Delete the chat messages of a room when the room is deleted

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

lib/AppInfo/Application.php

@@ -22,6 +22,7 @@
 namespace OCA\Spreed\AppInfo;
 
 use OCA\Spreed\Activity\Hooks;
+use OCA\Spreed\Chat\ChatManager;
 use OCA\Spreed\HookListener;
 use OCA\Spreed\Notification\Notifier;
 use OCA\Spreed\Room;
@@ -51,6 +52,7 @@ class Application extends App {
 		$dispatcher = $server->getEventDispatcher();
 		$this->registerSignalingHooks($dispatcher);
 		$this->registerActivityHooks($dispatcher);
+		$this->registerChatHooks($dispatcher);
 	}
 
 	protected function registerNotifier(IServerContainer $server) {
@@ -110,4 +112,16 @@ class Application extends App {
 		$dispatcher->addListener(Room::class . '::postRemoveUser', $listener);
 		$dispatcher->addListener(Room::class . '::postUserDisconnectRoom', $listener);
 	}
+
+	protected function registerChatHooks(EventDispatcherInterface $dispatcher) {
+		$listener = function(GenericEvent $event, $eventName) {
+			/** @var Room $room */
+			$room = $event->getSubject();
+
+			/** @var ChatManager $chatManager */
+			$chatManager = $this->getContainer()->query(ChatManager::class);
+			$chatManager->deleteMessages((string) $room->getId());
+		};
+		$dispatcher->addListener(Room::class . '::postDeleteRoom', $listener);
+	}
 }

lib/Chat/ChatManager.php

@@ -120,4 +120,13 @@ class ChatManager {
 		return $comments;
 	}
 
+	/**
+	 * Deletes all the messages for the given chat.
+	 *
+	 * @param string $chatId
+	 */
+	public function deleteMessages($chatId) {
+		$this->commentsManager->deleteCommentsAtObject('chat', $chatId);
+	}
+
 }

tests/php/Chat/ChatManagerTest.php

@@ -185,4 +185,12 @@ class ChatManagerTest extends \Test\TestCase {
 		$this->assertEquals($expected, $comments);
 	}
 
+	public function testDeleteMessages() {
+		$this->commentsManager->expects($this->once())
+			->method('deleteCommentsAtObject')
+			->with('chat', 'testChatId');
+
+		$this->chatManager->deleteMessages('testChatId');
+	}
+
 }