includes/cache.php
author Dan
Mon, 29 Sep 2008 08:24:26 -0400
changeset 712 331e009416d5
parent 685 17ebe24cdf85
child 801 eb8b23f11744
permissions -rw-r--r--
SECURITY: Changed Diffie-Hellman parameters to prime and generator created through OpenSSL
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.1.5 (Caoineag alpha 5)
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 * Copyright (C) 2006-2008 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Framework for caching arbitrary data around the site.
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 * @package Enano
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 * @subpackage Core
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 * @author Dan Fuhry <dan@enanocms.org>
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 * @license GNU General Public License
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 */
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class CacheManager
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{
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  /**
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   * Fetch a cached piece of data.
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   * @param string Cache ID. The timestamp is checked automatically.
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   */
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  public function fetch($cache_id)
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  {
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
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    if ( file_exists($cache_file) )
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    {
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      require($cache_file);
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      if ( isset($_cache_data) && isset($_cache_ttl) && isset($_cache_timestamp) )
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      {
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        $cache_expire = $_cache_timestamp + ( 60 * $_cache_ttl);
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        if ( $cache_expire >= time() || $_cache_ttl === -1 )
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        {
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          return $_cache_data;
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        }
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      }
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    }
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    return false;
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  }
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  /**
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   * Stores an array by var_export()ing it and saving it to disk.
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   * @param string Cache ID - human readable name for this store (letters, numbers, underscores)
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   * @param array Data to store
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   * @param int TTL for the cached array, in minutes. Defaults to 20. If set to -1, caches indefinitely.
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   * @return bool True on success, false on failure
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   */
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  public function store($cache_id, $data, $ttl = 20)
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  {
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    if ( getConfig('cache_thumbs') != '1' )
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    {
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      // caching disabled
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      return false;
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    }
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    if ( !is_int($ttl) )
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    {
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      throw new Exception('TTL must be an integer');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
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    if ( file_exists($cache_file) )
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    {
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      @unlink($cache_file);
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    }
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    $fh = @fopen($cache_file, 'w');
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    if ( !$fh )
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    {
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      throw new Exception('Failed to open file for writing.');
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    }
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    $exported = Language::var_export_string($data);
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    $now = time();
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    $content = <<<EOF
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<?php
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/**
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 * Automatically generated cache file.
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 * Do not edit this file as it will expire and be overwritten $ttl minutes from its creation.
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 */
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\$_cache_ttl = $ttl;
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\$_cache_timestamp = $now;
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\$_cache_data = $exported;
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EOF;
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    fwrite($fh, $content);
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    fclose($fh);
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    return true;
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  }
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  /**
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   * Deletes a cached item.
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   * @param string Cache ID.
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   * @return bool true on success or if item doesn't exist, false on failure
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   */
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  public function purge($cache_id)
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  {
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
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    if ( file_exists($cache_file) )
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    {
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      if ( unlink($cache_file) )
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      {
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        return true;
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      }
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      return false;
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    }
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    return true;
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  }
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}
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