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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 contains a service for issuing access tokens
 *
 * @package    mod_lti
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('NO_DEBUG_DISPLAY', true);
define('NO_MOODLE_COOKIES', true);

use Firebase\JWT\JWT as JWT;

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

$response = new \mod_lti\local\ltiservice\response();

$contenttype = isset($_SERVER['CONTENT_TYPE']) ? explode(';', $_SERVER['CONTENT_TYPE'], 2)[0] : '';

$ok = ($_SERVER['REQUEST_METHOD'] === 'POST') && ($contenttype === 'application/x-www-form-urlencoded');
$error = 'invalid_request';

$clientassertion = optional_param('client_assertion', '', PARAM_TEXT);
$clientassertiontype = optional_param('client_assertion_type', '', PARAM_TEXT);
$granttype = optional_param('grant_type', '', PARAM_TEXT);
$scope = optional_param('scope', '', PARAM_TEXT);

if ($ok) {
    $ok = !empty($clientassertion) && !empty($clientassertiontype) &&
          !empty($granttype) && !empty($scope);
}

if ($ok) {
    $ok = ($clientassertiontype === 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer') &&
          ($granttype === 'client_credentials');
    $error = 'unsupported_grant_type';
}

if ($ok) {
    $parts = explode('.', $clientassertion);
    $ok = (count($parts) === 3);
    if ($ok) {
        $payload = JWT::urlsafeB64Decode($parts[1]);
        $claims = json_decode($payload, true);
        $ok = !is_null($claims) && !empty($claims['sub']);
    }
    $error = 'invalid_request';
}

if ($ok) {
    $error = 'invalid_client';
    $tool = $DB->get_record('lti_types', array('clientid' => $claims['sub']));
    if ($tool) {
        $typeconfig = lti_get_type_config($tool->id);
        if (!empty($typeconfig['publickey'])) {
            try {
                $jwt = JWT::decode($clientassertion, $typeconfig['publickey'], array('RS256'));
                $ok = true;
            } catch (Exception $e) {
                $ok = false;
            }
        }
    } else {
        $ok = false;
    }
}

if ($ok) {
    $scopes = array();
    $requestedscopes = explode(' ', $scope);
    $permittedscopes = lti_get_permitted_service_scopes($tool, $typeconfig);
    $scopes = array_intersect($requestedscopes, $permittedscopes);
    $ok = !empty($scopes);
    $error = 'invalid_scope';
}

if ($ok) {
    $token = lti_new_access_token($tool->id, $scopes);
    $expiry = LTI_ACCESS_TOKEN_LIFE;
    $permittedscopes = implode(' ', $scopes);
    $body = <<< EOD
{
  "access_token" : "{$token->token}",
  "token_type" : "Bearer",
  "expires_in" : {$expiry},
  "scope" : "{$permittedscopes}"
}
EOD;
} else {
    $response->set_code(400);
    $body = <<< EOD
{
  "error" : "{$error}"
}
EOD;
}

$response->set_body($body);

$response->send();