tmp_ftp.rb

unless Rails.env.production?
  require 'ftpd'
  require 'tmpdir'

  puts "****** loading tmp_ftp *********"

  class TmpFtp
    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

    Dir.mktmpdir do |temp_dir|
      driver = TmpFtp.new(temp_dir)
      server = Ftpd::FtpServer.new(driver)
      server.start
      puts "Server listening on port #{server.bound_port}"
      sleep 5.minutes
      puts "exiting"
    end
end