<?php

declare(strict_types=1);

/*
 * 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!
 */

namespace TYPO3\CMS\Frontend\Middleware;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use TYPO3\CMS\Core\Context\Context;

/**
 * Add content-length HTTP header to the response.
 *
 * Notice that all Content outside the length of the content-length header will be cut off!
 * Therefore, content of unknown length from later-on middlewares and if admin users are logged
 * in (admin panel might show...), we disable it!
 *
 * @internal
 */
final readonly class ContentLengthResponseHeader implements MiddlewareInterface
{
    public function __construct(private Context $context) {}

    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $response = $handler->handle($request);
        $typoScriptConfigArray = $request->getAttribute('frontend.typoscript')->getConfigArray();
        if (
            (!isset($typoScriptConfigArray['enableContentLengthHeader']) || $typoScriptConfigArray['enableContentLengthHeader'])
            && !$this->context->getPropertyFromAspect('backend.user', 'isLoggedIn', false)
            && !$this->context->getPropertyFromAspect('workspace', 'isOffline', false)
        ) {
            $response = $response->withHeader('Content-Length', (string)$response->getBody()->getSize());
        }
        return $response;
    }
}