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<?php
/*
Question2Answer (c) Gideon Greenspan
http://www.question2answer.org/
File: qa-include/qa-app-captcha.php
Version: See define()s at top of qa-include/qa-base.php
Description: Wrapper functions and utilities for captcha modules
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
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../');
exit;
}
function qa_captcha_available()
/*
Return whether a captcha module has been selected and it indicates that it is fully set up to go
*/
{
$module=qa_load_module('captcha', qa_opt('captcha_module'));
return isset($module) && ( (!method_exists($module, 'allow_captcha')) || $module->allow_captcha());
}
function qa_captcha_reason_note($captchareason)
/*
Return an HTML string explaining $captchareason (from qa_user_captcha_reason()) to the user about why they are seeing a captcha
*/
{
$notehtml=null;
switch ($captchareason) {
case 'login':
$notehtml=qa_insert_login_links(qa_lang_html('misc/captcha_login_fix'));
break;
case 'confirm':
$notehtml=qa_insert_login_links(qa_lang_html('misc/captcha_confirm_fix'));
break;
case 'approve':
$notehtml=qa_lang_html('misc/captcha_approve_fix');
break;
}
return $notehtml;
}
function qa_set_up_captcha_field(&$qa_content, &$fields, $errors, $note=null)
/*
Prepare $qa_content for showing a captcha, adding the element to $fields, given previous $errors, and a $note to display
*/
{
if (qa_captcha_available()) {
$captcha=qa_load_module('captcha', qa_opt('captcha_module'));
$count=@++$qa_content['qa_captcha_count']; // work around fact that reCAPTCHA can only display per page
if ($count>1)
$html='[captcha placeholder]'; // single captcha will be moved about the page, to replace this
else {
$qa_content['script_var']['qa_captcha_in']='qa_captcha_div_1';
$html=$captcha->form_html($qa_content, @$errors['captcha']);
}
$fields['captcha']=array(
'type' => 'custom',
'label' => qa_lang_html('misc/captcha_label'),
'html' => '<div id="qa_captcha_div_'.$count.'">'.$html.'</div>',
'error' => @array_key_exists('captcha', $errors) ? qa_lang_html('misc/captcha_error') : null,
'note' => $note,
);
return "if (qa_captcha_in!='qa_captcha_div_".$count."') { document.getElementById('qa_captcha_div_".$count."').innerHTML=document.getElementById(qa_captcha_in).innerHTML; document.getElementById(qa_captcha_in).innerHTML=''; qa_captcha_in='qa_captcha_div_".$count."'; }";
}
return '';
}
function qa_captcha_validate_post(&$errors)
/*
Check if captcha is submitted correctly, and if not, set $errors['captcha'] to a descriptive string
*/
{
if (qa_captcha_available()) {
$captcha=qa_load_module('captcha', qa_opt('captcha_module'));
if (!$captcha->validate_post($error)) {
$errors['captcha']=$error;
return false;
}
}
return true;
}
/*
Omit PHP closing tag to help avoid accidental output
*/