Change structure

lib/nulla_web/controllers/activitypub/webfinger_controller.ex

@@ -0,0 +1,39 @@
+defmodule NullaWeb.ActivityPub.WebfingerController do
+  use NullaWeb, :controller
+  alias Nulla.ActivityPub
+  alias Nulla.Models.Actor
+
+  def index(conn, %{"resource" => resource}) do
+    case Regex.run(~r/^acct:(.+)@(.+)$/, resource) do
+      [_, preferredUsername, actor_domain] ->
+        case Actor.get_actor(preferredUsername: preferredUsername, domain: actor_domain) do
+          nil ->
+            conn
+            |> put_resp_content_type("text/plain")
+            |> send_resp(404, "")
+
+          %Actor{} = actor ->
+            domain = NullaWeb.Endpoint.host()
+
+            if actor_domain == domain do
+              json(conn, ActivityPub.webfinger(actor))
+            else
+              conn
+              |> put_resp_content_type("text/plain")
+              |> send_resp(404, "")
+            end
+        end
+
+      _ ->
+        conn
+        |> put_resp_content_type("text/plain")
+        |> send_resp(400, "")
+    end
+  end
+
+  def index(conn, _params) do
+    conn
+    |> put_resp_content_type("text/plain")
+    |> send_resp(400, "")
+  end
+end