xref: /webtrees/app/Http/Middleware/ContentLength.php (revision af7b1f136d0947b42fda7a736f4b48319cc835dd) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2021 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Http\Middleware;
21
22use Psr\Http\Message\RequestInterface;
23use Psr\Http\Message\ResponseInterface;
24use Psr\Http\Message\ServerRequestInterface;
25use Psr\Http\Message\StreamFactoryInterface;
26use Psr\Http\Server\MiddlewareInterface;
27use Psr\Http\Server\RequestHandlerInterface;
28
29use function extension_loaded;
30use function gzdeflate;
31use function gzencode;
32use function in_array;
33use function str_contains;
34use function strlen;
35use function strstr;
36use function strtolower;
37use function strtr;
38
39/**
40 * Middleware to add a "Content-Length" header to a response.
41 */
42class ContentLength implements MiddlewareInterface
43{
44    /**
45     * @param ServerRequestInterface  $request
46     * @param RequestHandlerInterface $handler
47     *
48     * @return ResponseInterface
49     */
50    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
51    {
52        $response = $handler->handle($request);
53
54        if ($response->hasHeader('content-length')) {
55            return $response;
56        }
57
58        $content_length = $response->getBody()->getSize();
59
60        if ($content_length === null) {
61            return $response;
62        }
63
64        return $response
65            ->withHeader('content-length', (string) $content_length);
66    }
67}
68