1 files changed, 131 insertions, 0 deletions
diff --git a/lib/private/Files/Storage/Wrapper/PermissionsMask.php b/lib/private/Files/Storage/Wrapper/PermissionsMask.php
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+++ b/lib/private/Files/Storage/Wrapper/PermissionsMask.php
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+<?php
+/**
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <icewind@owncloud.com>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @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 OC\Files\Storage\Wrapper;
+
+use OC\Files\Cache\Wrapper\CachePermissionsMask;
+use OCP\Constants;
+
+/**
+ * Mask the permissions of a storage
+ *
+ * This can be used to restrict update, create, delete and/or share permissions of a storage
+ *
+ * Note that the read permissions can't be masked
+ */
+class PermissionsMask extends Wrapper {
+	/**
+	 * @var int the permissions bits we want to keep
+	 */
+	private $mask;
+
+	/**
+	 * @param array $arguments ['storage' => $storage, 'mask' => $mask]
+	 *
+	 * $storage: The storage the permissions mask should be applied on
+	 * $mask: The permission bits that should be kept, a combination of the \OCP\Constant::PERMISSION_ constants
+	 */
+	public function __construct($arguments) {
+		parent::__construct($arguments);
+		$this->mask = $arguments['mask'];
+	}
+
+	private function checkMask($permissions) {
+		return ($this->mask & $permissions) === $permissions;
+	}
+
+	public function isUpdatable($path) {
+		return $this->checkMask(Constants::PERMISSION_UPDATE) and parent::isUpdatable($path);
+	}
+
+	public function isCreatable($path) {
+		return $this->checkMask(Constants::PERMISSION_CREATE) and parent::isCreatable($path);
+	}
+
+	public function isDeletable($path) {
+		return $this->checkMask(Constants::PERMISSION_DELETE) and parent::isDeletable($path);
+	}
+
+	public function isSharable($path) {
+		return $this->checkMask(Constants::PERMISSION_SHARE) and parent::isSharable($path);
+	}
+
+	public function getPermissions($path) {
+		return $this->storage->getPermissions($path) & $this->mask;
+	}
+
+	public function rename($path1, $path2) {
+		return $this->checkMask(Constants::PERMISSION_UPDATE) and parent::rename($path1, $path2);
+	}
+
+	public function copy($path1, $path2) {
+		return $this->checkMask(Constants::PERMISSION_CREATE) and parent::copy($path1, $path2);
+	}
+
+	public function touch($path, $mtime = null) {
+		$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
+		return $this->checkMask($permissions) and parent::touch($path, $mtime);
+	}
+
+	public function mkdir($path) {
+		return $this->checkMask(Constants::PERMISSION_CREATE) and parent::mkdir($path);
+	}
+
+	public function rmdir($path) {
+		return $this->checkMask(Constants::PERMISSION_DELETE) and parent::rmdir($path);
+	}
+
+	public function unlink($path) {
+		return $this->checkMask(Constants::PERMISSION_DELETE) and parent::unlink($path);
+	}
+
+	public function file_put_contents($path, $data) {
+		$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
+		return $this->checkMask($permissions) and parent::file_put_contents($path, $data);
+	}
+
+	public function fopen($path, $mode) {
+		if ($mode === 'r' or $mode === 'rb') {
+			return parent::fopen($path, $mode);
+		} else {
+			$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
+			return $this->checkMask($permissions) ? parent::fopen($path, $mode) : false;
+		}
+	}
+
+	/**
+	 * get a cache instance for the storage
+	 *
+	 * @param string $path
+	 * @param \OC\Files\Storage\Storage (optional) the storage to pass to the cache
+	 * @return \OC\Files\Cache\Cache
+	 */
+	public function getCache($path = '', $storage = null) {
+		if (!$storage) {
+			$storage = $this;
+		}
+		$sourceCache = parent::getCache($path, $storage);
+		return new CachePermissionsMask($sourceCache, $this->mask);
+	}
+}