From 8fd2a5d06af7ddd6dfafde749a5b4128a533048d Mon Sep 17 00:00:00 2001
From: Bjoern Kahl <mls@bjoern-kahl.de>
Date: Thu, 18 May 2023 14:28:08 +0000
Subject: [PATCH] Fix out-of-bound array access (IMAP)

The IMAP method allows user names with or without a domain part.  For
user names without a domain part, it still tries to access the (then
non-existing) domain, resulting in "Error: Undefined array key 1 at
.../nextcloud/apps/user_external/lib/IMAP.php#85" log messages.

Signed-off-by: Bjoern Kahl <mls@bjoern-kahl.de>
---
 lib/IMAP.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/IMAP.php b/lib/IMAP.php
index cd5e8ec..328ec23 100644
--- a/lib/IMAP.php
+++ b/lib/IMAP.php
@@ -82,7 +82,7 @@ class IMAP extends Base {
 		}
 
 		$groups = [];
-		if ($this->groupDomain && $pieces[1]) {
+		if ((count($pieces) > 1) && $this->groupDomain && $pieces[1]) {
 			$groups[] = $pieces[1];
 		}