<?php
/**
* This file is part of the CodeIgniter 4 framework.
*
* (c) CodeIgniter Foundation <admin@codeigniter.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace CodeIgniter\Cache\Handlers;
use CodeIgniter\Cache\Exceptions\CacheException;
use Config\Cache;
/**
* File system cache handler
*/
class FileHandler extends BaseHandler
{
/**
* Prefixed to all cache names.
*
* @var string
*/
protected $prefix;
/**
* Where to store cached files on the disk.
*
* @var string
*/
protected $path;
/**
* Mode for the stored files.
* Must be chmod-safe (octal).
*
* @var integer
*
* @see https://www.php.net/manual/en/function.chmod.php
*/
protected $mode;
//--------------------------------------------------------------------
/**
* Constructor.
*
* @param Cache $config
* @throws CacheException
*/
public function __construct(Cache $config)
{
if (! property_exists($config, 'file'))
{
$config->file = [
'storePath' => $config->storePath ?? WRITEPATH . 'cache',
'mode' => 0640,
];
}
$this->path = ! empty($config->file['storePath']) ? $config->file['storePath'] : WRITEPATH . 'cache';
$this->path = rtrim($this->path, '/') . '/';
if (! is_really_writable($this->path))
{
throw CacheException::forUnableToWrite($this->path);
}
$this->mode = $config->file['mode'] ?? 0640;
$this->prefix = (string) $config->prefix;
}
//--------------------------------------------------------------------
/**
* 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, $this->mode);
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;
}
$newValue = $data['data'] + $offset;
return $this->save($key, $newValue, $data['ttl']) ? $newValue : 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;
}
$newValue = $data['data'] - $offset;
return $this->save($key, $newValue, $data['ttl']) ? $newValue : 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 . $key));
// @phpstan-ignore-next-line
if ($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 $delDir 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 $delDir = false, bool $htdocs = false, int $_level = 0): bool
{
// Trim the trailing slash
$path = rtrim($path, '/\\');
if (! $currentDir = @opendir($path))
{
return false;
}
while (false !== ($filename = @readdir($currentDir)))
{
if ($filename !== '.' && $filename !== '..')
{
if (is_dir($path . DIRECTORY_SEPARATOR . $filename) && $filename[0] !== '.')
{
$this->deleteFiles($path . DIRECTORY_SEPARATOR . $filename, $delDir, $htdocs, $_level + 1);
}
elseif ($htdocs !== true || ! preg_match('/^(\.htaccess|index\.(html|htm|php)|web\.config)$/i', $filename))
{
@unlink($path . DIRECTORY_SEPARATOR . $filename);
}
}
}
closedir($currentDir);
return ($delDir === 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 $sourceDir Path to source
* @param boolean $topLevelOnly 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 $sourceDir, bool $topLevelOnly = true, bool $_recursion = false)
{
static $_filedata = [];
$relativePath = $sourceDir;
if ($fp = @opendir($sourceDir))
{
// reset the array and make sure $source_dir has a trailing slash on the initial call
if ($_recursion === false)
{
$_filedata = [];
$sourceDir = rtrim(realpath($sourceDir) ?: $sourceDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
}
// Used to be foreach (scandir($source_dir, 1) as $file), but scandir() is simply not as fast
while (false !== ($file = readdir($fp)))
{
if (is_dir($sourceDir . $file) && $file[0] !== '.' && $topLevelOnly === false)
{
$this->getDirFileInfo($sourceDir . $file . DIRECTORY_SEPARATOR, $topLevelOnly, true);
}
elseif ($file[0] !== '.')
{
$_filedata[$file] = $this->getFileInfo($sourceDir . $file);
$_filedata[$file]['relative_path'] = $relativePath;
}
}
closedir($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 $returnedValues Array or comma separated string of information returned
*
* @return array|false
*/
protected function getFileInfo(string $file, $returnedValues = ['name', 'server_path', 'size', 'date'])
{
if (! is_file($file))
{
return false;
}
if (is_string($returnedValues))
{
$returnedValues = explode(',', $returnedValues);
}
foreach ($returnedValues 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; // @phpstan-ignore-line
}
//--------------------------------------------------------------------
}
MGatner