lets-go:11.0 user login without peeking

just the bones here, not authenticating at all yet. going ahead with the chapter
now because i'm curious about the preferred way to authenticate; are we going to
put this on `UserModel` or some other `internal` locale, or just in `helpers.go`?

snippetbox/cmd/web/handlers.go

@@ -118,7 +118,7 @@ func (app *application) userSignup(w http.ResponseWriter, r *http.Request) {
 }
 
 
-// userSignup ...
+// userSignupPost ...
 func (app *application) userSignupPost(w http.ResponseWriter, r *http.Request) {
 	var form userSignupForm
 
@@ -148,3 +148,43 @@ func (app *application) userSignupPost(w http.ResponseWriter, r *http.Request) {
 
 	http.Redirect(w, r, "/", http.StatusSeeOther)
 }
+
+type userLoginForm struct {
+	Username    string  `form:"username"`
+	Password    string  `form:"password"`
+	validator.Validator `form:"-"`
+}
+
+// userLogin ...
+func (app *application) userLogin(w http.ResponseWriter, r *http.Request) {
+	data := app.newTemplateData(r)
+
+	data.Form = userLoginForm{}
+
+	app.render(w, r, http.StatusOK, "login.tmpl", data)
+}
+
+// userLoginPost ...
+func (app *application) userLoginPost(w http.ResponseWriter, r *http.Request) {
+	var form userSignupForm
+
+	err := app.decodePostForm(r, &form)
+	if err != nil {
+		app.clientError(w, http.StatusBadRequest)
+		return
+	}
+
+	form.CheckField(validator.NotBlank(form.Username), "username", "This field cannot be blank")
+	form.CheckField(validator.NotBlank(form.Password), "password", "This field cannot be blank")
+
+	if !form.Valid() {
+		data := app.newTemplateData(r)
+		data.Form = form
+		app.render(w, r, http.StatusUnprocessableEntity, "login.tmpl", data)
+		return
+	}
+
+	app.sessionManager.Put(r.Context(), "flash", fmt.Sprintf("LOGGED IN USER %s! (not really)", form.Username))
+
+	http.Redirect(w, r, "/", http.StatusSeeOther)
+}

snippetbox/cmd/web/routes.go

@@ -31,8 +31,8 @@ func (app *application) routes() http.Handler {
 	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.MethodGet, "/user/login", dynamic.ThenFunc(app.userLogin))
+	router.Handler(http.MethodPost, "/user/login", dynamic.ThenFunc(app.userLoginPost))
 
 	standard := alice.New(app.recoverPanic, app.logRequest, secureHeaders)
 

snippetbox/ui/html/pages/login.tmpl

@@ -0,0 +1,22 @@
+{{define "title"}}User Login{{end}}
+
+{{define "main"}}
+<form action='/user/login' method='POST'>
+  <div>
+    <label>Username:</label>
+    {{with .Form.FieldErrors.username}}
+    <label class='error'>{{.}}</label>
+    {{end}}
+    <input type='text' name='username' value='{{.Form.Username}}'>
+  </div>
+  <div>
+    <label>Password:</label>
+    {{with .Form.FieldErrors.password}}
+    <label class='error'>{{.}}</label>
+    {{end}}
+    <input type='text' name='password' value='{{.Form.Password}}'>
+  </div>
+  <div>
+    <input type='submit' value='Login'>
+  </div>
+{{end}}