ch11.3

cmd/web/handlers.go

@@ -19,6 +19,13 @@ type snippetCreateForm struct {
 	validator.Validator `form:"-"`
 }
 
+type userSignupForm struct {
+	Name                string `form:"name"`
+	Email               string `form:"email"`
+	Password            string `form:"password"`
+	validator.Validator `form:"-"`
+}
+
 func (app *application) render(w http.ResponseWriter, status int, page string, data *templateData) {
 	ts, ok := app.templateCache[page]
 	if !ok {
@@ -119,7 +126,41 @@ func (app *application) snippetCreatePost(w http.ResponseWriter, r *http.Request
 }
 
 func (app *application) userSignupPost(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintln(w, "Create a new user...")
+	var form userSignupForm
+	err := app.decodePostForm(r, &form)
+	if err != nil {
+		app.clientError(w, http.StatusBadRequest)
+		return
+	}
+
+	form.CheckField(validator.NotBlank(form.Name), "name", "This field cannot be blank")
+	form.CheckField(validator.NotBlank(form.Email), "email", "This field cannot be blank")
+	form.CheckField(validator.Matches(form.Email, validator.EmailRX), "email", "This field must be a valid email address")
+	form.CheckField(validator.NotBlank(form.Password), "password", "This field cannot be blank")
+	form.CheckField(validator.MinChars(form.Password, 8), "password", "This field must be at least 8 character long")
+
+	if !form.Valid() {
+		data := app.newTemplateData(r)
+		data.Form = form
+		app.render(w, http.StatusUnprocessableEntity, "signup.tmpl", data)
+		return
+	}
+
+	err = app.users.Insert(form.Name, form.Email, form.Password)
+	if err != nil {
+		if errors.Is(err, models.ErrDuplicateEmail) {
+			form.AddFieldError("email", "Email address already in use")
+
+			data := app.newTemplateData(r)
+			data.Form = form
+			app.render(w, http.StatusUnprocessableEntity, "signup.tmpl", data)
+		} else {
+			app.serverError(w, err)
+		}
+		return
+	}
+	app.sessionManager.Put(r.Context(), "flash", "Your singup was successful. Please log in.")
+	http.Redirect(w, r, "/user/login", http.StatusSeeOther)
 }
 
 func (app *application) userLoginPost(w http.ResponseWriter, r *http.Request) {
@@ -131,7 +172,9 @@ func (app *application) userLogoutPost(w http.ResponseWriter, r *http.Request) {
 }
 
 func (app *application) userSignup(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintln(w, "Display a HTML for signing up a new user...")
+	data := app.newTemplateData(r)
+	data.Form = userSignupForm{}
+	app.render(w, http.StatusOK, "signup.tmpl", data)
 }
 
 func (app *application) userLogin(w http.ResponseWriter, r *http.Request) {

cmd/web/helpers.go

@@ -24,7 +24,7 @@ func (app *application) notFound(w http.ResponseWriter) {
 	app.clientError(w, http.StatusNotFound)
 }
 
-func (app *application) decodePostForm(r *http.Request, snippetForm *snippetCreateForm) error {
+func (app *application) decodePostForm(r *http.Request, snippetForm any) error {
 	err := r.ParseForm()
 	if err != nil {
 		return err