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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 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.Policy
   9
  10   @impl true
  11   def filter(%{"type" => type} = message) when type in ["Create", "Update"] do
  12     reject_actors = Pleroma.Config.get([:mrf_mention, :actors], [])
  13     recipients = (message["to"] || []) ++ (message["cc"] || [])
  14
  15     if rejected_mention =
  16          Enum.find(recipients, fn recipient -> Enum.member?(reject_actors, recipient) end) do
  17       {:reject, "[MentionPolicy] Rejected for mention of #{rejected_mention}"}
  18     else
  19       {:ok, message}
  20     end
  21   end
  22
  23   @impl true
  24   def filter(message), do: {:ok, message}
  25
  26   @impl true
  27   def describe, do: {:ok, %{}}
  28
  29   @impl true
  30   def config_description do
  31     %{
  32       key: :mrf_mention,
  33       related_policy: "Pleroma.Web.ActivityPub.MRF.MentionPolicy",
  34       label: "MRF Mention",
  35       description: "Block messages which mention a specific user",
  36       children: [
  37         %{
  38           key: :actors,
  39           type: {:list, :string},
  40           description: "A list of actors for which any post mentioning them will be dropped",
  41           suggestions: ["actor1", "actor2"]
  42         }
  43       ]
  44     }
  45   end
  46 end