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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.MRF.HellthreadPolicy do
   6   alias Pleroma.User
   7   @behaviour Pleroma.Web.ActivityPub.MRF
   8
   9   defp delist_message(message) do
  10     follower_collection = User.get_by_ap_id(message["actor"].follower_address)
  11
  12     message
  13     |> Map.put(["to"], [follower_collection])
  14     |> Map.put(["cc"], ["https://www.w3.org/ns/activitystreams#Public"])
  15   end
  16
  17   @impl true
  18   def filter(%{"type" => "Create"} = object) do
  19     delist_threshold = Pleroma.Config.get([:mrf_hellthread, :delist_threshold])
  20
  21     reject_threshold =
  22       Pleroma.Config.get(
  23         [:mrf_hellthread, :reject_threshold],
  24         Pleroma.Config.get([:mrf_hellthread, :threshold])
  25       )
  26
  27     recipients = (object["to"] || []) ++ (object["cc"] || [])
  28
  29     cond do
  30       length(recipients) > reject_threshold and reject_threshold > 0 ->
  31         {:reject, nil}
  32
  33       length(recipients) > delist_threshold and delist_threshold > 0 ->
  34         if Enum.member?(object["to"], "https://www.w3.org/ns/activitystreams#Public") or
  35              Enum.member?(object["cc"], "https://www.w3.org/ns/activitystreams#Public") do
  36           {:ok, delist_message(object)}
  37         else
  38           {:ok, object}
  39         end
  40
  41       true ->
  42         {:ok, object}
  43     end
  44   end
  45
  46   @impl true
  47   def filter(object), do: {:ok, object}
  48 end