/usr/share/php/sabre21/Sabre/DAV/Locks/Backend/File.php is in php-sabre-dav-2.1 2.1.10-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | <?php
namespace Sabre\DAV\Locks\Backend;
use Sabre\DAV\Locks\LockInfo;
/**
* This Locks backend stores all locking information in a single file.
*
* Note that this is not nearly as robust as a database. If you are considering
* using this backend, keep in mind that the PDO backend can work with SqLite,
* which is designed to be a good file-based database.
*
* It literally solves the problem this class solves as well, but much better.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class File extends AbstractBackend {
/**
* The storage file
*
* @var string
*/
private $locksFile;
/**
* Constructor
*
* @param string $locksFile path to file
*/
function __construct($locksFile) {
$this->locksFile = $locksFile;
}
/**
* 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 $returnChildLocks
* @return array
*/
function getLocks($uri, $returnChildLocks) {
$newLocks = [];
$locks = $this->getData();
foreach($locks as $lock) {
if ($lock->uri === $uri ||
//deep locks on parents
($lock->depth!=0 && strpos($uri, $lock->uri . '/')===0) ||
// locks on children
($returnChildLocks && (strpos($lock->uri, $uri . '/')===0)) ) {
$newLocks[] = $lock;
}
}
// Checking if we can remove any of these locks
foreach($newLocks as $k=>$lock) {
if (time() > $lock->timeout + $lock->created) unset($newLocks[$k]);
}
return $newLocks;
}
/**
* Locks a uri
*
* @param string $uri
* @param LockInfo $lockInfo
* @return bool
*/
function lock($uri, LockInfo $lockInfo) {
// We're making the lock timeout 30 minutes
$lockInfo->timeout = 1800;
$lockInfo->created = time();
$lockInfo->uri = $uri;
$locks = $this->getData();
foreach($locks as $k=>$lock) {
if (
($lock->token == $lockInfo->token) ||
(time() > $lock->timeout + $lock->created)
) {
unset($locks[$k]);
}
}
$locks[] = $lockInfo;
$this->putData($locks);
return true;
}
/**
* Removes a lock from a uri
*
* @param string $uri
* @param LockInfo $lockInfo
* @return bool
*/
function unlock($uri, LockInfo $lockInfo) {
$locks = $this->getData();
foreach($locks as $k=>$lock) {
if ($lock->token == $lockInfo->token) {
unset($locks[$k]);
$this->putData($locks);
return true;
}
}
return false;
}
/**
* Loads the lockdata from the filesystem.
*
* @return array
*/
protected function getData() {
if (!file_exists($this->locksFile)) return [];
// opening up the file, and creating a shared lock
$handle = fopen($this->locksFile,'r');
flock($handle,LOCK_SH);
// Reading data until the eof
$data = stream_get_contents($handle);
// We're all good
flock($handle,LOCK_UN);
fclose($handle);
// Unserializing and checking if the resource file contains data for this file
$data = unserialize($data);
if (!$data) return [];
return $data;
}
/**
* Saves the lockdata
*
* @param array $newData
* @return void
*/
protected function putData(array $newData) {
// opening up the file, and creating an exclusive lock
$handle = fopen($this->locksFile,'a+');
flock($handle,LOCK_EX);
// We can only truncate and rewind once the lock is acquired.
ftruncate($handle,0);
rewind($handle);
fwrite($handle,serialize($newData));
flock($handle,LOCK_UN);
fclose($handle);
}
}
|