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typo3/sysext/backend/Classes/Http/RequestHandler.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Backend\Http;
+
+/*
+ * 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\RequestHandlerInterface as PsrRequestHandlerInterface;
+use TYPO3\CMS\Backend\Routing\Exception\InvalidRequestTokenException;
+use TYPO3\CMS\Core\Http\RedirectResponse;
+use TYPO3\CMS\Core\Http\RequestHandlerInterface;
+use TYPO3\CMS\Core\Http\Response;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * General RequestHandler for the TYPO3 Backend. This is used for all Backend requests, including AJAX routes.
+ *
+ * If a get/post parameter "route" is set, the Backend Routing is called and searches for a
+ * matching route inside the Router. The corresponding controller / action is called then which returns the response.
+ *
+ * The following get/post parameters are evaluated here:
+ *   - route
+ *   - token
+ */
+class RequestHandler implements RequestHandlerInterface, PsrRequestHandlerInterface
+{
+    /**
+     * Handles any backend request
+     *
+     * @param ServerRequestInterface $request
+     * @return ResponseInterface
+     */
+    public function handleRequest(ServerRequestInterface $request): ResponseInterface
+    {
+        return $this->handle($request);
+    }
+
+    /**
+     * Handles a backend request, after finishing running middlewares
+     * Dispatch the request to the appropriate controller through the
+     * Backend Dispatcher which resolves the routing
+     *
+     * @param ServerRequestInterface $request
+     * @return ResponseInterface
+     */
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        // Use a custom pre-created response for AJAX calls
+        // @deprecated since TYPO3 v9, will be removed in TYPO3 v10.0: No prepared $response to RouteDispatcher any longer
+        if (TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_AJAX) {
+            $response = new Response('php://temp', 200, [
+                'Content-Type' => 'application/json; charset=utf-8',
+                'X-JSON' => 'true'
+            ]);
+        } else {
+            $response = new Response();
+        }
+        try {
+            // Check if the router has the available route and dispatch.
+            $dispatcher = GeneralUtility::makeInstance(RouteDispatcher::class);
+            return $dispatcher->dispatch($request, $response);
+        } catch (InvalidRequestTokenException $e) {
+            // When token was invalid redirect to login
+            $url = GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . TYPO3_mainDir;
+            return new RedirectResponse($url);
+        }
+    }
+
+    /**
+     * This request handler can handle any backend request.
+     *
+     * @param ServerRequestInterface $request
+     * @return bool If the request is BE request TRUE otherwise FALSE
+     */
+    public function canHandleRequest(ServerRequestInterface $request): bool
+    {
+        return (bool)(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_BE);
+    }
+
+    /**
+     * Returns the priority - how eager the handler is to actually handle the
+     * request.
+     *
+     * @return int The priority of the request handler.
+     */
+    public function getPriority(): int
+    {
+        return 50;
+    }
+}