Name adjustments and moved some things to the common lib.

SharpChat/Connection.cs

@@ -0,0 +1,89 @@
+using Fleck;
+using System.Net;
+
+namespace SharpChat {
+    public class Connection : IDisposable {
+        public const int ID_LENGTH = 20;
+
+#if DEBUG
+        public static TimeSpan SessionTimeOut { get; } = TimeSpan.FromMinutes(1);
+#else
+        public static TimeSpan SessionTimeOut { get; } = TimeSpan.FromMinutes(5);
+#endif
+
+        public IWebSocketConnection Socket { get; }
+
+        public string Id { get; }
+        public bool IsDisposed { get; private set; }
+        public DateTimeOffset LastPing { get; set; } = DateTimeOffset.Now;
+        public User? User { get; set; }
+
+        private int CloseCode { get; set; } = 1000;
+
+        public IPAddress RemoteAddress { get; }
+        public ushort RemotePort { get; }
+
+        public bool IsAlive => !IsDisposed && !HasTimedOut;
+
+        public Connection(IWebSocketConnection sock) {
+            Socket = sock;
+            Id = RNG.SecureRandomString(ID_LENGTH);
+
+            if(!IPAddress.TryParse(sock.ConnectionInfo.ClientIpAddress, out IPAddress? addr))
+                throw new Exception("Unable to parse remote address?????");
+
+            if(IPAddress.IsLoopback(addr)
+                && sock.ConnectionInfo.Headers.TryGetValue("X-Real-IP", out string? addrStr)
+                && IPAddress.TryParse(addrStr, out IPAddress? realAddr))
+                addr = realAddr;
+
+            RemoteAddress = addr;
+            RemotePort = (ushort)sock.ConnectionInfo.ClientPort;
+        }
+
+        public void Send(S2CPacket packet) {
+            if(!Socket.IsAvailable)
+                return;
+
+            string data = packet.Pack();
+            if(!string.IsNullOrWhiteSpace(data))
+                Socket.Send(data);
+        }
+
+        public void BumpPing() {
+            LastPing = DateTimeOffset.Now;
+        }
+
+        public bool HasTimedOut
+            => DateTimeOffset.Now - LastPing > SessionTimeOut;
+
+        public void PrepareForRestart() {
+            CloseCode = 1012;
+        }
+
+        ~Connection() {
+            DoDispose();
+        }
+
+        public void Dispose() {
+            DoDispose();
+            GC.SuppressFinalize(this);
+        }
+
+        private void DoDispose() {
+            if(IsDisposed)
+                return;
+
+            IsDisposed = true;
+            Socket.Close(CloseCode);
+        }
+
+        public override string ToString() {
+            return Id;
+        }
+
+        public override int GetHashCode() {
+            return Id.GetHashCode();
+        }
+    }
+}