xref: /webtrees/app/Http/Middleware/CheckCsrf.php (revision 8fb0f35ec023dbdcc3de06551bf957cb6f7f6faf) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2019 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 <http://www.gnu.org/licenses/>.
16 */
17declare(strict_types=1);
18
19namespace Fisharebest\Webtrees\Http\Middleware;
20
21use Fig\Http\Message\RequestMethodInterface;
22use Fisharebest\Webtrees\FlashMessages;
23use Fisharebest\Webtrees\I18N;
24use Fisharebest\Webtrees\Session;
25use Psr\Http\Message\ResponseInterface;
26use Psr\Http\Message\ServerRequestInterface;
27use Psr\Http\Server\MiddlewareInterface;
28use Psr\Http\Server\RequestHandlerInterface;
29
30use function in_array;
31
32/**
33 * Middleware to wrap a request in a transaction.
34 */
35class CheckCsrf implements MiddlewareInterface
36{
37    private const EXCLUDE_ROUTES = [
38        'language',
39        'theme',
40    ];
41
42    /**
43     * @param ServerRequestInterface  $request
44     * @param RequestHandlerInterface $handler
45     *
46     * @return ResponseInterface
47     */
48    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
49    {
50        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
51            $route = $request->getQueryParams()['route'] ?? '';
52
53            if (!in_array($route, self::EXCLUDE_ROUTES, true)) {
54                $client_token  = $request->getParsedBody()['csrf'] ?? $request->getHeaderLine('X-CSRF-TOKEN');
55                $session_token = Session::get('CSRF_TOKEN');
56
57                if ($client_token !== $session_token) {
58                    FlashMessages::addMessage(I18N::translate('This form has expired. Try again.'));
59                    $default_uri = $request->getAttribute('base_url');
60
61                    return redirect($request->getAttribute('request_uri', $default_uri));
62                }
63            }
64        }
65
66        return $handler->handle($request);
67    }
68}
69