Merge branch 'feature/mrf-user-allowlist' into 'develop'

MRF: user allowlist module

See merge request pleroma/pleroma!477

lib/pleroma/web/activity_pub/mrf/user_allowlist.ex

@@ -0,0 +1,23 @@
+defmodule Pleroma.Web.ActivityPub.MRF.UserAllowListPolicy do
+  alias Pleroma.Config
+
+  @behaviour Pleroma.Web.ActivityPub.MRF
+
+  defp filter_by_list(object, []), do: {:ok, object}
+
+  defp filter_by_list(%{"actor" => actor} = object, allow_list) do
+    if actor in allow_list do
+      {:ok, object}
+    else
+      {:reject, nil}
+    end
+  end
+
+  @impl true
+  def filter(object) do
+    actor_info = URI.parse(object["actor"])
+    allow_list = Config.get([:mrf_user_allowlist, String.to_atom(actor_info.host)], [])
+
+    filter_by_list(object, allow_list)
+  end
+end

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 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController 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 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController do
         %{
           mrf_policies: mrf_policies,
           mrf_simple: mrf_simple,
+          mrf_user_allowlist: mrf_user_allowlist,
           quarantined_instances: quarantined
         }
       else