module Ckeditor::Backend::Dragonfly::ClassMethods

def attachment_file_types
  @attachment_file_types ||= Ckeditor.attachment_file_types.map(&:to_s).tap do |formats|
    # This is not ideal but Dragonfly doesn't return double
    # extensions. Having said that, the other backends
    # currently don't use attachment_file_types at all.
    FORMATS.each do |f|
      formats << f if formats.include?("tar.#{f}")
    end
  end
end

def image_file_types
  @image_file_types ||= Ckeditor.image_file_types.map(&:to_s)
end