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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  }