<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
* Copyright (c) 2019-2020 CodeIgniter Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2019-2020 CodeIgniter Foundation
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 4.0.0
* @filesource
*/
namespace CodeIgniter\Cache\Handlers;
use CodeIgniter\Cache\CacheInterface;
use CodeIgniter\Cache\Exceptions\CacheException;
/**
* File system cache handler
*/
class FileHandler implements CacheInterface
{
/**
* Prefixed to all cache names.
*
* @var string
*/
protected $prefix;
/**
* Where to store cached files on the disk.
*
* @var string
*/
protected $path;
//--------------------------------------------------------------------
/**
* Constructor.
*
* @param \Config\Cache $config
* @throws CacheException
*/
public function __construct($config)
{
$path = ! empty($config->storePath) ? $config->storePath : WRITEPATH . 'cache';
if (! is_really_writable($path))
{
throw CacheException::forUnableToWrite($path);
}
$this->prefix = $config->prefix ?: '';
$this->path = rtrim($path, '/') . '/';
}
//--------------------------------------------------------------------
/**
* Takes care of any handler-specific setup that must be done.
*/
public function initialize()
{
// Not to see here...
}
//--------------------------------------------------------------------
/**
* Attempts to fetch an item from the cache store.
*
* @param string $key Cache item name
*
* @return mixed
*/
public function get(string $key)
{
$key = $this->prefix . $key;
$data = $this->getItem($key);
return is_array($data) ? $data['data'] : null;
}
//--------------------------------------------------------------------
/**
* Saves an item to the cache store.
*
* @param string $key Cache item name
* @param mixed $value The data to save
* @param integer $ttl Time To Live, in seconds (default 60)
*
* @return mixed
*/
public function save(string $key, $value, int $ttl = 60)
{
$key = $this->prefix . $key;
$contents = [
'time' => time(),
'ttl' => $ttl,
'data' => $value,
];
if ($this->writeFile($this->path . $key, serialize($contents)))
{
chmod($this->path . $key, 0640);
return true;
}
return false;
}
//--------------------------------------------------------------------
/**
* Deletes a specific item from the cache store.
*
* @param string $key Cache item name
*
* @return boolean
*/
public function delete(string $key)
{
$key = $this->prefix . $key;
return is_file($this->path . $key) && unlink($this->path . $key);
}
//--------------------------------------------------------------------
/**
* Performs atomic incrementation of a raw stored value.
*
* @param string $key Cache ID
* @param integer $offset Step/value to increase by
*
* @return mixed
*/
public function increment(string $key, int $offset = 1)
{
$key = $this->prefix . $key;
$data = $this->getItem($key);
if ($data === false)
{
$data = [
'data' => 0,
'ttl' => 60,
];
}
elseif (! is_int($data['data']))
{
return false;
}
$new_value = $data['data'] + $offset;
return $this->save($key, $new_value, $data['ttl']) ? $new_value : false;
}
//--------------------------------------------------------------------
/**
* Performs atomic decrementation of a raw stored value.
*
* @param string $key Cache ID
* @param integer $offset Step/value to increase by
*
* @return mixed
*/
public function decrement(string $key, int $offset = 1)
{
$key = $this->prefix . $key;
$data = $this->getItem($key);
if ($data === false)
{
$data = [
'data' => 0,
'ttl' => 60,
];
}
elseif (! is_int($data['data']))
{
return false;
}
$new_value = $data['data'] - $offset;
return $this->save($key, $new_value, $data['ttl']) ? $new_value : false;
}
//--------------------------------------------------------------------
/**
* Will delete all items in the entire cache.
*
* @return boolean
*/
public function clean()
{
return $this->deleteFiles($this->path, false, true);
}
//--------------------------------------------------------------------
/**
* Returns information on the entire cache.
*
* The information returned and the structure of the data
* varies depending on the handler.
*
* @return mixed
*/
public function getCacheInfo()
{
return $this->getDirFileInfo($this->path);
}
//--------------------------------------------------------------------
/**
* Returns detailed information about the specific item in the cache.
*
* @param string $key Cache item name.
*
* @return mixed
*/
public function getMetaData(string $key)
{
$key = $this->prefix . $key;
if (! is_file($this->path . $key))
{
return false;
}
$data = @unserialize(file_get_contents($this->path . $key));
if (is_array($data))
{
$mtime = filemtime($this->path . $key);
if (! isset($data['ttl']))
{
return false;
}
return [
'expire' => $mtime + $data['ttl'],
'mtime' => $mtime,
'data' => $data['data'],
];
}
return false;
}
//--------------------------------------------------------------------
/**
* Determines if the driver is supported on this system.
*
* @return boolean
*/
public function isSupported(): bool
{
return is_writable($this->path);
}
//--------------------------------------------------------------------
/**
* Does the heavy lifting of actually retrieving the file and
* verifying it's age.
