Remove support for outdated Create format

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -293,33 +293,12 @@ def inbox(%{assigns: %{valid_signature: false}} = conn, _params) do
     |> json("Invalid HTTP Signature")
   end
 
-  # POST /relay/inbox -or- POST /internal/fetch/inbox
-  def inbox(conn, %{"type" => "Create"} = params) do
-    if FederatingPlug.federating?() do
-      post_inbox_relayed_create(conn, params)
-    else
-      conn
-      |> put_status(:bad_request)
-      |> json("Not federating")
-    end
-  end
-
   def inbox(conn, _params) do
     conn
     |> put_status(:bad_request)
     |> json("error, missing HTTP Signature")
   end
 
-  defp post_inbox_relayed_create(conn, params) do
-    Logger.debug(
-      "Signature missing or not from author, relayed Create message, fetching object from source"
-    )
-
-    Fetcher.fetch_object_from_id(params["object"]["id"])
-
-    json(conn, "ok")
-  end
-
   defp represent_service_actor(%User{} = user, conn) do
     conn
     |> put_resp_content_type("application/activity+json")

test/pleroma/web/activity_pub/activity_pub_controller_test.exs

@@ -662,35 +662,6 @@ test "accept follow activity", %{conn: conn} do
       assert_receive {:mix_shell, :info, ["https://relay.mastodon.host/actor"]}
     end
 
-    @tag capture_log: true
-    test "without valid signature, " <>
-           "it only accepts Create activities and requires enabled federation",
-         %{conn: conn} do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Jason.decode!()
-      non_create_data = File.read!("test/fixtures/mastodon-announce.json") |> Jason.decode!()
-
-      conn = put_req_header(conn, "content-type", "application/activity+json")
-
-      clear_config([:instance, :federating], false)
-
-      conn
-      |> post("/inbox", data)
-      |> json_response(403)
-
-      conn
-      |> post("/inbox", non_create_data)
-      |> json_response(403)
-
-      clear_config([:instance, :federating], true)
-
-      ret_conn = post(conn, "/inbox", data)
-      assert "ok" == json_response(ret_conn, 200)
-
-      conn
-      |> post("/inbox", non_create_data)
-      |> json_response(400)
-    end
-
     test "accepts Add/Remove activities", %{conn: conn} do
       object_id = "c61d6733-e256-4fe1-ab13-1e369789423f"