first commit

typo3/sysext/frontend/Classes/Middleware/SiteResolver.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\Routing\SiteMatcher;
+use TYPO3\CMS\Core\Routing\SiteRouteResult;
+use TYPO3\CMS\Core\Site\SiteFinder;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Identifies if a site is configured for the request, based on "id" and "L" GET/POST parameters, or the requested
+ * string.
+ *
+ * If a site is found, the request is populated with the found language+site objects. If none is found, the main magic
+ * is handled by the PageResolver middleware.
+ */
+class SiteResolver implements MiddlewareInterface
+{
+    /**
+     * @var SiteMatcher
+     */
+    protected $matcher;
+
+    public function __construct(SiteMatcher $matcher = null)
+    {
+        $this->matcher = $matcher ?? GeneralUtility::makeInstance(
+            SiteMatcher::class,
+            GeneralUtility::makeInstance(SiteFinder::class)
+        );
+    }
+
+    /**
+     * Resolve the site/language information by checking the page ID or the URL.
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        /** @var SiteRouteResult $routeResult */
+        $routeResult = $this->matcher->matchRequest($request);
+        $request = $request->withAttribute('site', $routeResult->getSite());
+        $request = $request->withAttribute('language', $routeResult->getLanguage());
+        $request = $request->withAttribute('routing', $routeResult);
+
+        // At this point, we later get further route modifiers
+        // for bw-compat we update $GLOBALS[TYPO3_REQUEST] to be used later in TSFE.
+        $GLOBALS['TYPO3_REQUEST'] = $request;
+
+        return $handler->handle($request);
+    }
+}