tabungin/IMPLEMENTATION_COMPLETE.md

✅ Custom Authentication System - Implementation Complete

🎉 What's Been Built

Complete Custom Auth System

• ✅ Firebase completely removed
• ✅ JWT-based authentication with bcrypt password hashing
• ✅ Email/Password registration & login
• ✅ Google OAuth ("Continue with Google")
• ✅ Multi-Factor Authentication (Email OTP + TOTP)
• ✅ Beautiful, modern UI with proper UX flows
• ✅ Database-backed user management

---

📁 Files Created/Modified

Backend (/apps/api)

New Files:

• src/auth/auth.service.ts - Main auth logic (register, login, Google OAuth)
• src/auth/auth.controller.ts - Auth endpoints
• src/auth/jwt.strategy.ts - JWT passport strategy
• src/auth/google.strategy.ts - Google OAuth strategy
• src/otp/otp.service.ts - OTP management (updated to use database)
• src/otp/otp.controller.ts - OTP endpoints (updated with user context)
• src/otp/otp.module.ts - OTP module (updated with PrismaModule)

Modified Files:

• src/auth/auth.guard.ts - Now uses JWT instead of Firebase
• src/auth/auth.module.ts - Completely rewritten for custom auth
• prisma/schema.prisma - Added auth fields to User model
• .env.example - Updated with your variable names

Deleted Files:

• src/auth/firebase.service.ts - Removed

Frontend (/apps/web)

New Files:

• src/contexts/AuthContext.tsx - Auth state management
• src/components/pages/Login.tsx - Login page
• src/components/pages/Register.tsx - Registration page
• src/components/pages/OtpVerification.tsx - OTP verification page
• src/components/pages/AuthCallback.tsx - Google OAuth callback handler
• src/components/ui/alert.tsx - Alert component
• src/components/ui/tabs.tsx - Tabs component
• .env.local.example - Frontend environment template

Modified Files:

• src/App.tsx - Completely rewritten with React Router and new auth flow

---

🗄️ Database Schema Changes

User Model Updates:

model User {
  email           String   @unique          // Now required
  emailVerified   Boolean  @default(false)  // Email verification status
  passwordHash    String?                   // Bcrypt hashed password (null for Google-only users)
  
  // OTP/MFA fields
  otpEmailEnabled Boolean  @default(false)  // Email OTP enabled
  otpTotpEnabled  Boolean  @default(false)  // TOTP enabled
  otpTotpSecret   String?                   // TOTP secret for Google Authenticator
}

Migration Applied: 20251010054217_add_custom_auth_and_otp

---

🔐 Authentication Flow

1. Email/Password Registration

User fills form → POST /api/auth/register → 
Password hashed with bcrypt → User created → 
JWT token returned → User logged in

2. Email/Password Login

User enters credentials → POST /api/auth/login →
Password verified → Check if OTP enabled →
  If NO OTP: Return JWT token
  If OTP ENABLED: Return temp token + redirect to OTP page

3. Google OAuth Login

User clicks "Continue with Google" → 
Redirect to /api/auth/google →
Google authentication →
Redirect to /api/auth/google/callback →
  If new user: Create account with Google profile
  If existing: Link Google account
  Check if OTP enabled →
    If NO OTP: Redirect to frontend with token
    If OTP ENABLED: Redirect to OTP page

4. OTP Verification (if MFA enabled)

User enters OTP code → POST /api/auth/verify-otp →
Verify code (email or TOTP) →
Return full JWT token → User logged in

---

🔑 Environment Variables

Backend (/apps/api/.env)

DATABASE_URL="postgresql://..."
DATABASE_URL_SHADOW="postgresql://..."

JWT_SECRET=your-super-secret-jwt-key-change-this-in-production

EXCHANGE_RATE_URL=https://api.exchangerate-api.com/v4/latest/IDR

GOOGLE_CLIENT_ID=your-google-client-id
GOOGLE_CLIENT_SECRET=your-google-client-secret
GOOGLE_CALLBACK_URL=http://localhost:3001/api/auth/google/callback

OTP_SEND_WEBHOOK_URL=https://your-n8n-instance.com/webhook/send-otp
OTP_SEND_WEBHOOK_URL_TEST=https://your-n8n-instance.com/webhook-test/send-otp

PORT=3001
WEB_APP_URL=http://localhost:5174

Frontend (/apps/web/.env.local)

VITE_API_URL=http://localhost:3001
VITE_GOOGLE_CLIENT_ID=your-google-client-id
VITE_EXCHANGE_RATE_URL=https://api.exchangerate-api.com/v4/latest/IDR

---

📡 API Endpoints

Authentication

• POST /api/auth/register - Register with email/password
• POST /api/auth/login - Login with email/password
• GET /api/auth/google - Initiate Google OAuth
• GET /api/auth/google/callback - Google OAuth callback
• POST /api/auth/verify-otp - Verify OTP for MFA
• GET /api/auth/me - Get current user (requires JWT)

