[15] Add interface to allow storages from opting out of encryption

apps/files_external/lib/Lib/Storage/OwnCloud.php

@@ -25,6 +25,7 @@
  */
 
 namespace OCA\Files_External\Lib\Storage;
+use OCP\Files\Storage\IDisableEncryptionStorage;
 use Sabre\DAV\Client;
 
 /**
@@ -34,7 +35,7 @@
  * http://%host/%context/remote.php/webdav/%root
  *
  */
-class OwnCloud extends \OC\Files\Storage\DAV{
+class OwnCloud extends \OC\Files\Storage\DAV implements IDisableEncryptionStorage {
 	const OC_URL_SUFFIX = 'remote.php/webdav';
 
 	public function __construct($params) {

apps/files_sharing/lib/External/Storage.php

@@ -39,10 +39,11 @@
 use OCP\Constants;
 use OCP\Federation\ICloudId;
 use OCP\Files\NotFoundException;
+use OCP\Files\Storage\IDisableEncryptionStorage;
 use OCP\Files\StorageInvalidException;
 use OCP\Files\StorageNotAvailableException;
 
-class Storage extends DAV implements ISharedStorage {
+class Storage extends DAV implements ISharedStorage, IDisableEncryptionStorage {
 	/** @var ICloudId */
 	private $cloudId;
 	/** @var string */

apps/files_sharing/lib/SharedStorage.php

@@ -39,14 +39,15 @@
 use OCP\Constants;
 use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\NotFoundException;
+use OCP\Files\Storage\IDisableEncryptionStorage;
 use OCP\Files\Storage\IStorage;
 use OCP\Lock\ILockingProvider;
 use OC\User\NoUserException;
 
 /**
  * Convert target path to source path and pass the function call to the correct storage provider
  */
-class SharedStorage extends \OC\Files\Storage\Wrapper\Jail implements ISharedStorage {
+class SharedStorage extends \OC\Files\Storage\Wrapper\Jail implements ISharedStorage, IDisableEncryptionStorage {
 
 	/** @var \OCP\Share\IShare */
 	private $superShare;

lib/private/Encryption/EncryptionWrapper.php

@@ -82,9 +82,7 @@ public function wrapStorage($mountPoint, Storage $storage, IMountPoint $mount) {
 			'mount' => $mount
 		];
 
-		if (!$storage->instanceOfStorage('OCA\Files_Sharing\SharedStorage')
-			&& !$storage->instanceOfStorage('OCA\Files_Sharing\External\Storage')
-			&& !$storage->instanceOfStorage('OC\Files\Storage\OwnCloud')) {
+		if (!$storage->instanceOfStorage(Storage\IDisableEncryptionStorage::class)) {
 
 			$user = \OC::$server->getUserSession()->getUser();
 			$mountManager = Filesystem::getMountManager();

lib/public/Files/Storage/IDisableEncryptionStorage.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
+ *
+ * @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 OCP\Files\Storage;
+
+/**
+ * Marks that a storage does not support server side encryption
+ *
+ * @since 15.0.0
+ */
+interface IDisableEncryptionStorage {
+
+}