SiteBaseRedirectResolver.php

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<?php
declare(strict_types = 1);
namespace ‪TYPO3\CMS\Frontend\Middleware;
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use ‪TYPO3\CMS\Core\Authentication\BackendUserAuthentication;
use ‪TYPO3\CMS\Core\Http\RedirectResponse;
use ‪TYPO3\CMS\Core\Routing\SiteRouteResult;
use ‪TYPO3\CMS\Core\Site\Entity\Site;
use ‪TYPO3\CMS\Core\Site\Entity\SiteLanguage;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Frontend\Controller\ErrorController;
use ‪TYPO3\CMS\Frontend\Page\PageAccessFailureReasons;
 
class ‪SiteBaseRedirectResolver implements MiddlewareInterface
{
    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $site = $request->getAttribute('site', null);
        $language = $request->getAttribute('language', null);
        $routeResult = $request->getAttribute('routing', null);
 
        // Usually called when "https://www.example.com" was entered, but all sites have "https://www.example.com/lang-key/"
        // So a redirect to the first possible language is done.
        if ($site instanceof ‪Site && !($language instanceof ‪SiteLanguage)) {
            if ($routeResult instanceof ‪SiteRouteResult && $routeResult->‪getTail() === '') {
                $language = $site->getDefaultLanguage();
                return new ‪RedirectResponse($language->getBase(), 307);
            }
            return GeneralUtility::makeInstance(ErrorController::class)->pageNotFoundAction(
                $request,
                'The requested page does not exist',
                ['code' => ‪PageAccessFailureReasons::PAGE_NOT_FOUND]
            );
        }
 
        // Language is found, and hidden but also not visible to the BE user, this needs to fail
        if ($language instanceof ‪SiteLanguage && !$this->‪isLanguageEnabled($language, ‪$GLOBALS['BE_USER'] ?? null)) {
            return GeneralUtility::makeInstance(ErrorController::class)->pageNotFoundAction(
                $request,
                'Page is not available in the requested language.',
                ['code' => ‪PageAccessFailureReasons::LANGUAGE_NOT_AVAILABLE]
            );
        }
 
        if ($language instanceof ‪SiteLanguage && $routeResult instanceof ‪SiteRouteResult) {
            $requestedUri = $request->getUri();
            $tail = $routeResult->getTail();
            // a URL was called via "/fr-FR/" but the page is actually called "/fr-FR", let's do a redirect
            if ($tail === '/') {
                $uri = $requestedUri->withPath(rtrim($requestedUri->getPath(), '/'));
                return new ‪RedirectResponse($uri, 307);
            }
        }
        return $handler->handle($request);
    }
    protected function ‪isLanguageEnabled(‪SiteLanguage $language, ‪BackendUserAuthentication $user = null): bool
    {
        // language is hidden, check if a possible backend user is allowed to access the language
        if ($language->‪enabled() || ($user instanceof ‪BackendUserAuthentication && $user->‪checkLanguageAccess($language->‪getLanguageId()))) {
            return true;
        }
        return false;
    }
}