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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* A script to display a ReCaptcha for the site.
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*
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* ReCaptcha V2 is restricted by domain, so it cannot be displayed in mobile and desktop apps.
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*
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* This script will display and initialize the reCaptcha, setting some empty callbacks by default. The client can override
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* those Javascript callbacks (in the "window" object).
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*
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* This script won't work in mobile and desktop apps unless $CFG->allowframembedding is enabled.
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*
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* @package core_webservice
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* @copyright 2018 Dani Palou
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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define('NO_MOODLE_COOKIES', true);
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require_once(__DIR__ . '/../config.php');
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$lang = optional_param('lang', '', PARAM_LANG);
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$content = '';
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// Check that reCAPTCHA is configured.
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if (!empty($CFG->recaptchapublickey) && !empty($CFG->recaptchaprivatekey)) {
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require_once($CFG->libdir . '/recaptchalib_v2.php');
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$apiurl = RECAPTCHA_API_URL;
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$pubkey = $CFG->recaptchapublickey;
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$jscode = "
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// Create empty callbacks by default. They can be overridden by the client.
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var recaptchacallback = function() {};
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var recaptchaexpiredcallback = function() {};
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var recaptchaerrorcallback = function() {};
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var recaptchaloaded = function() {
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grecaptcha.render('recaptcha_element', {
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'sitekey' : '$pubkey',
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'callback' : 'recaptchacallback',
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'expired-callback' : 'recaptchaexpiredcallback',
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'error-callback' : 'recaptchaerrorcallback'
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});
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}";
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$lang = recaptcha_lang($lang);
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$apicode = "\n<script type=\"text/javascript\" ";
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$apicode .= "src=\"$apiurl?onload=recaptchaloaded&render=explicit&hl=$lang\" async defer>";
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$apicode .= "</script>\n";
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$content = html_writer::script($jscode, '');
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$content .= html_writer::div('', 'recaptcha_element', array('id' => 'recaptcha_element'));
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$content .= $apicode;
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} else {
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// To use reCAPTCHA you must have an API key.
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require_once($CFG->libdir . '/filelib.php');
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send_header_404();
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throw new \moodle_exception('cannotusepage2');
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}
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$output = <<<OET
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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</head>
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<body style="margin:0; padding:0">
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$content
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</body>
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</html>
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OET;
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echo $output;
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