AUTHENTICATION.md

Authentication & Layout Implementation

✅ Completed Features

1. Configuration Fix

• ✅ Removed serverActions: true from next.config.js (default in Next.js 14)
• ✅ Added bcrypt and jose dependencies for authentication

2. Authentication System

Server Actions (actions/auth.ts)

• ✅ login() - Validates credentials and creates session
• ✅ logout() - Destroys session and logs activity
• ✅ getSession() - Retrieves current session
• ✅ getCurrentUser() - Gets current user details

Authentication Utilities (lib/auth.ts)

• ✅ JWT-based session management using JOSE
• ✅ Password hashing with bcrypt
• ✅ Session encryption/decryption
• ✅ Cookie-based session storage

Middleware (middleware.ts)

• ✅ Route protection for /dashboard, /pos, and other protected routes
• ✅ Automatic redirect to /login for unauthenticated users
• ✅ Session validation on each request
• ✅ Public routes: /login, /api/auth

3. Login UI

Login Page (app/(auth)/login/page.tsx)

• ✅ Clean, modern design with Shadcn UI components
• ✅ Form validation
• ✅ Error handling
• ✅ Remember me functionality
• ✅ Auto-redirect if already logged in

Login Form Component (components/auth/login-form.tsx)

• ✅ Client-side form handling
• ✅ Loading states
• ✅ Error display
• ✅ Disabled state during submission

4. Dashboard Layout

Layout (app/(dashboard)/layout.tsx)

• ✅ Server-side authentication check
• ✅ Responsive sidebar (hidden on mobile)
• ✅ Header with user info and logout
• ✅ Main content area

Sidebar Component (components/layout/sidebar.tsx)

• ✅ Navigation menu with icons
• ✅ Active route highlighting
• ✅ Menu items:
  • Dashboard
  • POS
  • Products
  • Sales
  • Purchases
  • Stock
  • Customers
  • Reports
  • Settings

Header Component (components/layout/header.tsx)

• ✅ User avatar with initials
• ✅ User dropdown menu
• ✅ Logout functionality
• ✅ Responsive design

Dashboard Page (app/(dashboard)/dashboard/page.tsx)

• ✅ Welcome message
• ✅ Stats cards (placeholder for now)
• ✅ Recent transactions section
• ✅ Top selling products section

5. POS Layout

Layout (app/(pos)/layout.tsx)

• ✅ Full-screen layout (no sidebar)
• ✅ Top header bar with:
  • Back to Dashboard button
  • User info
  • Logout button
• ✅ Full-screen content area

POS Page (app/(pos)/pos/page.tsx)

• ✅ Two-column layout:
  • Left: Product selection area
  • Right: Shopping cart
• ✅ Placeholder for POS functionality

🔐 Security Features

1. Password Hashing: Uses bcrypt with salt rounds
2. JWT Sessions: Secure token-based authentication
3. HTTP-only Cookies: Prevents XSS attacks
4. Session Expiration: 30-day expiration with validation
5. Route Protection: Middleware protects all sensitive routes
6. Activity Logging: All login/logout attempts are logged

📁 File Structure

app/
├── (auth)/
│   ├── layout.tsx          # Auth layout (no sidebar)
│   └── login/
│       └── page.tsx        # Login page
├── (dashboard)/
│   ├── layout.tsx           # Dashboard layout with sidebar
│   └── dashboard/
│       └── page.tsx        # Dashboard home
├── (pos)/
│   ├── layout.tsx           # POS full-screen layout
│   └── pos/
│       └── page.tsx        # POS interface
└── page.tsx                # Root (redirects to login/dashboard)

components/
├── auth/
│   └── login-form.tsx       # Login form component
├── layout/
│   ├── header.tsx          # Header with user menu
│   └── sidebar.tsx         # Navigation sidebar
└── ui/                     # Shadcn UI components

actions/
└── auth.ts                 # Authentication server actions

lib/
└── auth.ts                 # Auth utilities (JWT, sessions)

middleware.ts               # Route protection middleware

🚀 Usage

Login

1. Navigate to /login
2. Enter username and password
3. Click "Sign In"
4. Redirected to /dashboard on success

Logout

1. Click user avatar in header
2. Click "Log out"
3. Session destroyed and redirected to /login

Protected Routes

All routes under /dashboard, /pos, /products, etc. are automatically protected by middleware.

🔧 Environment Variables

Add to .env:

AUTH_SECRET=your-secret-key-change-in-production
DATABASE_URL="file:./dev.db"

📝 Next Steps

1. Create seed script to add default admin user
2. Implement user management (CRUD)
3. Add role-based permissions
4. Implement session timeout warnings
5. Add password reset functionality