module Auth::Sanitizer::FilteredAttributes::ClassMethods

def filtered_attribute_names(base)
  return [] unless base.instance_variable_defined?(:@filtered_attribute_names)
  base.instance_variable_get(:@filtered_attribute_names) || []
end

def filtered_attribute_names
  ClassMethods.filtered_attribute_names(self)
end

def filtered_attributes(base, *attributes)
  base.instance_variable_set(:@filtered_attribute_names, attributes.map(&:to_sym))
end

def filtered_attributes(*attributes)
  ClassMethods.filtered_attributes(self, *attributes)
end