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   1  <?php
   2  /**
   3   * This is a PHP library that handles calling reCAPTCHA.
   4   *
   5   * BSD 3-Clause License
   6   * @copyright (c) 2019, Google Inc.
   7   * @link https://www.google.com/recaptcha
   8   * All rights reserved.
   9   *
  10   * Redistribution and use in source and binary forms, with or without
  11   * modification, are permitted provided that the following conditions are met:
  12   * 1. Redistributions of source code must retain the above copyright notice, this
  13   *    list of conditions and the following disclaimer.
  14   *
  15   * 2. Redistributions in binary form must reproduce the above copyright notice,
  16   *    this list of conditions and the following disclaimer in the documentation
  17   *    and/or other materials provided with the distribution.
  18   *
  19   * 3. Neither the name of the copyright holder nor the names of its
  20   *    contributors may be used to endorse or promote products derived from
  21   *    this software without specific prior written permission.
  22   *
  23   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  24   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  27   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  29   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  30   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33   */
  34  
  35  namespace ReCaptcha\RequestMethod;
  36  
  37  use ReCaptcha\ReCaptcha;
  38  use ReCaptcha\RequestMethod;
  39  use ReCaptcha\RequestParameters;
  40  
  41  /**
  42   * Sends POST requests to the reCAPTCHA service.
  43   */
  44  class Post implements RequestMethod
  45  {
  46      /**
  47       * URL for reCAPTCHA siteverify API
  48       * @var string
  49       */
  50      private $siteVerifyUrl;
  51  
  52      /**
  53       * Only needed if you want to override the defaults
  54       *
  55       * @param string $siteVerifyUrl URL for reCAPTCHA siteverify API
  56       */
  57      public function __construct($siteVerifyUrl = null)
  58      {
  59          $this->siteVerifyUrl = (is_null($siteVerifyUrl)) ? ReCaptcha::SITE_VERIFY_URL : $siteVerifyUrl;
  60      }
  61  
  62      /**
  63       * Submit the POST request with the specified parameters.
  64       *
  65       * @param RequestParameters $params Request parameters
  66       * @return string Body of the reCAPTCHA response
  67       */
  68      public function submit(RequestParameters $params)
  69      {
  70          $options = array(
  71              'http' => array(
  72                  'header' => "Content-type: application/x-www-form-urlencoded\r\n",
  73                  'method' => 'POST',
  74                  'content' => $params->toQueryString(),
  75                  // Force the peer to validate (not needed in 5.6.0+, but still works)
  76                  'verify_peer' => true,
  77              ),
  78          );
  79          $context = stream_context_create($options);
  80          $response = file_get_contents($this->siteVerifyUrl, false, $context);
  81  
  82          if ($response !== false) {
  83              return $response;
  84          }
  85  
  86          return '{"success": false, "error-codes": ["'.ReCaptcha::E_CONNECTION_FAILED.'"]}';
  87      }
  88  }