<?php
/**
*
* @package VC
* @version $Id$
* @copyright (c) 2006, 2008 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
if (!class_exists('phpbb_default_captcha'))
{
// we need the classic captcha code for tracking solutions and attempts
include($phpbb_root_path . 'includes/captcha/plugins/captcha_abstract.' . $phpEx);
}
/**
* @package VC
*/
class phpbb_recaptcha extends phpbb_default_captcha
{
var $recaptcha_server = 'http://www.google.com/recaptcha/api';
var $recaptcha_server_secure = 'https://www.google.com/recaptcha/api'; // class constants :(
// We are opening a socket to port 80 of this host and send
// the POST request asking for verification to the path specified here.
var $recaptcha_verify_server = 'www.google.com';
var $recaptcha_verify_path = '/recaptcha/api/verify';
var $challenge;
var $response;
// PHP4 Constructor
function phpbb_recaptcha()
{
$this->recaptcha_server = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? $this->recaptcha_server_secure : $this->recaptcha_server;
}
function init($type)
{
global $config, $db, $user;
$user->add_lang('captcha_recaptcha');
parent::init($type);
$this->challenge = request_var('recaptcha_challenge_field', '');
$this->response = request_var('recaptcha_response_field', '');
}
function &get_instance()
{
$instance =& new phpbb_recaptcha();
return $instance;
}
function is_available()
{
global $config, $user;
$user->add_lang('captcha_recaptcha');
return (isset($config['recaptcha_pubkey']) && !empty($config['recaptcha_pubkey']));
}
/**
* API function
*/
function has_config()
{
return true;
}
function get_name()
{
return 'CAPTCHA_RECAPTCHA';
}
function get_class_name()
{
return 'phpbb_recaptcha';
}
function acp_page($id, &$module)
{
global $config, $db, $template, $user;
$captcha_vars = array(
'recaptcha_pubkey' => 'RECAPTCHA_PUBKEY',
'recaptcha_privkey' => 'RECAPTCHA_PRIVKEY',
);
$module->tpl_name = 'captcha_recaptcha_acp';
$module->page_title = 'ACP_VC_SETTINGS';
$form_key = 'acp_captcha';
add_form_key($form_key);
$submit = request_var('submit', '');
if ($submit && check_form_key($form_key))
{
$captcha_vars = array_keys($captcha_vars);
foreach ($captcha_vars as $captcha_var)
{
$value = request_var($captcha_var, '');
if ($value)
{
set_config($captcha_var, $value);
}
}
add_log('admin', 'LOG_CONFIG_VISUAL');
trigger_error($user->lang['CONFIG_UPDATED'] . adm_back_link($module->u_action));
}
else if ($submit)
{
trigger_error($user->lang['FORM_INVALID'] . adm_back_link($module->u_action));
}
else
{
foreach ($captcha_vars as $captcha_var => $template_var)
{
$var = (isset($_REQUEST[$captcha_var])) ? request_var($captcha_var, '') : ((isset($config[$captcha_var])) ? $config[$captcha_var] : '');
$template->assign_var($template_var, $var);
}
$template->assign_vars(array(
'CAPTCHA_PREVIEW' => $this->get_demo_template($id),
'CAPTCHA_NAME' => $this->get_class_name(),
'U_ACTION' => $module->u_action,
));
}
}
// not needed
function execute_demo()
{
}
// not needed
function execute()
{
}
function get_template()
{
global $config, $user, $template;
if ($this->is_solved())
{
return false;
}
else
{
$explain = $user->lang(($this->type != CONFIRM_POST) ? 'CONFIRM_EXPLAIN' : 'POST_CONFIRM_EXPLAIN', '<a href="mailto:' . htmlspecialchars($config['board_contact']) . '">', '</a>');
$template->assign_vars(array(
'RECAPTCHA_SERVER' => $this->recaptcha_server,
'RECAPTCHA_PUBKEY' => isset($config['recaptcha_pubkey']) ? $config['recaptcha_pubkey'] : '',
'RECAPTCHA_ERRORGET' => '',
'S_RECAPTCHA_AVAILABLE' => $this->is_available(),
'S_CONFIRM_CODE' => true,
'S_TYPE' => $this->type,
'L_CONFIRM_EXPLAIN' => $explain,
));
return 'captcha_recaptcha.html';
}
}
function get_demo_template($id)
{
return $this->get_template();
}
function get_hidden_fields()
{
$hidden_fields = array();
// this is required for posting.php - otherwise we would forget about the captcha being already solved
if ($this->solved)
{
$hidden_fields['confirm_code'] = $this->code;
}
$hidden_fields['confirm_id'] = $this->confirm_id;
return $hidden_fields;
}
function uninstall()
{
$this->garbage_collect(0);
}
function install()
{
return;
}
function validate()
{
if (!parent::validate())
{
return false;
}
else
{
return $this->recaptcha_check_answer();
}
}
// Code from here on is based on recaptchalib.php
/*
* 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.
*/
/**
* 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 = "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/phpBB\r\n";
$http_request .= "\r\n";
$http_request .= $req;
$response = '';
if (false == ($fs = @fsockopen($host, $port, $errno, $errstr, 10)))
{
trigger_error('Could not open socket', E_USER_ERROR);
}
fwrite($fs, $http_request);
while (!feof($fs))
{
// One TCP-IP packet
$response .= fgets($fs, 1160);
}
fclose($fs);
$response = explode("\r\n\r\n", $response, 2);
return $response;
}
/**
* Calls an HTTP POST function to verify if the user's guess was correct
* @param array $extra_params an array of extra variables to post to the server
* @return ReCaptchaResponse
*/
function recaptcha_check_answer($extra_params = array())
{
global $config, $user;
//discard spam submissions
if ($this->challenge == null || strlen($this->challenge) == 0 || $this->response == null || strlen($this->response) == 0)
{
return $user->lang['RECAPTCHA_INCORRECT'];
}
$response = $this->_recaptcha_http_post($this->recaptcha_verify_server, $this->recaptcha_verify_path,
array(
'privatekey' => $config['recaptcha_privkey'],
'remoteip' => $user->ip,
'challenge' => $this->challenge,
'response' => $this->response
) + $extra_params
);
$answers = explode("\n", $response[1]);
if (trim($answers[0]) === 'true')
{
$this->solved = true;
return false;
}
else
{
return $user->lang['RECAPTCHA_INCORRECT'];
}
}
/**
* 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)
{
$req = '';
foreach ($data as $key => $value)
{
$req .= $key . '=' . urlencode(stripslashes($value)) . '&';
}
// Cut the last '&'
$req = substr($req, 0, strlen($req) - 1);
return $req;
}
}
?>