# File lib/fog/storage/openstack/requests/get_object_https_url.rb, line 37
        def create_temp_url(container, object, expires, method, options = {})
          raise ArgumentError, "Insufficient parameters specified." unless container && object && expires && method
          raise ArgumentError, "Storage must be instantiated with the :openstack_temp_url_key option" if @openstack_temp_url_key.nil?

          scheme = options[:scheme] || @scheme
          host = options[:host] || @host
          port = options[:port] || @port

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

          expires = expires.to_i
          object_path_escaped   = "#{@path}/#{Fog::OpenStack.escape(container)}/#{Fog::OpenStack.escape(object, "/")}"
          object_path_unescaped = "#{@path}/#{Fog::OpenStack.escape(container)}/#{object}"
          string_to_sign = "#{method}\n#{expires}\n#{object_path_unescaped}"

          hmac = Fog::HMAC.new('sha1', @openstack_temp_url_key.to_s)
          sig  = sig_to_hex(hmac.sign(string_to_sign))

          temp_url_options = {
            :scheme => scheme,
            :host   => host,
            :port   => port,
            :path   => object_path_escaped,
            :query  => "temp_url_sig=#{sig}&temp_url_expires=#{expires}"
          }
          URI::Generic.build(temp_url_options).to_s
        end