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<?php
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/*
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+---------------------------------------------------------------------------
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| Invision Power Dynamic v1.0.0
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| ========================================
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| by Matthew Mecham
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| (c) 2004 Invision Power Services
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| http://www.invisionpower.com
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| ========================================
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+---------------------------------------------------------------------------
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| INVISION POWER DYNAMIC IS NOT FREE SOFTWARE!
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| http://www.invisionpower.com/dynamic/
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+---------------------------------------------------------------------------
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| > $Id$
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| > $Revision: 128 $
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| > $Date: 2006-01-20 12:46:26 +0000 (Fri, 20 Jan 2006) $
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+---------------------------------------------------------------------------
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|
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| > CAPTCHA ANTI-SPAM CLASS
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| > Script written by Matt Mecham
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| > Date started: Thursday 2 February (11:08)
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+---------------------------------------------------------------------------
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*/
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/**
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* CAPTCHA CLASS
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* PLUG IN: Default GD image
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* @package IPDYNAMIC
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* @author Matt Mecham
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* @copyright Invision Power Services, Inc.
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* @version 1.0
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*/
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/*
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* This is a PHP library that handles calling reCAPTCHA.
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* - Documentation and latest version
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* http://recaptcha.net/plugins/php/
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* - Get a reCAPTCHA API Key
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* http://recaptcha.net/api/getkey
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* - Discussion group
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* http://groups.google.com/group/recaptcha
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*
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* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
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* AUTHORS:
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* Mike Crawford
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* Ben Maurer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* The reCAPTCHA server URL's
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*/
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define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
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define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
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define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
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class captchaPlugin
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{
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/**
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* Global IPS class array
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* @var object
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*/
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var $ipsclass;
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/**
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* Error string
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* @var string
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*/
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var $error_string = '';
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/**
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* Constructor bah to PHP 4
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*
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* @param object IPSClass object
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* @param string Captcha plug-in to use
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*/
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function captchaPlugin( $ipsclass )
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{
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$this->ipsclass =& $ipsclass;
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$this->public_key = $this->ipsclass->vars['recaptcha_public_key'];
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$this->private_key = $this->ipsclass->vars['recaptcha_private_key'];
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$this->useSSL = false; //$this->ipsclass->vars['logins_over_https']; - IPB3 feature...shhhh ;) :P
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}
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/*-------------------------------------------------------------------------*/
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// Initializes captcha session
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/*-------------------------------------------------------------------------*/
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/**
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* Initializes captcha session
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* Clears out "dead" entries, adds new row and returns
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* unique ID for use in an image
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*
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* @return string HTML
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*/
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function getTemplate()
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{
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if ( ! $this->public_key )
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{
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return '';
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}
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if ($this->useSSL)
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{
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$server = RECAPTCHA_API_SECURE_SERVER;
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}
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else
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{
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$server = RECAPTCHA_API_SERVER;
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}
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$html = '';
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if( $this->ipsclass->vars['recaptcha_language'] )
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{
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$html .= "<script type='text/javascript'>var RecaptchaOptions = { lang : '{$this->ipsclass->vars['recaptcha_language']}' };</script>";
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}
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$html .= '<script type="text/javascript" src="'. $server . '/challenge?k=' . $this->public_key . '"></script>
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<noscript>
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<iframe src="'. $server . '/noscript?k=' . $this->public_key . '" height="300" width="500" frameborder="0"></iframe><br/>
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<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
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<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
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</noscript>';
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//-----------------------------------------
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// Return Template Bit
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//-----------------------------------------
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return $this->ipsclass->compiled_templates['skin_global']->captchaRecaptcha( $html );
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}
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/*-------------------------------------------------------------------------*/
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// Captcha validate
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/*-------------------------------------------------------------------------*/
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/**
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* Show the captcha bot image
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*
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* @return void
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* @since 1.0
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*/
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function validate()
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{
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if ( !$this->private_key )
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{
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return '';
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}
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$captcha_unique_id = $_REQUEST['recaptcha_challenge_field'];
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$captcha_input = $_REQUEST['recaptcha_response_field'];
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if ( $captcha_input == null || strlen($captcha_input) == 0 || $captcha_unique_id == null || strlen($captcha_unique_id) == 0)
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{
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return false;
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}
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$response = $this->_recaptchaPost( RECAPTCHA_VERIFY_SERVER, "/verify",
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array (
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'privatekey' => $this->private_key,
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'remoteip' => $this->ipsclass->ip_address,
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'challenge' => $captcha_unique_id,
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'response' => $captcha_input
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)
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);
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$answers = explode( "\n", $response [1] );
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if ( trim ($answers [0]) == 'true' )
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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/**
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* Gets a URL where the user can sign up for reCAPTCHA. If your application
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* has a configuration page where you enter a key, you should provide a link
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* using this function.
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*
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* @access public
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* @param string $domain The domain where the page is hosted
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* @param string $appname The name of your application
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*/
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function getSignupUrl( $domain = null, $appname = null )
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{
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return "http://recaptcha.net/api/getkey?" . $this->_encodeQueryString( array( 'domain' => $domain, 'app' => $appname ) );
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}
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/**
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* Submits an HTTP POST to a reCAPTCHA server
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*
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* @access private
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* @param string $host
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* @param string $path
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* @param array $data
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* @param int port
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* @return array response
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*/
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function _recaptchaPost( $host, $path, $data, $port = 80 )
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{
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$req = $this->_encodeQueryString( $data );
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$http_request = "POST $path HTTP/1.0\r\n";
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$http_request .= "Host: $host\r\n";
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$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
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$http_request .= "Content-Length: " . strlen($req) . "\r\n";
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$http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
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$http_request .= "\r\n";
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$http_request .= $req;
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$response = '';
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if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) )
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{
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return false;
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}
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fwrite($fs, $http_request);
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while ( !feof($fs) )
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{
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$response .= fgets($fs, 1160); // One TCP-IP packet
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}
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fclose($fs);
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$response = explode( "\r\n\r\n", $response, 2 );
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return $response;
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}
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/**
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* Encode array of data into a query string
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*
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* @access private
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* @param array $data
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* @return string query string
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*/
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function _encodeQueryString( $data )
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{
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$req = "";
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foreach ( $data as $key => $value )
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{
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$req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
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}
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// Cut the last '&'
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$req = substr( $req, 0, strlen($req)-1 );
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return $req;
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}
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}
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?>
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