r := mux.NewRouter()
// Single handler
r.HandleFunc("/form", use(http.HandlerFunc(formHandler), csrf, logging,)
// All handlers
http.Handle("/", recovery(r))
// Sub-routers
apiMiddleware := []func(http.Handler) http.Handler{logging, apiAuth, json}
api := router.PathPrefix("/api").SubRouter()
api.Handle("/users", use(usersHandler, apiMiddleware...))

func use(h http.Handler, middleware ...func(http.Handler) http.Handler) http.Handler {
    for _, m := range middleware {
        h = m(h)
    }
    return h
}

func csrf(h http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        // do stuff
        h.ServeHTTP(w, r)
        // do stuff after
    })
}

func formHandler(w http.ResponseWriter, r *http.Request) {
      // do stuff
}