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Editing: redirect.php

<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  System.redirect
 *
 * @copyright   (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Event\ErrorEvent;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Router\Route;
use Joomla\CMS\Uri\Uri;
use Joomla\Database\DatabaseInterface;
use Joomla\Database\ParameterType;
use Joomla\Event\SubscriberInterface;
use Joomla\String\StringHelper;

/**
 * Plugin class for redirect handling.
 *
 * @since  1.6
 */
class PlgSystemRedirect extends CMSPlugin implements SubscriberInterface
{
	/**
	 * Affects constructor behavior. If true, language files will be loaded automatically.
	 *
	 * @var    boolean
	 * @since  3.4
	 */
	protected $autoloadLanguage = false;

/**
	 * Database object.
	 *
	 * @var    DatabaseInterface
	 * @since  4.0.0
	 */
	protected $db;

/**
	 * Returns an array of events this subscriber will listen to.
	 *
	 * @return  array
	 *
	 * @since   4.0.0
	 */
	public static function getSubscribedEvents(): array
	{
		return [
			'onError' => 'handleError',
		];
	}

/**
	 * Internal processor for all error handlers
	 *
	 * @param   ErrorEvent  $event  The event object
	 *
	 * @return  void
	 *
	 * @since   3.5
	 */
	public function handleError(ErrorEvent $event)
	{
		/** @var \Joomla\CMS\Application\CMSApplication $app */
		$app = $event->getApplication();

if ($app->isClient('administrator') || ((int) $event->getError()->getCode() !== 404))
		{
			return;
		}

$uri = Uri::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(Uri::root(), '', $orgurl);

// For when users have added / to the url
		$orgurlRootRelSlash    = str_replace(Uri::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(Uri::root(), '', $url);

// For when users have added / to the url
		$urlRootRelSlash    = str_replace(Uri::root(), '/', $url);
		$urlWithoutQuery    = StringHelper::strtolower(rawurldecode($uri->toString(array('scheme', 'host', 'port', 'path', 'fragment'))));
		$urlRelWithoutQuery = StringHelper::strtolower(rawurldecode($uri->toString(array('path', 'fragment'))));

$excludes = (array) $this->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?
		 * Because hackers still try urls with mosConfig_* and Url Injection with =http[s]:// and we dont want to log/redirect these requests
		 */
		if ($skipUrl || (strpos($url, 'mosConfig_') !== false) || (strpos($url, '=http') !== false))
		{
			return;
		}

$query = $this->db->getQuery(true);

$query->select('*')
			->from($this->db->quoteName('#__redirect_links'))
			->whereIn(
				$this->db->quoteName('old_url'),
				[
					$url,
					$urlRel,
					$urlRootRel,
					$urlRootRelSlash,
					$urlWithoutQuery,
					$urlRelWithoutQuery,
					$orgurl,
					$orgurlRel,
					$orgurlRootRel,
					$orgurlRootRelSlash,
					$orgurlWithoutQuery,
					$orgurlRelWithoutQuery,
				],
				ParameterType::STRING
			);

$this->db->setQuery($query);

$redirect = null;

try
		{
			$redirects = $this->db->loadAssocList();
		}
		catch (Exception $e)
		{
			$event->setError(new Exception(Text::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));

return;
		}

$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) ComponentHelper::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;
				}

$dest = Uri::isInternal($redirect->new_url) || strpos($redirect->new_url, 'http') === false ?
					Route::_($redirect->new_url) : $redirect->new_url;

// In case the url contains double // lets remove it
				$destination = str_replace(Uri::root() . '/', Uri::root(), $dest);

$app->redirect($destination, (int) $redirect->header);
			}

$event->setError(new RuntimeException($event->getError()->getMessage(), $redirect->header, $event->getError()));
		}
		// No redirect object was found so we create an entry in the redirect table
		elseif ($redirect === null)
		{
			if ((bool) $this->params->get('collect_urls', 1))
			{
				if (!$this->params->get('includeUrl', 1))
				{
					$url = $urlRel;
				}

$nowDate = Factory::getDate()->toSql();

$data = (object) array(
					'id' => 0,
					'old_url' => $url,
					'referer' => $app->input->server->getString('HTTP_REFERER', ''),
					'hits' => 1,
					'published' => 0,
					'created_date' => $nowDate,
					'modified_date' => $nowDate,
				);

try
				{
					$this->db->insertObject('#__redirect_links', $data, 'id');
				}
				catch (Exception $e)
				{
					$event->setError(new Exception(Text::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));

return;
				}
			}
		}
		// We have an unpublished redirect object, increment the hit counter
		else
		{
			$redirect->hits++;

try
			{
				$this->db->updateObject('#__redirect_links', $redirect, ['id']);
			}
			catch (Exception $e)
			{
				$event->setError(new Exception(Text::_('PLG_SYSTEM_REDIRECT_ERROR_UPDATING_DATABASE'), 500, $e));

return;
			}
		}
	}
}

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