,
+		Title:    cfg.Title,
 		Message:  message,
-		Priority: provider.priority(),
+		Priority: priority,
-		Sound:    provider.Sound,
+		Sound:    cfg.Sound,
 	})
 	return body
 }
 
-func (provider *AlertProvider) priority() int {
-	if provider.Priority == 0 {
-		return defaultPriority
-	}
-	return provider.Priority
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/pushover/pushover_test.go

@@ -7,35 +7,43 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
 func TestPushoverAlertProvider_IsValid(t *testing.T) {
-	invalidProvider := AlertProvider{}
+	t.Run("empty-invalid-provider", func(t *testing.T) {
-	if invalidProvider.IsValid() {
+		invalidProvider := AlertProvider{}
-		t.Error("provider shouldn't have been valid")
+		if err := invalidProvider.Validate(); err == nil {
-	}
+			t.Error("provider shouldn't have been valid")
-	validProvider := AlertProvider{
+		}
-		ApplicationToken: "aTokenWithLengthOf30characters",
+	})
-		UserKey:          "aTokenWithLengthOf30characters",
+	t.Run("valid-provider", func(t *testing.T) {
-		Title:            "Gatus Notification",
+		validProvider := AlertProvider{
-		Priority:         1,
+			DefaultConfig: Config{
-	}
+				ApplicationToken: "aTokenWithLengthOf30characters",
-	if !validProvider.IsValid() {
+				UserKey:          "aTokenWithLengthOf30characters",
-		t.Error("provider should've been valid")
+				Title:            "Gatus Notification",
-	}
+				Priority:         1,
-}
+				ResolvedPriority: 1,
-
+			},
-func TestPushoverAlertProvider_IsInvalid(t *testing.T) {
+		}
-	invalidProvider := AlertProvider{
+		if err := validProvider.Validate(); err != nil {
-		ApplicationToken: "aTokenWithLengthOfMoreThan30characters",
+			t.Error("provider should've been valid")
-		UserKey:          "aTokenWithLengthOfMoreThan30characters",
+		}
-		Priority:         5,
+	})
-	}
+	t.Run("invalid-provider", func(t *testing.T) {
-	if invalidProvider.IsValid() {
+		invalidProvider := AlertProvider{
-		t.Error("provider should've been invalid")
+			DefaultConfig: Config{
-	}
+				ApplicationToken: "aTokenWithLengthOfMoreThan30characters",
+				UserKey:          "aTokenWithLengthOfMoreThan30characters",
+				Priority:         5,
+			},
+		}
+		if err := invalidProvider.Validate(); err == nil {
+			t.Error("provider should've been invalid")
+		}
+	})
 }
 
 func TestAlertProvider_Send(t *testing.T) {
@@ -52,7 +60,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -62,7 +70,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -72,7 +80,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -82,7 +90,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -95,10 +103,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -119,29 +127,37 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	firstDescription := "description-1"
 	secondDescription := "description-2"
 	scenarios := []struct {
-		Name         string
+		Name             string
-		Provider     AlertProvider
+		Provider         AlertProvider
-		Alert        alert.Alert
+		Alert            alert.Alert
-		Resolved     bool
+		Resolved         bool
-		ExpectedBody string
+		ResolvedPriority bool
+		ExpectedBody     string
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{ApplicationToken: "TokenWithLengthOf30Characters1", UserKey: "TokenWithLengthOf30Characters4"},
+			Provider:     AlertProvider{DefaultConfig: Config{ApplicationToken: "TokenWithLengthOf30Characters1", UserKey: "TokenWithLengthOf30Characters4"}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"token\":\"TokenWithLengthOf30Characters1\",\"user\":\"TokenWithLengthOf30Characters4\",\"message\":\"TRIGGERED: endpoint-name - description-1\",\"priority\":0}",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters5", Title: "Gatus Notifications", Priority: 2},
+			Provider:     AlertProvider{DefaultConfig: Config{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters5", Title: "Gatus Notifications", Priority: 2, ResolvedPriority: 2}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"token\":\"TokenWithLengthOf30Characters2\",\"user\":\"TokenWithLengthOf30Characters5\",\"title\":\"Gatus Notifications\",\"message\":\"RESOLVED: endpoint-name - description-2\",\"priority\":2}",
 		},
+		{
+			Name:         "resolved-priority",
+			Provider:     AlertProvider{DefaultConfig: Config{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters5", Title: "Gatus Notifications", Priority: 2, ResolvedPriority: 0}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"token\":\"TokenWithLengthOf30Characters2\",\"user\":\"TokenWithLengthOf30Characters5\",\"title\":\"Gatus Notifications\",\"message\":\"RESOLVED: endpoint-name - description-2\",\"priority\":0}",
+		},
 		{
 			Name:         "with-sound",
-			Provider:     AlertProvider{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters5", Title: "Gatus Notifications", Priority: 2, Sound: "falling"},
+			Provider:     AlertProvider{DefaultConfig: Config{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters5", Title: "Gatus Notifications", Priority: 2, ResolvedPriority: 2, Sound: "falling"}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"token\":\"TokenWithLengthOf30Characters2\",\"user\":\"TokenWithLengthOf30Characters5\",\"title\":\"Gatus Notifications\",\"message\":\"RESOLVED: endpoint-name - description-2\",\"priority\":2,\"sound\":\"falling\"}",
@@ -150,10 +166,11 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -172,10 +189,57 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ApplicationToken: "aTokenWithLengthOf30characters", UserKey: "aTokenWithLengthOf30characters"},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"application-token": "TokenWithLengthOf30Characters2", "user-key": "TokenWithLengthOf30Characters3"}},
+			ExpectedOutput: Config{ApplicationToken: "TokenWithLengthOf30Characters2", UserKey: "TokenWithLengthOf30Characters3"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.ApplicationToken != scenario.ExpectedOutput.ApplicationToken {
+				t.Errorf("expected application token to be %s, got %s", scenario.ExpectedOutput.ApplicationToken, got.ApplicationToken)
+			}
+			if got.UserKey != scenario.ExpectedOutput.UserKey {
+				t.Errorf("expected user key to be %s, got %s", scenario.ExpectedOutput.UserKey, got.UserKey)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/slack/slack.go

@@ -3,48 +3,78 @@ package slack
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL string `yaml:"webhook-url"` // Slack webhook URL
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Slack
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"` // Slack webhook URL
+	DefaultConfig Config `yaml:",inline"`
+
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
 	// Overrides is a list of Override that may be prioritized over the default configuration
 	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
+	Group  string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
-			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
@@ -71,7 +101,7 @@ type Attachment struct {
 	Text   string  `json:"text"`
 	Short  bool    `json:"short"`
 	Color  string  `json:"color"`
-	Fields []Field `json:"fields"`
+	Fields []Field `json:"fields,omitempty"`
 }
 
 type Field struct {
@@ -81,15 +111,16 @@ type Field struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	var message, color, results string
+	var message, color string
 	if resolved {
-		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 		color = "#36A64F"
 	} else {
-		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 		color = "#DD0000"
 	}
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -97,13 +128,13 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		} else {
 			prefix = ":x:"
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = ":\n> " + alertDescription
 	}
-	body, _ := json.Marshal(Body{
+	body := Body{
 		Text: "",
 		Attachments: []Attachment{
 			{
@@ -111,32 +142,52 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 				Text:  message + description,
 				Short: false,
 				Color: color,
-				Fields: []Field{
-					{
-						Title: "Condition results",
-						Value: results,
-						Short: false,
-					},
-				},
 			},
 		},
-	})
-	return body
-}
-
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
 	}
-	return provider.WebhookURL
+	if len(formattedConditionResults) > 0 {
+		body.Attachments[0].Fields = append(body.Attachments[0].Fields, Field{
+			Title: "Condition results",
+			Value: formattedConditionResults,
+			Short: false,
+		})
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/slack/slack_test.go

@@ -7,54 +7,54 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "https://example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "https://example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
+				Config: Config{WebhookURL: ""},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -73,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -93,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -103,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -116,10 +116,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -142,15 +142,16 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	scenarios := []struct {
 		Name         string
 		Provider     AlertProvider
-		Endpoint     core.Endpoint
+		Endpoint     endpoint.Endpoint
 		Alert        alert.Alert
+		NoConditions bool
 		Resolved     bool
 		ExpectedBody string
 	}{
 		{
 			Name:         "triggered",
 			Provider:     AlertProvider{},
-			Endpoint:     core.Endpoint{Name: "name"},
+			Endpoint:     endpoint.Endpoint{Name: "name"},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"text\":\"\",\"attachments\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"text\":\"An alert for *name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"short\":false,\"color\":\"#DD0000\",\"fields\":[{\"title\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n\",\"short\":false}]}]}",
@@ -158,15 +159,24 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		{
 			Name:         "triggered-with-group",
 			Provider:     AlertProvider{},
-			Endpoint:     core.Endpoint{Name: "name", Group: "group"},
+			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"text\":\"\",\"attachments\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"text\":\"An alert for *group/name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"short\":false,\"color\":\"#DD0000\",\"fields\":[{\"title\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n\",\"short\":false}]}]}",
 		},
+		{
+			Name:         "triggered-with-no-conditions",
+			NoConditions: true,
+			Provider:     AlertProvider{},
+			Endpoint:     endpoint.Endpoint{Name: "name"},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"text\":\"\",\"attachments\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"text\":\"An alert for *name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"short\":false,\"color\":\"#DD0000\"}]}",
+		},
 		{
 			Name:         "resolved",
 			Provider:     AlertProvider{},
-			Endpoint:     core.Endpoint{Name: "name"},
+			Endpoint:     endpoint.Endpoint{Name: "name"},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"text\":\"\",\"attachments\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"text\":\"An alert for *name* has been resolved after passing successfully 5 time(s) in a row:\\n\\u003e description-2\",\"short\":false,\"color\":\"#36A64F\",\"fields\":[{\"title\":\"Condition results\",\"value\":\":white_check_mark: - `[CONNECTED] == true`\\n:white_check_mark: - `[STATUS] == 200`\\n\",\"short\":false}]}]}",
@@ -174,7 +184,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		{
 			Name:         "resolved-with-group",
 			Provider:     AlertProvider{},
-			Endpoint:     core.Endpoint{Name: "name", Group: "group"},
+			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"text\":\"\",\"attachments\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"text\":\"An alert for *group/name* has been resolved after passing successfully 5 time(s) in a row:\\n\\u003e description-2\",\"short\":false,\"color\":\"#36A64F\",\"fields\":[{\"title\":\"Condition results\",\"value\":\":white_check_mark: - `[CONNECTED] == true`\\n:white_check_mark: - `[STATUS] == 200`\\n\",\"short\":false}]}]}",
@@ -182,14 +192,18 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+				}
+			}
 			body := scenario.Provider.buildRequestBody(
 				&scenario.Endpoint,
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: conditionResults,
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-					},
 				},
 				scenario.Resolved,
 			)
@@ -205,72 +219,100 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getWebhookURLForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/teams/teams.go

@@ -3,18 +3,52 @@ package teams
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL string `yaml:"webhook-url"`
+	Title      string `yaml:"title,omitempty"` // Title of the message that will be sent
+
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Teams
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -25,33 +59,37 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
+	Group  string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
-			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(nil).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -69,7 +107,7 @@ type Body struct {
 	ThemeColor string    `json:"themeColor"`
 	Title      string    `json:"title"`
 	Text       string    `json:"text"`
-	Sections   []Section `json:"sections"`
+	Sections   []Section `json:"sections,omitempty"`
 }
 
 type Section struct {
@@ -78,16 +116,16 @@ type Section struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message, color string
 	if resolved {
-		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
 		color = "#36A64F"
 	} else {
-		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
 		color = "#DD0000"
 	}
-	var results string
+	var formattedConditionResults string
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
@@ -95,41 +133,64 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		} else {
 			prefix = "❌"
 		}
-		results += fmt.Sprintf("%s - `%s`<br/>", prefix, conditionResult.Condition)
+		formattedConditionResults += fmt.Sprintf("%s - `%s`<br/>", prefix, conditionResult.Condition)
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = ": " + alertDescription
 	}
-	body, _ := json.Marshal(Body{
+	body := Body{
 		Type:       "MessageCard",
 		Context:    "http://schema.org/extensions",
 		ThemeColor: color,
-		Title:      "&#x1F6A8; Gatus",
+		Title:      cfg.Title,
 		Text:       message + description,
-		Sections: []Section{
-			{
-				ActivityTitle: "Condition results",
-				Text:          results,
-			},
-		},
-	})
-	return body
-}
-
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
 	}
-	return provider.WebhookURL
+	if len(body.Title) == 0 {
+		body.Title = "&#x1F6A8; Gatus"
+	}
+	if len(formattedConditionResults) > 0 {
+		body.Sections = append(body.Sections, Section{
+			ActivityTitle: "Condition results",
+			Text:          formattedConditionResults,
+		})
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/teams/teams_test.go

@@ -7,54 +7,54 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "",
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
+				Config: Config{WebhookURL: ""},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
+				Config: Config{WebhookURL: "http://example.com"},
-				Group:      "group",
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -73,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -93,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -103,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -116,10 +116,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -143,6 +143,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		Name         string
 		Provider     AlertProvider
 		Alert        alert.Alert
+		NoConditions bool
 		Resolved     bool
 		ExpectedBody string
 	}{
@@ -160,18 +161,29 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 			Resolved:     true,
 			ExpectedBody: "{\"@type\":\"MessageCard\",\"@context\":\"http://schema.org/extensions\",\"themeColor\":\"#36A64F\",\"title\":\"\\u0026#x1F6A8; Gatus\",\"text\":\"An alert for *endpoint-name* has been resolved after passing successfully 5 time(s) in a row: description-2\",\"sections\":[{\"activityTitle\":\"Condition results\",\"text\":\"\\u0026#x2705; - `[CONNECTED] == true`\\u003cbr/\\u003e\\u0026#x2705; - `[STATUS] == 200`\\u003cbr/\\u003e\"}]}",
 		},
+		{
+			Name:         "resolved-with-no-conditions",
+			NoConditions: true,
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"@type\":\"MessageCard\",\"@context\":\"http://schema.org/extensions\",\"themeColor\":\"#36A64F\",\"title\":\"\\u0026#x1F6A8; Gatus\",\"text\":\"An alert for *endpoint-name* has been resolved after passing successfully 5 time(s) in a row: description-2\"}",
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+				}
+			}
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{ConditionResults: conditionResults},
-					ConditionResults: []*core.ConditionResult{
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-					},
-				},
 				scenario.Resolved,
 			)
 			if string(body) != scenario.ExpectedBody {
@@ -186,72 +198,100 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
+func TestAlertProvider_GetConfig(t *testing.T) {
-	tests := []struct {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
-				Overrides:  nil,
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
+						Group:  "group",
-						WebhookURL: "http://example01.com",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
+	for _, scenario := range scenarios {
-		t.Run(tt.Name, func(t *testing.T) {
+		t.Run(scenario.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/teamsworkflows/teamsworkflows.go

