Change structure

lib/nulla_web/controllers/web/note_controller.ex

@@ -0,0 +1,44 @@
+defmodule NullaWeb.Web.NoteController do
+  use NullaWeb, :controller
+  alias Nulla.Repo
+  alias Nulla.ActivityPub
+  alias Nulla.Models.Note
+
+  def show(conn, %{"username" => username, "id" => id}) do
+    case Integer.parse(id) do
+      {int_id, ""} ->
+        note = Note.get_note(id: int_id) |> Repo.preload([:actor, :media_attachments])
+
+        cond do
+          is_nil(note) ->
+            conn
+            |> put_status(:not_found)
+            |> json(%{error: "Not Found"})
+            |> halt()
+
+          username != note.actor.preferredUsername ->
+            conn
+            |> put_status(:not_found)
+            |> json(%{error: "Not Found"})
+            |> halt()
+
+          true ->
+            format = Phoenix.Controller.get_format(conn)
+
+            if format == "activity+json" do
+              conn
+              |> put_resp_content_type("application/activity+json")
+              |> json(ActivityPub.note(note))
+            else
+              render(conn, :show, note: note, layout: false)
+            end
+        end
+
+      _ ->
+        conn
+        |> put_status(:not_found)
+        |> json(%{error: "Not Found"})
+        |> halt()
+    end
+  end
+end