Added IWebhookUser and MessageSource

src/Discord.Net.WebSocket/Entities/Users/SocketUnknownUser.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Diagnostics;
+using Model = Discord.API.User;
+using PresenceModel = Discord.API.Presence;
+
+namespace Discord.WebSocket
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class SocketUnknownUser : SocketUser
+    {
+        public override string Username { get; internal set; }
+        public override ushort DiscriminatorValue { get; internal set; }
+        public override string AvatarId { get; internal set; }
+        public override bool IsBot { get; internal set; }
+
+        public override bool IsWebhook => false;
+
+        internal override SocketPresence Presence { get { return new SocketPresence(UserStatus.Offline, null); } set { } }
+        internal override SocketGlobalUser GlobalUser { get { throw new NotSupportedException(); } }
+
+        internal SocketUnknownUser(DiscordSocketClient discord, ulong id)
+            : base(discord, id)
+        {
+        }
+        internal static SocketUnknownUser Create(DiscordSocketClient discord, ClientState state, Model model)
+        {
+            var entity = new SocketUnknownUser(discord, model.Id);
+            entity.Update(state, model);
+            return entity;
+        }
+
+        internal override void Update(ClientState state, PresenceModel model)
+        {
+            if (model.User.Avatar.IsSpecified)
+                AvatarId = model.User.Avatar.Value;
+            if (model.User.Discriminator.IsSpecified)
+                DiscriminatorValue = ushort.Parse(model.User.Discriminator.Value);
+            if (model.User.Bot.IsSpecified)
+                IsBot = model.User.Bot.Value;
+            if (model.User.Username.IsSpecified)
+                Username = model.User.Username.Value;
+        }
+
+        internal new SocketUnknownUser Clone() => MemberwiseClone() as SocketUnknownUser;
+    }
+}