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   1  <?php
   2  /**
   3  * @version        $Id: cache.php 14401 2010-01-26 14:10:00Z louis $
   4  * @package        Joomla
   5  * @copyright    Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
   6  * @license        GNU/GPL, see LICENSE.php
   7  * Joomla! is free software. This version may have been modified pursuant
   8  * to the GNU General Public License, and as distributed it includes or
   9  * is derivative of works licensed under the GNU General Public License or
  10  * other free or open source software licenses.
  11  * See COPYRIGHT.php for copyright notices and details.
  12  */
  13  
  14  // no direct access
  15  defined( '_JEXEC' ) or die( 'Restricted access' );
  16  
  17  jimport( 'joomla.plugin.plugin' );
  18  
  19  /**
  20   * Joomla! Page Cache Plugin
  21   *
  22   * @package        Joomla
  23   * @subpackage    System
  24   */
  25  class  plgSystemCache extends JPlugin
  26  {
  27  
  28      var $_cache = null;
  29  
  30      /**
  31       * Constructor
  32       *
  33       * For php4 compatability we must not use the __constructor as a constructor for plugins
  34       * because func_get_args ( void ) returns a copy of all passed arguments NOT references.
  35       * This causes problems with cross-referencing necessary for the observer design pattern.
  36       *
  37       * @access    protected
  38       * @param    object    $subject The object to observe
  39       * @param     array   $config  An array that holds the plugin configuration
  40       * @since    1.0
  41       */
  42  	function plgSystemCache(& $subject, $config)
  43      {
  44          parent::__construct($subject, $config);
  45  
  46          //Set the language in the class
  47          $config =& JFactory::getConfig();
  48          $options = array(
  49              'cachebase'     => JPATH_BASE.DS.'cache',
  50              'defaultgroup'     => 'page',
  51              'lifetime'         => $this->params->get('cachetime', 15) * 60,
  52              'browsercache'    => $this->params->get('browsercache', false),
  53              'caching'        => false,
  54              'language'        => $config->getValue('config.language', 'en-GB')
  55          );
  56  
  57          jimport('joomla.cache.cache');
  58          $this->_cache =& JCache::getInstance( 'page', $options );
  59      }
  60  
  61      /**
  62      * Converting the site URL to fit to the HTTP request
  63      *
  64      */
  65  	function onAfterInitialise()
  66      {
  67          global $mainframe, $_PROFILER;
  68          $user = &JFactory::getUser();
  69  
  70          if($mainframe->isAdmin() || JDEBUG) {
  71              return;
  72          }
  73  
  74          if (!$user->get('aid') && $_SERVER['REQUEST_METHOD'] == 'GET') {
  75              $this->_cache->setCaching(true);
  76          }
  77  
  78          $data  = $this->_cache->get();
  79  
  80          if($data !== false)
  81          {
  82              // the following code searches for a token in the cached page and replaces it with the
  83              // proper token.
  84              $token    = JUtility::getToken();
  85              $search = '#<input type="hidden" name="[0-9a-f]{32}" value="1" />#';
  86              $replacement = '<input type="hidden" name="'.$token.'" value="1" />';
  87              $data = preg_replace( $search, $replacement, $data );
  88  
  89              JResponse::setBody($data);
  90  
  91              echo JResponse::toString($mainframe->getCfg('gzip'));
  92  
  93              if(JDEBUG)
  94              {
  95                  $_PROFILER->mark('afterCache');
  96                  echo implode( '', $_PROFILER->getBuffer());
  97              }
  98  
  99              $mainframe->close();
 100          }
 101      }
 102  
 103  	function onAfterRender()
 104      {
 105          global $mainframe;
 106  
 107          if($mainframe->isAdmin() || JDEBUG) {
 108              return;
 109          }
 110  
 111          $user =& JFactory::getUser();
 112          if(!$user->get('aid')) {
 113              //We need to check again here, because auto-login plugins have not been fired before the first aid check
 114              $this->_cache->store();
 115          }
 116      }
 117  }