# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicy do @moduledoc "Filter messages which belong to certain activity vocabularies" @behaviour Pleroma.Web.ActivityPub.MRF @impl true def filter(%{"type" => "Undo", "object" => child_message} = message) do with {:ok, _} <- filter(child_message) do {:ok, message} else {:reject, _} = e -> e end end def filter(%{"type" => message_type} = message) do with accepted_vocabulary <- Pleroma.Config.get([:mrf_vocabulary, :accept]), rejected_vocabulary <- Pleroma.Config.get([:mrf_vocabulary, :reject]), {_, true} <- {:accepted, Enum.empty?(accepted_vocabulary) || Enum.member?(accepted_vocabulary, message_type)}, {_, false} <- {:rejected, length(rejected_vocabulary) > 0 && Enum.member?(rejected_vocabulary, message_type)}, {:ok, _} <- filter(message["object"]) do {:ok, message} else {:reject, _} = e -> e {:accepted, _} -> {:reject, "[VocabularyPolicy] #{message_type} not in accept list"} {:rejected, _} -> {:reject, "[VocabularyPolicy] #{message_type} in reject list"} _ -> {:reject, "[VocabularyPolicy]"} end end def filter(message), do: {:ok, message} @impl true def describe, do: {:ok, %{mrf_vocabulary: Pleroma.Config.get(:mrf_vocabulary) |> Enum.into(%{})}} @impl true def config_description do %{ key: :mrf_vocabulary, related_policy: "Pleroma.Web.ActivityPub.MRF.VocabularyPolicy", label: "MRF Vocabulary", description: "Filter messages which belong to certain activity vocabularies", children: [ %{ key: :accept, type: {:list, :string}, description: "A list of ActivityStreams terms to accept. If empty, all supported messages are accepted.", suggestions: ["Create", "Follow", "Mention", "Announce", "Like"] }, %{ key: :reject, type: {:list, :string}, description: "A list of ActivityStreams terms to reject. If empty, no messages are rejected.", suggestions: ["Create", "Follow", "Mention", "Announce", "Like"] } ] } end end