Initial Codebase (untested)
This commit is contained in:
James Mills
270
internal/api.go
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270
internal/api.go
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package internal
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"time"
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jwt "github.com/dgrijalva/jwt-go"
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"github.com/julienschmidt/httprouter"
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log "github.com/sirupsen/logrus"
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"git.mills.io/prologic/spyda/internal/passwords"
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"git.mills.io/prologic/spyda/types"
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)
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// ContextKey ...
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type ContextKey int
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const (
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TokenContextKey ContextKey = iota
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UserContextKey
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)
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var (
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// ErrInvalidCredentials is returned for invalid credentials against /auth
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ErrInvalidCredentials = errors.New("error: invalid credentials")
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// ErrInvalidToken is returned for expired or invalid tokens used in Authorizeation headers
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ErrInvalidToken = errors.New("error: invalid token")
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)
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// API ...
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type API struct {
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router *Router
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config *Config
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cache *Cache
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archive Archiver
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db Store
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pm passwords.Passwords
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tasks *Dispatcher
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}
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// NewAPI ...
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func NewAPI(router *Router, config *Config, cache *Cache, archive Archiver, db Store, pm passwords.Passwords, tasks *Dispatcher) *API {
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api := &API{router, config, cache, archive, db, pm, tasks}
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api.initRoutes()
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return api
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}
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func (a *API) initRoutes() {
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router := a.router.Group("/api/v1")
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router.GET("/ping", a.PingEndpoint())
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router.POST("/auth", a.AuthEndpoint())
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// Support / Report endpoints
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router.POST("/support", a.isAuthorized(a.SupportEndpoint()))
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router.POST("/report", a.isAuthorized(a.ReportEndpoint()))
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}
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// CreateToken ...
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func (a *API) CreateToken(user *User, r *http.Request) (*Token, error) {
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claims := jwt.MapClaims{}
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claims["username"] = user.Username
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createdAt := time.Now()
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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tokenString, err := token.SignedString([]byte(a.config.APISigningKey))
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if err != nil {
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log.WithError(err).Error("error creating signed token")
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return nil, err
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}
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signedToken, err := jwt.Parse(tokenString, a.jwtKeyFunc)
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if err != nil {
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log.WithError(err).Error("error creating signed token")
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return nil, err
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}
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tkn := &Token{
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Signature: signedToken.Signature,
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Value: tokenString,
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UserAgent: r.UserAgent(),
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CreatedAt: createdAt,
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}
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return tkn, nil
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}
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func (a *API) jwtKeyFunc(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("There was an error")
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}
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return []byte(a.config.APISigningKey), nil
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}
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func (a *API) getLoggedInUser(r *http.Request) *User {
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token, err := jwt.Parse(r.Header.Get("Token"), a.jwtKeyFunc)
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if err != nil {
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return nil
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}
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if !token.Valid {
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return nil
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}
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claims := token.Claims.(jwt.MapClaims)
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username := claims["username"].(string)
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user, err := a.db.GetUser(username)
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if err != nil {
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log.WithError(err).Error("error loading user object")
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return nil
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}
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// Every registered new user follows themselves
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// TODO: Make this configurable server behaviour?
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if user.Following == nil {
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user.Following = make(map[string]string)
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}
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user.Following[user.Username] = user.URL
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return user
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}
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func (a *API) isAuthorized(endpoint httprouter.Handle) httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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if r.Header.Get("Token") == "" {
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http.Error(w, "No Token Provided", http.StatusUnauthorized)
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return
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}
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token, err := jwt.Parse(r.Header.Get("Token"), a.jwtKeyFunc)
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if err != nil {
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log.WithError(err).Error("error parsing token")
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http.Error(w, "Bad Request", http.StatusBadRequest)
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return
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}
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if token.Valid {
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claims := token.Claims.(jwt.MapClaims)
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username := claims["username"].(string)
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user, err := a.db.GetUser(username)
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if err != nil {
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log.WithError(err).Error("error loading user object")
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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// Every registered new user follows themselves
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// TODO: Make this configurable server behaviour?
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if user.Following == nil {
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user.Following = make(map[string]string)
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}
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user.Following[user.Username] = user.URL
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ctx := context.WithValue(r.Context(), TokenContextKey, token)
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ctx = context.WithValue(ctx, UserContextKey, user)
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endpoint(w, r.WithContext(ctx), p)
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} else {
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http.Error(w, "Invalid Token", http.StatusUnauthorized)
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return
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}
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}
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}
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// PingEndpoint ...
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func (a *API) PingEndpoint() httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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w.Header().Set("Content-Type", "application/json")
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_, _ = w.Write([]byte(`{}`))
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}
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}
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// AuthEndpoint ...
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func (a *API) AuthEndpoint() httprouter.Handle {
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// #239: Throttle failed login attempts and lock user account.
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failures := NewTTLCache(5 * time.Minute)
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return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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req, err := types.NewAuthRequest(r.Body)
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if err != nil {
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log.WithError(err).Error("error parsing auth request")
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http.Error(w, "Bad Request", http.StatusBadRequest)
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return
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}
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username := NormalizeUsername(req.Username)
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password := req.Password
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// Error: no username or password provided
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if username == "" || password == "" {
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log.Warn("no username or password provided")
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http.Error(w, "Bad Request", http.StatusBadRequest)
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return
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}
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// Lookup user
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user, err := a.db.GetUser(username)
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if err != nil {
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log.WithField("username", username).Warn("login attempt from non-existent user")
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http.Error(w, "Invalid Credentials", http.StatusUnauthorized)
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return
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}
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// #239: Throttle failed login attempts and lock user account.
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if failures.Get(user.Username) > MaxFailedLogins {
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http.Error(w, "Account Locked", http.StatusTooManyRequests)
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return
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}
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// Validate cleartext password against KDF hash
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err = a.pm.CheckPassword(user.Password, password)
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if err != nil {
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// #239: Throttle failed login attempts and lock user account.
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failed := failures.Inc(user.Username)
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time.Sleep(time.Duration(IntPow(2, failed)) * time.Second)
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log.WithField("username", username).Warn("login attempt with invalid credentials")
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http.Error(w, "Invalid Credentials", http.StatusUnauthorized)
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return
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}
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// #239: Throttle failed login attempts and lock user account.
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failures.Reset(user.Username)
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// Login successful
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log.WithField("username", username).Info("login successful")
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token, err := a.CreateToken(user, r)
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if err != nil {
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log.WithError(err).Error("error creating token")
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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user.AddToken(token)
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if err := a.db.SetToken(token.Signature, token); err != nil {
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log.WithError(err).Error("error saving token object")
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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if err := a.db.SetUser(user.Username, user); err != nil {
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log.WithError(err).Error("error saving user object")
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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res := types.AuthResponse{Token: token.Value}
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body, err := res.Bytes()
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if err != nil {
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log.WithError(err).Error("error serializing response")
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, _ = w.Write(body)
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}
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}
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