9.5/backend_2_classes_2_middleware_2_output_compression_8php_source.html

<?php

declare(strict_types = 1);

namespace ‪TYPO3\CMS\Backend\Middleware;


/*

 * 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 Psr\Http\Server\MiddlewareInterface;

use Psr\Http\Server\RequestHandlerInterface;

use ‪TYPO3\CMS\Core\Utility\MathUtility;


class ‪OutputCompression implements MiddlewareInterface

{

    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface

    {

        // Throw away all output that may have happened during bootstrapping by weird extensions

        ob_clean();

        // Initialize output compression if configured

        $this->‪initializeOutputCompression();


        return $handler->handle($request);

    }


    protected function ‪initializeOutputCompression()

    {

        if (extension_loaded('zlib') && ‪$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']) {

            if (‪MathUtility::canBeInterpretedAsInteger(‪$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel'])) {

                @ini_set('zlib.output_compression_level', (string)‪$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']);

            }

            ob_start('ob_gzhandler');

        }

    }

}