webservice/recaptcha.php

   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
  33 define('NO_MOODLE_COOKIES', true);
  34
  35 require_once(__DIR__ . '/../config.php');
  36
  37 $lang = optional_param('lang', '', PARAM_LANG);
  38
  39 $content = '';
  40
  41 // Check that reCAPTCHA is configured.
  42 if (!empty($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>
  88 OET;
  89 echo $output;