Basic Room creation.

lib/pleroma/web/activity_pub/chat/room.ex

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+defmodule Pleroma.Web.ActivityPub.Chat.Room do
+  alias Pleroma.Web.ActivityPub.Actor
+  def build(name) do
+    base_url = Pleroma.Web.Endpoint.url()
+    base = "#{base_url}/chat/rooms/#{name}"
+    with {:ok, actor} <- Actor.build(base) do
+      room = actor
+      |> Map.put("name", name)
+      |> Map.put("members", [])
+
+      {:ok, room}
+    end
+  end
+end

test/web/activity_pub/chat/room_test.exs

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+defmodule Pleroma.Web.ActivityPub.Chat.RoomTest do
+  use Pleroma.DataCase
+  alias Pleroma.Web.ActivityPub.Chat.Room
+
+  test "builds a local room" do
+    {:ok, room} = Room.build("chatroom")
+    assert room["id"] =~ "/chat/rooms/chatroom"
+    assert room["name"] == "chatroom"
+    assert room["members"] == []
+    assert room["inbox"]
+  end
+end