ExtDirectEidController.php

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<?php
namespace TYPO3\CMS\Frontend\Controller;

/*
 * 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 TYPO3\CMS\Core\Http\AjaxRequestHandler;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Frontend\Utility\EidUtility;

class ExtDirectEidController
{
    protected $ajaxObject = null;

    protected function routeAction($ajaxID)
    {
        EidUtility::initLanguage();
        $ajaxScript = $GLOBALS['TYPO3_CONF_VARS']['BE']['AJAX']['ExtDirect::' . $ajaxID]['callbackMethod'];
        $this->ajaxObject = GeneralUtility::makeInstance(AjaxRequestHandler::class, 'ExtDirect::' . $ajaxID);
        $parameters = [];
        GeneralUtility::callUserFunction($ajaxScript, $parameters, $this->ajaxObject, false, true);
    }

    public function processRequest(ServerRequestInterface $request, ResponseInterface $response)
    {
        $action = isset($request->getParsedBody()['action'])
            ? $request->getParsedBody()['action']
            : (isset($request->getQueryParams()['action']) ? $request->getQueryParams()['action'] : '');
        if (!in_array($action, ['route', 'getAPI'], true)) {
            return null;
        }
        $this->routeAction($action);
        return $this->ajaxObject->render();
    }
}