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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 a POST request to the reCAPTCHA service, but makes use of fsockopen()
  43   * instead of get_file_contents(). This is to account for people who may be on
  44   * servers where allow_url_open is disabled.
  45   */
  46  class SocketPost implements RequestMethod
  47  {
  48      /**
  49       * Socket to the reCAPTCHA service
  50       * @var Socket
  51       */
  52      private $socket;
  53  
  54      /**
  55       * Only needed if you want to override the defaults
  56       *
  57       * @param \ReCaptcha\RequestMethod\Socket $socket optional socket, injectable for testing
  58       * @param string $siteVerifyUrl URL for reCAPTCHA siteverify API
  59       */
  60      public function __construct(Socket $socket = null, $siteVerifyUrl = null)
  61      {
  62          $this->socket = (is_null($socket)) ? new Socket() : $socket;
  63          $this->siteVerifyUrl = (is_null($siteVerifyUrl)) ? ReCaptcha::SITE_VERIFY_URL : $siteVerifyUrl;
  64      }
  65  
  66      /**
  67       * Submit the POST request with the specified parameters.
  68       *
  69       * @param RequestParameters $params Request parameters
  70       * @return string Body of the reCAPTCHA response
  71       */
  72      public function submit(RequestParameters $params)
  73      {
  74          $errno = 0;
  75          $errstr = '';
  76          $urlParsed = parse_url($this->siteVerifyUrl);
  77  
  78          if (false === $this->socket->fsockopen('ssl://' . $urlParsed['host'], 443, $errno, $errstr, 30)) {
  79              return '{"success": false, "error-codes": ["'.ReCaptcha::E_CONNECTION_FAILED.'"]}';
  80          }
  81  
  82          $content = $params->toQueryString();
  83  
  84          $request = "POST " . $urlParsed['path'] . " HTTP/1.0\r\n";
  85          $request .= "Host: " . $urlParsed['host'] . "\r\n";
  86          $request .= "Content-Type: application/x-www-form-urlencoded\r\n";
  87          $request .= "Content-length: " . strlen($content) . "\r\n";
  88          $request .= "Connection: close\r\n\r\n";
  89          $request .= $content . "\r\n\r\n";
  90  
  91          $this->socket->fwrite($request);
  92          $response = '';
  93  
  94          while (!$this->socket->feof()) {
  95              $response .= $this->socket->fgets(4096);
  96          }
  97  
  98          $this->socket->fclose();
  99  
 100          if (0 !== strpos($response, 'HTTP/1.0 200 OK')) {
 101              return '{"success": false, "error-codes": ["'.ReCaptcha::E_BAD_RESPONSE.'"]}';
 102          }
 103  
 104          $parts = preg_split("#\n\s*\n#Uis", $response);
 105  
 106          return $parts[1];
 107      }
 108  }