fix(avatar): Fix loading avatars for users with email address user ids

build/integration/features/avatar.feature

@@ -97,3 +97,21 @@ Feature: avatar
       | Content-Type | image/png |
     And last avatar is a square of size 512
     And last avatar is not a single color
+
+  Scenario: Get avatar for users with cloudID formatted user id
+    Given user "user@example.tld" exists
+    Given Logging in using web as "user@example.tld"
+    When logged in user posts avatar from file "data/green-square-256.png"
+    And user "user@example.tld" gets avatar for user "user@example.tld"
+    And The following headers should be set
+      | Content-Type | image/png |
+      | X-NC-IsCustomAvatar | 1 |
+    # Last avatar size is 512 by default when getting avatar without size parameter
+    And last avatar is a square of size 512
+    And last avatar is a single "#00FF00" color
+    And user "anonymous" gets avatar for user "user@example.tld"
+    And The following headers should be set
+      | Content-Type | image/png |
+      | X-NC-IsCustomAvatar | 1 |
+    And last avatar is a square of size 512
+    And last avatar is a single "#00FF00" color

lib/private/Avatar/AvatarManager.php

@@ -49,18 +49,18 @@ public function __construct(
 	 * If the user is disabled a guest avatar will be returned
 	 *
 	 * @see \OCP\IAvatar
-	 * @param string $userId the ownCloud user id
+	 * @param string $userId the user id
 	 * @throws \Exception In case the username is potentially dangerous
 	 * @throws NotFoundException In case there is no user folder yet
 	 */
 	#[\Override]
 	public function getAvatar(string $userId): IAvatar {
-		if ($this->cloudIdManager->isValidCloudId($userId)) {
-			return $this->getRemoteAvatar($userId);
-		}
-
 		$user = $this->userManager->get($userId);
 		if ($user === null) {
+			if ($this->cloudIdManager->isValidCloudId($userId)) {
+				return $this->getRemoteAvatar($userId);
+			}
+
 			throw new \Exception('user does not exist');
 		}
 

tests/lib/Avatar/AvatarManagerTest.php

@@ -287,8 +287,9 @@ public function testGetAvatarForRemoteUser(): void {
 		$cloudId = 'user@https://remote.example.com';
 
 		$this->userManager
-			->expects($this->never())
-			->method('get');
+			->expects($this->once())
+			->method('get')
+			->willReturn(null);
 
 		$resolvedCloudId = $this->createMock(ICloudId::class);
 		$resolvedCloudId->method('getUser')->willReturn('user');