1<?php
2/**
3 * This is a PHP library that handles calling reCAPTCHA.
4 *
5 * @copyright Copyright (c) 2015, Google Inc.
6 * @link      http://www.google.com/recaptcha
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27namespace ReCaptcha\RequestMethod;
28
29use ReCaptcha\RequestMethod;
30use ReCaptcha\RequestParameters;
31
32/**
33 * Sends POST requests to the reCAPTCHA service.
34 */
35class Post implements RequestMethod
36{
37    /**
38     * URL to which requests are POSTed.
39     * @const string
40     */
41    const SITE_VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify';
42
43    /**
44     * Submit the POST request with the specified parameters.
45     *
46     * @param RequestParameters $params Request parameters
47     * @return string Body of the reCAPTCHA response
48     */
49    public function submit(RequestParameters $params)
50    {
51        /**
52         * PHP 5.6.0 changed the way you specify the peer name for SSL context options.
53         * Using "CN_name" will still work, but it will raise deprecated errors.
54         */
55        $peer_key = version_compare(PHP_VERSION, '5.6.0', '<') ? 'CN_name' : 'peer_name';
56        $options = array(
57            'http' => array(
58                'header' => "Content-type: application/x-www-form-urlencoded\r\n",
59                'method' => 'POST',
60                'content' => $params->toQueryString(),
61                // Force the peer to validate (not needed in 5.6.0+, but still works
62                'verify_peer' => true,
63                // Force the peer validation to use www.google.com
64                $peer_key => 'www.google.com',
65            ),
66        );
67        $context = stream_context_create($options);
68        return file_get_contents(self::SITE_VERIFY_URL, false, $context);
69    }
70}
71