Finished login handling.

controllers/login.go

@@ -1,49 +1,85 @@
 package controllers
 
 import (
+	"fmt"
+
+	"goweb/auth"
+	"goweb/ent"
 	"goweb/ent/user"
 	"goweb/msg"
 
-	"golang.org/x/crypto/bcrypt"
-
 	"github.com/labstack/echo/v4"
 )
 
-type Login struct {
-	Controller
-}
+type (
+	Login struct {
+		Controller
+		form LoginForm
+	}
+
+	LoginForm struct {
+		Username string `form:"username" validate:"required"`
+		Password string `form:"password" validate:"required"`
+	}
+)
 
 func (l *Login) Get(c echo.Context) error {
 	p := NewPage(c)
 	p.Layout = "auth"
 	p.Name = "login"
 	p.Title = "Log in"
-	p.Data = "This is the login page"
+	p.Data = l.form
 	return l.RenderPage(c, p)
 }
 
 func (l *Login) Post(c echo.Context) error {
-	name := c.FormValue("username")
-	pw := c.FormValue("password")
-
-	if name == "" || pw == "" {
-		msg.Warning(c, "All fields are required.")
+	// Parse the form values
+	if err := c.Bind(&l.form); err != nil {
+		c.Logger().Errorf("unable to parse login form: %v", err)
+		msg.Danger(c, "An error occurred. Please try again.")
 		return l.Get(c)
 	}
 
+	// Validate the form
+	if err := c.Validate(l.form); err != nil {
+		msg.Danger(c, "All fields are required.")
+		return l.Get(c)
+	}
+
+	// Attempt to load the user
 	u, err := l.Container.ORM.User.
 		Query().
-		Where(user.Username(name)).
+		Where(user.Username(l.form.Username)).
 		First(c.Request().Context())
 
 	if err != nil {
-		c.Logger().Errorf("error querying user during login: %v", err)
-	} else {
-		err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(pw))
-		if err != nil {
+		switch err.(type) {
+		case *ent.NotFoundError:
 			msg.Danger(c, "Invalid credentials. Please try again.")
+			return l.Get(c)
+		default:
+			c.Logger().Errorf("error querying user during login: %v", err)
+			msg.Danger(c, "An error occurred. Please try again.")
+			return l.Get(c)
 		}
+
 	}
 
-	return l.Get(c)
+	// Check if the password is correct
+	err = auth.CheckPassword(l.form.Password, u.Password)
+	if err != nil {
+		msg.Danger(c, "Invalid credentials. Please try again.")
+		return l.Get(c)
+	}
+
+	// Log the user in
+	err = auth.Login(c, u.ID)
+	if err != nil {
+		c.Logger().Errorf("unable to log in user %d: %v", u.ID, err)
+		msg.Danger(c, "An error occurred. Please try again.")
+		return l.Get(c)
+	}
+
+	msg.Success(c, fmt.Sprintf("Welcome back, %s. You are now logged in.", u.Username))
+	return l.Redirect(c, "home")
 }

middleware/auth.go

@@ -14,14 +14,19 @@ import (
 func LoadAuthenticatedUser(orm *ent.Client) echo.MiddlewareFunc {
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(c echo.Context) error {
-			if userID, err := auth.GetUserID(c); err != nil {
+			if userID, err := auth.GetUserID(c); err == nil {
 				u, err := orm.User.Query().
 					Where(user.ID(userID)).
 					First(c.Request().Context())
 
-				if err == nil {
+				switch err.(type) {
+				case *ent.NotFoundError:
+					c.Logger().Debug("auth user not found: %d", userID)
+				case nil:
 					c.Set(context.AuthenticatedUserKey, u)
 					c.Logger().Info("auth user loaded in to context: %d", userID)
+				default:
+					c.Logger().Errorf("error querying for authenticated user: %v", err)
 				}
 			}
 

views/pages/login.gohtml

@@ -1,15 +1,15 @@
 {{define "content"}}
     <form method="post">
         <div class="field">
-            <label for="" class="label">Username</label>
+            <label for="login" class="label">Username</label>
             <div class="control">
-                <input type="textfield" name="username" class="input" required>
+                <input id="login" type="text" name="username" class="input" value="{{.Data.Username}}" required>
             </div>
         </div>
         <div class="field">
-            <label for="" class="label">Password</label>
+            <label for="password" class="label">Password</label>
             <div class="control">
-                <input type="password" name="password" placeholder="*******" class="input" required>
+                <input id="password" type="password" name="password" placeholder="*******" class="input" required>
             </div>
         </div>
         <div class="field is-grouped">