@@ -0,0 +1,255 @@
+package teamsworkflows
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL string `yaml:"webhook-url"`
+	Title      string `yaml:"title,omitempty"` // Title of the message that will be sent
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Teams
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+// AdaptiveCardBody represents the structure of an Adaptive Card
+type AdaptiveCardBody struct {
+	Type    string      `json:"type"`
+	Version string      `json:"version"`
+	Body    []CardBody  `json:"body"`
+	MSTeams MSTeamsBody `json:"msteams"`
+}
+
+// CardBody represents the body of the Adaptive Card
+type CardBody struct {
+	Type      string       `json:"type"`
+	Text      string       `json:"text,omitempty"`
+	Wrap      bool         `json:"wrap"`
+	Separator bool         `json:"separator,omitempty"`
+	Size      string       `json:"size,omitempty"`
+	Weight    string       `json:"weight,omitempty"`
+	Items     []CardBody   `json:"items,omitempty"`
+	Facts     []Fact       `json:"facts,omitempty"`
+	FactSet   *FactSetBody `json:"factSet,omitempty"`
+	Style     string       `json:"style,omitempty"`
+}
+
+// MSTeamsBody represents the msteams options
+type MSTeamsBody struct {
+	Width string `json:"width"`
+}
+
+// FactSetBody represents the FactSet in the Adaptive Card
+type FactSetBody struct {
+	Type  string `json:"type"`
+	Facts []Fact `json:"facts"`
+}
+
+// Fact represents an individual fact in the FactSet
+type Fact struct {
+	Title string `json:"title"`
+	Value string `json:"value"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	var message string
+	var themeColor string
+	if resolved {
+		message = fmt.Sprintf("An alert for **%s** has been resolved after passing successfully %d time(s) in a row.", ep.DisplayName(), alert.SuccessThreshold)
+		themeColor = "Good" // green
+	} else {
+		message = fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row.", ep.DisplayName(), alert.FailureThreshold)
+		themeColor = "Attention" // red
+	}
+
+	// Configure default title if it's not provided
+	title := "⛑ Gatus"
+	if cfg.Title != "" {
+		title = cfg.Title
+	}
+
+	// Build the facts from the condition results
+	var facts []Fact
+	for _, conditionResult := range result.ConditionResults {
+		var key string
+		if conditionResult.Success {
+			key = "✅"
+		} else {
+			key = "❌"
+		}
+		facts = append(facts, Fact{
+			Title: key,
+			Value: conditionResult.Condition,
+		})
+	}
+
+	cardContent := AdaptiveCardBody{
+		Type:    "AdaptiveCard",
+		Version: "1.4", // Version 1.5 and 1.6 doesn't seem to be supported by Teams as of 27/08/2024
+		Body: []CardBody{
+			{
+				Type:  "Container",
+				Style: themeColor,
+				Items: []CardBody{
+					{
+						Type:  "Container",
+						Style: "Default",
+						Items: []CardBody{
+							{
+								Type:   "TextBlock",
+								Text:   title,
+								Size:   "Medium",
+								Weight: "Bolder",
+							},
+							{
+								Type: "TextBlock",
+								Text: message,
+								Wrap: true,
+							},
+							{
+								Type:  "FactSet",
+								Facts: facts,
+							},
+						},
+					},
+				},
+			},
+		},
+		MSTeams: MSTeamsBody{
+			Width: "Full",
+		},
+	}
+
+	attachment := map[string]interface{}{
+		"contentType": "application/vnd.microsoft.card.adaptive",
+		"content":     cardContent,
+	}
+
+	payload := map[string]interface{}{
+		"type":        "message",
+		"attachments": []interface{}{attachment},
+	}
+
+	bodyAsJSON, _ := json.Marshal(payload)
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/teamsworkflows/teamsworkflows_test.go

@@ -0,0 +1,298 @@
+package teamsworkflows
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
+	if err := invalidProvider.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid, got", err.Error())
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithInvalidOverrideTo := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: ""},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
+		t.Error("provider integration key shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-error",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name         string
+		Provider     AlertProvider
+		Alert        alert.Alert
+		NoConditions bool
+		Resolved     bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"attachments\":[{\"content\":{\"type\":\"AdaptiveCard\",\"version\":\"1.4\",\"body\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"TextBlock\",\"text\":\"\\u0026#x26D1; Gatus\",\"wrap\":false,\"size\":\"Medium\",\"weight\":\"Bolder\"},{\"type\":\"TextBlock\",\"text\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row.\",\"wrap\":true},{\"type\":\"FactSet\",\"wrap\":false,\"facts\":[{\"title\":\"\\u0026#x274C;\",\"value\":\"[CONNECTED] == true\"},{\"title\":\"\\u0026#x274C;\",\"value\":\"[STATUS] == 200\"}]}],\"style\":\"Default\"}],\"style\":\"Attention\"}],\"msteams\":{\"width\":\"Full\"}},\"contentType\":\"application/vnd.microsoft.card.adaptive\"}],\"type\":\"message\"}",
+		},
+		{
+			Name:         "resolved",
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"attachments\":[{\"content\":{\"type\":\"AdaptiveCard\",\"version\":\"1.4\",\"body\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"TextBlock\",\"text\":\"\\u0026#x26D1; Gatus\",\"wrap\":false,\"size\":\"Medium\",\"weight\":\"Bolder\"},{\"type\":\"TextBlock\",\"text\":\"An alert for **endpoint-name** has been resolved after passing successfully 5 time(s) in a row.\",\"wrap\":true},{\"type\":\"FactSet\",\"wrap\":false,\"facts\":[{\"title\":\"\\u0026#x2705;\",\"value\":\"[CONNECTED] == true\"},{\"title\":\"\\u0026#x2705;\",\"value\":\"[STATUS] == 200\"}]}],\"style\":\"Default\"}],\"style\":\"Good\"}],\"msteams\":{\"width\":\"Full\"}},\"contentType\":\"application/vnd.microsoft.card.adaptive\"}],\"type\":\"message\"}",
+		},
+		{
+			Name:         "resolved-with-no-conditions",
+			NoConditions: true,
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"attachments\":[{\"content\":{\"type\":\"AdaptiveCard\",\"version\":\"1.4\",\"body\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"Container\",\"wrap\":false,\"items\":[{\"type\":\"TextBlock\",\"text\":\"\\u0026#x26D1; Gatus\",\"wrap\":false,\"size\":\"Medium\",\"weight\":\"Bolder\"},{\"type\":\"TextBlock\",\"text\":\"An alert for **endpoint-name** has been resolved after passing successfully 5 time(s) in a row.\",\"wrap\":true},{\"type\":\"FactSet\",\"wrap\":false}],\"style\":\"Default\"}],\"style\":\"Good\"}],\"msteams\":{\"width\":\"Full\"}},\"contentType\":\"application/vnd.microsoft.card.adaptive\"}],\"type\":\"message\"}",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+				}
+			}
+			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{ConditionResults: conditionResults},
+				scenario.Resolved,
+			)
+			if string(body) != scenario.ExpectedBody {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+			out := make(map[string]interface{})
+			if err := json.Unmarshal(body, &out); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://example01.com"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/telegram/telegram.go

@@ -3,51 +3,105 @@ package telegram
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-const defaultAPIURL = "https://api.telegram.org"
+const defaultApiUrl = "https://api.telegram.org"
+
+var (
+	ErrTokenNotSet            = errors.New("token not set")
+	ErrIDNotSet               = errors.New("id not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	Token  string `yaml:"token"`
+	ID     string `yaml:"id"`
+	ApiUrl string `yaml:"api-url"`
+
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.ApiUrl) == 0 {
+		cfg.ApiUrl = defaultApiUrl
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	if len(cfg.ID) == 0 {
+		return ErrIDNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.ID) > 0 {
+		cfg.ID = override.ID
+	}
+	if len(override.ApiUrl) > 0 {
+		cfg.ApiUrl = override.ApiUrl
+	}
+}
 
 // AlertProvider is the configuration necessary for sending an alert using Telegram
 type AlertProvider struct {
-	Token  string `yaml:"token"`
+	DefaultConfig Config `yaml:",inline"`
-	ID     string `yaml:"id"`
-	APIURL string `yaml:"api-url"`
-
-	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client,omitempty"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of overrides that may be prioritized over the default configuration
+	Overrides []*Override `yaml:"overrides,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Override is a configuration that may be prioritized over the default configuration
-func (provider *AlertProvider) IsValid() bool {
+type Override struct {
-	if provider.ClientConfig == nil {
+	Group  string `yaml:"group"`
-		provider.ClientConfig = client.GetDefaultConfig()
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
 	}
-	return len(provider.Token) > 0 && len(provider.ID) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	apiURL := provider.APIURL
+	if err != nil {
-	if apiURL == "" {
+		return err
-		apiURL = defaultAPIURL
 	}
-	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/bot%s/sendMessage", apiURL, provider.Token), buffer)
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/bot%s/sendMessage", cfg.ApiUrl, cfg.Token), buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -66,37 +120,72 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	var message, results string
+	var message string
 	if resolved {
-		message = fmt.Sprintf("An alert for *%s* has been resolved:\n—\n    _healthcheck passing successfully %d time(s) in a row_\n—  ", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been resolved:\n—\n    _healthcheck passing successfully %d time(s) in a row_\n—  ", ep.DisplayName(), alert.SuccessThreshold)
 	} else {
-		message = fmt.Sprintf("An alert for *%s* has been triggered:\n—\n    _healthcheck failed %d time(s) in a row_\n—  ", endpoint.DisplayName(), alert.FailureThreshold)
+		message = fmt.Sprintf("An alert for *%s* has been triggered:\n—\n    _healthcheck failed %d time(s) in a row_\n—  ", ep.DisplayName(), alert.FailureThreshold)
 	}
-	for _, conditionResult := range result.ConditionResults {
+	var formattedConditionResults string
-		var prefix string
+	if len(result.ConditionResults) > 0 {
-		if conditionResult.Success {
+		formattedConditionResults = "\n*Condition results*\n"
-			prefix = "✅"
+		for _, conditionResult := range result.ConditionResults {
-		} else {
+			var prefix string
-			prefix = "❌"
+			if conditionResult.Success {
+				prefix = "✅"
+			} else {
+				prefix = "❌"
+			}
+			formattedConditionResults += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
 	}
 	var text string
 	if len(alert.GetDescription()) > 0 {
-		text = fmt.Sprintf("⛑ *Gatus* \n%s \n*Description* \n_%s_  \n\n*Condition results*\n%s", message, alert.GetDescription(), results)
+		text = fmt.Sprintf("⛑ *Gatus* \n%s \n*Description* \n_%s_  \n%s", message, alert.GetDescription(), formattedConditionResults)
 	} else {
-		text = fmt.Sprintf("⛑ *Gatus* \n%s \n*Condition results*\n%s", message, results)
+		text = fmt.Sprintf("⛑ *Gatus* \n%s%s", message, formattedConditionResults)
 	}
-	body, _ := json.Marshal(Body{
+	bodyAsJSON, _ := json.Marshal(Body{
-		ChatID:    provider.ID,
+		ChatID:    cfg.ID,
 		Text:      text,
 		ParseMode: "MARKDOWN",
 	})
-	return body
+	return bodyAsJSON
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/telegram/telegram_test.go

