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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
jimport('joomla.filesystem.file');
/**
* File cache storage handler
*
* @package Joomla.Platform
* @subpackage Cache
* @since 11.1
*/
class JCacheStorageFile extends JCacheStorage
{
/**
* @var string
* @since 11.1
*/
protected $_root;
/**
* Constructor
*
* @param array $options Optional parameters
*
* @since 11.1
*/
public function __construct($options = array())
{
parent::__construct($options);
$this->_root = $options['cachebase'];
}
// NOTE: raw php calls are up to 100 times faster than JFile or JFolder
/**
* Get cached data from a file by id and group
*
* @param string $id The cache data id
* @param string $group The cache data group
* @param boolean $checkTime True to verify cache time expiration threshold
*
* @return mixed Boolean false on failure or a cached data string
*
* @since 11.1
*/
public function get($id, $group, $checkTime = true)
{
$data = false;
$path = $this->_getFilePath($id, $group);
if ($checkTime == false || ($checkTime == true && $this->_checkExpire($id, $group) === true))
{
if (file_exists($path))
{
$data = file_get_contents($path);
if ($data)
{
// Remove the initial die() statement
$data = str_replace('<?php die("Access Denied"); ?>#x#', '', $data);
}
}
return $data;
}
else
{
return false;
}
}
/**
* Get all cached data
*
* @return array The cached data
*
* @since 11.1
*/
public function getAll()
{
parent::getAll();
$path = $this->_root;
$folders = $this->_folders($path);
$data = array();
foreach ($folders as $folder)
{
$files = array();
$files = $this->_filesInFolder($path . '/' . $folder);
$item = new JCacheStorageHelper($folder);
foreach ($files as $file)
{
$item->updateSize(filesize($path . '/' . $folder . '/' . $file) / 1024);
}
$data[$folder] = $item;
}
return $data;
}
/**
* Store the data to a file by id and group
*
* @param string $id The cache data id
* @param string $group The cache data group
* @param string $data The data to store in cache
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function store($id, $group, $data)
{
$written = false;
$path = $this->_getFilePath($id, $group);
$die = '<?php die("Access Denied"); ?>#x#';
// Prepend a die string
$data = $die . $data;
$_fileopen = @fopen($path, "wb");
if ($_fileopen)
{
$len = strlen($data);
@fwrite($_fileopen, $data, $len);
$written = true;
}
// Data integrity check
if ($written && ($data == file_get_contents($path)))
{
return true;
}
else
{
return false;
}
}
/**
* Remove a cached data file by id and group
*
* @param string $id The cache data id
* @param string $group The cache data group
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function remove($id, $group)
{
$path = $this->_getFilePath($id, $group);
if (!@unlink($path))
{
return false;
}
return true;
}
/**
* Clean cache for a group given a mode.
*
* @param string $group The cache data group
* @param string $mode The mode for cleaning cache [group|notgroup]
* group mode : cleans all cache in the group
* notgroup mode : cleans all cache not in the group
*
* @return boolean True on success, false otherwise
*
* @since 11.1
*/
public function clean($group, $mode = null)
{
$return = true;
$folder = $group;
if (trim($folder) == '')
{
$mode = 'notgroup';
}
switch ($mode)
{
case 'notgroup':
$folders = $this->_folders($this->_root);
for ($i = 0, $n = count($folders); $i < $n; $i++)
{
if ($folders[$i] != $folder)
{
$return |= $this->_deleteFolder($this->_root . '/' . $folders[$i]);
}
}
break;
case 'group':
default:
if (is_dir($this->_root . '/' . $folder))
{
$return = $this->_deleteFolder($this->_root . '/' . $folder);
}
break;
}
return $return;
}
/**
* Garbage collect expired cache data
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function gc()
{
$result = true;
// files older than lifeTime get deleted from cache
$files = $this->_filesInFolder($this->_root, '', true, true, array('.svn', 'CVS', '.DS_Store', '__MACOSX', 'index.html'));
foreach ($files as $file)
{
$time = @filemtime($file);
if (($time + $this->_lifetime) < $this->_now || empty($time))
{
$result |= @unlink($file);
}
}
return $result;
}
/**
* Test to see if the cache storage is available.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public static function test()
{
$conf = JFactory::getConfig();
return is_writable($conf->get('cache_path', JPATH_CACHE));
}
/**
* Lock cached item
*
* @param string $id The cache data id
* @param string $group The cache data group
* @param integer $locktime Cached item max lock time
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function lock($id, $group, $locktime)
{
$returning = new stdClass;
$returning->locklooped = false;
$looptime = $locktime * 10;
$path = $this->_getFilePath($id, $group);
$_fileopen = @fopen($path, "r+b");
if ($_fileopen)
{
$data_lock = @flock($_fileopen, LOCK_EX);
}
else
{
$data_lock = false;
}
if ($data_lock === false)
{
$lock_counter = 0;
// loop until you find that the lock has been released. that implies that data get from other thread has finished
while ($data_lock === false)
{
if ($lock_counter > $looptime)
{
$returning->locked = false;
$returning->locklooped = true;
break;
}
usleep(100);
$data_lock = @flock($_fileopen, LOCK_EX);
$lock_counter++;
}
}
$returning->locked = $data_lock;
return $returning;
}
/**
* Unlock cached item
*
* @param string $id The cache data id
* @param string $group The cache data group
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function unlock($id, $group = null)
{
$path = $this->_getFilePath($id, $group);
$_fileopen = @fopen($path, "r+b");
if ($_fileopen)
{
$ret = @flock($_fileopen, LOCK_UN);
@fclose($_fileopen);
}
return $ret;
}
/**
* Check to make sure cache is still valid, if not, delete it.
