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OutputCompression.php
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OutputCompression.php
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<?php
declare(strict_types = 1);
namespace TYPO3\CMS\Frontend\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\GeneralUtility;
use TYPO3\CMS\Core\Utility\MathUtility;
use TYPO3\CMS\Frontend\Utility\CompressionUtility;
/**
* Sets up output compression
*
* @internal
*/
class OutputCompression implements MiddlewareInterface
{
/**
* Clears all output and checks if a compression level is set
*
* @param ServerRequestInterface $request
* @param RequestHandlerInterface $handler
* @return ResponseInterface
*/
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);
}
/**
* Initialize output compression if configured
*/
protected function initializeOutputCompression()
{
if ($GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel'] && extension_loaded('zlib')) {
if (MathUtility::canBeInterpretedAsInteger($GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel'])) {
@ini_set('zlib.output_compression_level', (string)$GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel']);
}
ob_start([GeneralUtility::makeInstance(CompressionUtility::class), 'compressionOutputHandler']);
}
}
}