@@ -7,27 +7,39 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	t.Run("invalid-provider", func(t *testing.T) {
-		invalidProvider := AlertProvider{Token: "", ID: ""}
+		invalidProvider := AlertProvider{DefaultConfig: Config{Token: "", ID: ""}}
-		if invalidProvider.IsValid() {
+		if err := invalidProvider.Validate(); err == nil {
 			t.Error("provider shouldn't have been valid")
 		}
 	})
 	t.Run("valid-provider", func(t *testing.T) {
-		validProvider := AlertProvider{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}
+		validProvider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}}
-		if validProvider.ClientConfig != nil {
+		if err := validProvider.Validate(); err != nil {
-			t.Error("provider client config should have been nil prior to IsValid() being executed")
-		}
-		if !validProvider.IsValid() {
 			t.Error("provider should've been valid")
 		}
-		if validProvider.ClientConfig == nil {
+	})
-			t.Error("provider client config should have been set after IsValid() was executed")
+	t.Run("invalid-provider-override-nonexist-group", func(t *testing.T) {
+		invalidProvider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Config: Config{Token: "token", ID: "id"}}}}
+		if err := invalidProvider.Validate(); err == nil {
+			t.Error("provider shouldn't have been valid")
+		}
+	})
+	t.Run("invalid-provider-override-duplicate-group", func(t *testing.T) {
+		invalidProvider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group1", Config: Config{Token: "token", ID: "id"}}, {Group: "group1", Config: Config{ID: "id2"}}}}
+		if err := invalidProvider.Validate(); err == nil {
+			t.Error("provider shouldn't have been valid")
+		}
+	})
+	t.Run("valid-provider-with-overrides", func(t *testing.T) {
+		validProvider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group", Config: Config{Token: "token", ID: "id"}}}}
+		if err := validProvider.Validate(); err != nil {
+			t.Error("provider should've been valid")
 		}
 	})
 }
@@ -46,7 +58,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ID: "123", Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -56,7 +68,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ID: "123", Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -66,7 +78,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ID: "123", Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -76,7 +88,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{ID: "123", Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -89,10 +101,10 @@ func TestAlertProvider_Send(t *testing.T) {
 		t.Run(scenario.Name, func(t *testing.T) {
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
 			err := scenario.Provider.Send(
-				&core.Endpoint{Name: "endpoint-name"},
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -116,35 +128,47 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		Name         string
 		Provider     AlertProvider
 		Alert        alert.Alert
+		NoConditions bool
 		Resolved     bool
 		ExpectedBody string
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{ID: "123"},
+			Provider:     AlertProvider{DefaultConfig: Config{ID: "123"}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"chat_id\":\"123\",\"text\":\"⛑ *Gatus* \\nAn alert for *endpoint-name* has been triggered:\\n—\\n    _healthcheck failed 3 time(s) in a row_\\n—   \\n*Description* \\n_description-1_  \\n\\n*Condition results*\\n❌ - `[CONNECTED] == true`\\n❌ - `[STATUS] == 200`\\n\",\"parse_mode\":\"MARKDOWN\"}",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{ID: "123"},
+			Provider:     AlertProvider{DefaultConfig: Config{ID: "123"}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
-			ExpectedBody: "{\"chat_id\":\"123\",\"text\":\"⛑ *Gatus* \\nAn alert for *endpoint-name* has been resolved:\\n—\\n    _healthcheck passing successfully 3 time(s) in a row_\\n—   \\n*Description* \\n_description-2_  \\n\\n*Condition results*\\n✅ - `[CONNECTED] == true`\\n✅ - `[STATUS] == 200`\\n\",\"parse_mode\":\"MARKDOWN\"}",
+			ExpectedBody: "{\"chat_id\":\"123\",\"text\":\"⛑ *Gatus* \\nAn alert for *endpoint-name* has been resolved:\\n—\\n    _healthcheck passing successfully 5 time(s) in a row_\\n—   \\n*Description* \\n_description-2_  \\n\\n*Condition results*\\n✅ - `[CONNECTED] == true`\\n✅ - `[STATUS] == 200`\\n\",\"parse_mode\":\"MARKDOWN\"}",
+		},
+		{
+			Name:         "resolved-with-no-conditions",
+			NoConditions: true,
+			Provider:     AlertProvider{DefaultConfig: Config{ID: "123"}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"chat_id\":\"123\",\"text\":\"⛑ *Gatus* \\nAn alert for *endpoint-name* has been resolved:\\n—\\n    _healthcheck passing successfully 5 time(s) in a row_\\n—   \\n*Description* \\n_description-2_  \\n\",\"parse_mode\":\"MARKDOWN\"}",
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+				}
+			}
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{ConditionResults: conditionResults},
-					ConditionResults: []*core.ConditionResult{
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-					},
-				},
 				scenario.Resolved,
 			)
 			if string(body) != scenario.ExpectedBody {
@@ -159,10 +183,70 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	t.Run("get-token-with-override", func(t *testing.T) {
+		provider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group", Config: Config{Token: "groupToken", ID: "overrideID"}}}}
+		cfg, err := provider.GetConfig("group", &alert.Alert{})
+		if err != nil {
+			t.Error("expected no error, got", err)
+		}
+		if cfg.Token != "groupToken" {
+			t.Error("token should have been 'groupToken'")
+		}
+		if cfg.ID != "overrideID" {
+			t.Error("id should have been 'overrideID'")
+		}
+	})
+	t.Run("get-default-token-with-overridden-id", func(t *testing.T) {
+		provider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group", Config: Config{ID: "overrideID"}}}}
+		cfg, err := provider.GetConfig("group", &alert.Alert{})
+		if err != nil {
+			t.Error("expected no error, got", err)
+		}
+		if cfg.Token != provider.DefaultConfig.Token {
+			t.Error("token should have been the default token")
+		}
+		if cfg.ID != "overrideID" {
+			t.Error("id should have been 'overrideID'")
+		}
+	})
+	t.Run("get-default-token-with-overridden-token", func(t *testing.T) {
+		provider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group", Config: Config{Token: "groupToken"}}}}
+		cfg, err := provider.GetConfig("group", &alert.Alert{})
+		if err != nil {
+			t.Error("expected no error, got", err)
+		}
+		if cfg.Token != "groupToken" {
+			t.Error("token should have been 'groupToken'")
+		}
+		if cfg.ID != provider.DefaultConfig.ID {
+			t.Error("id should have been the default id")
+		}
+	})
+	t.Run("get-default-token-with-overridden-token-and-alert-token-override", func(t *testing.T) {
+		provider := AlertProvider{DefaultConfig: Config{Token: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11", ID: "12345678"}, Overrides: []*Override{{Group: "group", Config: Config{Token: "groupToken"}}}}
+		alert := &alert.Alert{ProviderOverride: map[string]any{"token": "alertToken"}}
+		cfg, err := provider.GetConfig("group", alert)
+		if err != nil {
+			t.Error("expected no error, got", err)
+		}
+		if cfg.Token != "alertToken" {
+			t.Error("token should have been 'alertToken'")
+		}
+		if cfg.ID != provider.DefaultConfig.ID {
+			t.Error("id should have been the default id")
+		}
+		// Test ValidateOverrides as well, since it really just calls GetConfig
+		if err = provider.ValidateOverrides("group", alert); err != nil {
+			t.Errorf("unexpected error: %s", err)
+		}
+	})
+}

alerting/provider/twilio/twilio.go

@@ -3,6 +3,7 @@ package twilio
 import (
 	"bytes"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,34 +11,81 @@ import (
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Twilio
+var (
-type AlertProvider struct {
+	ErrSIDNotSet   = errors.New("sid not set")
+	ErrTokenNotSet = errors.New("token not set")
+	ErrFromNotSet  = errors.New("from not set")
+	ErrToNotSet    = errors.New("to not set")
+)
+
+type Config struct {
 	SID   string `yaml:"sid"`
 	Token string `yaml:"token"`
 	From  string `yaml:"from"`
 	To    string `yaml:"to"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.SID) == 0 {
+		return ErrSIDNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	if len(cfg.From) == 0 {
+		return ErrFromNotSet
+	}
+	if len(cfg.To) == 0 {
+		return ErrToNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.SID) > 0 {
+		cfg.SID = override.SID
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.From) > 0 {
+		cfg.From = override.From
+	}
+	if len(override.To) > 0 {
+		cfg.To = override.To
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Twilio
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
+// Validate the provider's configuration
-func (provider *AlertProvider) IsValid() bool {
+func (provider *AlertProvider) Validate() error {
-	return len(provider.Token) > 0 && len(provider.SID) > 0 && len(provider.From) > 0 && len(provider.To) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
-func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(endpoint, alert, result, resolved)))
+	cfg, err := provider.GetConfig(ep.Group, alert)
-	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("https://api.twilio.com/2010-04-01/Accounts/%s/Messages.json", provider.SID), buffer)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(cfg, ep, alert, result, resolved)))
+	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("https://api.twilio.com/2010-04-01/Accounts/%s/Messages.json", cfg.SID), buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-	request.Header.Set("Authorization", fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(provider.SID+":"+provider.Token))))
+	request.Header.Set("Authorization", fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(cfg.SID+":"+cfg.Token))))
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -51,21 +99,43 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) string {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) string {
 	var message string
 	if resolved {
-		message = fmt.Sprintf("RESOLVED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("RESOLVED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	} else {
-		message = fmt.Sprintf("TRIGGERED: %s - %s", endpoint.DisplayName(), alert.GetDescription())
+		message = fmt.Sprintf("TRIGGERED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	}
 	return url.Values{
-		"To":   {provider.To},
+		"To":   {cfg.To},
-		"From": {provider.From},
+		"From": {cfg.From},
 		"Body": {message},
 	}.Encode()
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
-func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/twilio/twilio_test.go

@@ -1,28 +1,110 @@
 package twilio
 
 import (
+	"net/http"
 	"testing"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
 )
 
 func TestTwilioAlertProvider_IsValid(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
 	validProvider := AlertProvider{
-		SID:   "1",
+		DefaultConfig: Config{
-		Token: "1",
+			SID:   "1",
-		From:  "1",
+			Token: "1",
-		To:    "1",
+			From:  "1",
+			To:    "1",
+		},
 	}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-error",
+			Provider: AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
 func TestAlertProvider_buildRequestBody(t *testing.T) {
 	firstDescription := "description-1"
 	secondDescription := "description-2"
@@ -35,14 +117,14 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{SID: "1", Token: "2", From: "3", To: "4"},
+			Provider:     AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "Body=TRIGGERED%3A+endpoint-name+-+description-1&From=3&To=4",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{SID: "1", Token: "2", From: "3", To: "4"},
+			Provider:     AlertProvider{DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "Body=RESOLVED%3A+endpoint-name+-+description-2&From=3&To=4",
@@ -51,10 +133,11 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
-				&core.Endpoint{Name: "endpoint-name"},
+				&scenario.Provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
-				&core.Result{
+				&endpoint.Result{
-					ConditionResults: []*core.ConditionResult{
+					ConditionResults: []*endpoint.ConditionResult{
 						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
 						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
 					},
@@ -69,10 +152,60 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 }
 
 func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
 		t.Error("expected default alert to be not nil")
 	}
-	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{SID: "1", Token: "2", From: "3", To: "4"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{SID: "1", Token: "2", From: "3", To: "4"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"sid": "5", "token": "6", "from": "7", "to": "8"}},
+			ExpectedOutput: Config{SID: "5", Token: "6", From: "7", To: "8"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Error("expected no error, got:", err.Error())
+			}
+			if got.SID != scenario.ExpectedOutput.SID {
+				t.Errorf("expected SID to be %s, got %s", scenario.ExpectedOutput.SID, got.SID)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token to be %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if got.From != scenario.ExpectedOutput.From {
+				t.Errorf("expected from to be %s, got %s", scenario.ExpectedOutput.From, got.From)
+			}
+			if got.To != scenario.ExpectedOutput.To {
+				t.Errorf("expected to to be %s, got %s", scenario.ExpectedOutput.To, got.To)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/zulip/zulip.go

@@ -0,0 +1,183 @@
+package zulip
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrBotEmailNotSet         = errors.New("bot-email not set")
+	ErrBotAPIKeyNotSet        = errors.New("bot-api-key not set")
+	ErrDomainNotSet           = errors.New("domain not set")
+	ErrChannelIDNotSet        = errors.New("channel-id not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	BotEmail  string `yaml:"bot-email"`   // Email of the bot user
+	BotAPIKey string `yaml:"bot-api-key"` // API key of the bot user
+	Domain    string `yaml:"domain"`      // Domain of the Zulip server
+	ChannelID string `yaml:"channel-id"`  // ID of the channel to send the message to
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.BotEmail) == 0 {
+		return ErrBotEmailNotSet
+	}
+	if len(cfg.BotAPIKey) == 0 {
+		return ErrBotAPIKeyNotSet
+	}
+	if len(cfg.Domain) == 0 {
+		return ErrDomainNotSet
+	}
+	if len(cfg.ChannelID) == 0 {
+		return ErrChannelIDNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.BotEmail) > 0 {
+		cfg.BotEmail = override.BotEmail
+	}
+	if len(override.BotAPIKey) > 0 {
+		cfg.BotAPIKey = override.BotAPIKey
+	}
+	if len(override.Domain) > 0 {
+		cfg.Domain = override.Domain
+	}
+	if len(override.ChannelID) > 0 {
+		cfg.ChannelID = override.ChannelID
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Zulip
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBufferString(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	zulipEndpoint := fmt.Sprintf("https://%s/api/v1/messages", cfg.Domain)
+	request, err := http.NewRequest(http.MethodPost, zulipEndpoint, buffer)
+	if err != nil {
+		return err
+	}
+	request.SetBasicAuth(cfg.BotEmail, cfg.BotAPIKey)
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	request.Header.Set("User-Agent", "Gatus")
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return nil
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) string {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("An alert for **%s** has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		message = fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		message += "\n> " + alertDescription + "\n"
+	}
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = ":check:"
+		} else {
+			prefix = ":cross_mark:"
+		}
+		message += fmt.Sprintf("\n%s - `%s`", prefix, conditionResult.Condition)
+	}
+	return url.Values{
+		"type":    {"channel"},
+		"to":      {cfg.ChannelID},
+		"topic":   {"Gatus"},
+		"content": {message},
+	}.Encode()
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/zulip/zulip_test.go