*
* @param string $id Cache key to expire.
* @param string $group The cache data group.
*
* @return boolean False if not valid
*
* @since 11.1
*/
protected function _checkExpire($id, $group)
{
$path = $this->_getFilePath($id, $group);
// check prune period
if (file_exists($path))
{
$time = @filemtime($path);
if (($time + $this->_lifetime) < $this->_now || empty($time))
{
@unlink($path);
return false;
}
return true;
}
return false;
}
/**
* Get a cache file path from an id/group pair
*
* @param string $id The cache data id
* @param string $group The cache data group
*
* @return string The cache file path
*
* @since 11.1
*/
protected function _getFilePath($id, $group)
{
$name = $this->_getCacheId($id, $group);
$dir = $this->_root . '/' . $group;
// If the folder doesn't exist try to create it
if (!is_dir($dir))
{
// Make sure the index file is there
$indexFile = $dir . '/index.html';
@ mkdir($dir) && file_put_contents($indexFile, '<!DOCTYPE html><title></title>');
}
// Make sure the folder exists
if (!is_dir($dir))
{
return false;
}
return $dir . '/' . $name . '.php';
}
/**
* Quickly delete a folder of files
*
* @param string $path The path to the folder to delete.
*
* @return boolean True on success.
*
* @since 11.1
*/
protected function _deleteFolder($path)
{
// Sanity check
if (!$path || !is_dir($path) || empty($this->_root))
{
// Bad programmer! Bad Bad programmer!
JError::raiseWarning(500, 'JCacheStorageFile::_deleteFolder ' . JText::_('JLIB_FILESYSTEM_ERROR_DELETE_BASE_DIRECTORY'));
return false;
}
$path = $this->_cleanPath($path);
// Check to make sure path is inside cache folder, we do not want to delete Joomla root!
$pos = strpos($path, $this->_cleanPath($this->_root));
if ($pos === false || $pos > 0)
{
JError::raiseWarning(500, 'JCacheStorageFile::_deleteFolder' . JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path));
return false;
}
// Remove all the files in folder if they exist; disable all filtering
$files = $this->_filesInFolder($path, '.', false, true, array(), array());
if (!empty($files) && !is_array($files))
{
if (@unlink($files) !== true)
{
return false;
}
}
elseif (!empty($files) && is_array($files))
{
foreach ($files as $file)
{
$file = $this->_cleanPath($file);
// In case of restricted permissions we zap it one way or the other
// as long as the owner is either the webserver or the ftp
if (@unlink($file))
{
// Do nothing
}
else
{
$filename = basename($file);
JError::raiseWarning('SOME_ERROR_CODE', 'JCacheStorageFile::_deleteFolder' . JText::sprintf('JLIB_FILESYSTEM_DELETE_FAILED', $filename));
return false;
}
}
}
// Remove sub-folders of folder; disable all filtering
$folders = $this->_folders($path, '.', false, true, array(), array());
foreach ($folders as $folder)
{
if (is_link($folder))
{
// Don't descend into linked directories, just delete the link.
if (@unlink($folder) !== true)
{
return false;
}
}
elseif ($this->_deleteFolder($folder) !== true)
{
return false;
}
}
// In case of restricted permissions we zap it one way or the other
// as long as the owner is either the webserver or the ftp
if (@rmdir($path))
{
$ret = true;
}
else
{
JError::raiseWarning('SOME_ERROR_CODE', 'JCacheStorageFile::_deleteFolder' . JText::sprintf('JLIB_FILESYSTEM_ERROR_FOLDER_DELETE', $path));
$ret = false;
}
return $ret;
}
/**
* Function to strip additional / or \ in a path name
*
* @param string $path The path to clean
* @param string $ds Directory separator (optional)
*
* @return string The cleaned path
*
* @since 11.1
*/
protected function _cleanPath($path, $ds = DIRECTORY_SEPARATOR)
{
$path = trim($path);
if (empty($path))
{
$path = $this->_root;
}
else
{
// Remove double slashes and backslahses and convert all slashes and backslashes to DIRECTORY_SEPARATOR
$path = preg_replace('#[/\\\\]+#', $ds, $path);
}
return $path;
}
/**
* Utility function to quickly read the files in a folder.
