You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: routes.go
    path of file: ./repos/go-oauth2-server/util/routes
    
    the code of the file until where you have to start completion: package routes

import (
	"net/http"

	"github.com/gorilla/mux"
	"github.com/urfave/negroni"
)

// Route ...
type Route struct {
	Name        string
	Method      string
	Pattern     string
	HandlerFunc http.HandlerFunc
	Middlewares []negroni.Handler
}

// AddRoutes adds routes to a router instance. If there are middlewares defined
// for a route, a new negroni app is created and wrapped as a http.Handler
func AddRoutes(routes []Route, router *mux.Router) {
	var (
		handler 
    
func AddRoutes(routes []Route, router *mux.Router) {
	var (
		handler http.Handler
		n       *negroni.Negroni
	)

	for _, route := range routes {
		// Add any specified middlewares
		if len(route.Middlewares) > 0 {
			n = negroni.New()

			for _, middleware := range route.Middlewares {
				n.Use(middleware)
			}

			// Wrap the handler in the negroni app with middlewares
			n.Use(negroni.Wrap(route.HandlerFunc))
			handler = n
		} else {
			handler = route.HandlerFunc
		}

		router.Methods(route.Method).
			Path(route.Pattern).
			Name(route.Name).
			Handler(handler)
	}
}