LoginFramesetController.php

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<?php
namespace TYPO3\CMS\Backend\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\Backend\Utility\BackendUtility;
use TYPO3\CMS\Core\Page\PageRenderer;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class LoginFramesetController
{
    protected $content;

    public function __construct()
    {
        $GLOBALS['SOBE'] = $this;
    }

    public function mainAction(ServerRequestInterface $request, ResponseInterface $response)
    {
        $this->main();
        $response->getBody()->write($this->content);
        return $response;
    }

    public function main()
    {
        $title = 'TYPO3 Re-Login (' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'] . ')';
        $this->getDocumentTemplate()->startPage($title);

        // Create the frameset for the window
        $this->content = $this->getPageRenderer()->render(PageRenderer::PART_HEADER) . '
            <frameset rows="*,1">
                <frame name="login" src="index.php?loginRefresh=1" marginwidth="0" marginheight="0" scrolling="no" noresize="noresize" />
                <frame name="dummy" src="' . htmlspecialchars(BackendUtility::getModuleUrl('dummy')) . '" marginwidth="0" marginheight="0" scrolling="auto" noresize="noresize" />
            </frameset>
        </html>';
    }

    protected function getDocumentTemplate()
    {
        return $GLOBALS['TBE_TEMPLATE'];
    }

    protected function getPageRenderer()
    {
        return GeneralUtility::makeInstance(PageRenderer::class);
    }
}