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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2007 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Cache\Storage;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Cache\CacheStorage;
use Joomla\CMS\Log\Log;
/**
* File cache storage handler
*
* @since 1.7.0
* @note For performance reasons this class does not use the Filesystem package's API
*/
class FileStorage extends CacheStorage
{
/**
* Root path
*
* @var string
* @since 1.7.0
*/
protected $_root;
/**
* Locked resources
*
* @var array
* @since 3.7.0
*
*/
protected $_locked_files = array();
/**
* Constructor
*
* @param array $options Optional parameters
*
* @since 1.7.0
*/
public function __construct($options = array())
{
parent::__construct($options);
$this->_root = $options['cachebase'];
// Workaround for php 5.3
$locked_files = &$this->_locked_files;
// Remove empty locked files at script shutdown.
$clearAtShutdown = function () use (&$locked_files)
{
foreach ($locked_files as $path => $handle)
{
if (is_resource($handle))
{
@flock($handle, LOCK_UN);
@fclose($handle);
}
// Delete only the existing file if it is empty.
if (@filesize($path) === 0)
{
@unlink($path);
}
unset($locked_files[$path]);
}
};
register_shutdown_function($clearAtShutdown);
}
/**
* Check if the cache contains data stored by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.7.0
*/
public function contains($id, $group)
{
return $this->_checkExpire($id, $group);
}
/**
* Get cached data by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param boolean $checkTime True to verify cache time expiration threshold
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 1.7.0
*/
public function get($id, $group, $checkTime = true)
{
$path = $this->_getFilePath($id, $group);
$close = false;
if ($checkTime == false || ($checkTime == true && $this->_checkExpire($id, $group) === true))
{
if (file_exists($path))
{
if (isset($this->_locked_files[$path]))
{
$_fileopen = $this->_locked_files[$path];
}
else
{
$_fileopen = @fopen($path, 'rb');
// There is no lock, we have to close file after store data
$close = true;
}
if ($_fileopen)
{
// On Windows system we can not use file_get_contents on the file locked by yourself
$data = stream_get_contents($_fileopen);
if ($close)
{
@fclose($_fileopen);
}
if ($data !== false)
{
// Remove the initial die() statement
return str_replace('<?php die("Access Denied"); ?>#x#', '', $data);
}
}
}
}
return false;
}
/**
* Get all cached data
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 1.7.0
*/
public function getAll()
{
$path = $this->_root;
$folders = $this->_folders($path);
$data = array();
foreach ($folders as $folder)
{
$files = $this->_filesInFolder($path . '/' . $folder);
$item = new CacheStorageHelper($folder);
foreach ($files as $file)
{
$item->updateSize(filesize($path . '/' . $folder . '/' . $file));
}
$data[$folder] = $item;
}
return $data;
}
/**
* Store the data to cache by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param string $data The data to store in cache
*
* @return boolean
*
* @since 1.7.0
*/
public function store($id, $group, $data)
{
$path = $this->_getFilePath($id, $group);
$close = false;
// Prepend a die string
$data = '<?php die("Access Denied"); ?>#x#' . $data;
if (isset($this->_locked_files[$path]))
{
$_fileopen = $this->_locked_files[$path];
// Because lock method uses flag c+b we have to truncate it manually
@ftruncate($_fileopen, 0);
}
else
{
$_fileopen = @fopen($path, 'wb');
// There is no lock, we have to close file after store data
$close = true;
}
if ($_fileopen)
{
$length = strlen($data);
$result = @fwrite($_fileopen, $data, $length);
if ($close)
{
@fclose($_fileopen);
}
return $result === $length;
}
return false;
}
/**
* Remove a cached data entry by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 1.7.0
*/
public function remove($id, $group)
{
$path = $this->_getFilePath($id, $group);
if (!@unlink($path))
{
return false;
}
return true;
}
/**
* Clean cache for a group given a mode.
