# File lib/fog/brightbox/storage.rb, line 144
        def create_temp_url(container, object, expires_at, method, options = {})
          raise ArgumentError, "Storage must be instantiated with the :brightbox_temp_url_key option" if @config.storage_temp_key.nil?

          # POST not allowed
          allowed_methods = %w(GET PUT HEAD)
          unless allowed_methods.include?(method)
            raise ArgumentError.new("Invalid method '#{method}' specified. Valid methods are: #{allowed_methods.join(", ")}")
          end

          if management_url.nil?
            message = "Storage must be instantiated with the :brightbox_storage_management_url or you must authenticate first"
            raise Fog::Brightbox::Storage::ManagementUrlUnknown, message
          end

          destination_url = management_url.dup
          object_path = destination_url.path

          destination_url.scheme = options[:scheme] if options[:scheme]
          destination_url.port = options[:port] if options[:port]

          object_path_escaped = "#{object_path}/#{Fog::Storage::Brightbox.escape(container)}/#{Fog::Storage::Brightbox.escape(object, "/")}"
          object_path_unescaped = "#{object_path}/#{Fog::Storage::Brightbox.escape(container)}/#{object}"

          expiry_timestamp = expires_at.to_i
          string_to_sign = [method, expiry_timestamp, object_path_unescaped].join("\n")

          hmac = Fog::HMAC.new("sha1", @config.storage_temp_key)
          sig = sig_to_hex(hmac.sign(string_to_sign))

          destination_url.path = object_path_escaped
          destination_url.query = URI.encode_www_form(:temp_url_sig => sig, :temp_url_expires => expiry_timestamp)
          destination_url.to_s
        end