class Paperclip::UploadedFileAdapter

def cache_current_values
  self.original_filename = @target.original_filename
  @content_type = determine_content_type
  @size = File.size(@target.path)
end

def content_type_detector
  self.class.content_type_detector
end

def determine_content_type
  content_type = @target.content_type.to_s.strip
  if content_type_detector
    content_type = content_type_detector.new(@target.path).detect
  end
  content_type
end

def initialize(target)
  @target = target
  cache_current_values
  if @target.respond_to?(:tempfile)
    @tempfile = copy_to_tempfile(@target.tempfile)
  else
    @tempfile = copy_to_tempfile(@target)
  end
end