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

# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Web.ActivityPub.MRF.NormalizeMarkup do
  @moduledoc "Scrub configured hypertext markup"
  alias Pleroma.HTML

  @behaviour Pleroma.Web.ActivityPub.MRF

  def filter(%{"type" => "Create", "object" => child_object} = object) do
    scrub_policy = Pleroma.Config.get([:mrf_normalize_markup, :scrub_policy])

    content =
      child_object["content"]
      |> HTML.filter_tags(scrub_policy)

    object = put_in(object, ["object", "content"], content)

    {:ok, object}
  end

  def filter(object), do: {:ok, object}

  def describe, do: {:ok, %{}}
end