allow apps to disable versions for some files

Signed-off-by: Bjoern Schiessle <bjoern@schiessle.org>

apps/files_versions/lib/Events/CreateVersionEvent.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+namespace OCA\Files_Versions\Events;
+
+
+use OCP\Files\Node;
+use Symfony\Component\EventDispatcher\Event;
+
+
+/**
+ * Class CreateVersionEvent
+ *
+ * Event to allow other apps to disable versions for specific files
+ *
+ * @package OCA\Files_Versions
+ */
+class CreateVersionEvent extends Event {
+
+
+	/** @var bool */
+	private $createVersion;
+
+	/** @var Node */
+	private $node;
+
+	/**
+	 * CreateVersionEvent constructor.
+	 *
+	 * @param Node $node
+	 */
+	public function __construct(Node $node) {
+		$this->createVersion = true;
+		$this->node = $node;
+	}
+
+	/**
+	 * get Node of the file which should be versioned
+	 *
+	 * @return Node
+	 */
+	public function getNode() {
+		return $this->node;
+	}
+
+	/**
+	 * disable versions for this file
+	 */
+	public function disableVersions() {
+		$this->createVersion = false;
+	}
+
+	/**
+	 * should a version be created for this file?
+	 *
+	 * @return bool
+	 */
+	public function shouldCreateVersion() {
+		return $this->createVersion;
+	}
+
+}

apps/files_versions/lib/Storage.php

@@ -47,6 +47,7 @@ use OC\Files\Filesystem;
 use OC\Files\View;
 use OCA\Files_Versions\AppInfo\Application;
 use OCA\Files_Versions\Command\Expire;
+use OCA\Files_Versions\Events\CreateVersionEvent;
 use OCP\Files\NotFoundException;
 use OCP\Lock\ILockingProvider;
 use OCP\User;
@@ -179,6 +180,17 @@ class Storage {
 		$files_view = new View('/'.$uid .'/files');
 		$users_view = new View('/'.$uid);
 
+		$eventDispatcher = \OC::$server->getEventDispatcher();
+		$id = $files_view->getFileInfo($filename)->getId();
+		$nodes = \OC::$server->getRootFolder()->getById($id);
+		foreach ($nodes as $node) {
+			$event = new CreateVersionEvent($node);
+			$eventDispatcher->dispatch('OCA\Files_Versions::createVersion', $event);
+			if ($event->shouldCreateVersion() === false) {
+				return false;
+			}
+		}
+
 		// no use making versions for empty files
 		if ($files_view->filesize($filename) === 0) {
 			return false;