RequestHandler.php

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<?php
namespace TYPO3\CMS\Install\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\ServerRequestInterface;
use TYPO3\CMS\Core\Core\Bootstrap;
use TYPO3\CMS\Core\Http\RequestHandlerInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class RequestHandler implements RequestHandlerInterface
{
    protected $bootstrap;

    public function __construct(Bootstrap $bootstrap)
    {
        $this->bootstrap = $bootstrap;
    }

    public function handleRequest(ServerRequestInterface $request)
    {
        $getPost = !empty($request->getQueryParams()['install']) ? $request->getQueryParams()['install'] : $request->getParsedBody()['install'];
        switch ($getPost['controller']) {
            case 'tool':
                $controllerClassName = \TYPO3\CMS\Install\Controller\ToolController::class;
                break;
            case 'ajax':
                $controllerClassName = \TYPO3\CMS\Install\Controller\AjaxController::class;
                break;
            default:
                $controllerClassName = \TYPO3\CMS\Install\Controller\StepController::class;
        }
        GeneralUtility::makeInstance($controllerClassName)->execute();
    }

    public function canHandleRequest(ServerRequestInterface $request)
    {
        return true;
    }

    public function getPriority()
    {
        return 20;
    }
}