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   1  <?php
   2  /**
   3   * @copyright    Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
   4   * @license        GNU General Public License version 2 or later; see LICENSE.txt
   5   */
   6  
   7  defined('JPATH_BASE') or die;
   8  
   9  /**
  10   * Plugin class for redirect handling.
  11   *
  12   * @package        Joomla.Plugin
  13   * @subpackage    System.redirect
  14   */
  15  class plgSystemRedirect extends JPlugin
  16  {
  17      /**
  18       * Object Constructor.
  19       *
  20       * @access    public
  21       * @param    object    The object to observe -- event dispatcher.
  22       * @param    object    The configuration object for the plugin.
  23       * @return    void
  24       * @since    1.0
  25       */
  26  	function __construct(&$subject, $config)
  27      {
  28          parent::__construct($subject, $config);
  29  
  30          // Set the error handler for E_ERROR to be the class handleError method.
  31          JError::setErrorHandling(E_ERROR, 'callback', array('plgSystemRedirect', 'handleError'));
  32      }
  33  
  34  	static function handleError(&$error)
  35      {
  36          // Get the application object.
  37          $app = JFactory::getApplication();
  38  
  39          // Make sure the error is a 404 and we are not in the administrator.
  40          if (!$app->isAdmin() and ($error->getCode() == 404))
  41          {
  42              // Get the full current URI.
  43              $uri = JURI::getInstance();
  44              $current = $uri->toString(array('scheme', 'host', 'port', 'path', 'query', 'fragment'));
  45  
  46              // Attempt to ignore idiots.
  47              if ((strpos($current, 'mosConfig_') !== false) || (strpos($current, '=http://') !== false)) {
  48                  // Render the error page.
  49                  JError::customErrorPage($error);
  50              }
  51  
  52              // See if the current url exists in the database as a redirect.
  53              $db = JFactory::getDBO();
  54                  $db->setQuery(
  55                  'SELECT '.$db->quoteName('new_url').', '.$db->quoteName('published').
  56                  ' FROM '.$db->quoteName('#__redirect_links') .
  57                  ' WHERE '.$db->quoteName('old_url').' = '.$db->quote($current),
  58                  0, 1
  59              );
  60              $link = $db->loadObject();
  61  
  62              // If a redirect exists and is published, permanently redirect.
  63              if ($link and ($link->published == 1)) {
  64                  $app->redirect($link->new_url, null, null, true, true);
  65              }
  66              else
  67              {
  68                  $referer = empty($_SERVER['HTTP_REFERER']) ? '' : $_SERVER['HTTP_REFERER'];
  69  
  70                  $db->setQuery('SELECT id FROM ' . $db->quoteName('#__redirect_links') . '  WHERE old_url= ' . $db->quote($current));
  71                  $res = $db->loadResult();
  72                  if(!$res) {
  73  
  74                      // If not, add the new url to the database.
  75                       $query = $db->getQuery(true);
  76                       $query->insert($db->quoteName('#__redirect_links'), false);
  77                       $columns = array( $db->quoteName('old_url'),
  78                                      $db->quoteName('new_url'),
  79                                      $db->quoteName('referer'),
  80                                      $db->quoteName('comment'),
  81                                      $db->quoteName('published'),
  82                                      $db->quoteName('created_date')
  83                                  );
  84                      $query->columns($columns);
  85                      $query->values($db->Quote($current). ', '. $db->Quote('').
  86                                    ' ,'.$db->Quote($referer).', '.$db->Quote('').',0, '.
  87                                    $db->Quote(JFactory::getDate()->toSql())
  88                                  );
  89  
  90                      $db->setQuery($query);
  91                      $db->query();
  92  
  93                  }
  94                  // Render the error page.
  95                  JError::customErrorPage($error);
  96              }
  97          }
  98          else {
  99              // Render the error page.
 100              JError::customErrorPage($error);
 101          }
 102      }
 103  }