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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.Activity.HTML do
   6   alias Pleroma.HTML
   7   alias Pleroma.Object
   8
   9   @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
  10
  11   def get_cached_scrubbed_html_for_activity(
  12         content,
  13         scrubbers,
  14         activity,
  15         key \\ "",
  16         callback \\ fn x -> x end
  17       ) do
  18     key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
  19
  20     @cachex.fetch!(:scrubber_cache, key, fn _key ->
  21       object = Object.normalize(activity, fetch: false)
  22       HTML.ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
  23     end)
  24   end
  25
  26   def get_cached_stripped_html_for_activity(content, activity, key) do
  27     get_cached_scrubbed_html_for_activity(
  28       content,
  29       FastSanitize.Sanitizer.StripTags,
  30       activity,
  31       key,
  32       &HtmlEntities.decode/1
  33     )
  34   end
  35
  36   defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
  37     generate_scrubber_signature([scrubber])
  38   end
  39
  40   defp generate_scrubber_signature(scrubbers) do
  41     Enum.reduce(scrubbers, "", fn scrubber, signature ->
  42       "#{signature}#{to_string(scrubber)}"
  43     end)
  44   end
  45 end