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<?php
/**
* The Lock manager allows you to handle all file-locks centrally.
*
* This Lock Manager stores all its data in a database. You must pass a PDO
* connection object in the constructor.
*
* @package Sabre
* @subpackage DAV
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_DAV_Locks_Backend_PDO extends Sabre_DAV_Locks_Backend_Abstract {
/**
* The PDO connection object
*
* @var pdo
*/
private $pdo;
/**
* The PDO tablename this backend uses.
*
* @var string
*/
protected $tableName;
/**
* Constructor
*
* @param PDO $pdo
* @param string $tableName
*/
public function __construct(PDO $pdo, $tableName = 'locks') {
$this->pdo = $pdo;
$this->tableName = $tableName;
}
/**
* 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 concatenation prevents us
// from doing this though.
$query = 'SELECT owner, token, timeout, created, scope, depth, uri FROM '.$this->tableName.' WHERE ((created + timeout) > CAST(? AS UNSIGNED INTEGER)) AND ((uri = ?)';
$params = array(time(),$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;
$query.=' OR (depth!=0 AND uri = ?)';
$params[] = $currentPath;
}
if ($returnChildLocks) {
$query.=' OR (uri LIKE ?)';
$params[] = $uri . '/%';
}
$query.=')';
$stmt = $this->pdo->prepare($query);
$stmt->execute($params);
$result = $stmt->fetchAll();
$lockList = array();
foreach($result as $row) {
$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 30 minutes
$lockInfo->timeout = 30*60;
$lockInfo->created = time();
$lockInfo->uri = $uri;
$locks = $this->getLocks($uri,false);
$exists = false;
foreach($locks as $lock) {
if ($lock->token == $lockInfo->token) $exists = true;
}
if ($exists) {
$stmt = $this->pdo->prepare('UPDATE '.$this->tableName.' SET owner = ?, timeout = ?, scope = ?, depth = ?, uri = ?, created = ? WHERE token = ?');
$stmt->execute(array($lockInfo->owner,$lockInfo->timeout,$lockInfo->scope,$lockInfo->depth,$uri,$lockInfo->created,$lockInfo->token));
} else {
$stmt = $this->pdo->prepare('INSERT INTO '.$this->tableName.' (owner,timeout,scope,depth,uri,created,token) VALUES (?,?,?,?,?,?,?)');
$stmt->execute(array($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) {
$stmt = $this->pdo->prepare('DELETE FROM '.$this->tableName.' WHERE uri = ? AND token = ?');
$stmt->execute(array($uri,$lockInfo->token));
return $stmt->rowCount()===1;
}
}
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