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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 a POST request to the reCAPTCHA service, but makes use of fsockopen()
  34   * instead of get_file_contents(). This is to account for people who may be on
  35   * servers where allow_furl_open is disabled.
  36   */
  37  class SocketPost implements RequestMethod
  38  {
  39      /**
  40       * reCAPTCHA service host.
  41       * @const string
  42       */
  43      const RECAPTCHA_HOST = 'www.google.com';
  44  
  45      /**
  46       * @const string reCAPTCHA service path
  47       */
  48      const SITE_VERIFY_PATH = '/recaptcha/api/siteverify';
  49  
  50      /**
  51       * @const string Bad request error
  52       */
  53      const BAD_REQUEST = '{"success": false, "error-codes": ["invalid-request"]}';
  54  
  55      /**
  56       * @const string Bad response error
  57       */
  58      const BAD_RESPONSE = '{"success": false, "error-codes": ["invalid-response"]}';
  59  
  60      /**
  61       * Socket to the reCAPTCHA service
  62       * @var Socket
  63       */
  64      private $socket;
  65  
  66      /**
  67       * Constructor
  68       *
  69       * @param \ReCaptcha\RequestMethod\Socket $socket optional socket, injectable for testing
  70       */
  71      public function __construct(Socket $socket = null)
  72      {
  73          if (!is_null($socket)) {
  74              $this->socket = $socket;
  75          } else {
  76              $this->socket = new Socket();
  77          }
  78      }
  79  
  80      /**
  81       * Submit the POST request with the specified parameters.
  82       *
  83       * @param RequestParameters $params Request parameters
  84       * @return string Body of the reCAPTCHA response
  85       */
  86      public function submit(RequestParameters $params)
  87      {
  88          $errno = 0;
  89          $errstr = '';
  90  
  91          if (false === $this->socket->fsockopen('ssl://' . self::RECAPTCHA_HOST, 443, $errno, $errstr, 30)) {
  92              return self::BAD_REQUEST;
  93          }
  94  
  95          $content = $params->toQueryString();
  96  
  97          $request = "POST " . self::SITE_VERIFY_PATH . " HTTP/1.1\r\n";
  98          $request .= "Host: " . self::RECAPTCHA_HOST . "\r\n";
  99          $request .= "Content-Type: application/x-www-form-urlencoded\r\n";
 100          $request .= "Content-length: " . strlen($content) . "\r\n";
 101          $request .= "Connection: close\r\n\r\n";
 102          $request .= $content . "\r\n\r\n";
 103  
 104          $this->socket->fwrite($request);
 105          $response = '';
 106  
 107          while (!$this->socket->feof()) {
 108              $response .= $this->socket->fgets(4096);
 109          }
 110  
 111          $this->socket->fclose();
 112  
 113          if (0 !== strpos($response, 'HTTP/1.1 200 OK')) {
 114              return self::BAD_RESPONSE;
 115          }
 116  
 117          $parts = preg_split("#\n\s*\n#Uis", $response);
 118  
 119          return $parts[1];
 120      }
 121  }