*
* @param string $path The path of the folder to read.
* @param string $filter A filter for file names.
* @param mixed $recurse True to recursively search into sub-folders, or an
* integer to specify the maximum depth.
* @param boolean $fullpath True to return the full path to the file.
* @param array $exclude Array with names of files which should not be shown in
* the result.
* @param array $excludefilter Array of folder names to exclude
*
* @return array Files in the given folder.
*
* @since 11.1
*/
protected function _filesInFolder($path, $filter = '.', $recurse = false, $fullpath = false
, $exclude = array('.svn', 'CVS', '.DS_Store', '__MACOSX'), $excludefilter = array('^\..*', '.*~'))
{
// Initialise variables.
$arr = array();
// Check to make sure the path valid and clean
$path = $this->_cleanPath($path);
// Is the path a folder?
if (!is_dir($path))
{
JError::raiseWarning(21, 'JCacheStorageFile::_filesInFolder' . JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path));
return false;
}
// Read the source directory.
if (!($handle = @opendir($path)))
{
return $arr;
}
if (count($excludefilter))
{
$excludefilter = '/(' . implode('|', $excludefilter) . ')/';
}
else
{
$excludefilter = '';
}
while (($file = readdir($handle)) !== false)
{
if (($file != '.') && ($file != '..') && (!in_array($file, $exclude)) && (!$excludefilter || !preg_match($excludefilter, $file)))
{
$dir = $path . '/' . $file;
$isDir = is_dir($dir);
if ($isDir)
{
if ($recurse)
{
if (is_integer($recurse))
{
$arr2 = $this->_filesInFolder($dir, $filter, $recurse - 1, $fullpath);
}
else
{
$arr2 = $this->_filesInFolder($dir, $filter, $recurse, $fullpath);
}
$arr = array_merge($arr, $arr2);
}
}
else
{
if (preg_match("/$filter/", $file))
{
if ($fullpath)
{
$arr[] = $path . '/' . $file;
}
else
{
$arr[] = $file;
}
}
}
}
}
closedir($handle);
return $arr;
}
/**
* Utility function to read the folders in a folder.
*
* @param string $path The path of the folder to read.
* @param string $filter A filter for folder names.
* @param mixed $recurse True to recursively search into sub-folders, or an integer to specify the maximum depth.
* @param boolean $fullpath True to return the full path to the folders.
* @param array $exclude Array with names of folders which should not be shown in the result.
* @param array $excludefilter Array with regular expressions matching folders which should not be shown in the result.
*
* @return array Folders in the given folder.
*
* @since 11.1
*/
protected function _folders($path, $filter = '.', $recurse = false, $fullpath = false
, $exclude = array('.svn', 'CVS', '.DS_Store', '__MACOSX'), $excludefilter = array('^\..*'))
{
// Initialise variables.
$arr = array();
// Check to make sure the path valid and clean
$path = $this->_cleanPath($path);
// Is the path a folder?
if (!is_dir($path))
{
JError::raiseWarning(21, 'JCacheStorageFile::_folders' . JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path));
return false;
}
// read the source directory
if (!($handle = @opendir($path)))
{
return $arr;
}
if (count($excludefilter))
{
$excludefilter_string = '/(' . implode('|', $excludefilter) . ')/';
}
else
{
$excludefilter_string = '';
}
while (($file = readdir($handle)) !== false)
{
if (($file != '.') && ($file != '..')
&& (!in_array($file, $exclude))
&& (empty($excludefilter_string) || !preg_match($excludefilter_string, $file)))
{
$dir = $path . '/' . $file;
$isDir = is_dir($dir);
if ($isDir)
{
// Removes filtered directories
if (preg_match("/$filter/", $file))
{
if ($fullpath)
{
$arr[] = $dir;
}
else
{
$arr[] = $file;
}
}
if ($recurse)
{
if (is_integer($recurse))
{
$arr2 = $this->_folders($dir, $filter, $recurse - 1, $fullpath, $exclude, $excludefilter);
}
else
{
$arr2 = $this->_folders($dir, $filter, $recurse, $fullpath, $exclude, $excludefilter);
}
$arr = array_merge($arr, $arr2);
}
}
}
}
closedir($handle);
return $arr;
}
}