[FEATURE] Allow PSR-7 dispatching for Backend modules

The newly introduced simple dispatcher handles the distribution
of all "traditional" modules through a new option called "routeTarget" when registering a module.

All existing core modules are moved to this new syntax, all left-over
index.php files within Modules/ directories are removed.

Resolves: #69918
Releases: master
Change-Id: I6200a5e0309454fd981c9f1fa277d948974a1fac
Reviewed-on: http://review.typo3.org/43375

Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>

typo3/sysext/backend/Classes/Controller/PageLayoutController.php

@@ -14,6 +14,8 @@ namespace TYPO3\CMS\Backend\Controller;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Form\Exception\AccessDeniedException;
 use TYPO3\CMS\Backend\Form\FormDataCompiler;
 use TYPO3\CMS\Backend\Form\FormDataGroup\TcaDatabaseRecord;
@@ -489,6 +491,23 @@ class PageLayoutController {
 		}
 	}
 
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * As this controller goes only through the main() method, it is rather simple for now
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+		$this->clearCache();
+		$this->main();
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Main function.
 	 * Creates some general objects and calls other functions for the main rendering of module content.
@@ -1053,8 +1072,10 @@ class PageLayoutController {
 	 * Print accumulated content of module
 	 *
 	 * @return void
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		echo $this->content;
 	}
 

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

@@ -20,6 +20,7 @@ use TYPO3\CMS\Core\Core\Bootstrap;
 use TYPO3\CMS\Core\FormProtection\BackendFormProtection;
 use TYPO3\CMS\Core\FormProtection\FormProtectionFactory;
 use TYPO3\CMS\Core\Exception;
+use TYPO3\CMS\Core\Http\Dispatcher;
 use TYPO3\CMS\Core\Http\RequestHandlerInterface;
 use TYPO3\CMS\Core\Http\Response;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -177,21 +178,31 @@ class BackendModuleRequestHandler implements RequestHandlerInterface {
 			}
 		}
 
-		$configuration = array(
-			'extensionName' => $moduleConfiguration['extensionName'],
-			'pluginName' => $moduleName
-		);
-		if (isset($moduleConfiguration['vendorName'])) {
-			$configuration['vendorName'] = $moduleConfiguration['vendorName'];
-		}
-
-		// Run Extbase
-		$bootstrap = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Core\Bootstrap::class);
-		$content = $bootstrap->run('', $configuration);
-
 		/** @var Response $response */
 		$response = GeneralUtility::makeInstance(Response::class);
-		$response->getBody()->write($content);
+
+		// Use Core Dispatching
+		if (isset($moduleConfiguration['routeTarget'])) {
+			$dispatcher = GeneralUtility::makeInstance(Dispatcher::class);
+			$this->request = $this->request->withAttribute('target', $moduleConfiguration['routeTarget']);
+			$response = $dispatcher->dispatch($this->request, $response);
+		} else {
+			// extbase module
+			$configuration = array(
+				'extensionName' => $moduleConfiguration['extensionName'],
+				'pluginName' => $moduleName
+			);
+			if (isset($moduleConfiguration['vendorName'])) {
+				$configuration['vendorName'] = $moduleConfiguration['vendorName'];
+			}
+
+			// Run Extbase
+			$bootstrap = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Core\Bootstrap::class);
+			$content = $bootstrap->run('', $configuration);
+
+			$response->getBody()->write($content);
+		}
+
 		return $response;
 	}
 

typo3/sysext/backend/Classes/Module/ModuleLoader.php

@@ -306,10 +306,11 @@ class ModuleLoader {
 		}
 
 		// Default script setup
-		if ($setupInformation['configuration']['script'] === '_DISPATCH') {
+		if ($setupInformation['configuration']['script'] === '_DISPATCH' || isset($setupInformation['configuration']['routeTarget'])) {
 			if ($setupInformation['configuration']['extbase']) {
 				$finalModuleConfiguration['script'] = BackendUtility::getModuleUrl('Tx_' . $name);
 			} else {
+				// just go through BackendModuleRequestHandler where the routeTarget is resolved
 				$finalModuleConfiguration['script'] = BackendUtility::getModuleUrl($name);
 			}
 		} elseif ($setupInformation['configuration']['script'] && file_exists($setupInformation['path'] . '/' . $setupInformation['configuration']['script'])) {

typo3/sysext/backend/Modules/Layout/index.php

-<?php
-/*
- * 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!
- */
-
-$GLOBALS['SOBE'] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Controller\PageLayoutController::class);
-$GLOBALS['SOBE']->init();
-$GLOBALS['SOBE']->clearCache();
-$GLOBALS['SOBE']->main();
-$GLOBALS['SOBE']->printContent();

typo3/sysext/backend/ext_tables.php

@@ -7,9 +7,9 @@ if (TYPO3_MODE === 'BE') {
 		'web',
 		'layout',
 		'top',
-		'EXT:backend/Modules/Layout/',
+		'',
 		array(
-			'script' => '_DISPATCH',
+			'routeTarget' => \TYPO3\CMS\Backend\Controller\PageLayoutController::class . '::mainAction',
 			'access' => 'user,group',
 			'name' => 'web_layout',
 			'labels' => array(

typo3/sysext/core/Documentation/Changelog/master/Feature-69918-AddPSR-7-basedDispatchingForBackendModules.rst

