Prevents unwanted information from leaking in a public Nextcloud instance.

status.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Andreas Fischer <bantu@owncloud.com>
 * @author Christopher Schäpers <kondou@ts.unde.re>
 * @author Frank Karlitschek <frank@karlitschek.de>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Masaki Kawabata Neto <masaki.kawabata@gmail.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
try {
	require_once __DIR__ . '/lib/base.php';
	$systemConfig = \OC::$server->getSystemConfig();
	$installed = (bool) $systemConfig->getValue('installed', false);
	$maintenance = (bool) $systemConfig->getValue('maintenance', false);
	# see core/lib/private/legacy/defaults.php and core/themes/example/defaults.php
	# for description and defaults
	$defaults = new \OCP\Defaults();
	$values=array(
		'installed'=>$installed,
		'maintenance' => $maintenance,
		'needsDbUpgrade' => \OCP\Util::needUpgrade(),
		'version'=>implode('.', \OCP\Util::getVersion()),
		'versionstring'=>OC_Util::getVersionString(),
		'edition'=> '',
		'productname'=>$defaults->getName());
	if (OC::$CLI) {
		print_r($values);
	} else {
		if ($userSession->isLoggedIn()) {
			header('Access-Control-Allow-Origin: *');
			header('Content-Type: application/json');
			echo json_encode($values);
		} else {
			header("HTTP/1.0 404 Not Found");
			$tmpl = new OCP\Template( '', '404', 'guest' );
			$tmpl->assign('file', $filename);
			$tmpl->printPage();
			exit;
		}

	}
} catch (Exception $ex) {
	OC_Response::setStatus(OC_Response::STATUS_INTERNAL_SERVER_ERROR);
	\OCP\Util::writeLog('remote', $ex->getMessage(), \OCP\Util::FATAL);
}