<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* A script to display a ReCaptcha for the site.
*
* ReCaptcha V2 is restricted by domain, so it cannot be displayed in mobile and desktop apps.
*
* This script will display and initialize the reCaptcha, setting some empty callbacks by default. The client can override
* those Javascript callbacks (in the "window" object).
*
* This script won't work in mobile and desktop apps unless $CFG->allowframembedding is enabled.
*
* @package core_webservice
* @copyright 2018 Dani Palou
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define('NO_MOODLE_COOKIES', true);
require_once(__DIR__ . '/../config.php');
$lang = optional_param('lang', '', PARAM_LANG);
$content = '';
// Check that reCAPTCHA is configured.
if (!empty($CFG->recaptchapublickey) && !empty($CFG->recaptchaprivatekey)) {
require_once($CFG->libdir . '/recaptchalib_v2.php');
$apiurl = RECAPTCHA_API_URL;
$pubkey = $CFG->recaptchapublickey;
$jscode = "
// Create empty callbacks by default. They can be overridden by the client.
var recaptchacallback = function() {};
var recaptchaexpiredcallback = function() {};
var recaptchaerrorcallback = function() {};
var recaptchaloaded = function() {
grecaptcha.render('recaptcha_element', {
'sitekey' : '$pubkey',
'callback' : 'recaptchacallback',
'expired-callback' : 'recaptchaexpiredcallback',
'error-callback' : 'recaptchaerrorcallback'
});
}";
$lang = recaptcha_lang($lang);
$apicode = "\n<script type=\"text/javascript\" ";
$apicode .= "src=\"$apiurl?onload=recaptchaloaded&render=explicit&hl=$lang\" async defer>";
$apicode .= "</script>\n";
$content = html_writer::script($jscode, '');
$content .= html_writer::div('', 'recaptcha_element', array('id' => 'recaptcha_element'));
$content .= $apicode;
} else {
// To use reCAPTCHA you must have an API key.
require_once($CFG->libdir . '/filelib.php');
send_header_404();
throw new \moodle_exception('cannotusepage2');
}
$output = <<<OET
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>
<body style="margin:0; padding:0">
$content
</body>
</html>
OET;
echo $output;