git.squeep.com Git - akkoma/blob - priv/scrubbers/twitter_text.ex

   1 defmodule Pleroma.HTML.Scrubber.TwitterText do
   2   @moduledoc """
   3   An HTML scrubbing policy which limits to twitter-style text.  Only
   4   paragraphs, breaks and links are allowed through the filter.
   5   """
   6
   7   @valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
   8
   9   require FastSanitize.Sanitizer.Meta
  10   alias FastSanitize.Sanitizer.Meta
  11
  12   Meta.strip_comments()
  13
  14   # links
  15   Meta.allow_tag_with_uri_attributes(:a, ["href", "data-user", "data-tag"], @valid_schemes)
  16
  17   Meta.allow_tag_with_this_attribute_values(:a, "class", [
  18     "hashtag",
  19     "u-url",
  20     "mention",
  21     "u-url mention",
  22     "mention u-url"
  23   ])
  24
  25   Meta.allow_tag_with_this_attribute_values(:a, "rel", [
  26     "tag",
  27     "nofollow",
  28     "noopener",
  29     "noreferrer"
  30   ])
  31
  32   Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
  33
  34   # paragraphs and linebreaks
  35   Meta.allow_tag_with_these_attributes(:br, [])
  36   Meta.allow_tag_with_these_attributes(:p, [])
  37
  38   # microformats
  39   Meta.allow_tag_with_this_attribute_values(:span, "class", ["h-card"])
  40   Meta.allow_tag_with_these_attributes(:span, [])
  41
  42   # allow inline images for custom emoji
  43   if Pleroma.Config.get([:markup, :allow_inline_images]) do
  44     # restrict img tags to http/https only, because of MediaProxy.
  45     Meta.allow_tag_with_uri_attributes(:img, ["src"], ["http", "https"])
  46
  47     Meta.allow_tag_with_these_attributes(:img, [
  48       "width",
  49       "height",
  50       "class",
  51       "title",
  52       "alt"
  53     ])
  54   end
  55
  56   Meta.strip_everything_not_covered()
  57 end