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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.NormalizeMarkup do
   6   @moduledoc "Scrub configured hypertext markup"
   7   alias Pleroma.HTML
   8
   9   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
  10
  11   @impl true
  12   def history_awareness, do: :auto
  13
  14   @impl true
  15   def filter(%{"type" => type, "object" => child_object} = object)
  16       when type in ["Create", "Update"] do
  17     scrub_policy = Pleroma.Config.get([:mrf_normalize_markup, :scrub_policy])
  18
  19     content =
  20       child_object["content"]
  21       |> HTML.filter_tags(scrub_policy)
  22
  23     object = put_in(object, ["object", "content"], content)
  24
  25     {:ok, object}
  26   end
  27
  28   def filter(object), do: {:ok, object}
  29
  30   @impl true
  31   def describe, do: {:ok, %{}}
  32
  33   @impl true
  34   def config_description do
  35     %{
  36       key: :mrf_normalize_markup,
  37       related_policy: "Pleroma.Web.ActivityPub.MRF.NormalizeMarkup",
  38       label: "MRF Normalize Markup",
  39       description: "MRF NormalizeMarkup settings. Scrub configured hypertext markup.",
  40       children: [
  41         %{
  42           key: :scrub_policy,
  43           type: :module,
  44           suggestions: [Pleroma.HTML.Scrubber.Default]
  45         }
  46       ]
  47     }
  48   end
  49 end