*
* group mode : cleans all cache in the group
* notgroup mode : cleans all cache not in the group
*
* @param string $group The cache data group
* @param string $mode The mode for cleaning cache [group|notgroup]
*
* @return boolean
*
* @since 1.7.0
*/
public function clean($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 (bool) $return;
}
/**
* Garbage collect expired cache data
*
* @return boolean
*
* @since 1.7.0
*/
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 (bool) $result;
}
/**
* Lock cached item
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param integer $locktime Cached item max lock time
*
* @return mixed Boolean false if locking failed or an object containing properties lock and locklooped
*
* @since 1.7.0
*/
public function lock($id, $group, $locktime)
{
$returning = new \stdClass;
$returning->locklooped = false;
$looptime = $locktime * 10;
$path = $this->_getFilePath($id, $group);
$_fileopen = @fopen($path, 'c+b');
if (!$_fileopen)
{
$returning->locked = false;
return $returning;
}
$data_lock = (bool) @flock($_fileopen, LOCK_EX|LOCK_NB);
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)
{
break;
}
usleep(100);
$data_lock = (bool) @flock($_fileopen, LOCK_EX|LOCK_NB);
$lock_counter++;
}
$returning->locklooped = true;
}
if ($data_lock === true)
{
// Remember resource, flock release lock if you unset/close resource
$this->_locked_files[$path] = $_fileopen;
}
$returning->locked = $data_lock;
return $returning;
}
/**
* Unlock cached item
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 1.7.0
*/
public function unlock($id, $group = null)
{
$path = $this->_getFilePath($id, $group);
if (isset($this->_locked_files[$path]))
{
$ret = (bool) @flock($this->_locked_files[$path], LOCK_UN);
@fclose($this->_locked_files[$path]);
unset($this->_locked_files[$path]);
return $ret;
}
return true;
}
/**
* Check if a cache object has expired
*
* Using @ error suppressor here because between if we did a file_exists() and then filemsize() there will
* be a little time space when another process can delete the file and then you get PHP Warning
*
* @param string $id Cache ID to check
* @param string $group The cache data group
*
* @return boolean True if the cache ID is valid
*
* @since 1.7.0
*/
protected function _checkExpire($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($path);
return false;
}
// If, right now, the file does not exist then return false
if (@filesize($path) == 0)
{
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 $group The cache data group
*
* @return boolean|string The path to the data object or boolean false if the cache directory does not exist
*
* @since 1.7.0
*/
protected function _getFilePath($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 $path The path to the folder to delete.
*
* @return boolean
*
* @since 1.7.0
*/
protected function _deleteFolder($path)
{
// Sanity check
if (!$path || !is_dir($path) || empty($this->_root))
{
// Bad programmer! Bad, bad programmer!
Log::add(__METHOD__ . ' ' . \JText::_('JLIB_FILESYSTEM_ERROR_DELETE_BASE_DIRECTORY'), Log::WARNING, 'jerror');
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)
{
Log::add(__METHOD__ . ' ' . \JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path), Log::WARNING, 'jerror');
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($file) !== true)
{
Log::add(__METHOD__ . ' ' . \JText::sprintf('JLIB_FILESYSTEM_DELETE_FAILED', basename($file)), Log::WARNING, 'jerror');
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))
{
return true;
}
Log::add(__METHOD__ . ' ' . \JText::sprintf('JLIB_FILESYSTEM_ERROR_FOLDER_DELETE', $path), Log::WARNING, 'jerror');
return false;
}
/**
* Function to strip additional / or \ in a path name
*
* @param string $path The path to clean
* @param string $ds Directory separator (optional)
*
* @return string The cleaned path
*
* @since 1.7.0
*/
protected function _cleanPath($path, $ds = DIRECTORY_SEPARATOR)
{
$path = trim($path);
if (empty($path))
{
return $this->_root;
}
// Remove double slashes and backslashes 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 $excludefilter Array of folder names to exclude
*
* @return array Files in the given folder.
*
* @since 1.7.0
*/
protected function _filesInFolder($path, $filter = '.', $recurse = false, $fullpath = false,
$exclude = array('.svn', 'CVS', '.DS_Store', '__MACOSX'), $excludefilter = array('^\..*', '.*~'))
{
$arr = array();
// Check to make sure the path valid and clean
$path = $this->_cleanPath($path);
// Is the path a folder?
if (!is_dir($path))
{
Log::add(__METHOD__ . ' ' . \JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path), Log::WARNING, 'jerror');
return false;
}
// Read the source directory.
if (!($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_int($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 $excludefilter Array with regular expressions matching folders which should not be shown in the result.
*
* @return array Folders in the given folder.
*
* @since 1.7.0
*/
protected function _folders($path, $filter = '.', $recurse = false, $fullpath = false, $exclude = array('.svn', 'CVS', '.DS_Store', '__MACOSX'),
$excludefilter = array('^\..*'))
{
$arr = array();
// Check to make sure the path valid and clean
$path = $this->_cleanPath($path);
// Is the path a folder?
if (!is_dir($path))
{
Log::add(__METHOD__ . ' ' . \JText::sprintf('JLIB_FILESYSTEM_ERROR_PATH_IS_NOT_A_FOLDER', $path), Log::WARNING, 'jerror');
return false;
}
// Read the source directory
if (!($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_int($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;
}
}