allow apps to control the trash bin

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

apps/files_trashbin/lib/Events/MoveToTrashEvent.php

@@ -0,0 +1,73 @@
+<?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_Trashbin\Events;
+
+
+use OCP\Files\Node;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Class MoveToTrashEvent
+ *
+ * Event to allow other apps to disable the trash bin for specific files
+ *
+ * @package OCA\Files_Trashbin\Events
+ */
+class MoveToTrashEvent extends Event {
+
+	/** @var bool */
+	private $moveToTrashBin;
+
+	/** @var Node */
+	private $node;
+
+	public function __construct(Node $node) {
+		$this->moveToTrashBin = true;
+		$this->node = $node;
+	}
+
+	/**
+	 * get Node which will be deleted
+	 *
+	 * @return Node
+	 */
+	public function getNode() {
+		return $this->node;
+	}
+
+	/**
+	 * disable trash bin for this operation
+	 */
+	public function disableTrashBin() {
+		$this->moveToTrashBin = false;
+	}
+
+	/**
+	 * should the file be moved to the trash bin?
+	 *
+	 * @return bool
+	 */
+	public function shouldMoveToTrashBin() {
+		return $this->moveToTrashBin;
+	}
+}

apps/files_trashbin/lib/Storage.php

@@ -28,9 +28,13 @@ namespace OCA\Files_Trashbin;
 use OC\Files\Filesystem;
 use OC\Files\Storage\Wrapper\Wrapper;
 use OC\Files\View;
+use OCA\Files_Trashbin\Events\MoveToTrashEvent;
 use OCP\Encryption\Exceptions\GenericEncryptionException;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
 use OCP\ILogger;
 use OCP\IUserManager;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class Storage extends Wrapper {
 
@@ -60,18 +64,31 @@ class Storage extends Wrapper {
 	/** @var ILogger */
 	private $logger;
 
+	/** @var EventDispatcher */
+	private $eventDispatcher;
+
+	/** @var IRootFolder */
+	private $rootFolder;
+
 	/**
 	 * Storage constructor.
 	 *
 	 * @param array $parameters
 	 * @param IUserManager|null $userManager
+	 * @param ILogger|null $logger
+	 * @param EventDispatcher|null $eventDispatcher
+	 * @param IRootFolder|null $rootFolder
 	 */
 	public function __construct($parameters,
 								IUserManager $userManager = null,
-								ILogger $logger = null) {
+								ILogger $logger = null,
+								EventDispatcher $eventDispatcher = null,
+								IRootFolder $rootFolder = null) {
 		$this->mountPoint = $parameters['mountPoint'];
 		$this->userManager = $userManager;
 		$this->logger = $logger;
+		$this->eventDispatcher = $eventDispatcher;
+		$this->rootFolder = $rootFolder;
 		parent::__construct($parameters);
 	}
 
@@ -200,6 +217,18 @@ class Storage extends Wrapper {
 	 * @return bool
 	 */
 	protected function shouldMoveToTrash($path){
+
+		// check if there is a app which want to disable the trash bin for this file
+		$fileId = $this->storage->getCache()->getId($path);
+		$nodes = $this->rootFolder->getById($fileId);
+		foreach ($nodes as $node) {
+			$event = $this->createMoveToTrashEvent($node);
+			$this->eventDispatcher->dispatch('OCA\Files_Trashbin::moveToTrash', $event);
+			if ($event->shouldMoveToTrashBin() === false) {
+				return false;
+			}
+		}
+
 		$normalized = Filesystem::normalizePath($this->mountPoint . '/' . $path);
 		$parts = explode('/', $normalized);
 		if (count($parts) < 4) {
@@ -213,6 +242,17 @@ class Storage extends Wrapper {
 		return false;
 	}
 
