class Rack::Multipart::UploadedFile

def initialize(filepath = nil, ct = "text/plain", bin = false,
               path: filepath, content_type: ct, binary: bin, filename: nil, io: nil)
  if io
    @tempfile = io
    @original_filename = filename
  else
    raise "#{path} file does not exist" unless ::File.exist?(path)
    @original_filename = filename || ::File.basename(path)
    @tempfile = Tempfile.new([@original_filename, ::File.extname(path)], encoding: Encoding::BINARY)
    @tempfile.binmode if binary
    FileUtils.copy_file(path, @tempfile.path)
  end
  @content_type = content_type
end