File: libxml2_workarounds.rb

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# coding: utf-8
# frozen_string_literal: true

require "set"

module Loofah
  #
  #  constants related to working around unhelpful libxml2 behavior
  #
  #  ಠ_ಠ
  #
  module LibxmlWorkarounds
    #
    #  these attributes and qualifying parent tags are determined by the code at:
    #
    #    https://git.gnome.org/browse/libxml2/tree/HTMLtree.c?h=v2.9.2#n714
    #
    #  see comments about CVE-2018-8048 within the tests for more information
    #
    BROKEN_ESCAPING_ATTRIBUTES = Set.new([
      "href",
      "action",
      "src",
      "name",
    ])
    BROKEN_ESCAPING_ATTRIBUTES_QUALIFYING_TAG = { "name" => "a" }
  end
end