feat: added metadata event listener

Signed-off-by: Eduardo Morales <emoral435@gmail.com>

apps/files_versions/lib/AppInfo/Application.php

@@ -36,6 +36,7 @@ use OCA\Files_Versions\Capabilities;
 use OCA\Files_Versions\Listener\FileEventsListener;
 use OCA\Files_Versions\Listener\LoadAdditionalListener;
 use OCA\Files_Versions\Listener\LoadSidebarListener;
+use OCA\Files_Versions\Listener\MetadataFileEvents;
 use OCA\Files_Versions\Versions\IVersionManager;
 use OCA\Files_Versions\Versions\VersionManager;
 use OCP\Accounts\IAccountManager;
@@ -113,6 +114,7 @@ class Application extends App implements IBootstrap {
 		$context->registerEventListener(NodeTouchedEvent::class, FileEventsListener::class);
 		$context->registerEventListener(BeforeNodeWrittenEvent::class, FileEventsListener::class);
 		$context->registerEventListener(NodeWrittenEvent::class, FileEventsListener::class);
+		$context->registerEventListener(NodeWrittenEvent::class, MetadataFileEvents::class);
 		$context->registerEventListener(BeforeNodeDeletedEvent::class, FileEventsListener::class);
 		$context->registerEventListener(NodeDeletedEvent::class, FileEventsListener::class);
 		$context->registerEventListener(NodeRenamedEvent::class, FileEventsListener::class);

apps/files_versions/lib/Listener/MetadataFileEvents.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @author Eduardo Morales emoral435@gmail.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\Files_Versions\Listener;
+
+use OC\Files\Node\Folder;
+use OCA\Files_Versions\Versions\IMetadataVersionBackend;
+use OCA\Files_Versions\Versions\IVersionManager;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Files\Events\Node\NodeWrittenEvent;
+use OCP\Files\Node;
+use OCP\IUserSession;
+
+/** @template-implements IEventListener<NodeWrittenEvent> */
+class MetadataFileEvents implements IEventListener {
+	public function __construct(
+		private IVersionManager $versionManager,
+		private IUserSession $userSession,
+	) {
+	}
+
+	/**
+	 * @abstract handles events from a nodes version being changed
+	 * @param Event $event the event that triggered this listener to activate
+	 */
+	public function handle(Event $event): void {
+		if ($event instanceof NodeWrittenEvent) {
+			$this->post_write_hook($event->getNode());
+		}
+	}
+
+	/**
+	 * @abstract handles the NodeWrittenEvent, and sets the metadata for the associated node
+	 * @param Node $node the node that is currently being written
+	 */
+	public function post_write_hook(Node $node): void {
+		// Do not handle folders or users that we cannot get metadata from
+		if ($node instanceof Folder || is_null($this->userSession->getUser())) {
+			return;
+		}
+		// check if our version manager supports setting the metadata
+		if ($this->versionManager instanceof IMetadataVersionBackend) {
+			$author = $this->userSession->getUser()->getDisplayName() ?? '';
+			$this->versionManager->setMetadataValue($node, "author", $author);
+		}
+	}
+}