    # File lib/fog/ninefold/models/storage/file.rb, line 59
            def public_url(expires = (Time.now + 5 * 365 * 24 * 60 * 60))
              requires :objectid
              # TODO - more efficient method to get this?
              storage = Fog::Storage.new(:provider => 'Ninefold')
              uri = URI::HTTP.build(:scheme => Fog::Storage::Ninefold::STORAGE_SCHEME, :host => Fog::Storage::Ninefold::STORAGE_HOST, :port => Fog::Storage::Ninefold::STORAGE_PORT.to_i, :path => "/rest/objects/#{objectid}" )
              Fog::Storage.new(:provider => 'Ninefold').uid

              sb = "GET\n"
              sb += uri.path.downcase + "\n"
              sb += storage.uid + "\n"
              sb += String(expires.to_i())

              signature = storage.sign( sb )
              uri.query = "uid=#{CGI::escape(storage.uid)}&expires=#{expires.to_i()}&signature=#{CGI::escape(signature)}"
              uri.to_s
            end