sharp-chat/SharpChat/ConnectionInfo.cs

using Fleck;
using SharpChat.PacketsS2C;
using System;
using System.Net;

namespace SharpChat {
    public class ConnectionInfo {
        public IWebSocketConnection Socket { get; }
        public DateTimeOffset LastPing { get; private set; }

        public long UserId { get; private set; } = 0;

        public string RemoteAddress { get; }
        public ushort RemotePort { get; }
        public string RemoteEndPoint { get; }

        public ConnectionInfo(IWebSocketConnection sock) {
            Socket = sock;

            BumpPing();

            IPAddress remoteAddr = IPAddress.Parse(sock.ConnectionInfo.ClientIpAddress);

            if(IPAddress.IsLoopback(remoteAddr)
                && sock.ConnectionInfo.Headers.ContainsKey("X-Real-IP")
                && IPAddress.TryParse(sock.ConnectionInfo.Headers["X-Real-IP"], out IPAddress? realAddr))
                remoteAddr = realAddr;

            RemoteAddress = remoteAddr.ToString();
            RemotePort = (ushort)sock.ConnectionInfo.ClientPort;
            RemoteEndPoint = string.Format(
                RemoteAddress.Contains(':') ? "[{0}]:{1}" : "{0}:{1}",
                RemoteAddress, RemotePort
            );
        }

        // please call this through ConnectionsContext
        public void SetUserId(long userId) {
            if(UserId > 0)
                throw new InvalidOperationException("This connection is already associated with a user.");

            UserId = userId;
        }

        public void Send(SockChatS2CPacket packet) {
            string data = packet.Pack();
            if(!string.IsNullOrWhiteSpace(data))
                Send(data);
        }

        public void Send(string packet) {
            if(Socket.IsAvailable)
                Socket.Send(packet).Wait();
        }

        public void BumpPing() {
            LastPing = DateTimeOffset.UtcNow;
        }

        public void Close(int code) {
            Socket.Close(code);
        }
    }
}