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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.SubchainPolicy do
   6   alias Pleroma.Config
   7   alias Pleroma.Web.ActivityPub.MRF
   8
   9   require Logger
  10
  11   @behaviour Pleroma.Web.ActivityPub.MRF
  12
  13   defp lookup_subchain(actor) do
  14     with matches <- Config.get([:mrf_subchain, :match_actor]),
  15          {match, subchain} <- Enum.find(matches, fn {k, _v} -> String.match?(actor, k) end) do
  16       {:ok, match, subchain}
  17     else
  18       _e -> {:error, :notfound}
  19     end
  20   end
  21
  22   @impl true
  23   def filter(%{"actor" => actor} = message) do
  24     with {:ok, match, subchain} <- lookup_subchain(actor) do
  25       Logger.debug(
  26         "[SubchainPolicy] Matched #{actor} against #{inspect(match)} with subchain #{
  27           inspect(subchain)
  28         }"
  29       )
  30
  31       subchain
  32       |> MRF.filter(message)
  33     else
  34       _e -> {:ok, message}
  35     end
  36   end
  37
  38   @impl true
  39   def filter(message), do: {:ok, message}
  40
  41   @impl true
  42   def describe, do: {:ok, %{}}
  43 end