xref: /webtrees/app/Http/Middleware/CheckCsrf.php (revision e240f5e1c214ef53737cb73f56fb28d924638abd) 
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\Http\RequestHandlers\Logout;
25use Fisharebest\Webtrees\Http\RequestHandlers\SelectLanguage;
26use Fisharebest\Webtrees\Http\RequestHandlers\SelectTheme;
27use Fisharebest\Webtrees\I18N;
28use Fisharebest\Webtrees\Session;
29use Psr\Http\Message\ResponseInterface;
30use Psr\Http\Message\ServerRequestInterface;
31use Psr\Http\Server\MiddlewareInterface;
32use Psr\Http\Server\RequestHandlerInterface;
33
34use function in_array;
35
36/**
37 * Middleware to wrap a request in a transaction.
38 */
39class CheckCsrf implements MiddlewareInterface
40{
41    private const EXCLUDE_ROUTES = [
42        Logout::class,
43        SelectLanguage::class,
44        SelectTheme::class,
45    ];
46
47    /**
48     * @param ServerRequestInterface  $request
49     * @param RequestHandlerInterface $handler
50     *
51     * @return ResponseInterface
52     */
53    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
54    {
55        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
56            $params = (array) $request->getParsedBody();
57
58            $route = $params['route'] ?? '';
59
60            if (!in_array($route, self::EXCLUDE_ROUTES, true)) {
61                $client_token  = $params['_csrf'] ?? $request->getHeaderLine('X-CSRF-TOKEN');
62                $session_token = Session::get('CSRF_TOKEN');
63
64                if ($client_token !== $session_token) {
65                    FlashMessages::addMessage(I18N::translate('This form has expired. Try again.'));
66
67                    return redirect((string) $request->getUri());
68                }
69
70                unset($params['_csrf']);
71                $request = $request->withParsedBody($params);
72            }
73        }
74
75        return $handler->handle($request);
76    }
77}
78