nodeinfo: add mrf_user_allowlist data

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

@@ -4,6 +4,7 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController do
   alias Pleroma.Stats
   alias Pleroma.Web
   alias Pleroma.{User, Repo}
+  alias Pleroma.Config
   alias Pleroma.Web.ActivityPub.MRF
 
   plug(Pleroma.Web.FederatingPlug)
@@ -52,6 +53,10 @@ def nodeinfo(conn, %{"version" => "2.0"}) do
       |> Repo.all()
       |> Enum.map(fn u -> u.ap_id end)
 
+    mrf_user_allowlist =
+      Config.get([:mrf_user_allowlist], [])
+      |> Enum.into(%{}, fn {k, v} -> {k, length(v)} end)
+
     mrf_transparency = Keyword.get(instance, :mrf_transparency)
 
     federation_response =
@@ -59,6 +64,7 @@ def nodeinfo(conn, %{"version" => "2.0"}) do
         %{
           mrf_policies: mrf_policies,
           mrf_simple: mrf_simple,
+          mrf_user_allowlist: mrf_user_allowlist,
           quarantined_instances: quarantined
         }
       else