Go - Web Application 8

User authentication

Open up your handlers.go file and add placeholders for the five new handler functions as follows:

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...")
}

Then when that’s done, let’s create the corresponding routes in the routes.go file:

package main

import (
    "net/http"

    "github.com/justinas/alice"
)

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)
}

Finally, we’ll also need to update the nav.html partial to include navigation items for the new pages:

{{define "nav"}}
        <nav>
            <div>
                <a href="/">Home</a>
                <a href="/snippet/create">Create snippet</a>
            </div>
            <div>
                <a href="/user/signup">Signup</a>
                <a href="/user/login">Login</a>
                <form action="/user/logout" method="POST">
                    <button>Logout</button>
                </form>
            </div>
        </nav>
{{end}}