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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* An oauth2 redirection endpoint which can be used for an application:
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* http://tools.ietf.org/html/draft-ietf-oauth-v2-26#section-3.1.2
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*
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* This is used because some oauth servers will not allow a redirect urls
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* with get params (like repository callback) and that needs to be called
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* using the state param.
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*
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* @package core
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* @copyright 2012 Dan Poltawski
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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require_once(__DIR__ . '/../config.php');
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// The state parameter we've given (used in moodle as a redirect url).
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// Per https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1, state is required, even during error responses.
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$state = required_param('state', PARAM_LOCALURL);
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$redirecturl = new moodle_url($state);
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$params = $redirecturl->params();
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$error = optional_param('error', '', PARAM_RAW);
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if ($error) {
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$message = optional_param('error_description', null, PARAM_RAW);
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// Errors can occur for authenticated users, such as when a user denies authorization for some internal service call.
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// In such cases, propagate the error to the component redirect URI.
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if (isloggedin()) {
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if (isset($params['sesskey']) && confirm_sesskey($params['sesskey'])) {
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$redirecturl->param('error', $error);
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if ($message) {
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$redirecturl->param('error_description', $message);
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}
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redirect($redirecturl);
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}
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}
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// Not logged in or the sesskey verification failed, redirect to login + show errors.
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$SESSION->loginerrormsg = $message ?? $error;
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redirect(new moodle_url(get_login_url()));
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}
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// The authorization code generated by the authorization server.
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$code = required_param('code', PARAM_RAW);
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if (isset($params['sesskey']) and confirm_sesskey($params['sesskey'])) {
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$redirecturl->param('oauth2code', $code);
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redirect($redirecturl);
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} else {
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$SESSION->loginerrormsg = get_string('invalidsesskey', 'error');
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redirect(new moodle_url(get_login_url()));
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}
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