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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 do
   6   @callback filter(Map.t()) :: {:ok | :reject, Map.t()}
   7
   8   def filter(object) do
   9     get_policies()
  10     |> Enum.reduce({:ok, object}, fn
  11       policy, {:ok, object} ->
  12         policy.filter(object)
  13
  14       _, error ->
  15         error
  16     end)
  17   end
  18
  19   def get_policies do
  20     Application.get_env(:pleroma, :instance, [])
  21     |> Keyword.get(:rewrite_policy, [])
  22     |> get_policies()
  23   end
  24
  25   defp get_policies(policy) when is_atom(policy), do: [policy]
  26   defp get_policies(policies) when is_list(policies), do: policies
  27   defp get_policies(_), do: []
  28 end