fix(core): allow guest avatar fallback

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

core/Controller/AvatarController.php

@@ -37,12 +37,14 @@ use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataDisplayResponse;
 use OCP\AppFramework\Http\FileDisplayResponse;
 use OCP\AppFramework\Http\JSONResponse;
+use OCP\AppFramework\Http\RedirectResponse;
 use OCP\Files\File;
 use OCP\Files\IRootFolder;
 use OCP\IAvatarManager;
 use OCP\ICache;
 use OCP\IL10N;
 use OCP\IRequest;
+use OCP\IURLGenerator;
 use OCP\IUserManager;
 use Psr\Log\LoggerInterface;
 
@@ -63,6 +65,8 @@ class AvatarController extends Controller {
 		protected LoggerInterface $logger,
 		protected ?string $userId,
 		protected TimeFactory $timeFactory,
+		protected IURLGenerator $urlGenerator,
+		protected GuestAvatarController $guestAvatarController,
 	) {
 		parent::__construct($appName, $request);
 	}
@@ -104,6 +108,9 @@ class AvatarController extends Controller {
 				['Content-Type' => $avatarFile->getMimeType(), 'X-NC-IsCustomAvatar' => (int)$avatar->isCustomAvatar()]
 			);
 		} catch (\Exception $e) {
+			if ($guestFallback) {
+				return $this->guestAvatarController->getAvatarDark($userId, (string)$size);
+			}
 			return new JSONResponse([], Http::STATUS_NOT_FOUND);
 		}
 
@@ -150,6 +157,9 @@ class AvatarController extends Controller {
 				['Content-Type' => $avatarFile->getMimeType(), 'X-NC-IsCustomAvatar' => (int)$avatar->isCustomAvatar()]
 			);
 		} catch (\Exception $e) {
+			if ($guestFallback) {
+				return $this->guestAvatarController->getAvatar($userId, (string)$size);
+			}
 			return new JSONResponse([], Http::STATUS_NOT_FOUND);
 		}