Simple ftp-server with Ruby

ftpd.rb

require 'ftpd'

class Driver
  def initialize(temp_dir)
    @temp_dir = temp_dir
  end
  def authenticate(user, password)
     true
  end
  def file_system(user)
    Ftpd::DiskFileSystem.new(@temp_dir)
  end
end

driver = Driver.new("/home/dsalahutdinov")
server = Ftpd::FtpServer.new(driver)
server.log = Logger.new($stdout)
server.start
puts "Server listening on port #{server.bound_port}"
gets