*
* @param string $key
*
* @return boolean|mixed
*/
protected function getItem(string $key)
{
if (! is_file($this->path . $key))
{
return false;
}
$data = unserialize(file_get_contents($this->path . $key));
if ($data['ttl'] > 0 && time() > $data['time'] + $data['ttl'])
{
// If the file is still there then remove it
if (is_file($this->path . $key))
{
unlink($this->path . $key);
}
return false;
}
return $data;
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// SUPPORT METHODS FOR FILES
//--------------------------------------------------------------------
/**
* Writes a file to disk, or returns false if not successful.
*
* @param string $path
* @param string $data
* @param string $mode
*
* @return boolean
*/
protected function writeFile($path, $data, $mode = 'wb')
{
if (($fp = @fopen($path, $mode)) === false)
{
return false;
}
flock($fp, LOCK_EX);
for ($result = $written = 0, $length = strlen($data); $written < $length; $written += $result)
{
if (($result = fwrite($fp, substr($data, $written))) === false)
{
break;
}
}
flock($fp, LOCK_UN);
fclose($fp);
return is_int($result);
}
//--------------------------------------------------------------------
/**
* Delete Files
*
* Deletes all files contained in the supplied directory path.
* Files must be writable or owned by the system in order to be deleted.
* If the second parameter is set to TRUE, any directories contained
* within the supplied base directory will be nuked as well.
*
* @param string $path File path
* @param boolean $del_dir Whether to delete any directories found in the path
* @param boolean $htdocs Whether to skip deleting .htaccess and index page files
* @param integer $_level Current directory depth level (default: 0; internal use only)
*
* @return boolean
*/
protected function deleteFiles(string $path, bool $del_dir = false, bool $htdocs = false, int $_level = 0): bool
{
// Trim the trailing slash
$path = rtrim($path, '/\\');
if (! $current_dir = @opendir($path))
{
return false;
}
while (false !== ($filename = @readdir($current_dir)))
{
if ($filename !== '.' && $filename !== '..')
{
if (is_dir($path . DIRECTORY_SEPARATOR . $filename) && $filename[0] !== '.')
{
$this->deleteFiles($path . DIRECTORY_SEPARATOR . $filename, $del_dir, $htdocs, $_level + 1);
}
elseif ($htdocs !== true || ! preg_match('/^(\.htaccess|index\.(html|htm|php)|web\.config)$/i', $filename))
{
@unlink($path . DIRECTORY_SEPARATOR . $filename);
}
}
}
closedir($current_dir);
return ($del_dir === true && $_level > 0) ? @rmdir($path) : true;
}
//--------------------------------------------------------------------
/**
* Get Directory File Information
*
* Reads the specified directory and builds an array containing the filenames,
* filesize, dates, and permissions
*
* Any sub-folders contained within the specified path are read as well.
*
* @param string $source_dir Path to source
* @param boolean $top_level_only Look only at the top level directory specified?
* @param boolean $_recursion Internal variable to determine recursion status - do not use in calls
*
* @return array|false
*/
protected function getDirFileInfo(string $source_dir, bool $top_level_only = true, bool $_recursion = false)
{
static $_filedata = [];
$relative_path = $source_dir;
if ($fp = @opendir($source_dir))
{
// reset the array and make sure $source_dir has a trailing slash on the initial call
if ($_recursion === false)
{
$_filedata = [];
$source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
}
// Used to be foreach (scandir($source_dir, 1) as $file), but scandir() is simply not as fast
while (false !== ($file = readdir($fp)))
{
if (is_dir($source_dir . $file) && $file[0] !== '.' && $top_level_only === false)
{
$this->getDirFileInfo($source_dir . $file . DIRECTORY_SEPARATOR, $top_level_only, true);
}
elseif ($file[0] !== '.')
{
$_filedata[$file] = $this->getFileInfo($source_dir . $file);
$_filedata[$file]['relative_path'] = $relative_path;
}
}
closedir($fp);
return $_filedata;
}
return false;
}
//--------------------------------------------------------------------
/**
* Get File Info
*
* Given a file and path, returns the name, path, size, date modified
* Second parameter allows you to explicitly declare what information you want returned
* Options are: name, server_path, size, date, readable, writable, executable, fileperms
* Returns FALSE if the file cannot be found.
*
* @param string $file Path to file
* @param mixed $returned_values Array or comma separated string of information returned
*
* @return array|false
*/
protected function getFileInfo(string $file, $returned_values = ['name', 'server_path', 'size', 'date'])
{
if (! is_file($file))
{
return false;
}
if (is_string($returned_values))
{
$returned_values = explode(',', $returned_values);
}
foreach ($returned_values as $key)
{
switch ($key)
{
case 'name':
$fileInfo['name'] = basename($file);
break;
case 'server_path':
$fileInfo['server_path'] = $file;
break;
case 'size':
$fileInfo['size'] = filesize($file);
break;
case 'date':
$fileInfo['date'] = filemtime($file);
break;
case 'readable':
$fileInfo['readable'] = is_readable($file);
break;
case 'writable':
$fileInfo['writable'] = is_writable($file);
break;
case 'executable':
$fileInfo['executable'] = is_executable($file);
break;
case 'fileperms':
$fileInfo['fileperms'] = fileperms($file);
break;
}
}
return $fileInfo;
}
//--------------------------------------------------------------------
}
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