+	/**
+	 * get move to trash event
+	 *
+	 * @param Node $node
+	 * @return MoveToTrashEvent
+	 */
+	protected function createMoveToTrashEvent(Node $node) {
+		$event = new MoveToTrashEvent($node);
+		return $event;
+	}
+
 	/**
 	 * Run the delete operation with the given method
 	 *
@@ -269,7 +309,9 @@ class Storage extends Wrapper {
 			return new \OCA\Files_Trashbin\Storage(
 				array('storage' => $storage, 'mountPoint' => $mountPoint),
 				\OC::$server->getUserManager(),
-				\OC::$server->getLogger()
+				\OC::$server->getLogger(),
+				\OC::$server->getEventDispatcher(),
+				\OC::$server->getLazyRootFolder()
 			);
 		}, 1);
 	}

apps/files_trashbin/tests/StorageTest.php

@@ -31,7 +31,13 @@ namespace OCA\Files_Trashbin\Tests;
 
 use OC\Files\Storage\Temporary;
 use OC\Files\Filesystem;
+use OCA\Files_Trashbin\Events\MoveToTrashEvent;
+use OCA\Files_Trashbin\Storage;
+use OCP\Files\Cache\ICache;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
 use OCP\ILogger;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 
 /**
  * Class Storage
@@ -522,19 +528,40 @@ class StorageTest extends \Test\TestCase {
 	/**
 	 * @dataProvider dataTestShouldMoveToTrash
 	 */
-	public function testShouldMoveToTrash($mountPoint, $path, $userExists, $expected) {
+	public function testShouldMoveToTrash($mountPoint, $path, $userExists, $appDisablesTrash, $expected) {
+		$fileID = 1;
+		$cache = $this->getMock(ICache::class);
+		$cache->expects($this->any())->method('getId')->willReturn($fileID);
 		$tmpStorage = $this->getMockBuilder('\OC\Files\Storage\Temporary')
-			->disableOriginalConstructor()->getMock();
+			->disableOriginalConstructor()->getMock($cache);
+		$tmpStorage->expects($this->any())->method('getCache')->willReturn($cache);
 		$userManager = $this->getMockBuilder('OCP\IUserManager')
 			->disableOriginalConstructor()->getMock();
 		$userManager->expects($this->any())
 			->method('userExists')->willReturn($userExists);
 		$logger = $this->getMockBuilder(ILogger::class)->getMock();
-		$storage = new \OCA\Files_Trashbin\Storage(
+		$eventDispatcher = $this->getMockBuilder(EventDispatcher::class)
+			->disableOriginalConstructor()->getMock();
+		$rootFolder = $this->getMock(IRootFolder::class);
+		$node = $this->getMockBuilder(Node::class)->disableOriginalConstructor()->getMock();
+		$event = $this->getMockBuilder(MoveToTrashEvent::class)->disableOriginalConstructor()->getMock();
+		$event->expects($this->any())->method('shouldMoveToTrashBin')->willReturn(!$appDisablesTrash);
+
+		$rootFolder->expects($this->any())->method('getById')->with($fileID)->willReturn([$node]);
+
+		$storage = $this->getMockBuilder(Storage::class)
+			->setConstructorArgs(
+				[
 					['mountPoint' => $mountPoint, 'storage' => $tmpStorage],
 					$userManager,
-			$logger
-		);
+					$logger,
+					$eventDispatcher,
+					$rootFolder
+				]
+			)->setMethods(['createMoveToTrashEvent'])->getMock();
+
+		$storage->expects($this->any())->method('createMoveToTrashEvent')->with($node)
+			->willReturn($event);
 
 		$this->assertSame($expected,
 			$this->invokePrivate($storage, 'shouldMoveToTrash', [$path])
@@ -544,10 +571,13 @@ class StorageTest extends \Test\TestCase {
 
 	public function dataTestShouldMoveToTrash() {
 		return [
-			['/schiesbn/', '/files/test.txt', true, true],
-			['/schiesbn/', '/files/test.txt', false, false],
-			['/schiesbn/', '/test.txt', true, false],
-			['/schiesbn/', '/test.txt', false, false],
+			['/schiesbn/', '/files/test.txt', true, false, true],
+			['/schiesbn/', '/files/test.txt', false, false, false],
+			['/schiesbn/', '/test.txt', true, false, false],
+			['/schiesbn/', '/test.txt', false, false, false],
+			// other apps disables the trashbin
+			['/schiesbn/', '/files/test.txt', true, true, false],
+			['/schiesbn/', '/files/test.txt', false, true, false],
 		];
 	}