weekly release 3.10.1+
[moodle.git] / webservice / recaptcha.php
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f72ca3ce
DP
1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17
18/**
19 * A script to display a ReCaptcha for the site.
20 *
21 * ReCaptcha V2 is restricted by domain, so it cannot be displayed in mobile and desktop apps.
22 *
23 * This script will display and initialize the reCaptcha, setting some empty callbacks by default. The client can override
24 * those Javascript callbacks (in the "window" object).
25 *
26 * This script won't work in mobile and desktop apps unless $CFG->allowframembedding is enabled.
27 *
28 * @package core_webservice
29 * @copyright 2018 Dani Palou
30 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
31 */
32
33define('NO_MOODLE_COOKIES', true);
34
35require_once(__DIR__ . '/../config.php');
36
37$lang = optional_param('lang', '', PARAM_LANG);
38
39$content = '';
40
41// Check that reCAPTCHA is configured.
42if (!empty($CFG->recaptchapublickey) && !empty($CFG->recaptchaprivatekey)) {
43 require_once($CFG->libdir . '/recaptchalib_v2.php');
44
45 $apiurl = RECAPTCHA_API_URL;
46 $pubkey = $CFG->recaptchapublickey;
47
48 $jscode = "
49 // Create empty callbacks by default. They can be overridden by the client.
50 var recaptchacallback = function() {};
51 var recaptchaexpiredcallback = function() {};
52 var recaptchaerrorcallback = function() {};
53
54 var recaptchaloaded = function() {
55 grecaptcha.render('recaptcha_element', {
56 'sitekey' : '$pubkey',
57 'callback' : 'recaptchacallback',
58 'expired-callback' : 'recaptchaexpiredcallback',
59 'error-callback' : 'recaptchaerrorcallback'
60 });
61 }";
62
63 $lang = recaptcha_lang($lang);
64
65 $apicode = "\n<script type=\"text/javascript\" ";
66 $apicode .= "src=\"$apiurl?onload=recaptchaloaded&render=explicit&hl=$lang\" async defer>";
67 $apicode .= "</script>\n";
68
69 $content = html_writer::script($jscode, '');
70 $content .= html_writer::div('', 'recaptcha_element', array('id' => 'recaptcha_element'));
71 $content .= $apicode;
72} else {
73 // To use reCAPTCHA you must have an API key.
74 require_once($CFG->libdir . '/filelib.php');
75 send_header_404();
76 print_error('cannotusepage2');
77}
78
79$output = <<<OET
80<html>
81 <head>
82 <meta http-equiv="content-type" content="text/html; charset=utf-8" />
83 </head>
84 <body style="margin:0; padding:0">
85 $content
86 </body>
87</html>
88OET;
89echo $output;