$Id$
| > $Revision: 128 $
| > $Date: 2006-01-20 12:46:26 +0000 (Fri, 20 Jan 2006) $
+---------------------------------------------------------------------------
|
| > CAPTCHA ANTI-SPAM CLASS
| > Script written by Matt Mecham
| > Date started: Thursday 2 February (11:08)
|
+---------------------------------------------------------------------------
*/
/**
* CAPTCHA CLASS
* PLUG IN: Default GD image
* @package IPDYNAMIC
* @author Matt Mecham
* @copyright Invision Power Services, Inc.
* @version 1.0
*/
/*
* 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.
*/
/**
* The reCAPTCHA server URL's
*/
define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
class captchaPlugin
{
/**
* Global IPS class array
* @var object
*/
var $ipsclass;
/**
* Error string
* @var string
*/
var $error_string = '';
/**
* Constructor bah to PHP 4
*
* @param object IPSClass object
* @param string Captcha plug-in to use
*/
function captchaPlugin( $ipsclass )
{
$this->ipsclass =& $ipsclass;
$this->public_key = $this->ipsclass->vars['recaptcha_public_key'];
$this->private_key = $this->ipsclass->vars['recaptcha_private_key'];
$this->useSSL = false; //$this->ipsclass->vars['logins_over_https']; - IPB3 feature...shhhh ;) :P
}
/*-------------------------------------------------------------------------*/
// Initializes captcha session
/*-------------------------------------------------------------------------*/
/**
* Initializes captcha session
* Clears out "dead" entries, adds new row and returns
* unique ID for use in an image
*
* @return string HTML
*/
function getTemplate()
{
if ( ! $this->public_key )
{
return '';
}
if ($this->useSSL)
{
$server = RECAPTCHA_API_SECURE_SERVER;
}
else
{
$server = RECAPTCHA_API_SERVER;
}
$html = '';
if( $this->ipsclass->vars['recaptcha_language'] )
{
$html .= "";
}
$html .= '
';
//-----------------------------------------
// Return Template Bit
//-----------------------------------------
return $this->ipsclass->compiled_templates['skin_global']->captchaRecaptcha( $html );
}
/*-------------------------------------------------------------------------*/
// Captcha validate
/*-------------------------------------------------------------------------*/
/**
* Show the captcha bot image
*
* @return void
* @since 1.0
*/
function validate()
{
if ( !$this->private_key )
{
return '';
}
$captcha_unique_id = $_REQUEST['recaptcha_challenge_field'];
$captcha_input = $_REQUEST['recaptcha_response_field'];
if ( $captcha_input == null || strlen($captcha_input) == 0 || $captcha_unique_id == null || strlen($captcha_unique_id) == 0)
{
return false;
}
$response = $this->_recaptchaPost( RECAPTCHA_VERIFY_SERVER, "/verify",
array (
'privatekey' => $this->private_key,
'remoteip' => $this->ipsclass->ip_address,
'challenge' => $captcha_unique_id,
'response' => $captcha_input
)
);
$answers = explode( "\n", $response [1] );
if ( trim ($answers [0]) == 'true' )
{
return TRUE;
}
else
{
return FALSE;
}
}
/**
* 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.
*
* @access public
* @param string $domain The domain where the page is hosted
* @param string $appname The name of your application
*/
function getSignupUrl( $domain = null, $appname = null )
{
return "http://recaptcha.net/api/getkey?" . $this->_encodeQueryString( array( 'domain' => $domain, 'app' => $appname ) );
}
/**
* Submits an HTTP POST to a reCAPTCHA server
*
* @access private
* @param string $host
* @param string $path
* @param array $data
* @param int port
* @return array response
*/
function _recaptchaPost( $host, $path, $data, $port = 80 )
{
$req = $this->_encodeQueryString( $data );
$http_request = "POST $path HTTP/1.0\r\n";
$http_request .= "Host: $host\r\n";
$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
$http_request .= "Content-Length: " . strlen($req) . "\r\n";
$http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
$http_request .= "\r\n";
$http_request .= $req;
$response = '';
if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) )
{
return false;
}
fwrite($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;
}
/**
* Encode array of data into a query string
*
* @access private
* @param array $data
* @return string query string
*/
function _encodeQueryString( $data )
{
$req = "";
foreach ( $data as $key => $value )
{
$req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
}
// Cut the last '&'
$req = substr( $req, 0, strlen($req)-1 );
return $req;
}
}
?>