xref: /webtrees/app/Http/Middleware/CheckCsrf.php (revision b46c87bda4b592cf9252f1db48552a820b1e3d97) 
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            $params = (array) $request->getParsedBody();
53
54            $route = $params['route'] ?? '';
55
56            if (!in_array($route, self::EXCLUDE_ROUTES, true)) {
57                $client_token  = $params['csrf'] ?? $request->getHeaderLine('X-CSRF-TOKEN');
58                $session_token = Session::get('CSRF_TOKEN');
59
60                if ($client_token !== $session_token) {
61                    FlashMessages::addMessage(I18N::translate('This form has expired. Try again.'));
62
63                    return redirect((string) $request->getUri());
64                }
65
66                unset($params['csrf']);
67                $request = $request->withParsedBody($params);
68            }
69        }
70
71        return $handler->handle($request);
72    }
73}
74