docker-vulnerable-dvwa/dvwa/external/phpids/0.6/lib/IDS/Caching/File.php
2016-12-02 17:19:11 -02:00

184 lines
4.7 KiB
PHP

<?php
/**
* PHPIDS
*
* Requirements: PHP5, SimpleXML
*
* Copyright (c) 2008 PHPIDS group (http://php-ids.org)
*
* PHPIDS is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, version 3 of the License, or
* (at your option) any later version.
*
* PHPIDS 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with PHPIDS. If not, see <http://www.gnu.org/licenses/>.
*
* PHP version 5.1.6+
*
* @category Security
* @package PHPIDS
* @author Mario Heiderich <mario.heiderich@gmail.com>
* @author Christian Matthies <ch0012@gmail.com>
* @author Lars Strojny <lars@strojny.net>
* @license http://www.gnu.org/licenses/lgpl.html LGPL
* @link http://php-ids.org/
*/
require_once 'IDS/Caching/Interface.php';
/**
* File caching wrapper
*
* This class inhabits functionality to get and set cache via a static flatfile.
*
* @category Security
* @package PHPIDS
* @author Christian Matthies <ch0012@gmail.com>
* @author Mario Heiderich <mario.heiderich@gmail.com>
* @author Lars Strojny <lars@strojny.net>
* @copyright 2007 The PHPIDS Group
* @license http://www.gnu.org/licenses/lgpl.html LGPL
* @version Release: $Id:File.php 517 2007-09-15 15:04:13Z mario $
* @link http://php-ids.org/
* @since Version 0.4
*/
class IDS_Caching_File implements IDS_Caching_Interface
{
/**
* Caching type
*
* @var string
*/
private $type = null;
/**
* Cache configuration
*
* @var array
*/
private $config = null;
/**
* Path to cache file
*
* @var string
*/
private $path = null;
/**
* Holds an instance of this class
*
* @var object
*/
private static $cachingInstance = null;
/**
* Constructor
*
* @param string $type caching type
* @param array $init the IDS_Init object
*
* @return void
*/
public function __construct($type, $init)
{
$this->type = $type;
$this->config = $init->config['Caching'];
$this->path = $init->getBasePath() . $this->config['path'];
if (file_exists($this->path) && !is_writable($this->path)) {
throw new Exception('Make sure all files in ' .
htmlspecialchars($this->path, ENT_QUOTES, 'UTF-8') .
'are writeable!');
}
}
/**
* Returns an instance of this class
*
* @param string $type caching type
* @param array $init the IDS_Init object
*
* @return object $this
*/
public static function getInstance($type, $init)
{
if (!self::$cachingInstance) {
self::$cachingInstance = new IDS_Caching_File($type, $init);
}
return self::$cachingInstance;
}
/**
* Writes cache data into the file
*
* @param array $data the cache data
*
* @throws Exception if cache file couldn't be created
* @return object $this
*/
public function setCache(array $data)
{
if (!is_writable(preg_replace('/[\/][^\/]+\.[^\/]++$/', null,
$this->path))) {
throw new Exception('Temp directory ' .
htmlspecialchars($this->path, ENT_QUOTES, 'UTF-8') .
' seems not writable');
}
if ((!file_exists($this->path) || (time()-filectime($this->path)) >
$this->config['expiration_time'])) {
$handle = @fopen($this->path, 'w+');
if (!$handle) {
throw new Exception("Cache file couldn't be created");
}
fwrite($handle, serialize($data));
fclose($handle);
}
return $this;
}
/**
* Returns the cached data
*
* Note that this method returns false if either type or file cache is
* not set
*
* @return mixed cache data or false
*/
public function getCache()
{
// make sure filters are parsed again if cache expired
if (file_exists($this->path) && (time()-filectime($this->path)) <
$this->config['expiration_time']) {
$data = unserialize(file_get_contents($this->path));
return $data;
}
return false;
}
}
/**
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 expandtab
*/