[TASK] Refactor dispatcher and middleware

Move rendering related code from dispatcher to
content object and change middleware to configure
TSFE to call our content object during rendering.

Remove obsolete classes and files, as we now correctly
interface with the middleware stack and TYPO3 frontend rendering.

Author: helhum

Classes/ContentObject/TypoScriptRenderingContentObject.php

@@ -0,0 +1,88 @@
+<?php
+namespace Helhum\TyposcriptRendering\ContentObject;
+
+/*
+ * This file is part of the TypoScript Rendering TYPO3 extension.
+ *
+ * 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
+ * LICENSE file that was distributed with this source code.
+ *
+ */
+
+use Helhum\TyposcriptRendering\Exception;
+use Helhum\TyposcriptRendering\Mvc\Request;
+use Helhum\TyposcriptRendering\Mvc\RequestBuilder;
+use Helhum\TyposcriptRendering\Mvc\Response;
+use Helhum\TyposcriptRendering\Renderer\RenderingContext;
+use Helhum\TyposcriptRendering\Renderer\RenderingInterface;
+use TYPO3\CMS\Frontend\ContentObject\AbstractContentObject;
+use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
+
+class TypoScriptRenderingContentObject extends AbstractContentObject
+{
+    /**
+     * @var RequestBuilder
+     */
+    private $requestBuilder;
+
+    /**
+     * @var string[]
+     */
+    private $renderer;
+
+    /**
+     * @param RequestBuilder $requestBuilder
+     * @param string[] $renderer
+     */
+    public function __construct(ContentObjectRenderer $cObj, RequestBuilder $requestBuilder = null, array $renderer = null)
+    {
+        parent::__construct($cObj);
+        $this->requestBuilder = $requestBuilder ?: new RequestBuilder();
+        $this->renderer = $renderer ?: $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['typoscript_rendering']['renderClasses'];
+    }
+
+    public function render($conf = []): string
+    {
+        $renderingRequest = $this->requestBuilder->build($conf['request']);
+        $response = new Response();
+
+        $renderer = $this->resolveRenderer($renderingRequest);
+        $renderingContext = new RenderingContext($GLOBALS['TSFE']);
+        $renderer->renderRequest($renderingRequest, $response, $renderingContext);
+
+        return $response->getContent();
+    }
+
+    /**
+     * @param Request $request
+     *
+     * @throws Exception
+     * @return RenderingInterface
+     *
+     */
+    protected function resolveRenderer(Request $request)
+    {
+        if ($request->hasArgument('renderer') && isset($this->renderer[$request->getArgument('renderer')])) {
+            $rendererClassName = $this->renderer[$request->getArgument('renderer')];
+            /** @var RenderingInterface $renderer */
+            $renderer = new $rendererClassName();
+            if ($renderer->canRender($request)) {
+                return $renderer;
+            }
+        }
+
+        foreach ($this->renderer as $rendererClassName) {
+            /** @var RenderingInterface $renderer */
+            $renderer = new $rendererClassName();
+            if ($renderer->canRender($request)) {
+                return $renderer;
+            }
+        }
+
+        throw new Exception('No renderer found for this request!', 1403628294);
+    }
+}

Classes/Core/FrontendRenderingProvisioner.php

@@ -0,0 +1,73 @@
+<?php
+namespace Helhum\TyposcriptRendering\Middleware;
+
+/*
+ * This file is part of the TypoScript Rendering TYPO3 extension.
+ *
+ * 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
+ * LICENSE file that was distributed with this source code.
+ *
+ */
+
+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;
+
+/**
+ * Lightweight alternative to regular frontend requests based on typoscript_rendering extensions; used when $_GET[tx_typoscriptrendering] is set.
+ */
+class TypoScriptRenderingMiddleware implements MiddlewareInterface
+{
+    private const argumentNamespace = 'tx_typoscriptrendering';
+
+    /**
+     * Dispatches the request to the corresponding typoscript_rendering configuration
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @throws Exception
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $frontendController = $GLOBALS['TSFE'];
+        if (!$frontendController->isGeneratePage() || !isset($request->getQueryParams()[self::argumentNamespace])) {
+            return $handler->handle($request);
+        }
+        $this->ensureRequiredEnvironment();
+
+        $frontendController->config['config']['disableAllHeaderCode'] = 1;
+        $frontendController->pSetup = [
+            '10' => 'TYPOSCRIPT_RENDERING',
+            '10.' => [
+                'request' => $request->getQueryParams()[self::argumentNamespace],
+            ],
+        ];
+
+        return $handler->handle($request);
+    }
+
+    /**
+     * @throws Exception
+     * @return void
+     *
+     */
+    private function ensureRequiredEnvironment()
+    {
+        if (empty($GLOBALS['TYPO3_CONF_VARS']['FE']['pageNotFoundOnCHashError'])) {
+            throw new Exception('$GLOBALS[\'TYPO3_CONF_VARS\'][\'FE\'][\'pageNotFoundOnCHashError\'] needs to be enabled when using out of bound typoscript rendering!', 1403808246);
+        }
+        if (empty($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['typoscript_rendering']['renderClasses']) || !is_array($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['typoscript_rendering']['renderClasses'])) {
+            throw new Exception('No renderer found in configuration: $GLOBALS[\'TYPO3_CONF_VARS\'][\'EXTCONF\'][\'typoscript_rendering\'][\'renderClasses\']', 1403808247);
+        }
+        if (!in_array('tx_typoscriptrendering[context]', $GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash']['requireCacheHashPresenceParameters'], true)) {
+            throw new Exception('tx_typoscriptrendering[context] must be set as required cHash parameter', 1403808248);
+        }
+    }
+}

Classes/Middleware/TypoScriptRenderingHandler.php

@@ -25,7 +25,7 @@ class RequestBuilder
      * @return Request
      *
      */
-    public function build($rawRequestArgument)
+    public function build($rawRequestArgument): Request
     {
         if (empty($rawRequestArgument['context']) || !is_string($rawRequestArgument['context'])) {
             throw new Exception('tx_typoscriptrendering|context must not be empty and must be of type string!', 1403793452);