xref: /webtrees/app/Http/Middleware/CheckCsrf.php (revision ba1d7494e9648df5a87aaa3fece3e098e5ce26b1) 
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 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Http\Middleware;
21
22use Fig\Http\Message\RequestMethodInterface;
23use Fisharebest\Webtrees\FlashMessages;
24use Fisharebest\Webtrees\I18N;
25use Fisharebest\Webtrees\Session;
26use Psr\Http\Message\ResponseInterface;
27use Psr\Http\Message\ServerRequestInterface;
28use Psr\Http\Server\MiddlewareInterface;
29use Psr\Http\Server\RequestHandlerInterface;
30
31use function in_array;
32
33/**
34 * Middleware to wrap a request in a transaction.
35 */
36class CheckCsrf implements MiddlewareInterface
37{
38    private const EXCLUDE_ROUTES = [
39        'language',
40        'theme',
41    ];
42
43    /**
44     * @param ServerRequestInterface  $request
45     * @param RequestHandlerInterface $handler
46     *
47     * @return ResponseInterface
48     */
49    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
50    {
51        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
52            $route = $request->getQueryParams()['route'] ?? '';
53
54            if (!in_array($route, self::EXCLUDE_ROUTES, true)) {
55                $client_token  = $request->getParsedBody()['csrf'] ?? $request->getHeaderLine('X-CSRF-TOKEN');
56                $session_token = Session::get('CSRF_TOKEN');
57
58                if ($client_token !== $session_token) {
59                    FlashMessages::addMessage(I18N::translate('This form has expired. Try again.'));
60
61                    return redirect((string) $request->getUri());
62                }
63
64                $params = $request->getParsedBody();
65                unset($params['csrf']);
66                $request = $request->withParsedBody($params);
67            }
68        }
69
70        return $handler->handle($request);
71    }
72}
73