<?php
namespace Sabre\DAV\Locks\Backend;
use Sabre\DAV\Locks\LockInfo;
/**
* This Lock Backend stores all its data in the filesystem in separate file per
* node.
*
* This Lock Manager is now deprecated. It has a bug that allows parent
* collections to be deletes when children deeper in the tree are locked.
*
* This also means that using this backend means you will not pass the Neon
* Litmus test.
*
* You are recommended to use either the PDO or the File backend instead.
*
* @deprecated
* @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class FS extends AbstractBackend {
/**
* The default data directory
*
* @var string
*/
private $dataDir;
public function __construct($dataDir) {
$this->dataDir = $dataDir;
}
protected function getFileNameForUri($uri) {
return $this->dataDir . '/sabredav_' . md5($uri) . '.locks';
}
/**
* 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) {
$lockList = array();
$currentPath = '';
foreach(explode('/',$uri) as $uriPart) {
// weird algorithm that can probably be improved, but we're traversing the path top down
if ($currentPath) $currentPath.='/';
$currentPath.=$uriPart;
$uriLocks = $this->getData($currentPath);
foreach($uriLocks as $uriLock) {
// Unless we're on the leaf of the uri-tree we should ignore locks with depth 0
if($uri==$currentPath || $uriLock->depth!=0) {
$uriLock->uri = $currentPath;
$lockList[] = $uriLock;
}
}
}
// Checking if we can remove any of these locks
foreach($lockList as $k=>$lock) {
if (time() > $lock->timeout + $lock->created) unset($lockList[$k]);
}
return $lockList;
}
/**
* Locks a uri
*
* @param string $uri
* @param LockInfo $lockInfo
* @return bool
*/
public function lock($uri, LockInfo $lockInfo) {
// We're making the lock timeout 30 minutes
$lockInfo->timeout = 1800;
$lockInfo->created = time();
$locks = $this->getLocks($uri,false);
foreach($locks as $k=>$lock) {
if ($lock->token == $lockInfo->token) unset($locks[$k]);
}
$locks[] = $lockInfo;
$this->putData($uri,$locks);
return true;
}
/**
* Removes a lock from a uri
*
* @param string $uri
* @param LockInfo $lockInfo
* @return bool
*/
public function unlock($uri, LockInfo $lockInfo) {
$locks = $this->getLocks($uri,false);
foreach($locks as $k=>$lock) {
if ($lock->token == $lockInfo->token) {
unset($locks[$k]);
$this->putData($uri,$locks);
return true;
}
}
return false;
}
/**
* Returns the stored data for a uri
*
* @param string $uri
* @return array
*/
protected function getData($uri) {
$path = $this->getFilenameForUri($uri);
if (!file_exists($path)) return array();
// opening up the file, and creating a shared lock
$handle = fopen($path,'r');
flock($handle,LOCK_SH);
$data = '';
// Reading data until the eof
while(!feof($handle)) {
$data.=fread($handle,8192);
}
// We're all good
fclose($handle);
// Unserializing and checking if the resource file contains data for this file
$data = unserialize($data);
if (!$data) return array();
return $data;
}
/**
* Updates the lock information
*
* @param string $uri
* @param array $newData
* @return void
*/
protected function putData($uri,array $newData) {
$path = $this->getFileNameForUri($uri);
// opening up the file, and creating a shared lock
$handle = fopen($path,'a+');
flock($handle,LOCK_EX);
ftruncate($handle,0);
rewind($handle);
fwrite($handle,serialize($newData));
fclose($handle);
}
}
