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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicy do
   6   @moduledoc "Filter messages which belong to certain activity vocabularies"
   7
   8   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
   9
  10   @impl true
  11   def filter(%{"type" => "Undo", "object" => child_message} = message) do
  12     with {:ok, _} <- filter(child_message) do
  13       {:ok, message}
  14     else
  15       {:reject, _} = e -> e
  16     end
  17   end
  18
  19   def filter(%{"type" => message_type} = message) do
  20     with accepted_vocabulary <- Pleroma.Config.get([:mrf_vocabulary, :accept]),
  21          rejected_vocabulary <- Pleroma.Config.get([:mrf_vocabulary, :reject]),
  22          {_, true} <-
  23            {:accepted,
  24             Enum.empty?(accepted_vocabulary) || Enum.member?(accepted_vocabulary, message_type)},
  25          {_, false} <-
  26            {:rejected,
  27             length(rejected_vocabulary) > 0 && Enum.member?(rejected_vocabulary, message_type)},
  28          {:ok, _} <- filter(message["object"]) do
  29       {:ok, message}
  30     else
  31       {:reject, _} = e -> e
  32       {:accepted, _} -> {:reject, "[VocabularyPolicy] #{message_type} not in accept list"}
  33       {:rejected, _} -> {:reject, "[VocabularyPolicy] #{message_type} in reject list"}
  34       _ -> {:reject, "[VocabularyPolicy]"}
  35     end
  36   end
  37
  38   def filter(message), do: {:ok, message}
  39
  40   @impl true
  41   def describe,
  42     do: {:ok, %{mrf_vocabulary: Pleroma.Config.get(:mrf_vocabulary) |> Enum.into(%{})}}
  43
  44   @impl true
  45   def config_description do
  46     %{
  47       key: :mrf_vocabulary,
  48       related_policy: "Pleroma.Web.ActivityPub.MRF.VocabularyPolicy",
  49       label: "MRF Vocabulary",
  50       description: "Filter messages which belong to certain activity vocabularies",
  51       children: [
  52         %{
  53           key: :accept,
  54           type: {:list, :string},
  55           description:
  56             "A list of ActivityStreams terms to accept. If empty, all supported messages are accepted.",
  57           suggestions: ["Create", "Follow", "Mention", "Announce", "Like"]
  58         },
  59         %{
  60           key: :reject,
  61           type: {:list, :string},
  62           description:
  63             "A list of ActivityStreams terms to reject. If empty, no messages are rejected.",
  64           suggestions: ["Create", "Follow", "Mention", "Announce", "Like"]
  65         }
  66       ]
  67     }
  68   end
  69 end