1 files changed, 99 insertions, 0 deletions
diff --git a/lib/private/Encryption/File.php b/lib/private/Encryption/File.php
new file mode 100644
index 00000000000..ec55c2cea00
--- /dev/null
+++ b/lib/private/Encryption/File.php
@@ -0,0 +1,99 @@
+<?php
+/**
+ * @author Björn Schießle <schiessle@owncloud.com>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @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\Encryption;
+
+class File implements \OCP\Encryption\IFile {
+
+	/** @var Util */
+	protected $util;
+
+	/**
+	 * cache results of already checked folders
+	 *
+	 * @var array
+	 */
+	protected $cache;
+
+	public function __construct(Util $util) {
+		$this->util = $util;
+	}
+
+
+	/**
+	 * get list of users with access to the file
+	 *
+	 * @param string $path to the file
+	 * @return array  ['users' => $uniqueUserIds, 'public' => $public]
+	 */
+	public function getAccessList($path) {
+
+		// Make sure that a share key is generated for the owner too
+		list($owner, $ownerPath) = $this->util->getUidAndFilename($path);
+
+		// always add owner to the list of users with access to the file
+		$userIds = array($owner);
+
+		if (!$this->util->isFile($owner . '/' . $ownerPath)) {
+			return array('users' => $userIds, 'public' => false);
+		}
+
+		$ownerPath = substr($ownerPath, strlen('/files'));
+		$ownerPath = $this->util->stripPartialFileExtension($ownerPath);
+
+
+		// first get the shares for the parent and cache the result so that we don't
+		// need to check all parents for every file
+		$parent = dirname($ownerPath);
+		if (isset($this->cache[$parent])) {
+			$resultForParents = $this->cache[$parent];
+		} else {
+			$resultForParents = \OCP\Share::getUsersSharingFile($parent, $owner);
+			$this->cache[$parent] = $resultForParents;
+		}
+		$userIds = \array_merge($userIds, $resultForParents['users']);
+		$public = $resultForParents['public'] || $resultForParents['remote'];
+
+
+		// Find out who, if anyone, is sharing the file
+		$resultForFile = \OCP\Share::getUsersSharingFile($ownerPath, $owner, false, false, false);
+		$userIds = \array_merge($userIds, $resultForFile['users']);
+		$public = $resultForFile['public'] || $resultForFile['remote'] || $public;
+
+		// check if it is a group mount
+		if (\OCP\App::isEnabled("files_external")) {
+			$mounts = \OC_Mount_Config::getSystemMountPoints();
+			foreach ($mounts as $mount) {
+				if ($mount['mountpoint'] == substr($ownerPath, 1, strlen($mount['mountpoint']))) {
+					$mountedFor = $this->util->getUserWithAccessToMountPoint($mount['applicable']['users'], $mount['applicable']['groups']);
+					$userIds = array_merge($userIds, $mountedFor);
+				}
+			}
+		}
+
+		// Remove duplicate UIDs
+		$uniqueUserIds = array_unique($userIds);
+
+		return array('users' => $uniqueUserIds, 'public' => $public);
+	}
+
+}