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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
File: qa-plugin/recaptcha-captcha/qa-recaptcha-captcha.php
Description: Captcha module for reCAPTCHA
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
class qa_recaptcha_captcha
{
private $directory;
public function load_module($directory, $urltoroot)
{
$this->directory=$directory;
}
public function admin_form()
{
$saved=false;
if (qa_clicked('recaptcha_save_button')) {
qa_opt('recaptcha_public_key', qa_post_text('recaptcha_public_key_field'));
qa_opt('recaptcha_private_key', qa_post_text('recaptcha_private_key_field'));
$saved=true;
}
$form=array(
'ok' => $saved ? 'reCAPTCHA settings saved' : null,
'fields' => array(
'public' => array(
'label' => 'reCAPTCHA public key:',
'value' => qa_opt('recaptcha_public_key'),
'tags' => 'name="recaptcha_public_key_field"',
),
'private' => array(
'label' => 'reCAPTCHA private key:',
'value' => qa_opt('recaptcha_private_key'),
'tags' => 'name="recaptcha_private_key_field"',
'error' => $this->recaptcha_error_html(),
),
),
'buttons' => array(
array(
'label' => 'Save Changes',
'tags' => 'name="recaptcha_save_button"',
),
),
);
return $form;
}
public function recaptcha_error_html()
{
if (!function_exists('fsockopen'))
return 'To use reCAPTCHA, the fsockopen() PHP function must be enabled on your server. Please check with your system administrator.';
elseif ( (!strlen(trim(qa_opt('recaptcha_public_key')))) || (!strlen(trim(qa_opt('recaptcha_private_key')))) ) {
require_once $this->directory.'recaptchalib.php';
$url=recaptcha_get_signup_url(@$_SERVER['HTTP_HOST'], qa_opt('site_title'));
return 'To use reCAPTCHA, you must <a href="'.qa_html($url).'">sign up</a> to get these keys.';
}
return null;
}
public function allow_captcha()
{
return function_exists('fsockopen') && strlen(trim(qa_opt('recaptcha_public_key'))) && strlen(trim(qa_opt('recaptcha_private_key')));
}
public function form_html(&$qa_content, $error)
{
require_once $this->directory.'recaptchalib.php';
$language=qa_opt('site_language');
if (strpos('|en|nl|fr|de|pt|ru|es|tr|', '|'.$language.'|')===false) // supported as of 3/2010
$language='en';
$qa_content['script_lines'][]=array(
"var RecaptchaOptions={",
"\ttheme:'white',",
"\tlang:".qa_js($language),
"};",
);
return recaptcha_get_html(qa_opt('recaptcha_public_key'), $error, qa_is_https_probably());
}
public function validate_post(&$error)
{
if ( (!empty($_POST['recaptcha_challenge_field'])) && (!empty($_POST['recaptcha_response_field'])) ) {
require_once $this->directory.'recaptchalib.php';
$answer=recaptcha_check_answer(
qa_opt('recaptcha_private_key'),
qa_remote_ip_address(),
$_POST['recaptcha_challenge_field'],
$_POST['recaptcha_response_field']
);
if ($answer->is_valid)
return true;
$error=@$answer->error;
}
return false;
}
}