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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.MRF.MentionPolicy do
   6   @moduledoc "Block messages which mention a user"
   7
   8   @behaviour Pleroma.Web.ActivityPub.MRF
   9
  10   @impl true
  11   def filter(%{"type" => "Create"} = message) do
  12     reject_actors = Pleroma.Config.get([:mrf_mention, :actors], [])
  13     recipients = (message["to"] || []) ++ (message["cc"] || [])
  14
  15     if Enum.any?(recipients, fn recipient -> Enum.member?(reject_actors, recipient) end) do
  16       {:reject, nil}
  17     else
  18       {:ok, message}
  19     end
  20   end
  21
  22   @impl true
  23   def filter(message), do: {:ok, message}
  24
  25   @impl true
  26   def describe, do: {:ok, %{}}
  27 end