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<?php/*** CodeIgniter** An open source application development framework for PHP** This content is released under the MIT License (MIT)** Copyright (c) 2014 - 2016, British Columbia Institute of Technology** 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 EllisLab Dev Team* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)* @license http://opensource.org/licenses/MIT MIT License* @link https://codeigniter.com* @since Version 2.0* @filesource*/defined('BASEPATH') OR exit('No direct script access allowed');/*** CodeIgniter File Caching Class** @package CodeIgniter* @subpackage Libraries* @category Core* @author EllisLab Dev Team* @link*/class CI_Cache_file extends CI_Driver {/*** Directory in which to save cache files** @var string*/protected $_cache_path;/*** Initialize file-based cache** @return void*/public function __construct(){$CI =& get_instance();$CI->load->helper('file');$path = $CI->config->item('cache_path');$this->_cache_path = ($path === '') ? APPPATH.'cache/' : $path;}// ------------------------------------------------------------------------/*** Fetch from cache** @param string $id Cache ID* @return mixed Data on success, FALSE on failure*/public function get($id){$data = $this->_get($id);return is_array($data) ? $data['data'] : FALSE;}// ------------------------------------------------------------------------/*** Save into cache** @param string $id Cache ID* @param mixed $data Data to store* @param int $ttl Time to live in seconds* @param bool $raw Whether to store the raw value (unused)* @return bool TRUE on success, FALSE on failure*/public function save($id, $data, $ttl = 60, $raw = FALSE){$contents = array('time' => time(),'ttl' => $ttl,'data' => $data);if (write_file($this->_cache_path.$id, serialize($contents))){chmod($this->_cache_path.$id, 0640);return TRUE;}return FALSE;}// ------------------------------------------------------------------------/*** Delete from Cache** @param mixed unique identifier of item in cache* @return bool true on success/false on failure*/public function delete($id){return is_file($this->_cache_path.$id) ? unlink($this->_cache_path.$id) : FALSE;}// ------------------------------------------------------------------------/*** Increment a raw value** @param string $id Cache ID* @param int $offset Step/value to add* @return New value on success, FALSE on failure*/public function increment($id, $offset = 1){$data = $this->_get($id);if ($data === FALSE){$data = array('data' => 0, 'ttl' => 60);}elseif ( ! is_int($data['data'])){return FALSE;}$new_value = $data['data'] + $offset;return $this->save($id, $new_value, $data['ttl'])? $new_value: FALSE;}// ------------------------------------------------------------------------/*** Decrement a raw value** @param string $id Cache ID* @param int $offset Step/value to reduce by* @return New value on success, FALSE on failure*/public function decrement($id, $offset = 1){$data = $this->_get($id);if ($data === FALSE){$data = array('data' => 0, 'ttl' => 60);}elseif ( ! is_int($data['data'])){return FALSE;}$new_value = $data['data'] - $offset;return $this->save($id, $new_value, $data['ttl'])? $new_value: FALSE;}// ------------------------------------------------------------------------/*** Clean the Cache** @return bool false on failure/true on success*/public function clean(){return delete_files($this->_cache_path, FALSE, TRUE);}// ------------------------------------------------------------------------/*** Cache Info** Not supported by file-based caching** @param string user/filehits* @return mixed FALSE*/public function cache_info($type = NULL){return get_dir_file_info($this->_cache_path);}// ------------------------------------------------------------------------/*** Get Cache Metadata** @param mixed key to get cache metadata on* @return mixed FALSE on failure, array on success.*/public function get_metadata($id){if ( ! is_file($this->_cache_path.$id)){return FALSE;}$data = unserialize(file_get_contents($this->_cache_path.$id));if (is_array($data)){$mtime = filemtime($this->_cache_path.$id);if ( ! isset($data['ttl'], $data['time'])){return FALSE;}return array('expire' => $data['time'] + $data['ttl'],'mtime' => $mtime);}return FALSE;}// ------------------------------------------------------------------------/*** Is supported** In the file driver, check to see that the cache directory is indeed writable** @return bool*/public function is_supported(){return is_really_writable($this->_cache_path);}// ------------------------------------------------------------------------/*** Get all data** Internal method to get all the relevant data about a cache item** @param string $id Cache ID* @return mixed Data array on success or FALSE on failure*/protected function _get($id){if ( ! is_file($this->_cache_path.$id)){return FALSE;}$data = unserialize(file_get_contents($this->_cache_path.$id));if ($data['ttl'] > 0 && time() > $data['time'] + $data['ttl']){unlink($this->_cache_path.$id);return FALSE;}return $data;}}