Implement handling confirm_teleportation

apps/amethyst/lib/apps/connection_handler.ex

@@ -64,6 +64,9 @@ defmodule Amethyst.ConnectionHandler do
         Logger.debug("Sending packet #{inspect(packet)}")
         send_packet(socket, connstate, packet, version)
         loop(socket, connstate, version, state)
+      {:tp_done, id} ->
+        # TODO: Implement a proper teleportation API
+        Logger.debug("Accepted teleportation #{inspect(id)}")
       after 0 ->
         receive do
           {:packet, id, data} ->

apps/amethyst/lib/states/play.ex

@@ -49,6 +49,28 @@ defmodule Amethyst.ConnectionState.Play do
     portal_cooldown: :varint,
     enforces_secure_chat: :bool,
   ]
+  Macros.defpacket_clientbound :synchronize_player_position, 0x40, 747, [
+    x: :double,
+    y: :double,
+    z: :double,
+    yaw: :float,
+    pitch: :double,
+    flags: :byte,
+    teleport_id: :varint
+  ]
+
+  Macros.defpacket_serverbound :confirm_teleportation, 0x00, 747, [teleport_id: :varint]
+
+  def handle(%{packet_type: :confirm_teleportation, teleport_id: id}, 747, state) do
+    if state[:teleport_id] == id do
+      # The client has accepted our teleportation, we can let the connection process know
+      send(self(), {:tp_done, id})
+      state |> Map.put(:teleport_id, nil)
+    else
+      # The client has not yet accepted our teleportation, we aren't done yet
+      state
+    end
+  end
 
   def disconnect(reason) do
     %{