<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/*
* This is a PHP library that handles calling reCAPTCHA.
* - Documentation and latest version
* http://recaptcha.net/plugins/php/
* - Get a reCAPTCHA API Key
* http://recaptcha.net/api/getkey
* - Discussion group
* http://groups.google.com/group/recaptcha
*
* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
* AUTHORS:
* Mike Crawford
* Ben Maurer
*
* 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.
*/
/**
* Recaptcha modified to integrate easily with Code Igniter
*
* @package CodeIgniter
* @subpackage Libraries
* @category Captcha
* @author Jon Trelfa <hide@address.com>
* @link none yet
*/
class Recaptcha {
//private
var $_rConfig;
var $_ci;
//public
var $is_valid;
var $error;
//set the default URLs for using Recaptcha
function __construct() {
log_message('debug', 'Recaptcha class Initialized');
$this->_ci =& get_instance();
$this->_ci->config->load('recaptcha');
$this->_rConfig = $this->_ci->config->item('recaptcha');
$this->is_valid = false;
$this->error = '';
}
/**
* Encodes the given data into a query string format
* @param $data - array of string elements to be encoded
* @return string - encoded request
*/
function _recaptcha_qsencode($data) {
return http_build_query($data);
}
/**
* Submits an HTTP POST to a reCAPTCHA server
* @param string $host
* @param string $path
* @param array $data
* @param int port
* @return array response
*/
function _recaptcha_http_post($host, $path, $data, $port = 80) {
$req = $this->_recaptcha_qsencode($data);
$http_request = implode('',array(
"POST $path HTTP/1.0\r\n",
"Host: $host\r\n",
"Content-Type: application/x-www-form-urlencoded;\r\n",
"Content-Length:".strlen($req)."\r\n",
"User-Agent: reCAPTCHA/PHP\r\n",
"\r\n",
$req));
$response = '';
if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
show_error('Could not open socket');
}
fwrite($fs, $http_request);
while (!feof($fs)) {
$response .= fgets($fs, 1160); // One TCP-IP packet
}
fclose($fs);
$response = explode("\r\n\r\n", $response, 2);
return $response;
}
/**
* Gets the challenge HTML (javascript and non-javascript version).
* This is called from the browser, and the resulting reCAPTCHA HTML widget
* is embedded within the HTML form it was called from.
* @param string $pubkey A public key for reCAPTCHA
* @param string $error The error given by reCAPTCHA (optional, default is null)
* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
* @return string - The HTML to be embedded in the user's form.
*/
function recaptcha_get_html ($error = null, $use_ssl = false) {
if ($this->_rConfig['public'] == '') {
show_error("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
}
if ($use_ssl) {
$server = $this->_rConfig['RECAPTCHA_API_SECURE_SERVER'];
} else {
$server = $this->_rConfig['RECAPTCHA_API_SERVER'];
}
$errorpart = "";
if ($error) {
$errorpart = "&error=" . $error;
}
$data = array(
'server'=>$server,
'key'=>$this->_rConfig['public'],
'theme'=>$this->_rConfig['theme'],
'errorpart'=>$errorpart
);
return $this->_ci->load->view('recaptcha',$data,true);
}
/**
* gets a URL where the user can sign up for reCAPTCHA. If your application
* has a configuration page where you enter a key, you should provide a link
* using this function.
* @param string $domain The domain where the page is hosted
* @param string $appname The name of your application
*/
function recaptcha_get_signup_url ($domain = null, $appname = null) {
return "http://recaptcha.net/api/getkey?".$this->_recaptcha_qsencode(array ('domain' => $domain, 'app' => $appname));
}
/**
* Calls an HTTP POST function to verify if the user's guess was correct
* @param string $privkey
* @param string $remoteip
* @param string $challenge
* @param string $response
* @param array $extra_params an array of extra variables to post to the server
* @return ReCaptchaResponse
*/
function recaptcha_check_answer ($remoteip, $challenge, $response, $extra_params = array()) {
if ($this->_rConfig['private'] == '') {
die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
}
if ($remoteip == null || $remoteip == '') {
show_error("For security reasons, you must pass the remote ip to reCAPTCHA");
}
//discard spam submissions
if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
$this->is_valid = false;
$this->error = 'incorrect-captcha-sol';
return;
}
$response = $this->_recaptcha_http_post(
$this->_rConfig['RECAPTCHA_VERIFY_SERVER'],
"/verify",
array (
'privatekey' => $this->_rConfig['private'],
'remoteip' => $remoteip,
'challenge' => $challenge,
'response' => $response
) + $extra_params
);
//show_error($response);
$answers = explode ("\n", $response [1]);
if (trim ($answers [0]) == 'true') {
$this->is_valid = true;
} else {
$this->is_valid = false;
$this->error = $answers [1];
}
return;
}
}
?>