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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   @impl true
  10   def filter(%{"type" => "Create"} = object) do
  11     delist_threshold = Pleroma.Config.get([:mrf_hellthread, :delist_threshold])
  12     reject_threshold = Pleroma.Config.get([:mrf_hellthread, :reject_threshold])
  13     recipients = (object["to"] || []) ++ (object["cc"] || [])
  14
  15     cond do
  16       length(recipients) > reject_threshold and reject_threshold != 0 ->
  17         {:reject, nil}
  18
  19       length(recipients) > delist_threshold and delist_threshold != 0 ->
  20         if Enum.member?(object["to"], "https://www.w3.org/ns/activitystreams#Public") or
  21              Enum.member?(object["cc"], "https://www.w3.org/ns/activitystreams#Public") do
  22           object
  23           |> Kernel.update_in(["object", "to"], [
  24             User.get_cached_by_ap_id(object["actor"].follower_address)
  25           ])
  26           |> Kernel.update_in(["object", "cc"], ["https://www.w3.org/ns/activitystreams#Public"])
  27           |> Kernel.update_in(["to"], [
  28             User.get_cached_by_ap_id(object["actor"].follower_address)
  29           ])
  30           |> Kernel.update_in(["cc"], ["https://www.w3.org/ns/activitystreams#Public"])
  31         else
  32           {:ok, object}
  33         end
  34
  35       true ->
  36         {:ok, object}
  37     end
  38   end
  39
  40   @impl true
  41   def filter(object), do: {:ok, object}
  42 end