[stable26] fix(ldap): avatar is not being fetched

apps/user_ldap/lib/User/User.php

@@ -525,9 +525,9 @@ public function updateAvatarPostLogin($params) {
 
 	/**
 	 * @brief attempts to get an image from LDAP and sets it as Nextcloud avatar
-	 * @return bool
+	 * @return bool true when the avatar was set successfully or is up to date
 	 */
-	public function updateAvatar($force = false) {
+	public function updateAvatar(bool $force = false): bool {
 		if (!$force && $this->wasRefreshed('avatar')) {
 			return false;
 		}
@@ -544,7 +544,7 @@ public function updateAvatar($force = false) {
 		// use the checksum before modifications
 		$checksum = md5($this->image->data());
 
-		if ($checksum === $this->config->getUserValue($this->uid, 'user_ldap', 'lastAvatarChecksum', '')) {
+		if ($checksum === $this->config->getUserValue($this->uid, 'user_ldap', 'lastAvatarChecksum', '') && $this->avatarExists()) {
 			return true;
 		}
 
@@ -558,6 +558,15 @@ public function updateAvatar($force = false) {
 		return $isSet;
 	}
 
+	private function avatarExists(): bool {
+		try {
+			$currentAvatar = $this->avatarManager->getAvatar($this->uid);
+			return $currentAvatar->exists() && $currentAvatar->isCustomAvatar();
+		} catch (\Exception $e) {
+			return false;
+		}
+	}
+
 	/**
 	 * @brief sets an image as Nextcloud avatar
 	 * @return bool

apps/user_ldap/tests/User/UserTest.php

@@ -585,9 +585,17 @@ public function testUpdateAvatarKnownJpegPhotoProvided() {
 		$avatar = $this->createMock(IAvatar::class);
 		$avatar->expects($this->never())
 			->method('set');
+		$avatar->expects($this->any())
+			->method('exists')
+			->willReturn(true);
+		$avatar->expects($this->any())
+			->method('isCustomAvatar')
+			->willReturn(true);
 
-		$this->avatarManager->expects($this->never())
-			->method('getAvatar');
+		$this->avatarManager->expects($this->any())
+			->method('getAvatar')
+			->with($this->uid)
+			->willReturn($avatar);
 
 		$this->connection->expects($this->any())
 			->method('resolveRule')