ch11.6

cmd/web/handlers.go

@@ -219,7 +219,7 @@ func (app *application) userLogoutPost(w http.ResponseWriter, r *http.Request) {
 		app.serverError(w, err)
 		return
 	}
-	app.sessionManager.Remove(r.Context(), "authenticatedUserId")
+	app.sessionManager.Remove(r.Context(), "authenticatedUserID")
 	app.sessionManager.Put(r.Context(), "flash", "You've been logged out succefully!")
 
 	http.Redirect(w, r, "/", http.StatusSeeOther)

cmd/web/helpers.go

@@ -40,3 +40,7 @@ func (app *application) decodePostForm(r *http.Request, snippetForm any) error {
 	}
 	return nil
 }
+
+func (app *application) isAuthenticated(r *http.Request) bool {
+	return app.sessionManager.Exists(r.Context(), "authenticatedUserID")
+}

cmd/web/middleware.go

@@ -38,3 +38,14 @@ func (app *application) recoverPanic(next http.Handler) http.Handler {
 		next.ServeHTTP(w, r)
 	})
 }
+
+func (app *application) requireAuthentication(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if !app.isAuthenticated(r) {
+			http.Redirect(w, r, "/user/login", http.StatusSeeOther)
+			return
+		}
+		w.Header().Set("Cache-Control", "no-store")
+		next.ServeHTTP(w, r)
+	})
+}

cmd/web/routes.go

@@ -21,14 +21,17 @@ func (app *application) routes() http.Handler {
 
 	router.Handler(http.MethodGet, "/", dynamic.ThenFunc(app.home))
 	router.Handler(http.MethodGet, "/snippet/view/:id", dynamic.ThenFunc(app.snippetView))
-	router.Handler(http.MethodGet, "/snippet/create", dynamic.ThenFunc(app.snippetCreate))
-	router.Handler(http.MethodPost, "/snippet/create", dynamic.ThenFunc(app.snippetCreatePost))
 
 	router.Handler(http.MethodGet, "/user/signup", dynamic.ThenFunc(app.userSignup))
 	router.Handler(http.MethodPost, "/user/signup", dynamic.ThenFunc(app.userSignupPost))
 	router.Handler(http.MethodGet, "/user/login", dynamic.ThenFunc(app.userLogin))
 	router.Handler(http.MethodPost, "/user/login", dynamic.ThenFunc(app.userLoginPost))
-	router.Handler(http.MethodPost, "/user/logout", dynamic.ThenFunc(app.userLogoutPost))
+
+	protected := dynamic.Append(app.requireAuthentication)
+
+	router.Handler(http.MethodGet, "/snippet/create", protected.ThenFunc(app.snippetCreate))
+	router.Handler(http.MethodPost, "/snippet/create", protected.ThenFunc(app.snippetCreatePost))
+	router.Handler(http.MethodPost, "/user/logout", protected.ThenFunc(app.userLogoutPost))
 
 	standard := alice.New(app.recoverPanic, app.logRequest, secureHeaders)
 	return standard.Then(router)

cmd/web/templates.go

@@ -15,6 +15,7 @@ type templateData struct {
 	Snippets        []*models.Snippet
 	Form            any
 	Flash           string
+	IsAuthenticated bool
 }
 
 func humanDate(t time.Time) string {
@@ -29,6 +30,7 @@ func (app *application) newTemplateData(r *http.Request) *templateData {
 	return &templateData{
 		CurrentYear:     time.Now().Year(),
 		Flash:           app.sessionManager.PopString(r.Context(), "flash"),
+		IsAuthenticated: app.isAuthenticated(r),
 	}
 }
 

ui/html/partials/nav.tmpl

@@ -2,14 +2,19 @@
 <nav>
     <div>
         <a href='/'>Home</a>
+        {{if .IsAuthenticated}}
             <a href='/snippet/create'>Create snippet</a>
+        {{end}}
     </div>
     <div>
-        <a href='/user/signup'>Signup</a>
-        <a href='/user/login'>Login</a>
+        {{if .IsAuthenticated}}
             <form action='/user/logout' method='POST'>
                 <button>Logout</button>
             </form>
+        {{else}}
+            <a href='/user/signup'>Signup</a>
+            <a href='/user/login'>Login</a>
+        {{end}}
     </div>
 </nav>
 {{end}}