/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System;
using System.Collections.Generic;
using System.Linq;

using ASC.Common;

using Microsoft.Extensions.Configuration;

namespace ASC.MessagingSystem
{
    [Singletone]
    public class MessagePolicy
    {
        private readonly IEnumerable<string> secretIps;

        public MessagePolicy(IConfiguration configuration)
        {
            secretIps =
                configuration["messaging.secret-ips"] == null
                ? new string[] { }
                : configuration["messaging.secret-ips"].Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
        }

        public bool Check(EventMessage message)
        {
            if (message == null) return false;
            if (string.IsNullOrEmpty(message.IP)) return true;

            var ip = GetIpWithoutPort(message.IP);
            return secretIps.All(x => x != ip);
        }

        private static string GetIpWithoutPort(string ip)
        {
            if (ip == null) return null;

            var portIdx = ip.IndexOf(':');
            return portIdx > -1 ? ip.Substring(0, portIdx) : ip;
        }
    }
}