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<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2013 Michael Gapczynski mtgap@owncloud.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Files\Cache;
class Shared_Updater {
// shares which can be removed from oc_share after the delete operation was successful
static private $toRemove = array();
/**
* walk up the users file tree and update the etags
* @param string $user
* @param string $path
*/
static private function correctUsersFolder($user, $path) {
// $path points to the mount point which is a virtual folder, so we start with
// the parent
$path = '/files' . dirname($path);
\OC\Files\Filesystem::initMountPoints($user);
$view = new \OC\Files\View('/' . $user);
if ($view->file_exists($path)) {
while ($path !== dirname($path)) {
$etag = $view->getETag($path);
$view->putFileInfo($path, array('etag' => $etag));
$path = dirname($path);
}
} else {
\OCP\Util::writeLog('files_sharing', 'can not update etags on ' . $path . ' for user ' . $user . '. Path does not exists', \OCP\Util::DEBUG);
}
}
/**
* Correct the parent folders' ETags for all users shared the file at $target
*
* @param string $target
*/
static public function correctFolders($target) {
// ignore part files
if (pathinfo($target, PATHINFO_EXTENSION) === 'part') {
return false;
}
// Correct Shared folders of other users shared with
$shares = \OCA\Files_Sharing\Helper::getSharesFromItem($target);
foreach ($shares as $share) {
if ((int)$share['share_type'] === \OCP\Share::SHARE_TYPE_USER) {
self::correctUsersFolder($share['share_with'], $share['file_target']);
} elseif ((int)$share['share_type'] === \OCP\Share::SHARE_TYPE_GROUP) {
$users = \OC_Group::usersInGroup($share['share_with']);
foreach ($users as $user) {
self::correctUsersFolder($user, $share['file_target']);
}
} else { //unique name for group share
self::correctUsersFolder($share['share_with'], $share['file_target']);
}
}
}
/**
* remove all shares for a given file if the file was deleted
*
* @param string $path
*/
private static function removeShare($path) {
$fileSource = self::$toRemove[$path];
if (!\OC\Files\Filesystem::file_exists($path)) {
$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share` WHERE `file_source`=?');
try {
\OC_DB::executeAudited($query, array($fileSource));
} catch (\Exception $e) {
\OCP\Util::writeLog('files_sharing', "can't remove share: " . $e->getMessage(), \OCP\Util::WARN);
}
}
unset(self::$toRemove[$path]);
}
/**
* @param array $params
*/
static public function writeHook($params) {
self::correctFolders($params['path']);
}
/**
* @param array $params
*/
static public function renameHook($params) {
self::correctFolders($params['newpath']);
self::correctFolders(pathinfo($params['oldpath'], PATHINFO_DIRNAME));
}
/**
* @param array $params
*/
static public function deleteHook($params) {
$path = $params['path'];
self::correctFolders($path);
$fileInfo = \OC\Files\Filesystem::getFileInfo($path);
// mark file as deleted so that we can clean up the share table if
// the file was deleted successfully
self::$toRemove[$path] = $fileInfo['fileid'];
}
/**
* @param array $params
*/
static public function postDeleteHook($params) {
self::removeShare($params['path']);
}
/**
* clean up oc_share table from files which are no longer exists
*
* This fixes issues from updates from files_sharing < 0.3.5.6 (ownCloud 4.5)
* It will just be called during the update of the app
*/
static public function fixBrokenSharesOnAppUpdate() {
// delete all shares where the original file no longer exists
$findAndRemoveShares = \OC_DB::prepare('DELETE FROM `*PREFIX*share` ' .
'WHERE `file_source` NOT IN ( ' .
'SELECT `fileid` FROM `*PREFIX*filecache` WHERE `item_type` IN (\'file\', \'folder\'))'
);
$findAndRemoveShares->execute(array());
}
}
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