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<?php
/**
* @version $Id: fileCacheDriver.class.php 6306 2013-01-05 05:39:57Z btowles $
* @author RocketTheme http://www.rockettheme.com
* @copyright Copyright (C) 2007 - 2016 RocketTheme, LLC
* @license http://www.gnu.org/licenses/gpl-2.0.html GNU/GPLv2 only
*
*
* Original Author and Licence
* @author Mateusz 'MatheW' Wójcik, <mat.wojcik@gmail.com>
* @link http://mwojcik.pl
* @version 1.0
* @license GPL
*/
class FileCacheDriver implements GantryCacheLibDriver
{
const DEFAULT_LIFETIME = 900;
/**
* Directory with ending slash!
*
* @var string
*/
protected $dir = 'cache/';
/**
* Extension of cache file - with comma!
*
* @var string
*/
protected $ext = '.cache';
protected $lifeTime = self::DEFAULT_LIFETIME;
protected $_locking = true;
/**
* Constructor
*
* @throws CacheException
*
* @param string $dir Directory - with ending slash!
*/
public function __construct($lifeTime = self::DEFAULT_LIFETIME, $dir = NULL)
{
$this->lifeTime = $lifeTime;
if (!empty($dir) && $this->checkDirectory($dir)) $this->dir = $dir; else if (!$this->checkDirectory($this->dir)) throw new CacheException('Unable to use given directory. Check file permissions.');
}
/**
* Sets the lifetime of the cache
*
* @abstract
*
* @param int $lifeTime Lifetime of the cache
*
* @return void
*/
public function setLifeTime($lifeTime)
{
$this->lifeTime = $lifeTime;
}
/**
* Sets data to cache
*
* @param string $groupName Name of group of cache
* @param string $identifier Identifier of data
* @param mixed $data Data
*
* @return boolean
*/
public function set($groupName, $identifier, $data)
{
if (!$this->checkDirectory($this->createPath($groupName))) return false;
$written = false;
$path = $this->createPath($groupName, $identifier);
$die = '<?php die("Access Denied"); ?>' . "\n";
// Prepend a die string
$data = $die . $data;
$fp = @fopen($path, "wb");
if ($fp) {
if ($this->_locking) {
@flock($fp, LOCK_EX);
}
$len = strlen($data);
@fwrite($fp, $data, $len);
if ($this->_locking) {
@flock($fp, LOCK_UN);
}
@fclose($fp);
$written = true;
}
// Data integrity check
if ($written && ($data == file_get_contents($path))) {
return true;
} else {
return false;
}
}
/**
* Gets data from cache
*
* @param string $groupName Name of group
* @param string $identifier Identifier of data
*
* @return mixed
*/
public function get($groupName, $identifier)
{
if (time() - $this->modificationTime($groupName, $identifier) > $this->lifeTime) {
$this->clearCache($groupName, $identifier);
return false;
}
$data = false;
$path = $this->createPath($groupName, $identifier);
if (file_exists($path)) {
$data = file_get_contents($path);
if ($data) {
// Remove the initial die() statement
$data = preg_replace('/^.*\n/', '', $data);
}
}
return $data;
}
/**
* Clears cache of specified identifier of group
*
* @param string $groupName Name of group
* @param string $identifier Identifier
*
* @return boolean
*/
public function clearCache($groupName, $identifier)
{
@unlink($this->createPath($groupName, $identifier));
}
/**
* Clears cache of specified group
*
* @param string $groupName Name of group
*
* @return boolean
*/
public function clearGroupCache($groupName)
{
$this->deleteDir($this->createPath($groupName));
}
/**
* Clears all cache generated by this class with this driver
*
* @return boolean
*/
public function clearAllCache()
{
$this->deleteDir($this->dir, true);
}
/**
* Gets last modification time of specified cache data
*
* @param string $groupName Name of group
* @param string $identifier Identifier
*
* @return int
*/
public function modificationTime($groupName, $identifier)
{
return filemtime($this->createPath($groupName, $identifier));
}
/**
* Check if cache data exists
*
* @param string $groupName Name of group
* @param string $identifier Identifier
*
* @return boolean
*/
public function exists($groupName, $identifier)
{
return is_file($this->createPath($groupName, $identifier));
}
/**
* Sets cache directory
*
* @param string $dir Path to directory - with ending slash!
*
* @return void
*/
public function setDirectory($dir)
{
if ($this->checkDirectory($dir)) $this->dir = $dir; else return false;
return true;
}
/**
* Sets cache file extension
*
* @param string $ext File extension
*/
public function setExtension($ext)
{
$this->ext = $ext;
}
/**
* Check directory if it exists and is writable. It tries to create directory and give it good permissions
*
* @param string $dir
*
* @return boolean
*/
protected function checkDirectory($dir)
{
if (!is_dir($dir) && mkdir($dir, 0777) == false) return false;
if (!is_writable($dir) && chmod($dir, 0777) == false) return false;
return true;
}
/**
* Deletes directory with content
*
* @param string $dir Path to directory with ending slash
* @param boolean $contentOnly
*/
protected function deleteDir($dir, $contentOnly = false)
{
if (!$currentDir = @opendir($dir)) return;
while (FALSE !== ($fileName = @readdir($currentDir))) {
if ($fileName != "." && $fileName != "..") {
if (is_dir($dir . $fileName)) {
$this->deleteDir($dir . $fileName . '/');
} else {
@unlink($dir . $fileName);
}
}
}
@closedir($currentDir);
if (!$contentOnly) @rmdir($dir);
}
/**
* Creates path to file/directory
*
* @param string $groupName
* @param string $identifier
*
* @return string
*/
protected function createPath($groupName, $identifier = NULL)
{
return $this->dir . $groupName . '/' . (empty($identifier) ? '' : $identifier . $this->ext);
}
} /* end of class FileCacheDriver */