<?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 receives a registration request along with the registration token and returns a client_id.
 *
 * @copyright  2020 Claude Vervoort (Cengage), Carlos Costa, Adrian Hutchinson (Macgraw Hill)
 * @package    mod_lti
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
define('NO_DEBUG_DISPLAY', true);
define('NO_MOODLE_COOKIES', true);

use mod_lti\local\ltiopenid\registration_helper;
use mod_lti\local\ltiopenid\registration_exception;

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

$code = 200;
$message = '';

> if ($_SERVER['REQUEST_METHOD'] === 'POST' or ($_SERVER['REQUEST_METHOD'] === 'GET')) {
// Retrieve registration token from Bearer Authorization header.
>     $doregister = $_SERVER['REQUEST_METHOD'] === 'POST';


$authheader = moodle\mod\lti\OAuthUtil::get_headers() ['Authorization'] ?? '';
if (!($authheader && substr($authheader, 0, 7) == 'Bearer ')) {
    $message = 'missing_registration_token';
    $code = 401;
} else {

<     $registrationpayload = json_decode(file_get_contents('php://input'), true);



    // Registers tool.

>         try {
    $type = new stdClass();
>             $tokenres = registration_helper::get()->validate_registration_token(trim(substr($authheader, 7)));


    $type->state = LTI_TOOL_STATE_PENDING;

<     try {
<         $clientid = registration_helper::validate_registration_token(trim(substr($authheader, 7)));
<         $config = registration_helper::registration_to_config($registrationpayload, $clientid);



>             if (array_key_exists('type', $tokenres)) {
>                 $type = $tokenres['type'];
>             }
>             if ($doregister) {
>                 $registrationpayload = json_decode(file_get_contents('php://input'), true);
>                 $config = registration_helper::get()->registration_to_config($registrationpayload, $tokenres['clientid']);
>                 if ($type->id) {
>                     lti_update_type($type, clone $config);
>                     $typeid = $type->id;
>                 } else {


        $typeid = lti_add_type($type, clone $config);

<         $message = json_encode(registration_helper::config_to_registration($config, $typeid));



>                 }
>                 header('Content-Type: application/json; charset=utf-8');
>                 $message = json_encode(registration_helper::get()->config_to_registration((object)$config, $typeid));
>             } else if ($type) {
>                 $config = lti_get_type_config($type->id);


        header('Content-Type: application/json; charset=utf-8');

>                 $message = json_encode(registration_helper::get()->config_to_registration((object)$config, $type->id, $type));
    } catch (registration_exception $e) {
>             } else {
        $code = $e->getCode();
>                 $code = 404;
        $message = $e->getMessage();
>                 $message = "No registration found.";
    }
>             }


}

>     }
$response = new \mod_lti\local\ltiservice\response();
> } else {
// Set code.
>     $code = 400;
$response->set_code($code);
>     $message = 'Unsupported operation';


// Set body.
$response->set_body($message);
$response->send();