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<?php
/**
* @author Bart Visscher <bartv@thisnet.nl>
* @author Felix Moeller <mail@felixmoeller.de>
* @author Jakob Sack <mail@jakobsack.de>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2015, 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/>
*
*/
class OC_Connector_Sabre_Locks extends \Sabre\DAV\Locks\Backend\AbstractBackend {
/**
* Returns a list of \Sabre\DAV\Locks_LockInfo objects
*
* This method should return all the locks for a particular uri, including
* locks that might be set on a parent uri.
*
* If returnChildLocks is set to true, this method should also look for
* any locks in the subtree of the uri for locks.
*
* @param string $uri
* @param bool $returnChildLocks
* @return array
*/
public function getLocks($uri, $returnChildLocks) {
// NOTE: the following 10 lines or so could be easily replaced by
// pure sql. MySQL's non-standard string concatination prevents us
// from doing this though.
// NOTE: SQLite requires time() to be inserted directly. That's ugly
// but otherwise reading locks from SQLite Databases will return
// nothing
$query = 'SELECT * FROM `*PREFIX*locks`'
.' WHERE `userid` = ? AND (`created` + `timeout`) > '.time().' AND (( `uri` = ?)';
if (OC_Config::getValue( "dbtype") === 'oci') {
//FIXME oracle hack: need to explicitly cast CLOB to CHAR for comparison
$query = 'SELECT * FROM `*PREFIX*locks`'
.' WHERE `userid` = ? AND (`created` + `timeout`) > '.time().' AND (( to_char(`uri`) = ?)';
}
$params = array(OC_User::getUser(), $uri);
// We need to check locks for every part in the uri.
$uriParts = explode('/', $uri);
// We already covered the last part of the uri
array_pop($uriParts);
$currentPath='';
foreach($uriParts as $part) {
if ($currentPath) $currentPath.='/';
$currentPath.=$part;
//FIXME oracle hack: need to explicitly cast CLOB to CHAR for comparison
if (OC_Config::getValue( "dbtype") === 'oci') {
$query.=' OR (`depth` != 0 AND to_char(`uri`) = ?)';
} else {
$query.=' OR (`depth` != 0 AND `uri` = ?)';
}
$params[] = $currentPath;
}
if ($returnChildLocks) {
//FIXME oracle hack: need to explicitly cast CLOB to CHAR for comparison
if (OC_Config::getValue( "dbtype") === 'oci') {
$query.=' OR (to_char(`uri`) LIKE ?)';
} else {
$query.=' OR (`uri` LIKE ?)';
}
$params[] = $uri . '/%';
}
$query.=')';
$result = OC_DB::executeAudited( $query, $params );
$lockList = array();
while( $row = $result->fetchRow()) {
$lockInfo = new \Sabre\DAV\Locks\LockInfo();
$lockInfo->owner = $row['owner'];
$lockInfo->token = $row['token'];
$lockInfo->timeout = $row['timeout'];
$lockInfo->created = $row['created'];
$lockInfo->scope = $row['scope'];
$lockInfo->depth = $row['depth'];
$lockInfo->uri = $row['uri'];
$lockList[] = $lockInfo;
}
return $lockList;
}
/**
* Locks a uri
*
* @param string $uri
* @param \Sabre\DAV\Locks\LockInfo $lockInfo
* @return bool
*/
public function lock($uri, \Sabre\DAV\Locks\LockInfo $lockInfo) {
// We're making the lock timeout 5 minutes
$lockInfo->timeout = 300;
$lockInfo->created = time();
$lockInfo->uri = $uri;
$locks = $this->getLocks($uri, false);
$exists = false;
foreach($locks as $lock) {
if ($lock->token == $lockInfo->token) {
$exists = true;
break;
}
}
if ($exists) {
$sql = 'UPDATE `*PREFIX*locks`'
.' SET `owner` = ?, `timeout` = ?, `scope` = ?, `depth` = ?, `uri` = ?, `created` = ?'
.' WHERE `userid` = ? AND `token` = ?';
$result = OC_DB::executeAudited( $sql, array(
$lockInfo->owner,
$lockInfo->timeout,
$lockInfo->scope,
$lockInfo->depth,
$uri,
$lockInfo->created,
OC_User::getUser(),
$lockInfo->token)
);
} else {
$sql = 'INSERT INTO `*PREFIX*locks`'
.' (`userid`,`owner`,`timeout`,`scope`,`depth`,`uri`,`created`,`token`)'
.' VALUES (?,?,?,?,?,?,?,?)';
$result = OC_DB::executeAudited( $sql, array(
OC_User::getUser(),
$lockInfo->owner,
$lockInfo->timeout,
$lockInfo->scope,
$lockInfo->depth,
$uri,
$lockInfo->created,
$lockInfo->token)
);
}
return true;
}
/**
* Removes a lock from a uri
*
* @param string $uri
* @param \Sabre\DAV\Locks\LockInfo $lockInfo
* @return bool
*/
public function unlock($uri, \Sabre\DAV\Locks\LockInfo $lockInfo) {
$sql = 'DELETE FROM `*PREFIX*locks` WHERE `userid` = ? AND `uri` = ? AND `token` = ?';
if (OC_Config::getValue( "dbtype") === 'oci') {
//FIXME oracle hack: need to explicitly cast CLOB to CHAR for comparison
$sql = 'DELETE FROM `*PREFIX*locks` WHERE `userid` = ? AND to_char(`uri`) = ? AND `token` = ?';
}
$result = OC_DB::executeAudited( $sql, array(OC_User::getUser(), $uri, $lockInfo->token));
return $result === 1;
}
}
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