redirect.php
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<?php
/**
* @package Joomla.Plugin
* @subpackage System.redirect
*
* @copyright Copyright (C) 2005 - 2019 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;
use Joomla\String\StringHelper;
/**
* 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;
/**
* The global exception handler registered before the plugin was instantiated
*
* @var callable
* @since 3.6
*/
private static $previousExceptionHandler;
/**
* Constructor.
*
* @param object &$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, $config);
// Set the JError handler for E_ERROR to be the class' handleError method.
JError::setErrorHandling(E_ERROR, 'callback', array('PlgSystemRedirect', 'handleError'));
// Register the previously defined exception handler so we can forward errors to it
self::$previousExceptionHandler = set_exception_handler(array('PlgSystemRedirect', 'handleException'));
}
/**
* Method to handle an error condition from JError.
*
* @param JException $error The JException object to be handled.
*
* @return void
*
* @since 1.6
*/
public static function handleError(JException $error)
{
self::doErrorHandling($error);
}
/**
* Method to handle an uncaught exception.
*
* @param Exception|Throwable $exception The Exception or Throwable object to be handled.
*
* @return void
*
* @since 3.5
* @throws InvalidArgumentException
*/
public static function handleException($exception)
{
// If this isn't a Throwable then bail out
if (!($exception instanceof Throwable) && !($exception instanceof Exception))
{
throw new InvalidArgumentException(
sprintf('The error handler requires an Exception or Throwable object, a "%s" object was given instead.', get_class($exception))
);
}
self::doErrorHandling($exception);
}
/**
* Internal processor for all error handlers
*
* @param Exception|Throwable $error The Exception or Throwable object to be handled.
*
* @return void
*
* @since 3.5
*/
private static function doErrorHandling($error)
{
$app = JFactory::getApplication();
if ($app->isClient('administrator') || ((int) $error->getCode() !== 404))
{
// Proxy to the previous exception handler if available, otherwise just render the error page
if (self::$previousExceptionHandler)
{
call_user_func_array(self::$previousExceptionHandler, array($error));
}
else
{
JErrorPage::render($error);
}
}
$uri = JUri::getInstance();
// These are the original URLs
$orgurl = rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'query', 'fragment')));
$orgurlRel = rawurldecode($uri->toString(array('path', 'query', 'fragment')));
// The above doesn't work for sub directories, so do this
$orgurlRootRel = str_replace(JUri::root(), '', $orgurl);
// For when users have added / to the url
$orgurlRootRelSlash = str_replace(JUri::root(), '/', $orgurl);
$orgurlWithoutQuery = rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'fragment')));
$orgurlRelWithoutQuery = rawurldecode($uri->toString(array('path', 'fragment')));
// These are the URLs we save and use
$url = StringHelper::strtolower(rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'query', 'fragment'))));
$urlRel = StringHelper::strtolower(rawurldecode($uri->toString(array('path', 'query', 'fragment'))));
// The above doesn't work for sub directories, so do this
$urlRootRel = str_replace(JUri::root(), '', $url);
// For when users have added / to the url
$urlRootRelSlash = str_replace(JUri::root(), '/', $url);
$urlWithoutQuery = StringHelper::strtolower(rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'fragment'))));
$urlRelWithoutQuery = StringHelper::strtolower(rawurldecode($uri->toString(array('path', 'fragment'))));
$plugin = JPluginHelper::getPlugin('system', 'redirect');
$params = new Registry($plugin->params);
$excludes = (array) $params->get('exclude_urls');
$skipUrl = false;
foreach ($excludes as $exclude)
{
if (empty($exclude->term))
{
continue;
}
if (!empty($exclude->regexp))
{
// Only check $url, because it includes all other sub urls
if (preg_match('/' . $exclude->term . '/i', $orgurlRel))
{
$skipUrl = true;
break;
}
}
else
{
if (StringHelper::strpos($orgurlRel, $exclude->term) !== false)
{
$skipUrl = true;
break;
}
}
}
// Why is this (still) here?
if ($skipUrl || (strpos($url, 'mosConfig_') !== false) || (strpos($url, '=http://') !== false))
{
JErrorPage::render($error);
}
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select('*')
->from($db->quoteName('#__redirect_links'))
->where(
'('
. $db->quoteName('old_url') . ' = ' . $db->quote($url)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($urlRel)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($urlRootRel)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($urlRootRelSlash)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($urlWithoutQuery)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($urlRelWithoutQuery)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurl)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurlRel)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurlRootRel)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurlRootRelSlash)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurlWithoutQuery)
. ' OR '
. $db->quoteName('old_url') . ' = ' . $db->quote($orgurlRelWithoutQuery)
. ')'
);
$db->setQuery($query);
$redirect = null;
try
{
$redirects = $db->loadAssocList();
}
catch (Exception $e)
{
JErrorPage::render(new Exception(JText::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));
}
$possibleMatches = array_unique(
array(
$url,
$urlRel,
$urlRootRel,
$urlRootRelSlash,
$urlWithoutQuery,
$urlRelWithoutQuery,
$orgurl,
$orgurlRel,
$orgurlRootRel,
$orgurlRootRelSlash,
$orgurlWithoutQuery,
$orgurlRelWithoutQuery,
)
);
foreach ($possibleMatches as $match)
{
if (($index = array_search($match, array_column($redirects, 'old_url'))) !== false)
{
$redirect = (object) $redirects[$index];
if ((int) $redirect->published === 1)
{
break;
}
}
}
// A redirect object was found and, if published, will be used
if ($redirect !== null && ((int) $redirect->published === 1))
{
if (!$redirect->header || (bool) JComponentHelper::getParams('com_redirect')->get('mode', false) === false)
{
$redirect->header = 301;
}
if ($redirect->header < 400 && $redirect->header >= 300)
{
$urlQuery = $uri->getQuery();
$oldUrlParts = parse_url($redirect->old_url);
if ($urlQuery !== '' && empty($oldUrlParts['query']))
{
$redirect->new_url .= '?' . $urlQuery;
}
$dest = JUri::isInternal($redirect->new_url) || strpos($redirect->new_url, 'http') === false ?
JRoute::_($redirect->new_url) : $redirect->new_url;
// In case the url contains double // lets remove it
$destination = str_replace(JUri::root() . '/', JUri::root(), $dest);
$app->redirect($destination, (int) $redirect->header);
}
JErrorPage::render(new RuntimeException($error->getMessage(), $redirect->header, $error));
}
// No redirect object was found so we create an entry in the redirect table
elseif ($redirect === null)
{
$params = new Registry(JPluginHelper::getPlugin('system', 'redirect')->params);
if ((bool) $params->get('collect_urls', 1))
{
if (!$params->get('includeUrl', 1))
{
$url = $urlRel;
}
$data = (object) array(
'id' => 0,
'old_url' => $url,
'referer' => $app->input->server->getString('HTTP_REFERER', ''),
'hits' => 1,
'published' => 0,
'created_date' => JFactory::getDate()->toSql()
);
try
{
$db->insertObject('#__redirect_links', $data, 'id');
}
catch (Exception $e)
{
JErrorPage::render(new Exception(JText::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));
}
}
}
// We have an unpublished redirect object, increment the hit counter
else
{
$redirect->hits++;
try
{
$db->updateObject('#__redirect_links', $redirect, 'id');
}
catch (Exception $e)
{
JErrorPage::render(new Exception(JText::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));
}
}
// Proxy to the previous exception handler if available, otherwise just render the error page
if (self::$previousExceptionHandler)
{
call_user_func_array(self::$previousExceptionHandler, array($error));
}
else
{
JErrorPage::render($error);
}
}
}