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https://git.friendi.ca/friendica/friendica-addons.git
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182 lines
4.3 KiB
PHP
182 lines
4.3 KiB
PHP
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<?php
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/**
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* The Lock manager allows you to handle all file-locks centrally.
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*
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* This Lock Manager stores all its data in a single file.
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*
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* Note that this is not nearly as robust as a database, you are encouraged
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* to use the PDO backend instead.
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*
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* @package Sabre
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* @subpackage DAV
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* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
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* @author Evert Pot (http://www.rooftopsolutions.nl/)
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* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
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*/
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class Sabre_DAV_Locks_Backend_File extends Sabre_DAV_Locks_Backend_Abstract {
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/**
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* The storage file
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*
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* @var string
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*/
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private $locksFile;
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/**
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* Constructor
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*
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* @param string $locksFile path to file
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*/
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public function __construct($locksFile) {
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$this->locksFile = $locksFile;
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}
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/**
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* Returns a list of Sabre_DAV_Locks_LockInfo objects
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*
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* This method should return all the locks for a particular uri, including
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* locks that might be set on a parent uri.
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*
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* If returnChildLocks is set to true, this method should also look for
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* any locks in the subtree of the uri for locks.
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*
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* @param string $uri
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* @param bool $returnChildLocks
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* @return array
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*/
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public function getLocks($uri, $returnChildLocks) {
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$newLocks = array();
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$locks = $this->getData();
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foreach($locks as $lock) {
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if ($lock->uri === $uri ||
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//deep locks on parents
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($lock->depth!=0 && strpos($uri, $lock->uri . '/')===0) ||
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// locks on children
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($returnChildLocks && (strpos($lock->uri, $uri . '/')===0)) ) {
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$newLocks[] = $lock;
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}
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}
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// Checking if we can remove any of these locks
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foreach($newLocks as $k=>$lock) {
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if (time() > $lock->timeout + $lock->created) unset($newLocks[$k]);
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}
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return $newLocks;
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}
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/**
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* Locks a uri
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*
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* @param string $uri
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* @param Sabre_DAV_Locks_LockInfo $lockInfo
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* @return bool
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*/
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public function lock($uri, Sabre_DAV_Locks_LockInfo $lockInfo) {
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// We're making the lock timeout 30 minutes
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$lockInfo->timeout = 1800;
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$lockInfo->created = time();
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$lockInfo->uri = $uri;
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$locks = $this->getData();
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foreach($locks as $k=>$lock) {
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if (
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($lock->token == $lockInfo->token) ||
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(time() > $lock->timeout + $lock->created)
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) {
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unset($locks[$k]);
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}
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}
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$locks[] = $lockInfo;
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$this->putData($locks);
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return true;
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}
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/**
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* Removes a lock from a uri
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*
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* @param string $uri
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* @param Sabre_DAV_Locks_LockInfo $lockInfo
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* @return bool
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*/
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public function unlock($uri, Sabre_DAV_Locks_LockInfo $lockInfo) {
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$locks = $this->getData();
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foreach($locks as $k=>$lock) {
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if ($lock->token == $lockInfo->token) {
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unset($locks[$k]);
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$this->putData($locks);
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return true;
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}
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}
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return false;
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}
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/**
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* Loads the lockdata from the filesystem.
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*
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* @return array
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*/
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protected function getData() {
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if (!file_exists($this->locksFile)) return array();
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// opening up the file, and creating a shared lock
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$handle = fopen($this->locksFile,'r');
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flock($handle,LOCK_SH);
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// Reading data until the eof
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$data = stream_get_contents($handle);
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// We're all good
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fclose($handle);
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// Unserializing and checking if the resource file contains data for this file
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$data = unserialize($data);
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if (!$data) return array();
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return $data;
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}
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/**
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* Saves the lockdata
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*
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* @param array $newData
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* @return void
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*/
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protected function putData(array $newData) {
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// opening up the file, and creating an exclusive lock
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$handle = fopen($this->locksFile,'a+');
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flock($handle,LOCK_EX);
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// We can only truncate and rewind once the lock is acquired.
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ftruncate($handle,0);
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rewind($handle);
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fwrite($handle,serialize($newData));
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fclose($handle);
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}
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}
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