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typo3/sysext/frontend/Classes/Middleware/EidHandler.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\Exception;
+use TYPO3\CMS\Core\Http\Dispatcher;
+use TYPO3\CMS\Core\Http\NullResponse;
+use TYPO3\CMS\Core\Http\Response;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Lightweight alternative to regular frontend requests; used when $_GET[eID] is set.
+ * In the future, logic from the EidUtility will be moved to this class, however in most cases
+ * a custom PSR-15 middleware will be better suited for whatever job the eID functionality does currently.
+ *
+ * @internal
+ */
+class EidHandler implements MiddlewareInterface
+{
+    /**
+     * Dispatches the request to the corresponding eID class or eID script
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     * @throws Exception
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $eID = $request->getParsedBody()['eID'] ?? $request->getQueryParams()['eID'] ?? null;
+
+        if ($eID === null) {
+            return $handler->handle($request);
+        }
+
+        // Remove any output produced until now
+        ob_clean();
+
+        /** @var Response $response */
+        $response = GeneralUtility::makeInstance(Response::class);
+
+        if (empty($eID) || !isset($GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include'][$eID])) {
+            return $response->withStatus(404, 'eID not registered');
+        }
+
+        $configuration = $GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include'][$eID];
+
+        // Simple check to make sure that it's not an absolute file (to use the fallback)
+        if (strpos($configuration, '::') !== false || is_callable($configuration)) {
+            /** @var Dispatcher $dispatcher */
+            $dispatcher = GeneralUtility::makeInstance(Dispatcher::class);
+            $request = $request->withAttribute('target', $configuration);
+            return $dispatcher->dispatch($request, $response) ?? new NullResponse();
+        }
+        trigger_error(
+            'eID "' . $eID . '" is registered with a script to a file. This behaviour will be removed in TYPO3 v10.0.'
+            . ' Register eID with a class::method syntax like "\MyVendor\MyExtension\Controller\MyEidController::myMethod" instead.',
+            E_USER_DEPRECATED
+        );
+        $scriptPath = GeneralUtility::getFileAbsFileName($configuration);
+        if ($scriptPath === '') {
+            throw new Exception('Registered eID has invalid script path.', 1518042216);
+        }
+        include $scriptPath;
+        return new NullResponse();
+    }
+}