Add User.get_domain/1

lib/pleroma/user.ex

@@ -2293,4 +2293,8 @@ defmodule Pleroma.User do
     |> Map.put(:bio, HTML.filter_tags(user.bio, filter))
     |> Map.put(:fields, fields)
   end
+
+  def get_domain(%User{ap_id: ap_id} = user) do
+    URI.parse(ap_id).host
+  end
 end

test/user_test.exs

@@ -1885,4 +1885,9 @@ defmodule Pleroma.UserTest do
 
     assert User.avatar_url(user, no_default: true) == nil
   end
+
+  test "get_domain/1" do
+    user = insert(:user, ap_id: "https://lain.com/users/lain", nickname: "lain")
+    assert User.get_domain(user) == "lain.com"
+  end
 end