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  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.  
  27. namespace ReCaptcha\RequestMethod;
  28.  
  29. use ReCaptcha\RequestMethod;
  30. use ReCaptcha\RequestParameters;
  31.  
  32. /**
  33.  * Sends POST requests to the reCAPTCHA service.
  34.  */
  35. class 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.