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typo3/sysext/backend/Classes/Middleware/BackendRouteInitialization.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Backend\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\Backend\Routing\Router;
+use TYPO3\CMS\Core\Core\Bootstrap;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Initializes the Backend Router and also loads ext_tables.php from all extensions, as this is the place
+ * where all modules register their routes to the router afterwards.
+ *
+ * The route path is added to the request as attribute "routePath".
+ *
+ * @internal
+ */
+class BackendRouteInitialization implements MiddlewareInterface
+{
+    /**
+     * Resolve the &route (or &M) GET/POST parameter, and also the Router object.
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        // Check if a module URL is requested and deprecate this call
+        $moduleName = $request->getQueryParams()['M'] ?? $request->getParsedBody()['M'] ?? null;
+        // Allow the login page to be displayed if routing is not used and on index.php
+        // (consolidate RouteDispatcher::evaluateReferrer() when changing 'login' to something different)
+        $pathToRoute = $request->getQueryParams()['route'] ?? $request->getParsedBody()['route'] ?? $moduleName ?? '/login';
+
+        if ($moduleName !== null) {
+            // backwards compatibility for old module names
+            // @deprecated since TYPO3 v9, will be removed in TYPO3 v10.0.
+            $router = GeneralUtility::makeInstance(Router::class);
+            foreach ($router->getRoutes() as $routeIdentifier => $route) {
+                if ($routeIdentifier === $moduleName) {
+                    $pathToRoute = $route->getPath();
+                    break;
+                }
+            }
+
+            trigger_error('Calling the TYPO3 Backend with "M" GET parameter will be removed in TYPO3 v10.0,'
+                . ' the calling code calls this script with "&M=' . $moduleName . '" and needs to be adapted'
+                . ' to use the TYPO3 API.', E_USER_DEPRECATED);
+        }
+
+        Bootstrap::initializeBackendRouter();
+        Bootstrap::loadExtTables();
+
+        // Add the route path to the request
+        $request = $request->withAttribute('routePath', $pathToRoute);
+
+        return $handler->handle($request);
+    }
+}