+=================================================================
+Feature: #69918 - Add PSR-7-based dispatching for Backend Modules
+=================================================================
+
+Description
+===========
+
+Built on the PSR-7 principle and the routing concepts, it is now possible to register backend modules which are dispatched to a callable string
+instead of pointing to an index.php file in EXT:myextension/Modules/MyModule/index.php.
+
+The method which is called, receives a PSR-compatible request and response object and must return a response object which is outputted to the
+browser.
+
+An example registration uses the option "routeTarget" to resolve the method to be called when rendering the module:
+
+.. code-block:: typoscript
+
+	\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addModule(
+		'web',
+		'layout',
+		'top',
+		'',
+		array(
+			'routeTarget' => \TYPO3\CMS\Backend\Controller\PageLayoutController::class . '::mainAction',
+			'access' => 'user,group',
+			'name' => 'web_layout',
+			'labels' => array(
+				'tabs_images' => array(
+					'tab' => 'EXT:backend/Resources/Public/Icons/module-page.svg',
+				),
+				'll_ref' => 'LLL:EXT:backend/Resources/Private/Language/locallang_mod.xlf',
+			),
+		)
+	);
\ No newline at end of file

typo3/sysext/dbal/Classes/Controller/ModuleController.php

@@ -14,7 +14,10 @@ namespace TYPO3\CMS\Dbal\Controller;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 /**
  * Script class; Backend module for DBAL extension
@@ -72,9 +75,9 @@ class ModuleController extends \TYPO3\CMS\Backend\Module\BaseScriptClass {
 		$languageService = $this->getLanguageService();
 		$this->thisScript = BackendUtility::getModuleUrl($this->MCONF['name']);
 		// Clean up settings:
-		$this->MOD_SETTINGS = BackendUtility::getModuleData($this->MOD_MENU, \TYPO3\CMS\Core\Utility\GeneralUtility::_GP('SET'), $this->MCONF['name']);
+		$this->MOD_SETTINGS = BackendUtility::getModuleData($this->MOD_MENU, GeneralUtility::_GP('SET'), $this->MCONF['name']);
 		// Draw the header
-		$this->doc = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Template\DocumentTemplate::class);
+		$this->doc = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Template\DocumentTemplate::class);
 		$this->doc->form = '<form action="" method="post">';
 		// DBAL page title:
 		$this->content .= $this->doc->startPage($languageService->getLL('title'));
@@ -104,19 +107,38 @@ class ModuleController extends \TYPO3\CMS\Backend\Module\BaseScriptClass {
 	 * Prints out the module HTML
 	 *
 	 * @return string HTML output
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		$this->content .= $this->doc->endPage();
 		echo $this->content;
 	}
 
+
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * As this controller goes only through the main() method, it is rather simple for now
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+		$this->main();
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Displays a form to check DBAL SQL methods and parse raw SQL.
 	 *
 	 * @return string HTML output
 	 */
 	protected function printSqlCheck() {
-		$input = \TYPO3\CMS\Core\Utility\GeneralUtility::_GP('tx_dbal');
+		$input = GeneralUtility::_GP('tx_dbal');
 		$out = '
 			<form name="sql_check" action="' . $this->thisScript . '" method="post" enctype="multipart/form-data">
 			<script type="text/javascript">
@@ -287,7 +309,7 @@ updateQryForm(\'' . $input['QUERY'] . '\');
 	 */
 	protected function printCachedInfo() {
 		// Get cmd:
-		if ((string)\TYPO3\CMS\Core\Utility\GeneralUtility::_GP('cmd') === 'clear') {
+		if ((string)GeneralUtility::_GP('cmd') === 'clear') {
 			$GLOBALS['TYPO3_DB']->clearCachedFieldInfo();
 			$GLOBALS['TYPO3_DB']->cacheFieldInfo();
 		}
@@ -367,7 +389,7 @@ updateQryForm(\'' . $input['QUERY'] . '\');
 		// Disable debugging in any case...
 		$GLOBALS['TYPO3_DB']->debug = FALSE;
 		// Get cmd:
-		$cmd = (string)\TYPO3\CMS\Core\Utility\GeneralUtility::_GP('cmd');
+		$cmd = (string)GeneralUtility::_GP('cmd');
 		switch ($cmd) {
 			case 'flush':
 				$res = $GLOBALS['TYPO3_DB']->exec_TRUNCATEquery('tx_dbal_debuglog');
@@ -489,7 +511,7 @@ updateQryForm(\'' . $input['QUERY'] . '\');
 				break;
 			default:
 				// Look for request to view specific script exec:
-				$specTime = \TYPO3\CMS\Core\Utility\GeneralUtility::_GP('specTime');
+				$specTime = GeneralUtility::_GP('specTime');
 				if ($specTime) {
 					$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery('exec_time,errorFlag,table_join,serdata,query', 'tx_dbal_debuglog', 'tstamp=' . (int)$specTime);
 					$tRows = array();
@@ -545,7 +567,7 @@ updateQryForm(\'' . $input['QUERY'] . '\');
 					<a href="' . $this->thisScript . '">LOG</a> -
 					<a href="' . $this->thisScript . '&amp;cmd=where">WHERE</a> -
 