@@ -0,0 +1,482 @@
+package zulip
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		Name          string
+		AlertProvider AlertProvider
+		ExpectedError error
+	}{
+		{
+			Name:          "Empty provider",
+			AlertProvider: AlertProvider{},
+			ExpectedError: ErrBotEmailNotSet,
+		},
+		{
+			Name: "Empty channel id",
+			AlertProvider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "something",
+					BotAPIKey: "something",
+					Domain:    "something",
+				},
+			},
+			ExpectedError: ErrChannelIDNotSet,
+		},
+		{
+			Name: "Empty domain",
+			AlertProvider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "something",
+					BotAPIKey: "something",
+					ChannelID: "something",
+				},
+			},
+			ExpectedError: ErrDomainNotSet,
+		},
+		{
+			Name: "Empty bot api key",
+			AlertProvider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "something",
+					Domain:    "something",
+					ChannelID: "something",
+				},
+			},
+			ExpectedError: ErrBotAPIKeyNotSet,
+		},
+		{
+			Name: "Empty bot email",
+			AlertProvider: AlertProvider{
+				DefaultConfig: Config{
+					BotAPIKey: "something",
+					Domain:    "something",
+					ChannelID: "something",
+				},
+			},
+			ExpectedError: ErrBotEmailNotSet,
+		},
+		{
+			Name: "Valid provider",
+			AlertProvider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "something",
+					BotAPIKey: "something",
+					Domain:    "something",
+					ChannelID: "something",
+				},
+			},
+			ExpectedError: nil,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			if err := scenario.AlertProvider.Validate(); !errors.Is(err, scenario.ExpectedError) {
+				t.Errorf("ExpectedError error %v, got %v", scenario.ExpectedError, err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	basicConfig := Config{
+		BotEmail:  "bot-email",
+		BotAPIKey: "bot-api-key",
+		Domain:    "domain",
+		ChannelID: "channel-id",
+	}
+	alertDesc := "Description"
+	basicAlert := alert.Alert{
+		SuccessThreshold: 2,
+		FailureThreshold: 3,
+		Description:      &alertDesc,
+	}
+	testCases := []struct {
+		name          string
+		provider      AlertProvider
+		alert         alert.Alert
+		resolved      bool
+		hasConditions bool
+		expectedBody  url.Values
+	}{
+		{
+			name: "Resolved alert with no conditions",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:         basicAlert,
+			resolved:      true,
+			hasConditions: false,
+			expectedBody: url.Values{
+				"content": {`An alert for **endpoint-Name** has been resolved after passing successfully 2 time(s) in a row
+> Description
+`},
+				"to":    {"channel-id"},
+				"topic": {"Gatus"},
+				"type":  {"channel"},
+			},
+		},
+		{
+			name: "Resolved alert with conditions",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:         basicAlert,
+			resolved:      true,
+			hasConditions: true,
+			expectedBody: url.Values{
+				"content": {`An alert for **endpoint-Name** has been resolved after passing successfully 2 time(s) in a row
+> Description
+
+:check: - ` + "`[CONNECTED] == true`" + `
+:check: - ` + "`[STATUS] == 200`" + `
+:check: - ` + "`[BODY] != \"\"`"},
+				"to":    {"channel-id"},
+				"topic": {"Gatus"},
+				"type":  {"channel"},
+			},
+		},
+		{
+			name: "Failed alert with no conditions",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:         basicAlert,
+			resolved:      false,
+			hasConditions: false,
+			expectedBody: url.Values{
+				"content": {`An alert for **endpoint-Name** has been triggered due to having failed 3 time(s) in a row
+> Description
+`},
+				"to":    {"channel-id"},
+				"topic": {"Gatus"},
+				"type":  {"channel"},
+			},
+		},
+		{
+			name: "Failed alert with conditions",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:         basicAlert,
+			resolved:      false,
+			hasConditions: true,
+			expectedBody: url.Values{
+				"content": {`An alert for **endpoint-Name** has been triggered due to having failed 3 time(s) in a row
+> Description
+
+:cross_mark: - ` + "`[CONNECTED] == true`" + `
+:cross_mark: - ` + "`[STATUS] == 200`" + `
+:cross_mark: - ` + "`[BODY] != \"\"`"},
+				"to":    {"channel-id"},
+				"topic": {"Gatus"},
+				"type":  {"channel"},
+			},
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if tc.hasConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: tc.resolved},
+					{Condition: "[STATUS] == 200", Success: tc.resolved},
+					{Condition: "[BODY] != \"\"", Success: tc.resolved},
+				}
+			}
+			body := tc.provider.buildRequestBody(
+				&tc.provider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-Name"},
+				&tc.alert,
+				&endpoint.Result{
+					ConditionResults: conditionResults,
+				},
+				tc.resolved,
+			)
+			valuesResult, err := url.ParseQuery(body)
+			if err != nil {
+				t.Error(err)
+			}
+			if fmt.Sprintf("%v", valuesResult) != fmt.Sprintf("%v", tc.expectedBody) {
+				t.Errorf("Expected body:\n%v\ngot:\n%v", tc.expectedBody, valuesResult)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("ExpectedError default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("ExpectedError default alert to be nil")
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	validateRequest := func(req *http.Request) {
+		if req.URL.String() != "https://custom-domain/api/v1/messages" {
+			t.Errorf("ExpectedError url https://custom-domain.zulipchat.com/api/v1/messages, got %s", req.URL.String())
+		}
+		if req.Method != http.MethodPost {
+			t.Errorf("ExpectedError POST request, got %s", req.Method)
+		}
+		if req.Header.Get("Content-Type") != "application/x-www-form-urlencoded" {
+			t.Errorf("ExpectedError Content-Type header to be application/x-www-form-urlencoded, got %s", req.Header.Get("Content-Type"))
+		}
+		if req.Header.Get("User-Agent") != "Gatus" {
+			t.Errorf("ExpectedError User-Agent header to be Gatus, got %s", req.Header.Get("User-Agent"))
+		}
+	}
+	basicConfig := Config{
+		BotEmail:  "bot-email",
+		BotAPIKey: "bot-api-key",
+		Domain:    "custom-domain",
+		ChannelID: "channel-id",
+	}
+	basicAlert := alert.Alert{
+		SuccessThreshold: 2,
+		FailureThreshold: 3,
+	}
+	testCases := []struct {
+		name             string
+		provider         AlertProvider
+		alert            alert.Alert
+		resolved         bool
+		mockRoundTripper test.MockRoundTripper
+		expectedError    bool
+	}{
+		{
+			name: "resolved",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:    basicAlert,
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(req *http.Request) *http.Response {
+				validateRequest(req)
+				return &http.Response{StatusCode: http.StatusOK}
+			}),
+			expectedError: false,
+		},
+		{
+			name: "resolved error",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:    basicAlert,
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(req *http.Request) *http.Response {
+				validateRequest(req)
+				return &http.Response{StatusCode: http.StatusInternalServerError}
+			}),
+			expectedError: true,
+		},
+		{
+			name: "triggered",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:    basicAlert,
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(req *http.Request) *http.Response {
+				validateRequest(req)
+				return &http.Response{StatusCode: http.StatusOK}
+			}),
+			expectedError: false,
+		},
+		{
+			name: "triggered error",
+			provider: AlertProvider{
+				DefaultConfig: basicConfig,
+			},
+			alert:    basicAlert,
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(req *http.Request) *http.Response {
+				validateRequest(req)
+				return &http.Response{StatusCode: http.StatusInternalServerError}
+			}),
+			expectedError: true,
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: tc.mockRoundTripper})
+			err := tc.provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-Name"},
+				&tc.alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: tc.resolved},
+						{Condition: "[STATUS] == 200", Success: tc.resolved},
+					},
+				},
+				tc.resolved,
+			)
+			if tc.expectedError && err == nil {
+				t.Error("ExpectedError error, got none")
+			}
+			if !tc.expectedError && err != nil {
+				t.Errorf("ExpectedError no error, got: %v", err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-overrides",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "default-bot-email",
+					BotAPIKey: "default-bot-api-key",
+					Domain:    "default-domain",
+					ChannelID: "default-channel-id",
+				},
+				Overrides: nil,
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
+				BotEmail:  "default-bot-email",
+				BotAPIKey: "default-bot-api-key",
+				Domain:    "default-domain",
+				ChannelID: "default-channel-id",
+			},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "default-bot-email",
+					BotAPIKey: "default-bot-api-key",
+					Domain:    "default-domain",
+					ChannelID: "default-channel-id",
+				},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{ChannelID: "group-channel-id"},
+					},
+				},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
+				BotEmail:  "default-bot-email",
+				BotAPIKey: "default-bot-api-key",
+				Domain:    "default-domain",
+				ChannelID: "default-channel-id",
+			},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "default-bot-email",
+					BotAPIKey: "default-bot-api-key",
+					Domain:    "default-domain",
+					ChannelID: "default-channel-id",
+				},
+				Overrides: []Override{
+					{
+						Group: "group",
+						Config: Config{
+							BotEmail:  "group-bot-email",
+							BotAPIKey: "group-bot-api-key",
+							Domain:    "group-domain",
+							ChannelID: "group-channel-id",
+						},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
+				BotEmail:  "group-bot-email",
+				BotAPIKey: "group-bot-api-key",
+				Domain:    "group-domain",
+				ChannelID: "group-channel-id",
+			},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					BotEmail:  "default-bot-email",
+					BotAPIKey: "default-bot-api-key",
+					Domain:    "default-domain",
+					ChannelID: "default-channel-id",
+				},
+				Overrides: []Override{
+					{
+						Group: "group",
+						Config: Config{
+							BotEmail:  "group-bot-email",
+							BotAPIKey: "group-bot-api-key",
+							Domain:    "group-domain",
+							ChannelID: "group-channel-id",
+						},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"bot-email":   "alert-bot-email",
+				"bot-api-key": "alert-bot-api-key",
+				"domain":      "alert-domain",
+				"channel-id":  "alert-channel-id",
+			}},
+			ExpectedOutput: Config{
+				BotEmail:  "alert-bot-email",
+				BotAPIKey: "alert-bot-api-key",
+				Domain:    "alert-domain",
+				ChannelID: "alert-channel-id",
+			},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.BotEmail != scenario.ExpectedOutput.BotEmail {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.BotEmail, got.BotEmail)
+			}
+			if got.BotAPIKey != scenario.ExpectedOutput.BotAPIKey {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.BotAPIKey, got.BotAPIKey)
+			}
+			if got.Domain != scenario.ExpectedOutput.Domain {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.Domain, got.Domain)
+			}
+			if got.ChannelID != scenario.ExpectedOutput.ChannelID {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.ChannelID, got.ChannelID)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

api/api.go

@@ -0,0 +1,122 @@
+package api
+
+import (
+	"io/fs"
+	"net/http"
+	"os"
+
+	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/web"
+	static "github.com/TwiN/gatus/v5/web"
+	"github.com/TwiN/health"
+	"github.com/TwiN/logr"
+	fiber "github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/adaptor"
+	"github.com/gofiber/fiber/v2/middleware/compress"
+	"github.com/gofiber/fiber/v2/middleware/cors"
+	fiberfs "github.com/gofiber/fiber/v2/middleware/filesystem"
+	"github.com/gofiber/fiber/v2/middleware/recover"
+	"github.com/gofiber/fiber/v2/middleware/redirect"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+type API struct {
+	router *fiber.App
+}
+
+func New(cfg *config.Config) *API {
+	api := &API{}
+	if cfg.Web == nil {
+		logr.Warnf("[api.New] nil web config passed as parameter. This should only happen in tests. Using default web configuration")
+		cfg.Web = web.GetDefaultConfig()
+	}
+	api.router = api.createRouter(cfg)
+	return api
+}
+
+func (a *API) Router() *fiber.App {
+	return a.router
+}
+
+func (a *API) createRouter(cfg *config.Config) *fiber.App {
+	app := fiber.New(fiber.Config{
+		ErrorHandler: func(c *fiber.Ctx, err error) error {
+			logr.Errorf("[api.ErrorHandler] %s", err.Error())
+			return fiber.DefaultErrorHandler(c, err)
+		},
+		ReadBufferSize: cfg.Web.ReadBufferSize,
+		Network:        fiber.NetworkTCP,
+	})
+	if os.Getenv("ENVIRONMENT") == "dev" {
+		app.Use(cors.New(cors.Config{
+			AllowOrigins:     "http://localhost:8081",
+			AllowCredentials: true,
+		}))
+	}
+	// Middlewares
+	app.Use(recover.New())
+	app.Use(compress.New())
+	// Define metrics handler, if necessary
+	if cfg.Metrics {
+		metricsHandler := promhttp.InstrumentMetricHandler(prometheus.DefaultRegisterer, promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{
+			DisableCompression: true,
+		}))
+		app.Get("/metrics", adaptor.HTTPHandler(metricsHandler))
+	}
+	// Define main router
+	apiRouter := app.Group("/api")
+	////////////////////////
+	// UNPROTECTED ROUTES //
+	////////////////////////
+	unprotectedAPIRouter := apiRouter.Group("/")
+	unprotectedAPIRouter.Get("/v1/config", ConfigHandler{securityConfig: cfg.Security}.GetConfig)
+	unprotectedAPIRouter.Get("/v1/endpoints/:key/health/badge.svg", HealthBadge)
+	unprotectedAPIRouter.Get("/v1/endpoints/:key/health/badge.shields", HealthBadgeShields)
+	unprotectedAPIRouter.Get("/v1/endpoints/:key/uptimes/:duration/badge.svg", UptimeBadge)
+	unprotectedAPIRouter.Get("/v1/endpoints/:key/response-times/:duration/badge.svg", ResponseTimeBadge(cfg))
+	unprotectedAPIRouter.Get("/v1/endpoints/:key/response-times/:duration/chart.svg", ResponseTimeChart)
+	// This endpoint requires authz with bearer token, so technically it is protected
+	unprotectedAPIRouter.Post("/v1/endpoints/:key/external", CreateExternalEndpointResult(cfg))
+	// SPA
+	app.Get("/", SinglePageApplication(cfg.UI))
+	app.Get("/endpoints/:name", SinglePageApplication(cfg.UI))
+	// Health endpoint
+	healthHandler := health.Handler().WithJSON(true)
+	app.Get("/health", func(c *fiber.Ctx) error {
+		statusCode, body := healthHandler.GetResponseStatusCodeAndBody()
+		return c.Status(statusCode).Send(body)
+	})
+	// Everything else falls back on static content
+	app.Use(redirect.New(redirect.Config{
+		Rules: map[string]string{
+			"/index.html": "/",
+		},
+		StatusCode: 301,
+	}))
+	staticFileSystem, err := fs.Sub(static.FileSystem, static.RootPath)
+	if err != nil {
+		panic(err)
+	}
+	app.Use("/", fiberfs.New(fiberfs.Config{
+		Root:   http.FS(staticFileSystem),
+		Index:  "index.html",
+		Browse: true,
+	}))
+	//////////////////////
+	// PROTECTED ROUTES //
+	//////////////////////
+	// ORDER IS IMPORTANT: all routes applied AFTER the security middleware will require authn
+	protectedAPIRouter := apiRouter.Group("/")
+	if cfg.Security != nil {
+		if err := cfg.Security.RegisterHandlers(app); err != nil {
+			panic(err)
+		}
+		if err := cfg.Security.ApplySecurityMiddleware(protectedAPIRouter); err != nil {
+			panic(err)
+		}
+	}
+	protectedAPIRouter.Get("/v1/endpoints/statuses", EndpointStatuses(cfg))
+	protectedAPIRouter.Get("/v1/endpoints/:key/statuses", EndpointStatus)
+	return app
+}

api/api_test.go

@@ -0,0 +1,121 @@
+package api
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/ui"
+	"github.com/TwiN/gatus/v5/security"
+	"github.com/gofiber/fiber/v2"
+)
+
+func TestNew(t *testing.T) {
+	type Scenario struct {
+		Name         string
+		Path         string
+		ExpectedCode int
+		Gzip         bool
+		WithSecurity bool
+	}
+	scenarios := []Scenario{
+		{
+			Name:         "health",
+			Path:         "/health",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "metrics",
+			Path:         "/metrics",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "favicon.ico",
+			Path:         "/favicon.ico",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "app.js",
+			Path:         "/js/app.js",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "app.js-gzipped",
+			Path:         "/js/app.js",
+			ExpectedCode: fiber.StatusOK,
+			Gzip:         true,
+		},
+		{
+			Name:         "chunk-vendors.js",
+			Path:         "/js/chunk-vendors.js",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "chunk-vendors.js-gzipped",
+			Path:         "/js/chunk-vendors.js",
+			ExpectedCode: fiber.StatusOK,
+			Gzip:         true,
+		},
+		{
+			Name:         "index",
+			Path:         "/",
+			ExpectedCode: fiber.StatusOK,
+		},
+		{
+			Name:         "index-html-redirect",
+			Path:         "/index.html",
+			ExpectedCode: fiber.StatusMovedPermanently,
+		},
+		{
+			Name:         "index-should-return-200-even-if-not-authenticated",
+			Path:         "/",
+			ExpectedCode: fiber.StatusOK,
+			WithSecurity: true,
+		},
+		{
+			Name:         "endpoints-should-return-401-if-not-authenticated",
+			Path:         "/api/v1/endpoints/statuses",
+			ExpectedCode: fiber.StatusUnauthorized,
+			WithSecurity: true,
+		},
+		{
+			Name:         "config-should-return-200-even-if-not-authenticated",
+			Path:         "/api/v1/config",
+			ExpectedCode: fiber.StatusOK,
+			WithSecurity: true,
+		},
+		{
+			Name:         "config-should-always-return-200",
+			Path:         "/api/v1/config",
+			ExpectedCode: fiber.StatusOK,
+			WithSecurity: false,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg := &config.Config{Metrics: true, UI: &ui.Config{}}
+			if scenario.WithSecurity {
+				cfg.Security = &security.Config{
+					Basic: &security.BasicConfig{
+						Username:                        "john.doe",
+						PasswordBcryptHashBase64Encoded: "JDJhJDA4JDFoRnpPY1hnaFl1OC9ISlFsa21VS09wOGlPU1ZOTDlHZG1qeTFvb3dIckRBUnlHUmNIRWlT",
+					},
+				}
+			}
+			api := New(cfg)
+			router := api.Router()
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
+			if scenario.Gzip {
+				request.Header.Set("Accept-Encoding", "gzip")
+			}
+			response, err := router.Test(request)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
+			}
+		})
+	}
+}

api/badge.go

@@ -1,17 +1,19 @@
-package handler
+package api
 
 import (
+	"encoding/json"
+	"errors"
 	"fmt"
-	"net/http"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/endpoint/ui"
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/storage/store/common"
 	"github.com/TwiN/gatus/v5/storage/store/common/paging"
-	"github.com/gorilla/mux"
+	"github.com/gofiber/fiber/v2"
 )
 