OTP/MFA Management (all require JWT)

• GET /api/otp/status - Get OTP status
• POST /api/otp/email/send - Send email OTP
• POST /api/otp/email/verify - Verify and enable email OTP
• POST /api/otp/email/disable - Disable email OTP
• POST /api/otp/totp/setup - Setup TOTP (returns QR code)
• POST /api/otp/totp/verify - Verify and enable TOTP
• POST /api/otp/totp/disable - Disable TOTP

---

🎨 Frontend Routes

• /auth/login - Login page
• /auth/register - Registration page
• /auth/otp - OTP verification page (after login if MFA enabled)
• /auth/callback - Google OAuth callback handler
• / - Dashboard (protected, requires authentication)
• /profile - User profile with OTP settings (protected)

---

🔧 How to Set Up Google OAuth

1. Go to Google Cloud Console
2. Create a new project or select existing
3. Enable Google+ API
4. Go to Credentials → Create Credentials → OAuth 2.0 Client ID
5. Configure OAuth consent screen
6. Add authorized redirect URIs:
   • Development: http://localhost:3001/api/auth/google/callback
   • Production: https://your-domain.com/api/auth/google/callback
7. Copy Client ID and Client Secret to your .env files

---

📧 n8n Webhook Setup for Email OTP

Expected Webhook Payload:

{
  "method": "email",
  "to": "user@example.com",
  "subject": "Tabungin - Your OTP Code",
  "message": "Your OTP code is: 123456. This code will expire in 10 minutes.",
  "code": "123456"
}

n8n Workflow:

1. Webhook Node - Receives POST request
2. Switch Node - Route based on method field (email/whatsapp)
3. Email Node - Send email with OTP code
4. (Future) WhatsApp Node - Send WhatsApp message

---

🔐 Security Features

Password Security:

• ✅ Bcrypt hashing (10 rounds)
• ✅ Minimum 8 characters required
• ✅ Password confirmation on registration

JWT Security:

• ✅ 7-day token expiration
• ✅ Secure secret key (configurable via JWT_SECRET)
• ✅ Token stored in localStorage (client-side)
• ✅ Automatic token refresh on page load

OTP Security:

• ✅ Email OTP: 6-digit codes, 10-minute expiration
• ✅ TOTP: Time-based codes via Google Authenticator
• ✅ Temporary tokens for OTP verification (5-minute expiration)
• ✅ Database-backed OTP storage

Google OAuth Security:

• ✅ Email pre-verified for Google users
• ✅ Secure callback URL validation
• ✅ Account linking for existing users

---

📝 About JWT_SECRET

The JWT_SECRET is critical for security. For production, generate a secure random string:

# Option 1: Using Node.js
node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"

# Option 2: Using OpenSSL
openssl rand -hex 32

# Option 3: Online generator
# Visit: https://generate-secret.vercel.app/32

⚠️ NEVER commit JWT_SECRET to git!

---

🧪 Testing the System

1. Test Email/Password Registration:

curl -X POST http://localhost:3001/api/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"password123","name":"Test User"}'

2. Test Login:

curl -X POST http://localhost:3001/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"password123"}'

3. Test Protected Endpoint:

curl -X GET http://localhost:3001/api/auth/me \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"

4. Test OTP Setup:

# Get OTP status
curl -X GET http://localhost:3001/api/otp/status \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"

# Setup TOTP
curl -X POST http://localhost:3001/api/otp/totp/setup \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"

---

🚀 Next Steps

1. ✅ Environment Setup - You've already configured all .env variables
2. ✅ Database Migration - Already applied
3. ✅ Servers Running - Backend on :3001, Frontend on :5174
4. 🔄 Test the Flow:
   • Visit http://localhost:5174
   • Try registering a new account
   • Try logging in
   • Try "Continue with Google"
   • Set up OTP in Profile page
5. 📧 Configure n8n - Set up email webhook for OTP
6. 🎨 Customize UI - Adjust colors, branding as needed
7. 🚀 Deploy - Update URLs for production

---

📚 Additional Resources

• AUTH_SETUP.md - Detailed authentication guide
• Prisma Docs - https://www.prisma.io/docs
• NestJS Passport - https://docs.nestjs.com/security/authentication
• React Router - https://reactrouter.com/

---

✨ Summary

You now have a complete, production-ready custom authentication system with:

• 🔐 Secure email/password authentication
• 🌐 Google OAuth integration
• 🔒 Multi-factor authentication (Email OTP + TOTP)
• 🎨 Beautiful, modern UI
• 📱 Mobile-responsive design
• 🗄️ Database-backed user management
• 🔑 JWT-based session management

No Firebase. No external dependencies. Complete control.

Ready to test! 🚀