SocketPost.php in reCAPTCHA 6.2

Namespace

ReCaptcha\RequestMethod

File

recaptcha-php/src/ReCaptcha/RequestMethod/SocketPost.php

<?php

/**
 * This is a PHP library that handles calling reCAPTCHA.
 *
 * @copyright Copyright (c) 2015, Google Inc.
 * @link      http://www.google.com/recaptcha
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
namespace ReCaptcha\RequestMethod;

use ReCaptcha\RequestMethod;
use ReCaptcha\RequestParameters;

/**
 * Sends a POST request to the reCAPTCHA service, but makes use of fsockopen()
 * instead of get_file_contents(). This is to account for people who may be on
 * servers where allow_furl_open is disabled.
 */
class SocketPost implements RequestMethod {

  /**
   * reCAPTCHA service host.
   * @const string
   */
  const RECAPTCHA_HOST = 'www.google.com';

  /**
   * @const string reCAPTCHA service path
   */
  const SITE_VERIFY_PATH = '/recaptcha/api/siteverify';

  /**
   * @const string Bad request error
   */
  const BAD_REQUEST = '{"success": false, "error-codes": ["invalid-request"]}';

  /**
   * @const string Bad response error
   */
  const BAD_RESPONSE = '{"success": false, "error-codes": ["invalid-response"]}';

  /**
   * Socket to the reCAPTCHA service
   * @var Socket
   */
  private $socket;

  /**
   * Constructor
   *
   * @param \ReCaptcha\RequestMethod\Socket $socket optional socket, injectable for testing
   */
  public function __construct(Socket $socket = null) {
    if (!is_null($socket)) {
      $this->socket = $socket;
    }
    else {
      $this->socket = new Socket();
    }
  }

  /**
   * Submit the POST request with the specified parameters.
   *
   * @param RequestParameters $params Request parameters
   * @return string Body of the reCAPTCHA response
   */
  public function submit(RequestParameters $params) {
    $errno = 0;
    $errstr = '';
    if (false === $this->socket
      ->fsockopen('ssl://' . self::RECAPTCHA_HOST, 443, $errno, $errstr, 30)) {
      return self::BAD_REQUEST;
    }
    $content = $params
      ->toQueryString();
    $request = "POST " . self::SITE_VERIFY_PATH . " HTTP/1.1\r\n";
    $request .= "Host: " . self::RECAPTCHA_HOST . "\r\n";
    $request .= "Content-Type: application/x-www-form-urlencoded\r\n";
    $request .= "Content-length: " . strlen($content) . "\r\n";
    $request .= "Connection: close\r\n\r\n";
    $request .= $content . "\r\n\r\n";
    $this->socket
      ->fwrite($request);
    $response = '';
    while (!$this->socket
      ->feof()) {
      $response .= $this->socket
        ->fgets(4096);
    }
    $this->socket
      ->fclose();
    if (0 !== strpos($response, 'HTTP/1.1 200 OK')) {
      return self::BAD_RESPONSE;
    }
    $parts = preg_split("#\n\\s*\n#Uis", $response);
    return $parts[1];
  }

}

Classes

Name	Description
SocketPost	Sends a POST request to the reCAPTCHA service, but makes use of fsockopen() instead of get_file_contents(). This is to account for people who may be on servers where allow_furl_open is disabled.