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<?php
/**
* @package Joomla.Plugin
* @subpackage System.redirect
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
use Joomla\Registry\Registry;
/**
* Plugin class for redirect handling.
*
* @since 1.6
*/
class PlgSystemRedirect extends JPlugin
{
/**
* Affects constructor behavior. If true, language files will be loaded automatically.
*
* @var boolean
* @since 3.4
*/
protected $autoloadLanguage = false;
/**
* Constructor.
*
* @param object &$subject The object to observe
* @param array $config An optional associative array of configuration settings.
*
* @since 1.6
*/
public function __construct(&$subject, $config)
{
parent::__construct($subject, $config);
// Set the error handler for E_ERROR to be the class handleError method.
JError::setErrorHandling(E_ERROR, 'callback', array('PlgSystemRedirect', 'handleError'));
set_exception_handler(array('PlgSystemRedirect', 'handleError'));
}
/**
* Method to handle an error condition.
*
* @param Exception &$error The Exception object to be handled.
*
* @return void
*
* @since 1.6
*/
public static function handleError(&$error)
{
// Get the application object.
$app = JFactory::getApplication();
// Make sure the error is a 404 and we are not in the administrator.
if ($app->isAdmin() || $error->getCode() != 404)
{
// Render the error page.
JError::customErrorPage($error);
}
// Get the full current URI.
$uri = JUri::getInstance();
$current = rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'query', 'fragment')));
// Attempt to ignore idiots.
if ((strpos($current, 'mosConfig_') !== false) || (strpos($current, '=http://') !== false))
{
// Render the error page.
JError::customErrorPage($error);
}
// See if the current url exists in the database as a redirect.
$db = JFactory::getDbo();
$query = $db->getQuery(true)
->select($db->quoteName(array('new_url', 'header')))
->select($db->quoteName('published'))
->from($db->quoteName('#__redirect_links'))
->where($db->quoteName('old_url') . ' = ' . $db->quote($current));
$db->setQuery($query, 0, 1);
$link = $db->loadObject();
// If no published redirect was found try with the server-relative URL
if (!$link or ($link->published != 1))
{
$currRel = rawurldecode($uri->toString(array('path', 'query', 'fragment')));
$query = $db->getQuery(true)
->select($db->quoteName('new_url'))
->select($db->quoteName('published'))
->from($db->quoteName('#__redirect_links'))
->where($db->quoteName('old_url') . ' = ' . $db->quote($currRel));
$db->setQuery($query, 0, 1);
$link = $db->loadObject();
}
// If a redirect exists and is published, permanently redirect.
if ($link and ($link->published == 1))
{
// If no header is set use a 301 permanent redirect
if (!$link->header || JComponentHelper::getParams('com_redirect')->get('mode', 0) == false)
{
$link->header = 301;
}
// If we have a redirect in the 300 range use JApplicationWeb::redirect().
if ($link->header < 400 && $link->header >= 300)
{
$new_link = JUri::isInternal($link->new_url) ? JRoute::_($link->new_url) : $link->new_url;
$app->redirect($new_link, intval($link->header));
}
else
{
// Else rethrow the exeception with the new header and return
try
{
throw new RuntimeException($error->getMessage(), $link->header, $error);
}
catch (Exception $e)
{
$newError = $e;
}
JError::customErrorPage($newError);
}
}
else
{
try
{
$referer = empty($_SERVER['HTTP_REFERER']) ? '' : $_SERVER['HTTP_REFERER'];
$query = $db->getQuery(true)
->select($db->quoteName('id'))
->from($db->quoteName('#__redirect_links'))
->where($db->quoteName('old_url') . ' = ' . $db->quote($current));
$db->setQuery($query);
$res = $db->loadResult();
if (!$res)
{
// If not, add the new url to the database but only if option is enabled
$params = new Registry(JPluginHelper::getPlugin('system', 'redirect')->params);
$collect_urls = $params->get('collect_urls', 1);
if ($collect_urls == true)
{
$columns = array(
$db->quoteName('old_url'),
$db->quoteName('new_url'),
$db->quoteName('referer'),
$db->quoteName('comment'),
$db->quoteName('hits'),
$db->quoteName('published'),
$db->quoteName('created_date')
);
$query->clear()
->insert($db->quoteName('#__redirect_links'), false)
->columns($columns)
->values(
$db->quote($current) . ', ' . $db->quote('') .
' ,' . $db->quote($referer) . ', ' . $db->quote('') . ',1,0, ' .
$db->quote(JFactory::getDate()->toSql())
);
$db->setQuery($query);
$db->execute();
}
}
else
{
// Existing error url, increase hit counter.
$query->clear()
->update($db->quoteName('#__redirect_links'))
->set($db->quoteName('hits') . ' = ' . $db->quoteName('hits') . ' + 1')
->where('id = ' . (int) $res);
$db->setQuery($query);
$db->execute();
}
}
catch (RuntimeException $exception)
{
JError::customErrorPage(new Exception(JText::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 404));
}
// Render the error page.
JError::customErrorPage($error);
}
}
}