287 lines
7.0 KiB
PHP
287 lines
7.0 KiB
PHP
<?php
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/**
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* PHPIDS
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*
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* Requirements: PHP5, SimpleXML
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*
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* Copyright (c) 2008 PHPIDS group (http://php-ids.org)
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*
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* PHPIDS is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, version 3 of the License, or
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* (at your option) any later version.
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*
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* PHPIDS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with PHPIDS. If not, see <http://www.gnu.org/licenses/>.
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*
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* PHP version 5.1.6+
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*
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* @category Security
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* @package PHPIDS
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* @author Mario Heiderich <mario.heiderich@gmail.com>
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* @author Christian Matthies <ch0012@gmail.com>
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* @author Lars Strojny <lars@strojny.net>
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* @license http://www.gnu.org/licenses/lgpl.html LGPL
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* @link http://php-ids.org/
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*/
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require_once 'IDS/Caching/Interface.php';
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/**
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* Needed SQL:
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*
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#create the database
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CREATE DATABASE IF NOT EXISTS `phpids` DEFAULT CHARACTER
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SET utf8 COLLATE utf8_general_ci;
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DROP TABLE IF EXISTS `cache`;
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#now select the created datbase and create the table
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CREATE TABLE `cache` (
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`type` VARCHAR( 32 ) NOT null ,
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`data` TEXT NOT null ,
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`created` DATETIME NOT null ,
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`modified` DATETIME NOT null
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) ENGINE = MYISAM ;
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*/
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/**
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* Database caching wrapper
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*
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* This class inhabits functionality to get and set cache via a database.
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*
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* @category Security
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* @package PHPIDS
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* @author Christian Matthies <ch0012@gmail.com>
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* @author Mario Heiderich <mario.heiderich@gmail.com>
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* @author Lars Strojny <lars@strojny.net>
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* @copyright 2007 The PHPIDS Groupup
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* @license http://www.gnu.org/licenses/lgpl.html LGPL
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* @version Release: $Id:Database.php 517 2007-09-15 15:04:13Z mario $
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* @link http://php-ids.org/
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* @since Version 0.4
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*/
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class IDS_Caching_Database implements IDS_Caching_Interface
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{
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/**
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* Caching type
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*
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* @var string
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*/
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private $type = null;
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/**
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* Cache configuration
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*
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* @var array
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*/
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private $config = null;
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/**
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* DBH
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*
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* @var object
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*/
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private $handle = null;
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/**
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* Holds an instance of this class
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*
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* @var object
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*/
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private static $cachingInstance = null;
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/**
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* Constructor
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*
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* Connects to database.
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*
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* @param string $type caching type
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* @param array $init the IDS_Init object
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*
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* @return void
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*/
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public function __construct($type, $init)
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{
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$this->type = $type;
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$this->config = $init->config['Caching'];
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$this->handle = $this->_connect();
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}
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/**
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* Returns an instance of this class
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*
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* @param string $type caching type
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* @param array $init the IDS_Init object
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*
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* @return object $this
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*/
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public static function getInstance($type, $init)
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{
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if (!self::$cachingInstance) {
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self::$cachingInstance = new IDS_Caching_Database($type, $init);
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}
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return self::$cachingInstance;
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}
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/**
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* Writes cache data into the database
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*
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* @param array $data the caching data
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*
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* @throws PDOException if a db error occurred
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* @return object $this
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*/
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public function setCache(array $data)
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{
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$handle = $this->handle;
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$rows = $handle->query('SELECT created FROM `' .
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$handle->quote($this->config['table']).'`');
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if (!$rows || $rows->rowCount() === 0) {
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$this->_write($handle, $data);
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} else {
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foreach ($rows as $row) {
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if ((time()-strtotime($row['created'])) >
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$this->config['expiration_time']) {
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$this->_write($handle, $data);
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}
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}
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}
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return $this;
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}
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/**
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* Returns the cached data
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*
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* Note that this method returns false if either type or file cache is
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* not set
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*
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* @throws PDOException if a db error occurred
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* @return mixed cache data or false
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*/
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public function getCache()
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{
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try{
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$handle = $this->handle;
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$result = $handle->prepare('SELECT * FROM ' .
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$handle->quote($this->config['table']) .
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' where type=?');
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$result->execute(array($this->type));
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foreach ($result as $row) {
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return unserialize($row['data']);
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}
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} catch (PDOException $e) {
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die('PDOException: ' . $e->getMessage());
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}
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return false;
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}
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/**
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* Connect to database and return a handle
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*
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* @return object dbh
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* @throws PDOException if a db error occurred
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*/
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private function _connect()
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{
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// validate connection parameters
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if (!$this->config['wrapper']
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|| !$this->config['user']
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|| !$this->config['password']
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|| !$this->config['table']) {
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throw new Exception('
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Insufficient connection parameters'
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);
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}
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// try to connect
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try {
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$handle = new PDO(
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$this->config['wrapper'],
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$this->config['user'],
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$this->config['password']
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);
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} catch (PDOException $e) {
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die('PDOException: ' . $e->getMessage());
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}
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return $handle;
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}
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/**
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* Write the cache data to the table
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*
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* @param object $handle the database handle
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* @param array $data the caching data
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*
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* @return object dbh
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* @throws PDOException if a db error occurred
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*/
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private function _write($handle, $data)
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{
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try {
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$handle->query('TRUNCATE ' .
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$this->config['table'].'');
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$statement = $handle->prepare('
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INSERT INTO `' .
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$this->config['table'].'` (
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type,
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data,
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created,
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modified
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)
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VALUES (
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:type,
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:data,
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now(),
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now()
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)
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');
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$statement->bindParam('type',
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$handle->quote($this->type));
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$statement->bindParam('data', serialize($data));
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if (!$statement->execute()) {
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throw new PDOException($statement->errorCode());
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}
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} catch (PDOException $e) {
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die('PDOException: ' . $e->getMessage());
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}
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}
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}
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/**
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 expandtab
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*/
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