package main

...

func (app *application) userSignup(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Display a form for signing up a new user...")
}

func (app *application) userSignupPost(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Create a new user...")
}

func (app *application) userLogin(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Display a form for logging in a user...")
}

func (app *application) userLoginPost(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Authenticate and login the user...")
}

func (app *application) userLogoutPost(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Logout the user...")
}

package main

...

func (app *application) routes() http.Handler {
    mux := http.NewServeMux()

    fileServer := http.FileServer(http.Dir("./ui/static/"))
    mux.Handle("GET /static/", http.StripPrefix("/static", fileServer))

    dynamic := alice.New(app.sessionManager.LoadAndSave)

    mux.Handle("GET /{$}", dynamic.ThenFunc(app.home))
    mux.Handle("GET /snippet/view/{id}", dynamic.ThenFunc(app.snippetView))
    mux.Handle("GET /snippet/create", dynamic.ThenFunc(app.snippetCreate))
    mux.Handle("POST /snippet/create", dynamic.ThenFunc(app.snippetCreatePost))

    // Add the five new routes, all of which use our 'dynamic' middleware chain.
    mux.Handle("GET /user/signup", dynamic.ThenFunc(app.userSignup))
    mux.Handle("POST /user/signup", dynamic.ThenFunc(app.userSignupPost))
    mux.Handle("GET /user/login", dynamic.ThenFunc(app.userLogin))
    mux.Handle("POST /user/login", dynamic.ThenFunc(app.userLoginPost))
    mux.Handle("POST /user/logout", dynamic.ThenFunc(app.userLogoutPost))

    standard := alice.New(app.recoverPanic, app.logRequest, commonHeaders)
    return standard.Then(mux)
}