 const (
@@ -35,12 +37,13 @@ var (
 
 // UptimeBadge handles the automatic generation of badge based on the group name and endpoint name passed.
 //
-// Valid values for {duration}: 7d, 24h, 1h
+// Valid values for :duration -> 30d, 7d, 24h, 1h
-func UptimeBadge(writer http.ResponseWriter, request *http.Request) {
+func UptimeBadge(c *fiber.Ctx) error {
-	variables := mux.Vars(request)
+	duration := c.Params("duration")
-	duration := variables["duration"]
 	var from time.Time
 	switch duration {
+	case "30d":
+		from = time.Now().Add(-30 * 24 * time.Hour)
 	case "7d":
 		from = time.Now().Add(-7 * 24 * time.Hour)
 	case "24h":
@@ -48,37 +51,34 @@ func UptimeBadge(writer http.ResponseWriter, request *http.Request) {
 	case "1h":
 		from = time.Now().Add(-2 * time.Hour) // Because uptime metrics are stored by hour, we have to cheat a little
 	default:
-		http.Error(writer, "Durations supported: 7d, 24h, 1h", http.StatusBadRequest)
+		return c.Status(400).SendString("Durations supported: 30d, 7d, 24h, 1h")
-		return
 	}
-	key := variables["key"]
+	key := c.Params("key")
 	uptime, err := store.Get().GetUptimeByKey(key, from, time.Now())
 	if err != nil {
-		if err == common.ErrEndpointNotFound {
+		if errors.Is(err, common.ErrEndpointNotFound) {
-			http.Error(writer, err.Error(), http.StatusNotFound)
+			return c.Status(404).SendString(err.Error())
-		} else if err == common.ErrInvalidTimeRange {
+		} else if errors.Is(err, common.ErrInvalidTimeRange) {
-			http.Error(writer, err.Error(), http.StatusBadRequest)
+			return c.Status(400).SendString(err.Error())
-		} else {
-			http.Error(writer, err.Error(), http.StatusInternalServerError)
 		}
-		return
+		return c.Status(500).SendString(err.Error())
 	}
-	writer.Header().Set("Content-Type", "image/svg+xml")
+	c.Set("Content-Type", "image/svg+xml")
-	writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	c.Set("Cache-Control", "no-cache, no-store, must-revalidate")
-	writer.Header().Set("Expires", "0")
+	c.Set("Expires", "0")
-	writer.WriteHeader(http.StatusOK)
+	return c.Status(200).Send(generateUptimeBadgeSVG(duration, uptime))
-	_, _ = writer.Write(generateUptimeBadgeSVG(duration, uptime))
 }
 
 // ResponseTimeBadge handles the automatic generation of badge based on the group name and endpoint name passed.
 //
-// Valid values for {duration}: 7d, 24h, 1h
+// Valid values for :duration -> 30d, 7d, 24h, 1h
-func ResponseTimeBadge(config *config.Config) http.HandlerFunc {
+func ResponseTimeBadge(cfg *config.Config) fiber.Handler {
-	return func(writer http.ResponseWriter, request *http.Request) {
+	return func(c *fiber.Ctx) error {
-		variables := mux.Vars(request)
+		duration := c.Params("duration")
-		duration := variables["duration"]
 		var from time.Time
 		switch duration {
+		case "30d":
+			from = time.Now().Add(-30 * 24 * time.Hour)
 		case "7d":
 			from = time.Now().Add(-7 * 24 * time.Hour)
 		case "24h":
@@ -86,44 +86,37 @@ func ResponseTimeBadge(config *config.Config) http.HandlerFunc {
 		case "1h":
 			from = time.Now().Add(-2 * time.Hour) // Because response time metrics are stored by hour, we have to cheat a little
 		default:
-			http.Error(writer, "Durations supported: 7d, 24h, 1h", http.StatusBadRequest)
+			return c.Status(400).SendString("Durations supported: 30d, 7d, 24h, 1h")
-			return
 		}
-		key := variables["key"]
+		key := c.Params("key")
 		averageResponseTime, err := store.Get().GetAverageResponseTimeByKey(key, from, time.Now())
 		if err != nil {
-			if err == common.ErrEndpointNotFound {
+			if errors.Is(err, common.ErrEndpointNotFound) {
-				http.Error(writer, err.Error(), http.StatusNotFound)
+				return c.Status(404).SendString(err.Error())
-			} else if err == common.ErrInvalidTimeRange {
+			} else if errors.Is(err, common.ErrInvalidTimeRange) {
-				http.Error(writer, err.Error(), http.StatusBadRequest)
+				return c.Status(400).SendString(err.Error())
-			} else {
-				http.Error(writer, err.Error(), http.StatusInternalServerError)
 			}
-			return
+			return c.Status(500).SendString(err.Error())
 		}
-		writer.Header().Set("Content-Type", "image/svg+xml")
+		c.Set("Content-Type", "image/svg+xml")
-		writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+		c.Set("Cache-Control", "no-cache, no-store, must-revalidate")
-		writer.Header().Set("Expires", "0")
+		c.Set("Expires", "0")
-		writer.WriteHeader(http.StatusOK)
+		return c.Status(200).Send(generateResponseTimeBadgeSVG(duration, averageResponseTime, key, cfg))
-		_, _ = writer.Write(generateResponseTimeBadgeSVG(duration, averageResponseTime, key, config))
 	}
 }
 
 // HealthBadge handles the automatic generation of badge based on the group name and endpoint name passed.
-func HealthBadge(writer http.ResponseWriter, request *http.Request) {
+func HealthBadge(c *fiber.Ctx) error {
-	variables := mux.Vars(request)
+	key := c.Params("key")
-	key := variables["key"]
 	pagingConfig := paging.NewEndpointStatusParams()
 	status, err := store.Get().GetEndpointStatusByKey(key, pagingConfig.WithResults(1, 1))
 	if err != nil {
-		if err == common.ErrEndpointNotFound {
+		if errors.Is(err, common.ErrEndpointNotFound) {
-			http.Error(writer, err.Error(), http.StatusNotFound)
+			return c.Status(404).SendString(err.Error())
-		} else if err == common.ErrInvalidTimeRange {
+		} else if errors.Is(err, common.ErrInvalidTimeRange) {
-			http.Error(writer, err.Error(), http.StatusBadRequest)
+			return c.Status(400).SendString(err.Error())
-		} else {
-			http.Error(writer, err.Error(), http.StatusInternalServerError)
 		}
-		return
+		return c.Status(500).SendString(err.Error())
 	}
 	healthStatus := HealthStatusUnknown
 	if len(status.Results) > 0 {
@@ -133,16 +126,47 @@ func HealthBadge(writer http.ResponseWriter, request *http.Request) {
 			healthStatus = HealthStatusDown
 		}
 	}
-	writer.Header().Set("Content-Type", "image/svg+xml")
+	c.Set("Content-Type", "image/svg+xml")
-	writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	c.Set("Cache-Control", "no-cache, no-store, must-revalidate")
-	writer.Header().Set("Expires", "0")
+	c.Set("Expires", "0")
-	writer.WriteHeader(http.StatusOK)
+	return c.Status(200).Send(generateHealthBadgeSVG(healthStatus))
-	_, _ = writer.Write(generateHealthBadgeSVG(healthStatus))
+}
+
+func HealthBadgeShields(c *fiber.Ctx) error {
+	key := c.Params("key")
+	pagingConfig := paging.NewEndpointStatusParams()
+	status, err := store.Get().GetEndpointStatusByKey(key, pagingConfig.WithResults(1, 1))
+	if err != nil {
+		if errors.Is(err, common.ErrEndpointNotFound) {
+			return c.Status(404).SendString(err.Error())
+		} else if errors.Is(err, common.ErrInvalidTimeRange) {
+			return c.Status(400).SendString(err.Error())
+		}
+		return c.Status(500).SendString(err.Error())
+	}
+	healthStatus := HealthStatusUnknown
+	if len(status.Results) > 0 {
+		if status.Results[0].Success {
+			healthStatus = HealthStatusUp
+		} else {
+			healthStatus = HealthStatusDown
+		}
+	}
+	c.Set("Content-Type", "application/json")
+	c.Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	c.Set("Expires", "0")
+	jsonData, err := generateHealthBadgeShields(healthStatus)
+	if err != nil {
+		return c.Status(500).SendString(err.Error())
+	}
+	return c.Status(200).Send(jsonData)
 }
 
 func generateUptimeBadgeSVG(duration string, uptime float64) []byte {
 	var labelWidth, valueWidth, valueWidthAdjustment int
 	switch duration {
+	case "30d":
+		labelWidth = 70
 	case "7d":
 		labelWidth = 65
 	case "24h":
@@ -209,6 +233,8 @@ func getBadgeColorFromUptime(uptime float64) string {
 func generateResponseTimeBadgeSVG(duration string, averageResponseTime int, key string, cfg *config.Config) []byte {
 	var labelWidth, valueWidth int
 	switch duration {
+	case "30d":
+		labelWidth = 110
 	case "7d":
 		labelWidth = 105
 	case "24h":
@@ -255,10 +281,13 @@ func generateResponseTimeBadgeSVG(duration string, averageResponseTime int, key
 }
 
 func getBadgeColorFromResponseTime(responseTime int, key string, cfg *config.Config) string {
-	endpoint := cfg.GetEndpointByKey(key)
+	thresholds := ui.GetDefaultConfig().Badge.ResponseTime.Thresholds
+	if endpoint := cfg.GetEndpointByKey(key); endpoint != nil {
+		thresholds = endpoint.UIConfig.Badge.ResponseTime.Thresholds
+	}
 	// the threshold config requires 5 values, so we can be sure it's set here
 	for i := 0; i < 5; i++ {
-		if responseTime <= endpoint.UIConfig.Badge.ResponseTime.Thresholds[i] {
+		if responseTime <= thresholds[i] {
 			return badgeColors[i]
 		}
 	}
@@ -314,6 +343,17 @@ func generateHealthBadgeSVG(healthStatus string) []byte {
 	return svg
 }
 
+func generateHealthBadgeShields(healthStatus string) ([]byte, error) {
+	color := getBadgeShieldsColorFromHealth(healthStatus)
+	data := map[string]interface{}{
+		"schemaVersion": 1,
+		"label":         "gatus",
+		"message":       healthStatus,
+		"color":         color,
+	}
+	return json.Marshal(data)
+}
+
 func getBadgeColorFromHealth(healthStatus string) string {
 	if healthStatus == HealthStatusUp {
 		return badgeColorHexAwesome
@@ -322,3 +362,12 @@ func getBadgeColorFromHealth(healthStatus string) string {
 	}
 	return badgeColorHexPassable
 }
+
+func getBadgeShieldsColorFromHealth(healthStatus string) string {
+	if healthStatus == HealthStatusUp {
+		return "brightgreen"
+	} else if healthStatus == HealthStatusDown {
+		return "red"
+	}
+	return "yellow"
+}

api/badge_test.go

@@ -1,4 +1,4 @@
-package handler
+package api
 
 import (
 	"net/http"
@@ -8,8 +8,8 @@ import (
 	"time"
 
 	"github.com/TwiN/gatus/v5/config"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
-	"github.com/TwiN/gatus/v5/core/ui"
+	"github.com/TwiN/gatus/v5/config/endpoint/ui"
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/watchdog"
 )
@@ -19,7 +19,7 @@ func TestBadge(t *testing.T) {
 	defer cache.Clear()
 	cfg := &config.Config{
 		Metrics: true,
-		Endpoints: []*core.Endpoint{
+		Endpoints: []*endpoint.Endpoint{
 			{
 				Name:  "frontend",
 				Group: "core",
@@ -31,38 +31,13 @@ func TestBadge(t *testing.T) {
 		},
 	}
 
-	testSuccessfulResult = core.Result{
-		Hostname:              "example.org",
-		IP:                    "127.0.0.1",
-		HTTPStatus:            200,
-		Errors:                nil,
-		Connected:             true,
-		Success:               true,
-		Timestamp:             timestamp,
-		Duration:              150 * time.Millisecond,
-		CertificateExpiration: 10 * time.Hour,
-		ConditionResults: []*core.ConditionResult{
-			{
-				Condition: "[STATUS] == 200",
-				Success:   true,
-			},
-			{
-				Condition: "[RESPONSE_TIME] < 500",
-				Success:   true,
-			},
-			{
-				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
-				Success:   true,
-			},
-		},
-	}
-
 	cfg.Endpoints[0].UIConfig = ui.GetDefaultConfig()
 	cfg.Endpoints[1].UIConfig = ui.GetDefaultConfig()
 
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &core.Result{Success: true, Connected: true, Duration: time.Millisecond, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &endpoint.Result{Success: true, Connected: true, Duration: time.Millisecond, Timestamp: time.Now()})
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &core.Result{Success: false, Connected: false, Duration: time.Second, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &endpoint.Result{Success: false, Connected: false, Duration: time.Second, Timestamp: time.Now()})
-	router := CreateRouter(cfg)
+	api := New(cfg)
+	router := api.Router()
 	type Scenario struct {
 		Name         string
 		Path         string
@@ -135,6 +110,21 @@ func TestBadge(t *testing.T) {
 			Path:         "/api/v1/endpoints/invalid_key/health/badge.svg",
 			ExpectedCode: http.StatusNotFound,
 		},
+		{
+			Name:         "badge-shields-health-up",
+			Path:         "/api/v1/endpoints/core_frontend/health/badge.shields",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badge-shields-health-down",
+			Path:         "/api/v1/endpoints/core_backend/health/badge.shields",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badge-shields-health-for-invalid-key",
+			Path:         "/api/v1/endpoints/invalid_key/health/badge.shields",
+			ExpectedCode: http.StatusNotFound,
+		},
 		{
 			Name:         "chart-response-time-24h",
 			Path:         "/api/v1/endpoints/core_backend/response-times/24h/chart.svg",
@@ -153,14 +143,16 @@ func TestBadge(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", scenario.Path, http.NoBody)
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
 			if scenario.Gzip {
 				request.Header.Set("Accept-Encoding", "gzip")
 			}
-			responseRecorder := httptest.NewRecorder()
+			response, err := router.Test(request)
-			router.ServeHTTP(responseRecorder, request)
+			if err != nil {
-			if responseRecorder.Code != scenario.ExpectedCode {
+				return
-				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
 			}
 		})
 	}
@@ -226,30 +218,30 @@ func TestGetBadgeColorFromResponseTime(t *testing.T) {
 	defer cache.Clear()
 
 	var (
-		firstCondition  = core.Condition("[STATUS] == 200")
+		firstCondition  = endpoint.Condition("[STATUS] == 200")
-		secondCondition = core.Condition("[RESPONSE_TIME] < 500")
+		secondCondition = endpoint.Condition("[RESPONSE_TIME] < 500")
-		thirdCondition  = core.Condition("[CERTIFICATE_EXPIRATION] < 72h")
+		thirdCondition  = endpoint.Condition("[CERTIFICATE_EXPIRATION] < 72h")
 	)
 
