<?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 page is used to fetch files while in maintenance mode.
 *
 * It should avoid as much as possible using code Moodle API.
 *
 * @package    auth_outage
 * @author     Daniel Thee Roperto <daniel.roperto@catalyst-au.net>
 * @copyright  2016 Catalyst IT
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 *
 * @var stdClass $CFG
 */

// File should have at least 3 characters as we will check the extension below.
if (!isset($_GET['file']) || (strlen($_GET['file']) < 3)) {
    http_response_code(400);
    die('Missing file parameter.');
}

// Detect type, we only support css or PNG images.
header('Content-Type: '.(substr($_GET['file'], -3) == 'css' ? 'text/css' : 'image/png'));

// Use cache.
$lifetime = 60 * 60 * 24; // 1 day.
header('Expires: '.gmdate('D, d M Y H:i:s', time() + $lifetime).' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime);
header('Accept-Ranges: none');

define('AUTH_OUTAGE_FILE', $_GET['file']);
require_once(__DIR__.'/../../config.php');

// We should never reach here if config.php and auth/outage/bootstrap.php intercepted it correctly.
debugging('Your config.php is not properly configured for auth/outage plugin. '.
          'Please check the plugin settings for information.');
exit(1);