Pleroma/lib/pleroma/web/web_finger/web_finger_controller.ex

defmodule Pleroma.Web.WebFinger.WebFingerController do
  use Pleroma.Web, :controller

  alias Pleroma.Web.WebFinger

  def host_meta(conn, _params) do
    xml = WebFinger.host_meta

    conn
    |> put_resp_content_type("application/xrd+xml")
    |> send_resp(200, xml)
  end

  def webfinger(conn, %{"resource" => resource}) do
    {:ok, response} = WebFinger.webfinger(resource)

    conn
    |> put_resp_content_type("application/xrd+xml")
    |> send_resp(200, response)
  end
end