world object auth

QSB/AuthoritySync/IAuthWorldObject.cs

@@ -0,0 +1,15 @@
+using QSB.WorldSync;
+
+namespace QSB.AuthoritySync;
+
+/// <summary>
+/// a world object that has an owner
+/// </summary>
+public interface IAuthWorldObject : IWorldObject
+{
+	public uint Owner { get; set; }
+	/// <summary>
+	/// can the world object have authority
+	/// </summary>
+	public bool CanOwn { get; }
+}

QSB/AuthoritySync/WorldObjectAuthMessage.cs

@@ -0,0 +1,45 @@
+using QSB.Messaging;
+using QSB.Player;
+
+namespace QSB.AuthoritySync;
+
+/// <summary>
+/// request ownership of a world object
+/// </summary>
+public class WorldObjectAuthMessage : QSBWorldObjectMessage<IAuthWorldObject, uint>
+{
+	public WorldObjectAuthMessage(uint owner) : base(owner) { }
+
+	public override bool ShouldReceive
+	{
+		get
+		{
+			if (!base.ShouldReceive)
+			{
+				return false;
+			}
+
+			// Deciding if to change the object's owner
+			//		  Message
+			//	   | = 0 | > 0 |
+			// = 0 | No  | Yes |
+			// > 0 | Yes | No  |
+			// if Obj==Message then No
+			// Obj
+
+			return (WorldObject.Owner == 0 || Data == 0) && WorldObject.Owner != Data;
+		}
+	}
+
+	public override void OnReceiveLocal() => WorldObject.Owner = Data;
+
+	public override void OnReceiveRemote()
+	{
+		WorldObject.Owner = Data;
+		if (WorldObject.Owner == 0 && WorldObject.CanOwn)
+		{
+			// object has no owner, but is still active for this player. request ownership
+			WorldObject.SendMessage(new WorldObjectAuthMessage(QSBPlayerManager.LocalPlayerId));
+		}
+	}
+}