akkoma/lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# 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.Policy
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@impl true
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def filter(%{"type" => "Undo", "object" => child_message} = message) do
with {:ok, _} <- filter(child_message) do
{:ok, message}
else
{:reject, _} = e -> e
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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)},
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{: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]"}
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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
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end