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<?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/>.
/**
* This file returns an array of available public keys
*
* @package mod_lti
* @copyright 2019 Stephen Vickers
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define('NO_DEBUG_DISPLAY', true);
define('NO_MOODLE_COOKIES', true);
require_once(__DIR__ . '/../../config.php');
$jwks = array('keys' => array());
$privatekey = get_config('mod_lti', 'privatekey');
$res = openssl_pkey_get_private($privatekey);
$details = openssl_pkey_get_details($res);
$jwk = array();
$jwk['kty'] = 'RSA';
$jwk['alg'] = 'RS256';
$jwk['kid'] = get_config('mod_lti', 'kid');
$jwk['e'] = rtrim(strtr(base64_encode($details['rsa']['e']), '+/', '-_'), '=');
$jwk['n'] = rtrim(strtr(base64_encode($details['rsa']['n']), '+/', '-_'), '=');
$jwk['use'] = 'sig';
$jwks['keys'][] = $jwk;
@header('Content-Type: application/json; charset=utf-8');
echo json_encode($jwks, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);