fix(flow_notifications): Improve app loading by checking if notifications app is not installed and enabled when registering the app

Signed-off-by: Faisal Alghamdi <[email protected]>

Author: falghamdi125

lib/Listener/RegisterOperationsListener.php

@@ -31,21 +31,29 @@
 use OCP\EventDispatcher\IEventListener;
 use OCP\Util;
 use OCP\WorkflowEngine\Events\RegisterOperationsEvent;
+use OCP\App\IAppManager;
+use Psr\Log\LoggerInterface;
 
 /**
  * @template-implements IEventListener<Event|RegisterOperationsEvent>
  */
 class RegisterOperationsListener implements IEventListener {
 	public function __construct(
 		protected readonly Operation $operation,
+		protected IAppManager $appManager
 	) {
 	}
 
 	public function handle(Event $event): void {
 		if (!$event instanceof RegisterOperationsEvent) {
 			return;
+		} else if(!$this->appManager->isInstalled('notifications') || 
+		!$this->appManager->isEnabledForUser('notifications')) {
+			$logger = \OC::$server->get(LoggerInterface::class);
+			$logger->error('Failed to register `flow_notifications` app. This could happen due to the app `notifications` isn\'t installed or enabled.', [ 'app'=> 'flow_notifications']);
+			return;
 		}
-
+		
 		$event->registerOperation($this->operation);
 		Util::addScript(Application::APP_ID, 'flow_notifications-main');
 	}