-	firstTestEndpoint := core.Endpoint{
+	firstTestEndpoint := endpoint.Endpoint{
 		Name:                    "a",
 		URL:                     "https://example.org/what/ever",
 		Method:                  "GET",
 		Body:                    "body",
 		Interval:                30 * time.Second,
-		Conditions:              []core.Condition{firstCondition, secondCondition, thirdCondition},
+		Conditions:              []endpoint.Condition{firstCondition, secondCondition, thirdCondition},
 		Alerts:                  nil,
 		NumberOfFailuresInARow:  0,
 		NumberOfSuccessesInARow: 0,
 		UIConfig:                ui.GetDefaultConfig(),
 	}
-	secondTestEndpoint := core.Endpoint{
+	secondTestEndpoint := endpoint.Endpoint{
 		Name:                    "b",
 		URL:                     "https://example.org/what/ever",
 		Method:                  "GET",
 		Body:                    "body",
 		Interval:                30 * time.Second,
-		Conditions:              []core.Condition{firstCondition, secondCondition, thirdCondition},
+		Conditions:              []endpoint.Condition{firstCondition, secondCondition, thirdCondition},
 		Alerts:                  nil,
 		NumberOfFailuresInARow:  0,
 		NumberOfSuccessesInARow: 0,
@@ -263,7 +255,33 @@ func TestGetBadgeColorFromResponseTime(t *testing.T) {
 	}
 	cfg := &config.Config{
 		Metrics:   true,
-		Endpoints: []*core.Endpoint{&firstTestEndpoint, &secondTestEndpoint},
+		Endpoints: []*endpoint.Endpoint{&firstTestEndpoint, &secondTestEndpoint},
+	}
+
+	testSuccessfulResult := endpoint.Result{
+		Hostname:              "example.org",
+		IP:                    "127.0.0.1",
+		HTTPStatus:            200,
+		Errors:                nil,
+		Connected:             true,
+		Success:               true,
+		Timestamp:             time.Now(),
+		Duration:              150 * time.Millisecond,
+		CertificateExpiration: 10 * time.Hour,
+		ConditionResults: []*endpoint.ConditionResult{
+			{
+				Condition: "[STATUS] == 200",
+				Success:   true,
+			},
+			{
+				Condition: "[RESPONSE_TIME] < 500",
+				Success:   true,
+			},
+			{
+				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
+				Success:   true,
+			},
+		},
 	}
 
 	store.Get().Insert(&firstTestEndpoint, &testSuccessfulResult)

api/cache.go

@@ -0,0 +1,15 @@
+package api
+
+import (
+	"time"
+
+	"github.com/TwiN/gocache/v2"
+)
+
+const (
+	cacheTTL = 10 * time.Second
+)
+
+var (
+	cache = gocache.NewCache().WithMaxSize(100).WithEvictionPolicy(gocache.FirstInFirstOut)
+)

api/chart.go

@@ -1,7 +1,7 @@
-package handler
+package api
 
 import (
-	"log"
+	"errors"
 	"math"
 	"net/http"
 	"sort"
@@ -9,7 +9,8 @@ import (
 
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/storage/store/common"
-	"github.com/gorilla/mux"
+	"github.com/TwiN/logr"
+	"github.com/gofiber/fiber/v2"
 	"github.com/wcharczuk/go-chart/v2"
 	"github.com/wcharczuk/go-chart/v2/drawing"
 )
@@ -29,33 +30,32 @@ var (
 	}
 )
 
-func ResponseTimeChart(writer http.ResponseWriter, r *http.Request) {
+func ResponseTimeChart(c *fiber.Ctx) error {
-	vars := mux.Vars(r)
+	duration := c.Params("duration")
-	duration := vars["duration"]
+	chartTimestampFormatter := chart.TimeValueFormatterWithFormat(timeFormat)
 	var from time.Time
 	switch duration {
+	case "30d":
+		from = time.Now().Truncate(time.Hour).Add(-30 * 24 * time.Hour)
+		chartTimestampFormatter = chart.TimeDateValueFormatter
 	case "7d":
-		from = time.Now().Truncate(time.Hour).Add(-24 * 7 * time.Hour)
+		from = time.Now().Truncate(time.Hour).Add(-7 * 24 * time.Hour)
 	case "24h":
 		from = time.Now().Truncate(time.Hour).Add(-24 * time.Hour)
 	default:
-		http.Error(writer, "Durations supported: 7d, 24h", http.StatusBadRequest)
+		return c.Status(400).SendString("Durations supported: 30d, 7d, 24h")
-		return
 	}
-	hourlyAverageResponseTime, err := store.Get().GetHourlyAverageResponseTimeByKey(vars["key"], from, time.Now())
+	hourlyAverageResponseTime, err := store.Get().GetHourlyAverageResponseTimeByKey(c.Params("key"), from, time.Now())
 	if err != nil {
-		if err == common.ErrEndpointNotFound {
+		if errors.Is(err, common.ErrEndpointNotFound) {
-			http.Error(writer, err.Error(), http.StatusNotFound)
+			return c.Status(404).SendString(err.Error())
-		} else if err == common.ErrInvalidTimeRange {
+		} else if errors.Is(err, common.ErrInvalidTimeRange) {
-			http.Error(writer, err.Error(), http.StatusBadRequest)
+			return c.Status(400).SendString(err.Error())
-		} else {
-			http.Error(writer, err.Error(), http.StatusInternalServerError)
 		}
-		return
+		return c.Status(500).SendString(err.Error())
 	}
 	if len(hourlyAverageResponseTime) == 0 {
-		http.Error(writer, "", http.StatusNoContent)
+		return c.Status(204).SendString("")
-		return
 	}
 	series := chart.TimeSeries{
 		Name: "Average response time per hour",
@@ -92,7 +92,7 @@ func ResponseTimeChart(writer http.ResponseWriter, r *http.Request) {
 		Width:      1280,
 		Height:     300,
 		XAxis: chart.XAxis{
-			ValueFormatter: chart.TimeValueFormatterWithFormat(timeFormat),
+			ValueFormatter: chartTimestampFormatter,
 			GridMajorStyle: gridStyle,
 			GridMinorStyle: gridStyle,
 			Style:          axisStyle,
@@ -111,12 +111,13 @@ func ResponseTimeChart(writer http.ResponseWriter, r *http.Request) {
 		},
 		Series: []chart.Series{series},
 	}
-	writer.Header().Set("Content-Type", "image/svg+xml")
+	c.Set("Content-Type", "image/svg+xml")
-	writer.Header().Set("Cache-Control", "no-cache, no-store")
+	c.Set("Cache-Control", "no-cache, no-store")
-	writer.Header().Set("Expires", "0")
+	c.Set("Expires", "0")
-	writer.WriteHeader(http.StatusOK)
+	c.Status(http.StatusOK)
-	if err := graph.Render(chart.SVG, writer); err != nil {
+	if err := graph.Render(chart.SVG, c); err != nil {
-		log.Println("[handler][ResponseTimeChart] Failed to render response time chart:", err.Error())
+		logr.Errorf("[api.ResponseTimeChart] Failed to render response time chart: %s", err.Error())
-		return
+		return c.Status(500).SendString(err.Error())
 	}
+	return nil
 }

api/chart_test.go

@@ -1,4 +1,4 @@
-package handler
+package api
 
 import (
 	"net/http"
@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/TwiN/gatus/v5/config"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/watchdog"
 )
@@ -17,7 +17,7 @@ func TestResponseTimeChart(t *testing.T) {
 	defer cache.Clear()
 	cfg := &config.Config{
 		Metrics: true,
-		Endpoints: []*core.Endpoint{
+		Endpoints: []*endpoint.Endpoint{
 			{
 				Name:  "frontend",
 				Group: "core",
@@ -28,9 +28,10 @@ func TestResponseTimeChart(t *testing.T) {
 			},
 		},
 	}
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &core.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &endpoint.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &core.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &endpoint.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
-	router := CreateRouter(cfg)
+	api := New(cfg)
+	router := api.Router()
 	type Scenario struct {
 		Name         string
 		Path         string
@@ -48,6 +49,11 @@ func TestResponseTimeChart(t *testing.T) {
 			Path:         "/api/v1/endpoints/core_frontend/response-times/7d/chart.svg",
 			ExpectedCode: http.StatusOK,
 		},
+		{
+			Name:         "chart-response-time-30d",
+			Path:         "/api/v1/endpoints/core_frontend/response-times/30d/chart.svg",
+			ExpectedCode: http.StatusOK,
+		},
 		{
 			Name:         "chart-response-time-with-invalid-duration",
 			Path:         "/api/v1/endpoints/core_backend/response-times/3d/chart.svg",
@@ -61,14 +67,16 @@ func TestResponseTimeChart(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", scenario.Path, http.NoBody)
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
 			if scenario.Gzip {
 				request.Header.Set("Accept-Encoding", "gzip")
 			}
-			responseRecorder := httptest.NewRecorder()
+			response, err := router.Test(request)
-			router.ServeHTTP(responseRecorder, request)
+			if err != nil {
-			if responseRecorder.Code != scenario.ExpectedCode {
+				return
-				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
 			}
 		})
 	}

api/config.go

@@ -0,0 +1,25 @@
+package api
+
+import (
+	"fmt"
+
+	"github.com/TwiN/gatus/v5/security"
+	"github.com/gofiber/fiber/v2"
+)
+
+type ConfigHandler struct {
+	securityConfig *security.Config
+}
+
+func (handler ConfigHandler) GetConfig(c *fiber.Ctx) error {
+	hasOIDC := false
+	isAuthenticated := true // Default to true if no security config is set
+	if handler.securityConfig != nil {
+		hasOIDC = handler.securityConfig.OIDC != nil
+		isAuthenticated = handler.securityConfig.IsAuthenticated(c)
+	}
+	// Return the config
+	c.Set("Content-Type", "application/json")
+	return c.Status(200).
+		SendString(fmt.Sprintf(`{"oidc":%v,"authenticated":%v}`, hasOIDC, isAuthenticated))
+}

api/config_test.go

@@ -1,12 +1,12 @@
-package handler
+package api
 
 import (
+	"io"
 	"net/http"
-	"net/http/httptest"
 	"testing"
 
 	"github.com/TwiN/gatus/v5/security"
-	"github.com/gorilla/mux"
+	"github.com/gofiber/fiber/v2"
 )
 
 func TestConfigHandler_ServeHTTP(t *testing.T) {
@@ -20,15 +20,27 @@ func TestConfigHandler_ServeHTTP(t *testing.T) {
 	}
 	handler := ConfigHandler{securityConfig: securityConfig}
 	// Create a fake router. We're doing this because I need the gate to be initialized.
-	securityConfig.ApplySecurityMiddleware(mux.NewRouter())
+	app := fiber.New()
+	app.Get("/api/v1/config", handler.GetConfig)
+	err := securityConfig.ApplySecurityMiddleware(app)
+	if err != nil {
+		t.Error("expected err to be nil, but was", err)
+	}
 	// Test the config handler
 	request, _ := http.NewRequest("GET", "/api/v1/config", http.NoBody)
-	responseRecorder := httptest.NewRecorder()
+	response, err := app.Test(request)
-	handler.ServeHTTP(responseRecorder, request)
+	if err != nil {
-	if responseRecorder.Code != http.StatusOK {
+		t.Error("expected err to be nil, but was", err)
-		t.Error("expected code to be 200, but was", responseRecorder.Code)
 	}
-	if responseRecorder.Body.String() != `{"oidc":true,"authenticated":false}` {
+	defer response.Body.Close()
-		t.Error("expected body to be `{\"oidc\":true,\"authenticated\":false}`, but was", responseRecorder.Body.String())
+	if response.StatusCode != http.StatusOK {
+		t.Error("expected code to be 200, but was", response.StatusCode)
+	}
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		t.Error("expected err to be nil, but was", err)
+	}
+	if string(body) != `{"oidc":true,"authenticated":false}` {
+		t.Error("expected body to be `{\"oidc\":true,\"authenticated\":false}`, but was", string(body))
 	}
 }

api/endpoint_status.go

@@ -0,0 +1,101 @@
+package api
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/config/remote"
+	"github.com/TwiN/gatus/v5/storage/store"
+	"github.com/TwiN/gatus/v5/storage/store/common"
+	"github.com/TwiN/gatus/v5/storage/store/common/paging"
+	"github.com/TwiN/logr"
+	"github.com/gofiber/fiber/v2"
+)
+
+// EndpointStatuses handles requests to retrieve all EndpointStatus
+// Due to how intensive this operation can be on the storage, this function leverages a cache.
+func EndpointStatuses(cfg *config.Config) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		page, pageSize := extractPageAndPageSizeFromRequest(c)
+		value, exists := cache.Get(fmt.Sprintf("endpoint-status-%d-%d", page, pageSize))
+		var data []byte
+		if !exists {
+			endpointStatuses, err := store.Get().GetAllEndpointStatuses(paging.NewEndpointStatusParams().WithResults(page, pageSize))
+			if err != nil {
+				logr.Errorf("[api.EndpointStatuses] Failed to retrieve endpoint statuses: %s", err.Error())
+				return c.Status(500).SendString(err.Error())
+			}
+			// ALPHA: Retrieve endpoint statuses from remote instances
+			if endpointStatusesFromRemote, err := getEndpointStatusesFromRemoteInstances(cfg.Remote); err != nil {
+				logr.Errorf("[handler.EndpointStatuses] Silently failed to retrieve endpoint statuses from remote: %s", err.Error())
+			} else if endpointStatusesFromRemote != nil {
+				endpointStatuses = append(endpointStatuses, endpointStatusesFromRemote...)
+			}
+			// Marshal endpoint statuses to JSON
+			data, err = json.Marshal(endpointStatuses)
+			if err != nil {
+				logr.Errorf("[api.EndpointStatuses] Unable to marshal object to JSON: %s", err.Error())
+				return c.Status(500).SendString("unable to marshal object to JSON")
+			}
+			cache.SetWithTTL(fmt.Sprintf("endpoint-status-%d-%d", page, pageSize), data, cacheTTL)
+		} else {
+			data = value.([]byte)
+		}
+		c.Set("Content-Type", "application/json")
+		return c.Status(200).Send(data)
+	}
+}
+
+func getEndpointStatusesFromRemoteInstances(remoteConfig *remote.Config) ([]*endpoint.Status, error) {
+	if remoteConfig == nil || len(remoteConfig.Instances) == 0 {
+		return nil, nil
+	}
+	var endpointStatusesFromAllRemotes []*endpoint.Status
+	httpClient := client.GetHTTPClient(remoteConfig.ClientConfig)
+	for _, instance := range remoteConfig.Instances {
+		response, err := httpClient.Get(instance.URL)
+		if err != nil {
+			return nil, err
+		}
+		var endpointStatuses []*endpoint.Status
+		if err = json.NewDecoder(response.Body).Decode(&endpointStatuses); err != nil {
+			_ = response.Body.Close()
+			logr.Errorf("[api.getEndpointStatusesFromRemoteInstances] Silently failed to retrieve endpoint statuses from %s: %s", instance.URL, err.Error())
+			continue
+		}
+		_ = response.Body.Close()
+		for _, endpointStatus := range endpointStatuses {
+			endpointStatus.Name = instance.EndpointPrefix + endpointStatus.Name
+		}
+		endpointStatusesFromAllRemotes = append(endpointStatusesFromAllRemotes, endpointStatuses...)
+	}
+	return endpointStatusesFromAllRemotes, nil
+}
+
+// EndpointStatus retrieves a single endpoint.Status by group and endpoint name
+func EndpointStatus(c *fiber.Ctx) error {
+	page, pageSize := extractPageAndPageSizeFromRequest(c)
+	endpointStatus, err := store.Get().GetEndpointStatusByKey(c.Params("key"), paging.NewEndpointStatusParams().WithResults(page, pageSize).WithEvents(1, common.MaximumNumberOfEvents))
+	if err != nil {
+		if errors.Is(err, common.ErrEndpointNotFound) {
+			return c.Status(404).SendString(err.Error())
+		}
+		logr.Errorf("[api.EndpointStatus] Failed to retrieve endpoint status: %s", err.Error())
+		return c.Status(500).SendString(err.Error())
+	}
+	if endpointStatus == nil { // XXX: is this check necessary?
+		logr.Errorf("[api.EndpointStatus] Endpoint with key=%s not found", c.Params("key"))
+		return c.Status(404).SendString("not found")
+	}
+	output, err := json.Marshal(endpointStatus)
+	if err != nil {
+		logr.Errorf("[api.EndpointStatus] Unable to marshal object to JSON: %s", err.Error())
+		return c.Status(500).SendString("unable to marshal object to JSON")
+	}
+	c.Set("Content-Type", "application/json")
+	return c.Status(200).Send(output)
+}

api/endpoint_status_test.go

@@ -1,13 +1,14 @@
-package handler
+package api
 
 import (
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 	"time"
 
