<?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/>.

/**
 * Redirect the user to registration with token and openid config url as query params.
 *
 * @package mod_lti
 * @copyright  2020 Cengage
 * @author     Claude Vervoort
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

use Firebase\JWT\JWT;

use mod_lti\local\ltiopenid\jwks_helper;

> use mod_lti\local\ltiopenid\registration_helper;



require_once(__DIR__ . '/../../config.php');
require_once($CFG->libdir.'/weblib.php');

> require_once($CFG->dirroot . '/mod/lti/locallib.php');



require_login();
$context = context_system::instance();
require_capability('moodle/site:config', $context);

$starturl = required_param('url', PARAM_URL);

> $typeid = optional_param('type', -1, PARAM_INT);
$now = time();
> 
$token = [
> $types = lti_get_tools_by_url($starturl, null);
    "sub" => random_string(15),
> 
    "scope" => "reg",
> if (!empty($types) && $typeid == -1) {
    "iat" => $now,
>     // There are matching types for the registration domain, let's prompt the user to upgrade.
    "exp" => $now + HOURSECS
>     $pageurl = new moodle_url('/mod/lti/startltiadvregistration.php');
];
>     $PAGE->set_context($context);
$privatekey = jwks_helper::get_private_key();
>     $PAGE->set_url($pageurl);
$regtoken = JWT::encode($token, $privatekey['key'], 'RS256', $privatekey['kid']);
>     $PAGE->set_pagelayout('maintenance');
$confurl = new moodle_url('/mod/lti/openid-configuration.php');
>     $output = $PAGE->get_renderer('mod_lti');
$url = new moodle_url($starturl);
>     $page = new \mod_lti\output\registration_upgrade_choice_page($types, $starturl);
$url->param('openid_configuration', $confurl->out(false));
>     echo $output->header();
$url->param('registration_token', $regtoken);
>     echo $output->render($page);
header("Location: ".$url->out(false));
>     echo $output->footer();
> } else {
>     // Let's actually start the registration process by launching the tool registration
>     // endpoint with the registration token and the site config url.
>     require_sesskey();
>     $sub = registration_helper::get()->new_clientid();
>     $scope = registration_helper::REG_TOKEN_OP_NEW_REG;
>     if ($typeid > 0) {
>         // In the context of an update, the sub is the id of the type.
>         $sub = strval($typeid);
>         $scope = registration_helper::REG_TOKEN_OP_UPDATE_REG;
>     }



<     "sub" => random_string(15),
<     "scope" => "reg",



>         "sub" => $sub,
>         "scope" => $scope,



> }