<?php
/*
** Zabbix
** Copyright (C) 2001-2016 Zabbix SIA
**
** This program 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 2 of the License, or
** (at your option) any later version.
**
** 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/


class CWebUser {

	public static $data = null;

	public static function login($login, $password) {
		try {
			self::setDefault();

			self::$data = API::User()->login(array(
				'user' => $login,
				'password' => $password,
				'userData' => true
			));

			if (!self::$data) {
				throw new Exception();
			}

			if (self::$data['gui_access'] == GROUP_GUI_ACCESS_DISABLED) {
				error(_('GUI access disabled.'));
				throw new Exception();
			}

			if (empty(self::$data['url'])) {
				self::$data['url'] = CProfile::get('web.menu.view.last', 'index.php');
			}

			if (isset(self::$data['attempt_failed']) && self::$data['attempt_failed']) {
				CProfile::init();
				CProfile::update('web.login.attempt.failed', self::$data['attempt_failed'], PROFILE_TYPE_INT);
				CProfile::update('web.login.attempt.ip', self::$data['attempt_ip'], PROFILE_TYPE_STR);
				CProfile::update('web.login.attempt.clock', self::$data['attempt_clock'], PROFILE_TYPE_INT);
				CProfile::flush();
			}

			// remove guest session after successful login
			DBexecute('DELETE FROM sessions WHERE sessionid='.zbx_dbstr(get_cookie('zbx_sessionid')));

			zbx_setcookie('zbx_sessionid', self::$data['sessionid'], self::$data['autologin'] ? time() + SEC_PER_DAY * 31 : 0);

			return true;
		}
		catch (Exception $e) {
			self::setDefault();
			return false;
		}
	}

	public static function logout() {
		self::$data['sessionid'] = get_cookie('zbx_sessionid');
		self::$data = API::User()->logout();
		zbx_unsetcookie('zbx_sessionid');
	}

	public static function checkAuthentication($sessionid) {
		try {
			if ($sessionid !== null) {
				self::$data = API::User()->checkAuthentication($sessionid);
			}

			if ($sessionid === null || empty(self::$data)) {
				self::setDefault();
				self::$data = API::User()->login(array(
					'user' => ZBX_GUEST_USER,
					'password' => '',
					'userData' => true
				));

				if (empty(self::$data)) {
					clear_messages(1);
					throw new Exception();
				}
				$sessionid = self::$data['sessionid'];
			}

			if (self::$data['gui_access'] == GROUP_GUI_ACCESS_DISABLED) {
				error(_('GUI access disabled.'));
				throw new Exception();
			}

			zbx_setcookie('zbx_sessionid', $sessionid, self::$data['autologin'] ? time() + SEC_PER_DAY * 31 : 0);

			return true;
		}
		catch (Exception $e) {
			self::setDefault();
			return false;
		}
	}

	public static function setDefault() {
		self::$data = array(
			'alias' => ZBX_GUEST_USER,
			'userid' => 0,
			'lang' => 'en_gb',
			'type' => '0',
			'node' => array('name' => '- unknown -', 'nodeid' => 0)
		);
	}

	/**
	 * Returns the type of the current user.
	 *
	 * @static
	 *
	 * @return int
	 */
	public static function getType() {
		return self::$data['type'];
	}

	/**
	 * Returns true if the current user is logged in.
	 *
	 * @return bool
	 */
	public static function isLoggedIn() {
		return (self::$data['userid']);
	}

	/**
	 * Returns true if the user is not logged in or logged in as Guest.
	 *
	 * @return bool
	 */
	public static function isGuest() {
		return (self::$data['alias'] == ZBX_GUEST_USER);
	}
}