 	"github.com/TwiN/gatus/v5/config"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/watchdog"
 )
@@ -15,19 +16,19 @@ import (
 var (
 	timestamp = time.Now()
 
-	testEndpoint = core.Endpoint{
+	testEndpoint = endpoint.Endpoint{
 		Name:                    "name",
 		Group:                   "group",
 		URL:                     "https://example.org/what/ever",
 		Method:                  "GET",
 		Body:                    "body",
 		Interval:                30 * time.Second,
-		Conditions:              []core.Condition{core.Condition("[STATUS] == 200"), core.Condition("[RESPONSE_TIME] < 500"), core.Condition("[CERTIFICATE_EXPIRATION] < 72h")},
+		Conditions:              []endpoint.Condition{endpoint.Condition("[STATUS] == 200"), endpoint.Condition("[RESPONSE_TIME] < 500"), endpoint.Condition("[CERTIFICATE_EXPIRATION] < 72h")},
 		Alerts:                  nil,
 		NumberOfFailuresInARow:  0,
 		NumberOfSuccessesInARow: 0,
 	}
-	testSuccessfulResult = core.Result{
+	testSuccessfulResult = endpoint.Result{
 		Hostname:              "example.org",
 		IP:                    "127.0.0.1",
 		HTTPStatus:            200,
@@ -37,7 +38,7 @@ var (
 		Timestamp:             timestamp,
 		Duration:              150 * time.Millisecond,
 		CertificateExpiration: 10 * time.Hour,
-		ConditionResults: []*core.ConditionResult{
+		ConditionResults: []*endpoint.ConditionResult{
 			{
 				Condition: "[STATUS] == 200",
 				Success:   true,
@@ -52,7 +53,7 @@ var (
 			},
 		},
 	}
-	testUnsuccessfulResult = core.Result{
+	testUnsuccessfulResult = endpoint.Result{
 		Hostname:              "example.org",
 		IP:                    "127.0.0.1",
 		HTTPStatus:            200,
@@ -62,7 +63,7 @@ var (
 		Timestamp:             timestamp,
 		Duration:              750 * time.Millisecond,
 		CertificateExpiration: 10 * time.Hour,
-		ConditionResults: []*core.ConditionResult{
+		ConditionResults: []*endpoint.ConditionResult{
 			{
 				Condition: "[STATUS] == 200",
 				Success:   true,
@@ -84,7 +85,7 @@ func TestEndpointStatus(t *testing.T) {
 	defer cache.Clear()
 	cfg := &config.Config{
 		Metrics: true,
-		Endpoints: []*core.Endpoint{
+		Endpoints: []*endpoint.Endpoint{
 			{
 				Name:  "frontend",
 				Group: "core",
@@ -95,10 +96,10 @@ func TestEndpointStatus(t *testing.T) {
 			},
 		},
 	}
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &core.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &endpoint.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &core.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &endpoint.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
-	router := CreateRouter(cfg)
+	api := New(cfg)
-
+	router := api.Router()
 	type Scenario struct {
 		Name         string
 		Path         string
@@ -130,14 +131,16 @@ func TestEndpointStatus(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", scenario.Path, http.NoBody)
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
 			if scenario.Gzip {
 				request.Header.Set("Accept-Encoding", "gzip")
 			}
-			responseRecorder := httptest.NewRecorder()
+			response, err := router.Test(request)
-			router.ServeHTTP(responseRecorder, request)
+			if err != nil {
-			if responseRecorder.Code != scenario.ExpectedCode {
+				return
-				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
 			}
 		})
 	}
@@ -153,8 +156,8 @@ func TestEndpointStatuses(t *testing.T) {
 	// Can't be bothered dealing with timezone issues on the worker that runs the automated tests
 	firstResult.Timestamp = time.Time{}
 	secondResult.Timestamp = time.Time{}
-	router := CreateRouter(&config.Config{Metrics: true})
+	api := New(&config.Config{Metrics: true})
-
+	router := api.Router()
 	type Scenario struct {
 		Name         string
 		Path         string
@@ -196,15 +199,21 @@ func TestEndpointStatuses(t *testing.T) {
 
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", scenario.Path, http.NoBody)
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
-			responseRecorder := httptest.NewRecorder()
+			response, err := router.Test(request)
-			router.ServeHTTP(responseRecorder, request)
+			if err != nil {
-			if responseRecorder.Code != scenario.ExpectedCode {
+				return
-				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
 			}
-			output := responseRecorder.Body.String()
+			defer response.Body.Close()
-			if output != scenario.ExpectedBody {
+			if response.StatusCode != scenario.ExpectedCode {
-				t.Errorf("expected:\n %s\n\ngot:\n %s", scenario.ExpectedBody, output)
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
+			}
+			body, err := io.ReadAll(response.Body)
+			if err != nil {
+				t.Error("expected err to be nil, but was", err)
+			}
+			if string(body) != scenario.ExpectedBody {
+				t.Errorf("expected:\n %s\n\ngot:\n %s", scenario.ExpectedBody, string(body))
 			}
 		})
 	}

api/external_endpoint.go

@@ -0,0 +1,70 @@
+package api
+
+import (
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/storage/store"
+	"github.com/TwiN/gatus/v5/storage/store/common"
+	"github.com/TwiN/gatus/v5/watchdog"
+	"github.com/TwiN/logr"
+	"github.com/gofiber/fiber/v2"
+)
+
+func CreateExternalEndpointResult(cfg *config.Config) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		// Check if the success query parameter is present
+		success, exists := c.Queries()["success"]
+		if !exists || (success != "true" && success != "false") {
+			return c.Status(400).SendString("missing or invalid success query parameter")
+		}
+		// Check if the authorization bearer token header is correct
+		authorizationHeader := string(c.Request().Header.Peek("Authorization"))
+		if !strings.HasPrefix(authorizationHeader, "Bearer ") {
+			return c.Status(401).SendString("invalid Authorization header")
+		}
+		token := strings.TrimSpace(strings.TrimPrefix(authorizationHeader, "Bearer "))
+		if len(token) == 0 {
+			return c.Status(401).SendString("bearer token must not be empty")
+		}
+		key := c.Params("key")
+		externalEndpoint := cfg.GetExternalEndpointByKey(key)
+		if externalEndpoint == nil {
+			logr.Errorf("[api.CreateExternalEndpointResult] External endpoint with key=%s not found", key)
+			return c.Status(404).SendString("not found")
+		}
+		if externalEndpoint.Token != token {
+			logr.Errorf("[api.CreateExternalEndpointResult] Invalid token for external endpoint with key=%s", key)
+			return c.Status(401).SendString("invalid token")
+		}
+		// Persist the result in the storage
+		result := &endpoint.Result{
+			Timestamp: time.Now(),
+			Success:   c.QueryBool("success"),
+			Errors:    []string{},
+		}
+		if !result.Success && c.Query("error") != "" {
+			result.Errors = append(result.Errors, c.Query("error"))
+		}
+		convertedEndpoint := externalEndpoint.ToEndpoint()
+		if err := store.Get().Insert(convertedEndpoint, result); err != nil {
+			if errors.Is(err, common.ErrEndpointNotFound) {
+				return c.Status(404).SendString(err.Error())
+			}
+			logr.Errorf("[api.CreateExternalEndpointResult] Failed to insert result in storage: %s", err.Error())
+			return c.Status(500).SendString(err.Error())
+		}
+		logr.Infof("[api.CreateExternalEndpointResult] Successfully inserted result for external endpoint with key=%s and success=%s", c.Params("key"), success)
+		// Check if an alert should be triggered or resolved
+		if !cfg.Maintenance.IsUnderMaintenance() {
+			watchdog.HandleAlerting(convertedEndpoint, result, cfg.Alerting)
+			externalEndpoint.NumberOfSuccessesInARow = convertedEndpoint.NumberOfSuccessesInARow
+			externalEndpoint.NumberOfFailuresInARow = convertedEndpoint.NumberOfFailuresInARow
+		}
+		// Return the result
+		return c.Status(200).SendString("")
+	}
+}

api/external_endpoint_test.go

@@ -0,0 +1,161 @@
+package api
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting"
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/alerting/provider/discord"
+	"github.com/TwiN/gatus/v5/config"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/config/maintenance"
+	"github.com/TwiN/gatus/v5/storage/store"
+	"github.com/TwiN/gatus/v5/storage/store/common/paging"
+)
+
+func TestCreateExternalEndpointResult(t *testing.T) {
+	defer store.Get().Clear()
+	defer cache.Clear()
+	cfg := &config.Config{
+		Alerting: &alerting.Config{
+			Discord: &discord.AlertProvider{},
+		},
+		ExternalEndpoints: []*endpoint.ExternalEndpoint{
+			{
+				Name:  "n",
+				Group: "g",
+				Token: "token",
+				Alerts: []*alert.Alert{
+					{
+						Type:             alert.TypeDiscord,
+						FailureThreshold: 2,
+						SuccessThreshold: 2,
+					},
+				},
+			},
+		},
+		Maintenance: &maintenance.Config{},
+	}
+	api := New(cfg)
+	router := api.Router()
+	scenarios := []struct {
+		Name                           string
+		Path                           string
+		AuthorizationHeaderBearerToken string
+		ExpectedCode                   int
+	}{
+		{
+			Name:                           "no-token",
+			Path:                           "/api/v1/endpoints/g_n/external?success=true",
+			AuthorizationHeaderBearerToken: "",
+			ExpectedCode:                   401,
+		},
+		{
+			Name:                           "bad-token",
+			Path:                           "/api/v1/endpoints/g_n/external?success=true",
+			AuthorizationHeaderBearerToken: "Bearer bad-token",
+			ExpectedCode:                   401,
+		},
+		{
+			Name:                           "bad-key",
+			Path:                           "/api/v1/endpoints/bad_key/external?success=true",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   404,
+		},
+		{
+			Name:                           "bad-success-value",
+			Path:                           "/api/v1/endpoints/g_n/external?success=invalid",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   400,
+		},
+		{
+			Name:                           "good-token-success-true",
+			Path:                           "/api/v1/endpoints/g_n/external?success=true",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   200,
+		},
+		{
+			Name:                           "good-token-success-true-with-ignored-error-because-success-true",
+			Path:                           "/api/v1/endpoints/g_n/external?success=true&error=failed",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   200,
+		},
+		{
+			Name:                           "good-token-success-false",
+			Path:                           "/api/v1/endpoints/g_n/external?success=false",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   200,
+		},
+		{
+			Name:                           "good-token-success-false-again",
+			Path:                           "/api/v1/endpoints/g_n/external?success=false",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   200,
+		},
+		{
+			Name:                           "good-token-success-false-with-error",
+			Path:                           "/api/v1/endpoints/g_n/external?success=false&error=failed",
+			AuthorizationHeaderBearerToken: "Bearer token",
+			ExpectedCode:                   200,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			request := httptest.NewRequest("POST", scenario.Path, http.NoBody)
+			if len(scenario.AuthorizationHeaderBearerToken) > 0 {
+				request.Header.Set("Authorization", scenario.AuthorizationHeaderBearerToken)
+			}
+			response, err := router.Test(request)
+			if err != nil {
+				return
+			}
+			defer response.Body.Close()
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
+			}
+		})
+	}
+	t.Run("verify-end-results", func(t *testing.T) {
+		endpointStatus, err := store.Get().GetEndpointStatus("g", "n", paging.NewEndpointStatusParams().WithResults(1, 10))
+		if err != nil {
+			t.Errorf("failed to get endpoint status: %s", err.Error())
+			return
+		}
+		if endpointStatus.Key != "g_n" {
+			t.Errorf("expected key to be g_n but got %s", endpointStatus.Key)
+		}
+		if len(endpointStatus.Results) != 5 {
+			t.Errorf("expected 3 results but got %d", len(endpointStatus.Results))
+		}
+		if !endpointStatus.Results[0].Success {
+			t.Errorf("expected first result to be successful")
+		}
+		if !endpointStatus.Results[1].Success {
+			t.Errorf("expected second result to be successful")
+		}
+		if len(endpointStatus.Results[1].Errors) > 0 {
+			t.Errorf("expected second result to have no errors")
+		}
+		if endpointStatus.Results[2].Success {
+			t.Errorf("expected third result to be unsuccessful")
+		}
+		if endpointStatus.Results[3].Success {
+			t.Errorf("expected fourth result to be unsuccessful")
+		}
+		if endpointStatus.Results[4].Success {
+			t.Errorf("expected fifth result to be unsuccessful")
+		}
+		if len(endpointStatus.Results[4].Errors) == 0 || endpointStatus.Results[4].Errors[0] != "failed" {
+			t.Errorf("expected fifth result to have errors: failed")
+		}
+		externalEndpointFromConfig := cfg.GetExternalEndpointByKey("g_n")
+		if externalEndpointFromConfig.NumberOfFailuresInARow != 3 {
+			t.Errorf("expected 3 failures in a row but got %d", externalEndpointFromConfig.NumberOfFailuresInARow)
+		}
+		if externalEndpointFromConfig.NumberOfSuccessesInARow != 0 {
+			t.Errorf("expected 0 successes in a row but got %d", externalEndpointFromConfig.NumberOfSuccessesInARow)
+		}
+	})
+}

