mod/lti/certs.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  * This file returns an array of available public keys
  19  *
  20  * @package    mod_lti
  21  * @copyright  2019 Stephen Vickers
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 define('NO_DEBUG_DISPLAY', true);
  26 define('NO_MOODLE_COOKIES', true);
  27
  28 require_once(__DIR__ . '/../../config.php');
  29
  30 $jwks = array('keys' => array());
  31
  32 $privatekey = get_config('mod_lti', 'privatekey');
  33 $res = openssl_pkey_get_private($privatekey);
  34 $details = openssl_pkey_get_details($res);
  35
  36 $jwk = array();
  37 $jwk['kty'] = 'RSA';
  38 $jwk['alg'] = 'RS256';
  39 $jwk['kid'] = get_config('mod_lti', 'kid');
  40 $jwk['e'] = rtrim(strtr(base64_encode($details['rsa']['e']), '+/', '-_'), '=');
  41 $jwk['n'] = rtrim(strtr(base64_encode($details['rsa']['n']), '+/', '-_'), '=');
  42 $jwk['use'] = 'sig';
  43
  44 $jwks['keys'][] = $jwk;
  45
  46 @header('Content-Type: application/json; charset=utf-8');
  47
  48 echo json_encode($jwks, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);