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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.UserAllowListPolicy do
   6   alias Pleroma.Config
   7
   8   @moduledoc "Accept-list of users from specified instances"
   9   @behaviour Pleroma.Web.ActivityPub.MRF
  10
  11   defp filter_by_list(object, []), do: {:ok, object}
  12
  13   defp filter_by_list(%{"actor" => actor} = object, allow_list) do
  14     if actor in allow_list do
  15       {:ok, object}
  16     else
  17       {:reject, "[UserAllowListPolicy] #{actor} not in the list"}
  18     end
  19   end
  20
  21   @impl true
  22   def filter(%{"actor" => actor} = object) do
  23     actor_info = URI.parse(actor)
  24
  25     allow_list =
  26       Config.get(
  27         [:mrf_user_allowlist, actor_info.host],
  28         []
  29       )
  30
  31     filter_by_list(object, allow_list)
  32   end
  33
  34   def filter(object), do: {:ok, object}
  35
  36   @impl true
  37   def describe do
  38     mrf_user_allowlist =
  39       Config.get([:mrf_user_allowlist], [])
  40       |> Enum.into(%{}, fn {k, v} -> {k, length(v)} end)
  41
  42     {:ok, %{mrf_user_allowlist: mrf_user_allowlist}}
  43   end
  44 end