-					<a href="' . htmlspecialchars(\TYPO3\CMS\Core\Utility\GeneralUtility::linkThisScript()) . '" target="tx_debuglog">[New window]</a>
+					<a href="' . htmlspecialchars(GeneralUtility::linkThisScript()) . '" target="tx_debuglog">[New window]</a>
 					<hr />
 		';
 		return $menu . $outStr;

typo3/sysext/dbal/Modules/Dbal/index.php

-<?php
-/*
- * 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!
- */
-
-/**
- * Module 'DBAL Debug' for the 'dbal' extension.
- */
-
-$GLOBALS['SOBE'] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Dbal\Controller\ModuleController::class);
-$GLOBALS['SOBE']->init();
-$GLOBALS['SOBE']->main();
-$GLOBALS['SOBE']->printContent();

typo3/sysext/dbal/ext_tables.php

@@ -6,9 +6,9 @@ if (TYPO3_MODE === 'BE') {
 		'tools',
 		'txdbalM1',
 		'',
-		'EXT:dbal/Modules/Dbal/',
+		'',
 		array(
-			'script' => '_DISPATCH',
+			'routeTarget' => \TYPO3\CMS\Dbal\Controller\ModuleController::class . '::mainAction',
 			'access' => 'admin',
 			'name' => 'tools_txdbalM1',
 			'labels' => array(

typo3/sysext/func/Classes/Controller/PageFunctionsController.php

@@ -14,6 +14,8 @@ namespace TYPO3\CMS\Func\Controller;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
 use TYPO3\CMS\Core\Imaging\Icon;
 use TYPO3\CMS\Core\Imaging\IconFactory;
@@ -64,6 +66,29 @@ class PageFunctionsController extends \TYPO3\CMS\Backend\Module\BaseScriptClass
 		);
 	}
 
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * Then checks for module functions that have hooked in, and renders menu etc.
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+
+		// Checking for first level external objects
+		$this->checkExtObj();
+
+		// Checking second level external objects
+		$this->checkSubExtObj();
+		$this->main();
+
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Initialize module header etc and call extObjContent function
 	 *
@@ -132,8 +157,10 @@ class PageFunctionsController extends \TYPO3\CMS\Backend\Module\BaseScriptClass
 	 * Print module content (from $this->content)
 	 *
 	 * @return void
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		echo $this->content;
 	}
 

typo3/sysext/func/Modules/AdvancedFunctions/index.php

-<?php
-/*
- * 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!
- */
-
-/**
- * Module: Advanced functions
- * Advanced Functions related to pages
- */
-
-/** @var $SOBE \TYPO3\CMS\Func\Controller\PageFunctionsController */
-$GLOBALS['SOBE'] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Func\Controller\PageFunctionsController::class);
-$GLOBALS['SOBE']->init();
-
-// Checking for first level external objects
-$GLOBALS['SOBE']->checkExtObj();
-
-// Checking second level external objects
-$GLOBALS['SOBE']->checkSubExtObj();
-$GLOBALS['SOBE']->main();
-$GLOBALS['SOBE']->printContent();

typo3/sysext/func/ext_tables.php

@@ -6,9 +6,9 @@ if (TYPO3_MODE === 'BE') {
 		'web',
 		'func',
 		'',
-		'EXT:func/Modules/AdvancedFunctions/',
+		'',
 		array(
-			'script' => '_DISPATCH',
+			'routeTarget' => \TYPO3\CMS\Func\Controller\PageFunctionsController::class . '::mainAction',
 			'access' => 'user,group',
 			'name' => 'web_func',
 			'labels' => array(

typo3/sysext/info/Classes/Controller/InfoModuleController.php

@@ -14,6 +14,8 @@ namespace TYPO3\CMS\Info\Controller;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Module\BaseScriptClass;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
 use TYPO3\CMS\Backend\Utility\IconUtility;
@@ -131,12 +133,38 @@ class InfoModuleController extends BaseScriptClass {
 	 * Print module content (from $this->content)
 	 *
 	 * @return void
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		$this->content = $this->doc->insertStylesAndJS($this->content);
 		echo $this->content;
 	}
 
