class Rails::HTML::PermitScrubber

def scrub_attribute(node, attr_node)
  attr_name = if attr_node.namespace
    "#{attr_node.namespace.prefix}:#{attr_node.node_name}"
  else
    attr_node.node_name
  end
  return if Loofah::HTML5::SafeList::ATTR_VAL_IS_URI.include?(attr_name) && Loofah::HTML5::Scrub.scrub_uri_attribute(attr_node)
  if Loofah::HTML5::SafeList::SVG_ATTR_VAL_ALLOWS_REF.include?(attr_name)
    Loofah::HTML5::Scrub.scrub_attribute_that_allows_local_ref(attr_node)
  end
  if Loofah::HTML5::SafeList::SVG_ALLOW_LOCAL_HREF.include?(node.name) && attr_name == "xlink:href" && attr_node.value =~ /^\s*[^#\s].*/m
    attr_node.remove
  end
  node.remove_attribute(attr_node.name) if attr_name == "src" && attr_node.value !~ /[^[:space:]]/
  Loofah::HTML5::Scrub.force_correct_attribute_escaping! node
end