api/spa.go

@@ -0,0 +1,30 @@
+package api
+
+import (
+	_ "embed"
+	"html/template"
+
+	"github.com/TwiN/gatus/v5/config/ui"
+	static "github.com/TwiN/gatus/v5/web"
+	"github.com/TwiN/logr"
+	"github.com/gofiber/fiber/v2"
+)
+
+func SinglePageApplication(ui *ui.Config) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		t, err := template.ParseFS(static.FileSystem, static.IndexPath)
+		if err != nil {
+			// This should never happen, because ui.ValidateAndSetDefaults validates that the template works.
+			logr.Errorf("[api.SinglePageApplication] Failed to parse template. This should never happen, because the template is validated on start. Error: %s", err.Error())
+			return c.Status(500).SendString("Failed to parse template. This should never happen, because the template is validated on start.")
+		}
+		c.Set("Content-Type", "text/html")
+		err = t.Execute(c, ui)
+		if err != nil {
+			// This should never happen, because ui.ValidateAndSetDefaults validates that the template works.
+			logr.Errorf("[api.SinglePageApplication] Failed to execute template. This should never happen, because the template is validated on start. Error: %s", err.Error())
+			return c.Status(500).SendString("Failed to parse template. This should never happen, because the template is validated on start.")
+		}
+		return c.SendStatus(200)
+	}
+}

api/spa_test.go

@@ -1,13 +1,16 @@
-package handler
+package api
 
 import (
+	"io"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/TwiN/gatus/v5/config"
-	"github.com/TwiN/gatus/v5/core"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/config/ui"
 	"github.com/TwiN/gatus/v5/storage/store"
 	"github.com/TwiN/gatus/v5/watchdog"
 )
@@ -17,7 +20,7 @@ func TestSinglePageApplication(t *testing.T) {
 	defer cache.Clear()
 	cfg := &config.Config{
 		Metrics: true,
-		Endpoints: []*core.Endpoint{
+		Endpoints: []*endpoint.Endpoint{
 			{
 				Name:  "frontend",
 				Group: "core",
@@ -27,10 +30,14 @@ func TestSinglePageApplication(t *testing.T) {
 				Group: "core",
 			},
 		},
+		UI: &ui.Config{
+			Title: "example-title",
+		},
 	}
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &core.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[0], &endpoint.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
-	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &core.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
+	watchdog.UpdateEndpointStatuses(cfg.Endpoints[1], &endpoint.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
-	router := CreateRouter(cfg)
+	api := New(cfg)
+	router := api.Router()
 	type Scenario struct {
 		Name         string
 		Path         string
@@ -41,24 +48,31 @@ func TestSinglePageApplication(t *testing.T) {
 		{
 			Name:         "frontend-home",
 			Path:         "/",
-			ExpectedCode: http.StatusOK,
+			ExpectedCode: 200,
 		},
 		{
 			Name:         "frontend-endpoint",
 			Path:         "/endpoints/core_frontend",
-			ExpectedCode: http.StatusOK,
+			ExpectedCode: 200,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", scenario.Path, http.NoBody)
+			request := httptest.NewRequest("GET", scenario.Path, http.NoBody)
 			if scenario.Gzip {
 				request.Header.Set("Accept-Encoding", "gzip")
 			}
-			responseRecorder := httptest.NewRecorder()
+			response, err := router.Test(request)
-			router.ServeHTTP(responseRecorder, request)
+			if err != nil {
-			if responseRecorder.Code != scenario.ExpectedCode {
+				return
-				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+			defer response.Body.Close()
+			if response.StatusCode != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, response.StatusCode)
+			}
+			body, _ := io.ReadAll(response.Body)
+			if !strings.Contains(string(body), cfg.UI.Title) {
+				t.Errorf("%s %s should have contained the title", request.Method, request.URL)
 			}
 		})
 	}

api/util.go

@@ -1,10 +1,10 @@
-package handler
+package api
 
 import (
-	"net/http"
 	"strconv"
 
 	"github.com/TwiN/gatus/v5/storage/store/common"
+	"github.com/gofiber/fiber/v2"
 )
 
 const (
@@ -18,9 +18,9 @@ const (
 	MaximumPageSize = common.MaximumNumberOfResults
 )
 
-func extractPageAndPageSizeFromRequest(r *http.Request) (page int, pageSize int) {
+func extractPageAndPageSizeFromRequest(c *fiber.Ctx) (page, pageSize int) {
 	var err error
-	if pageParameter := r.URL.Query().Get("page"); len(pageParameter) == 0 {
+	if pageParameter := c.Query("page"); len(pageParameter) == 0 {
 		page = DefaultPage
 	} else {
 		page, err = strconv.Atoi(pageParameter)
@@ -31,7 +31,7 @@ func extractPageAndPageSizeFromRequest(r *http.Request) (page int, pageSize int)
 			page = DefaultPage
 		}
 	}
-	if pageSizeParameter := r.URL.Query().Get("pageSize"); len(pageSizeParameter) == 0 {
+	if pageSizeParameter := c.Query("pageSize"); len(pageSizeParameter) == 0 {
 		pageSize = DefaultPageSize
 	} else {
 		pageSize, err = strconv.Atoi(pageSizeParameter)

api/util_test.go

@@ -1,9 +1,11 @@
-package handler
+package api
 
 import (
 	"fmt"
-	"net/http"
 	"testing"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/valyala/fasthttp"
 )
 
 func TestExtractPageAndPageSizeFromRequest(t *testing.T) {
@@ -54,8 +56,12 @@ func TestExtractPageAndPageSizeFromRequest(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run("page-"+scenario.Page+"-pageSize-"+scenario.PageSize, func(t *testing.T) {
-			request, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/statuses?page=%s&pageSize=%s", scenario.Page, scenario.PageSize), http.NoBody)
+			//request := httptest.NewRequest("GET", fmt.Sprintf("/api/v1/statuses?page=%s&pageSize=%s", scenario.Page, scenario.PageSize), http.NoBody)
-			actualPage, actualPageSize := extractPageAndPageSizeFromRequest(request)
+			app := fiber.New()
+			c := app.AcquireCtx(&fasthttp.RequestCtx{})
+			defer app.ReleaseCtx(c)
+			c.Request().SetRequestURI(fmt.Sprintf("/api/v1/statuses?page=%s&pageSize=%s", scenario.Page, scenario.PageSize))
+			actualPage, actualPageSize := extractPageAndPageSizeFromRequest(c)
 			if actualPage != scenario.ExpectedPage {
 				t.Errorf("expected %d, got %d", scenario.ExpectedPage, actualPage)
 			}

client/client.go

@@ -3,6 +3,7 @@ package client
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net"
@@ -14,8 +15,15 @@ import (
 
 	"github.com/TwiN/gocache/v2"
 	"github.com/TwiN/whois"
-	"github.com/go-ping/ping"
 	"github.com/ishidawataru/sctp"
+	"github.com/miekg/dns"
+	ping "github.com/prometheus-community/pro-bing"
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/net/websocket"
+)
+
+const (
+	dnsPort = 53
 )
 
 var (
@@ -102,7 +110,6 @@ func CanCreateSCTPConnection(address string, config *Config) bool {
 		_ = conn.Close()
 		res <- true
 	})(ch)
-
 	select {
 	case result := <-ch:
 		return result
@@ -142,35 +149,97 @@ func CanPerformStartTLS(address string, config *Config) (connected bool, certifi
 
 // CanPerformTLS checks whether a connection can be established to an address using the TLS protocol
 func CanPerformTLS(address string, config *Config) (connected bool, certificate *x509.Certificate, err error) {
-	connection, err := tls.DialWithDialer(&net.Dialer{Timeout: config.Timeout}, "tcp", address, nil)
+	connection, err := tls.DialWithDialer(&net.Dialer{Timeout: config.Timeout}, "tcp", address, &tls.Config{
+		InsecureSkipVerify: config.Insecure,
+	})
 	if err != nil {
 		return
 	}
 	defer connection.Close()
 	verifiedChains := connection.ConnectionState().VerifiedChains
+	// If config.Insecure is set to true, verifiedChains will be an empty list []
+	// We should get the parsed certificates from PeerCertificates, it can't be empty on the client side
+	// Reference: https://pkg.go.dev/crypto/tls#PeerCertificates
 	if len(verifiedChains) == 0 || len(verifiedChains[0]) == 0 {
-		return
+		peerCertificates := connection.ConnectionState().PeerCertificates
+		return true, peerCertificates[0], nil
 	}
 	return true, verifiedChains[0][0], nil
 }
 
+// CanCreateSSHConnection checks whether a connection can be established and a command can be executed to an address
+// using the SSH protocol.
+func CanCreateSSHConnection(address, username, password string, config *Config) (bool, *ssh.Client, error) {
+	var port string
+	if strings.Contains(address, ":") {
+		addressAndPort := strings.Split(address, ":")
+		if len(addressAndPort) != 2 {
+			return false, nil, errors.New("invalid address for ssh, format must be host:port")
+		}
+		address = addressAndPort[0]
+		port = addressAndPort[1]
+	} else {
+		port = "22"
+	}
+	cli, err := ssh.Dial("tcp", strings.Join([]string{address, port}, ":"), &ssh.ClientConfig{
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+		User:            username,
+		Auth: []ssh.AuthMethod{
+			ssh.Password(password),
+		},
+		Timeout: config.Timeout,
+	})
+	if err != nil {
+		return false, nil, err
+	}
+	return true, cli, nil
+}
+
+// ExecuteSSHCommand executes a command to an address using the SSH protocol.
+func ExecuteSSHCommand(sshClient *ssh.Client, body string, config *Config) (bool, int, error) {
+	type Body struct {
+		Command string `json:"command"`
+	}
+	defer sshClient.Close()
+	var b Body
+	if err := json.Unmarshal([]byte(body), &b); err != nil {
+		return false, 0, err
+	}
+	sess, err := sshClient.NewSession()
+	if err != nil {
+		return false, 0, err
+	}
+	err = sess.Start(b.Command)
+	if err != nil {
+		return false, 0, err
+	}
+	defer sess.Close()
+	err = sess.Wait()
+	if err == nil {
+		return true, 0, nil
+	}
+	var exitErr *ssh.ExitError
+	if ok := errors.As(err, &exitErr); !ok {
+		return false, 0, err
+	}
+	return true, exitErr.ExitStatus(), nil
+}
+
 // Ping checks if an address can be pinged and returns the round-trip time if the address can be pinged
 //
 // Note that this function takes at least 100ms, even if the address is 127.0.0.1
 func Ping(address string, config *Config) (bool, time.Duration) {
-	pinger, err := ping.NewPinger(address)
+	pinger := ping.New(address)
-	if err != nil {
-		return false, 0
-	}
 	pinger.Count = 1
 	pinger.Timeout = config.Timeout
 	// Set the pinger's privileged mode to true for every GOOS except darwin
 	// See https://github.com/TwiN/gatus/issues/132
 	//
 	// Note that for this to work on Linux, Gatus must run with sudo privileges.
-	// See https://github.com/go-ping/ping#linux
+	// See https://github.com/prometheus-community/pro-bing#linux
 	pinger.SetPrivileged(runtime.GOOS != "darwin")
-	err = pinger.Run()
+	pinger.SetNetwork(config.Network)
+	err := pinger.Run()
 	if err != nil {
 		return false, 0
 	}
@@ -184,6 +253,85 @@ func Ping(address string, config *Config) (bool, time.Duration) {
 	return true, 0
 }
 
+// QueryWebSocket opens a websocket connection, write `body` and return a message from the server
+func QueryWebSocket(address, body string, config *Config) (bool, []byte, error) {
+	const (
+		Origin             = "http://localhost/"
+		MaximumMessageSize = 1024 // in bytes
+	)
+	wsConfig, err := websocket.NewConfig(address, Origin)
+	if err != nil {
+		return false, nil, fmt.Errorf("error configuring websocket connection: %w", err)
+	}
+	if config != nil {
+		wsConfig.Dialer = &net.Dialer{Timeout: config.Timeout}
+	}
+	// Dial URL
+	ws, err := websocket.DialConfig(wsConfig)
+	if err != nil {
+		return false, nil, fmt.Errorf("error dialing websocket: %w", err)
+	}
+	defer ws.Close()
+	// Write message
+	if _, err := ws.Write([]byte(body)); err != nil {
+		return false, nil, fmt.Errorf("error writing websocket body: %w", err)
+	}
+	// Read message
+	var n int
+	msg := make([]byte, MaximumMessageSize)
+	if n, err = ws.Read(msg); err != nil {
+		return false, nil, fmt.Errorf("error reading websocket message: %w", err)
+	}
+	return true, msg[:n], nil
+}
+
+func QueryDNS(queryType, queryName, url string) (connected bool, dnsRcode string, body []byte, err error) {
+	if !strings.Contains(url, ":") {
+		url = fmt.Sprintf("%s:%d", url, dnsPort)
+	}
+	queryTypeAsUint16 := dns.StringToType[queryType]
+	c := new(dns.Client)
+	m := new(dns.Msg)
+	m.SetQuestion(queryName, queryTypeAsUint16)
+	r, _, err := c.Exchange(m, url)
+	if err != nil {
+		return false, "", nil, err
+	}
+	connected = true
+	dnsRcode = dns.RcodeToString[r.Rcode]
+	for _, rr := range r.Answer {
+		switch rr.Header().Rrtype {
+		case dns.TypeA:
+			if a, ok := rr.(*dns.A); ok {
+				body = []byte(a.A.String())
+			}
+		case dns.TypeAAAA:
+			if aaaa, ok := rr.(*dns.AAAA); ok {
+				body = []byte(aaaa.AAAA.String())
+			}
+		case dns.TypeCNAME:
+			if cname, ok := rr.(*dns.CNAME); ok {
+				body = []byte(cname.Target)
+			}
+		case dns.TypeMX:
+			if mx, ok := rr.(*dns.MX); ok {
+				body = []byte(mx.Mx)
+			}
+		case dns.TypeNS:
+			if ns, ok := rr.(*dns.NS); ok {
+				body = []byte(ns.Ns)
+			}
+		case dns.TypePTR:
+			if ptr, ok := rr.(*dns.PTR); ok {
+				body = []byte(ptr.Ptr)
+			}
+		default:
+			body = []byte("query type is not supported yet")
+		}
+	}
+	return connected, dnsRcode, body, nil
+}
+
 // InjectHTTPClient is used to inject a custom HTTP client for testing purposes
 func InjectHTTPClient(httpClient *http.Client) {
 	injectedHTTPClient = httpClient