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

229 lines
5.8 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 memcached.
*
* @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 Groupoup
* @license http://www.gnu.org/licenses/lgpl.html LGPL
* @version Release: $Id:Memcached.php 517 2007-09-15 15:04:13Z mario $
* @link http://php-ids.org/
* @since Version 0.4
*/
class IDS_Caching_Memcached implements IDS_Caching_Interface
{
/**
* Caching type
*
* @var string
*/
private $type = null;
/**
* Cache configuration
*
* @var array
*/
private $config = null;
/**
* Path to memcache timestamp file
*
* @var string
*/
private $path = null;
/**
* Flag if the filter storage has been found in memcached
*
* @var boolean
*/
private $isCached = false;
/**
* Memcache object
*
* @var object
*/
private $memcache = null;
/**
* Holds an instance of this class
*
* @var object
*/
private static $cachingInstance = null;
/**
* Constructor
*
* @param string $type caching type
* @param array $init the IDS_Init object
*
* @throws Exception if necessary files aren't writeable
* @return void
*/
public function __construct($type, $init)
{
$this->type = $type;
$this->config = $init->config['Caching'];
$this->path = $init->getBasePath() . $this->config['path'];
$this->_connect();
if (file_exists($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::$cachingInstance = new IDS_Caching_Memcached($type, $init);
}
return self::$cachingInstance;
}
/**
* Writes cache data
*
* @param array $data the caching data
*
* @throws Exception if necessary files aren't writeable
* @return object $this
*/
public function setCache(array $data)
{
if (!file_exists($this->path)) {
$handle = fopen($this->path, 'w');
fclose($handle);
}
if (!is_writable($this->path)) {
throw new Exception('Make sure all files in ' .
htmlspecialchars($this->path, ENT_QUOTES, 'UTF-8') .
' are writeable!');
}
if(!$this->isCached) {
$this->memcache->set(
$this->config['key_prefix'] . '.storage',
$data, false, $this->config['expiration_time']
);
}
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()
{
$data = $this->memcache->get(
$this->config['key_prefix'] .
'.storage'
);
$this->isCached = !empty($data);
return $data;
}
/**
* Connect to the memcached server
*
* @throws Exception if connection parameters are insufficient
* @return void
*/
private function _connect()
{
if ($this->config['host'] && $this->config['port']) {
// establish the memcache connection
$this->memcache = new Memcache;
$this->memcache->pconnect($this->config['host'],
$this->config['port']);
$this->path = $this->config['tmp_path'];
if(isset($init->config['General']['base_path'])
&& $init->config['General']['base_path']
&& isset($init->config['General']['use_base_path'])
&& $init->config['General']['use_base_path']) {
$this->source = $init->config['General']['base_path'] . $this->path;
}
} else {
throw new Exception('Insufficient connection parameters');
}
}
}
/**
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 expandtab
*/