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * Then checks for module functions that have hooked in, and renders menu etc.
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+
+		// Checking for first level external objects
+		$this->checkExtObj();
+
+		// Checking second level external objects
+		$this->checkSubExtObj();
+		$this->main();
+
+		$this->content = $this->doc->insertStylesAndJS($this->content);
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Create the panel of buttons for submitting the form or otherwise perform operations.
 	 *

typo3/sysext/info/Modules/Info/index.php

-<?php
-/*
- * 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!
- */
-
-/**
- * Module: Web>Info
- * Presents various page related information from extensions
- */
-$GLOBALS['SOBE'] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Info\Controller\InfoModuleController::class);
-$GLOBALS['SOBE']->init();
-
-// Checking for first level external objects
-$GLOBALS['SOBE']->checkExtObj();
-
-// Checking second level external objects
-$GLOBALS['SOBE']->checkSubExtObj();
-$GLOBALS['SOBE']->main();
-$GLOBALS['SOBE']->printContent();

typo3/sysext/info/ext_tables.php

@@ -6,9 +6,9 @@ if (TYPO3_MODE === 'BE') {
 		'web',
 		'info',
 		'',
-		'EXT:info/Modules/Info/',
+		'',
 		array(
-			'script' => '_DISPATCH',
+			'routeTarget' => \TYPO3\CMS\Info\Controller\InfoModuleController::class . '::mainAction',
 			'access' => 'user,group',
 			'name' => 'web_info',
 			'labels' => array(

typo3/sysext/lowlevel/Classes/View/ConfigurationView.php

@@ -14,6 +14,8 @@ namespace TYPO3\CMS\Lowlevel\View;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Module\BaseScriptClass;
 use TYPO3\CMS\Backend\Template\DocumentTemplate;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
@@ -59,6 +61,7 @@ class ConfigurationView extends BaseScriptClass {
 		$this->doc->setModuleTemplate('EXT:lowlevel/Resources/Private/Templates/config.html');
 		$this->doc->form = '<form action="" method="post">';
 		$this->doc->addStyleSheet('module', 'sysext/lowlevel/Resources/Public/Css/styles.css');
+		$this->doc->bodyTagId = 'ext-lowlevel-Modules-Configuration-index-php';
 	}
 
 	/**
@@ -203,12 +206,32 @@ class ConfigurationView extends BaseScriptClass {
 		$this->content = $this->doc->render('Configuration', $this->content);
 	}
 
+
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * Simply calls main() and init() and outputs the content
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+		$this->main();
+
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Print output to browser
 	 *
 	 * @return void
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		echo $this->content;
 	}
 

typo3/sysext/lowlevel/Classes/View/DatabaseIntegrityView.php

@@ -14,6 +14,8 @@ namespace TYPO3\CMS\Lowlevel\View;
  * The TYPO3 project - inspiring people to share!
  */
 
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Backend\Module\BaseScriptClass;
 use TYPO3\CMS\Backend\Template\DocumentTemplate;
 use TYPO3\CMS\Backend\Utility\IconUtility;
@@ -211,11 +213,30 @@ class DatabaseIntegrityView extends BaseScriptClass {
 	 * Print content
 	 *
 	 * @return void
+	 * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
 	 */
 	public function printContent() {
+		GeneralUtility::logDeprecatedFunction();
 		echo $this->content;
 	}
 
+	/**
+	 * Injects the request object for the current request or subrequest
+	 * Simply calls main() and init() and outputs the content
+	 *
+	 * @param ServerRequestInterface $request the current request
+	 * @param ResponseInterface $response
+	 * @return ResponseInterface the response with the content
+	 */
+	public function mainAction(ServerRequestInterface $request, ResponseInterface $response) {
+		$GLOBALS['SOBE'] = $this;
+		$this->init();
+		$this->main();
+
+		$response->getBody()->write($this->content);
+		return $response;
+	}
+
 	/**
 	 * Create the panel of buttons for submitting the form or otherwise perform operations.
 	 *

typo3/sysext/lowlevel/Modules/Configuration/index.php

-<?php
-/*
- * 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.