Notification Subscription Feature - Complete Implementation

Overview

Complete end-to-end implementation of the notification subscription feature for the Tikka raffle platform. Users can subscribe to receive notifications when a raffle ends or when they win.

Feature Summary

✅ Frontend UI Components

Subscribe/unsubscribe buttons on raffle detail pages
Compact bell icon for raffle cards
Settings page with notification preferences
Real-time subscription status updates

✅ Backend API

RESTful endpoints for subscription management
JWT authentication integration
Supabase database storage
Efficient querying with indexes

✅ Database

Notifications table with proper constraints
Indexed for performance
RLS enabled for security

Architecture

┌─────────────────────────────────────────────────────────────┐
│                         Frontend                             │
│  ┌──────────────────────────────────────────────────────┐  │
│  │  Components                                           │  │
│  │  - NotificationSubscribeButton                        │  │
│  │  - NotificationBellIcon                               │  │
│  │  - NotificationPreferences                            │  │
│  │  - Settings Page                                      │  │
│  └──────────────────────────────────────────────────────┘  │
│  ┌──────────────────────────────────────────────────────┐  │
│  │  Hooks & Services                                     │  │
│  │  - useNotifications (React Hook)                      │  │
│  │  - notificationService (API Client)                   │  │
│  └──────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────┘
                            │
                            │ HTTPS/JWT
                            ▼
┌─────────────────────────────────────────────────────────────┐
│                         Backend                              │
│  ┌──────────────────────────────────────────────────────┐  │
│  │  REST API (NestJS)                                    │  │
│  │  - POST /notifications/subscribe                      │  │
│  │  - DELETE /notifications/subscribe/:raffleId          │  │
│  │  - GET /notifications/subscriptions                   │  │
│  └──────────────────────────────────────────────────────┘  │
│  ┌──────────────────────────────────────────────────────┐  │
│  │  Services                                             │  │
│  │  - NotificationsService (Business Logic)              │  │
│  │  - NotificationService (Supabase Integration)         │  │
│  └──────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────┘
                            │
                            │ Supabase Client
                            ▼
┌─────────────────────────────────────────────────────────────┐
│                       Database                               │
│  ┌──────────────────────────────────────────────────────┐  │
│  │  notifications table                                  │  │
│  │  - id (UUID)                                          │  │
│  │  - raffle_id (INTEGER)                                │  │
│  │  - user_address (VARCHAR)                             │  │
│  │  - channel (VARCHAR)                                  │  │
│  │  - created_at (TIMESTAMP)                             │  │
│  │  UNIQUE(raffle_id, user_address)                      │  │
│  └──────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────┘

User Flow

1. Subscribe to Raffle Notifications

User visits raffle detail page
    ↓
Sees "Stay Updated" section with "Notify Me" button
    ↓
Clicks button (if not signed in, prompted to authenticate)
    ↓
Frontend calls POST /notifications/subscribe with JWT
    ↓
Backend validates JWT and creates subscription
    ↓
Subscription stored in database
    ↓
Frontend updates button to show "Unsubscribe"
    ↓
Success message displayed

2. Manage Subscriptions in Settings

User navigates to /settings
    ↓
Clicks "Notifications" tab
    ↓
Frontend calls GET /notifications/subscriptions
    ↓
Backend returns all user subscriptions
    ↓
User sees list of active subscriptions
    ↓
User clicks unsubscribe on a raffle
    ↓
Frontend calls DELETE /notifications/subscribe/:raffleId
    ↓
Backend removes subscription
    ↓
Frontend updates list

Implementation Details

Frontend (Client)

Location: client/

Key Files:

src/services/notificationService.ts - API client
src/hooks/useNotifications.ts - React hook
src/components/NotificationSubscribeButton.tsx - Main button
src/components/NotificationBellIcon.tsx - Compact icon
src/components/NotificationPreferences.tsx - Settings panel
src/pages/Settings.tsx - Settings page
src/config/api.ts - API endpoints
src/types/types.ts - TypeScript types

Documentation: client/docs/NOTIFICATIONS.md

Backend (Server)

Location: backend/

Key Files:

src/api/rest/notifications/notifications.controller.ts - HTTP endpoints
src/api/rest/notifications/notifications.service.ts - Business logic
src/api/rest/notifications/notifications.module.ts - Module config
src/services/notification.service.ts - Supabase integration
src/api/rest/notifications/dto/subscribe.dto.ts - Request validation
database/migrations/002_notifications.sql - Database schema

Documentation: backend/NOTIFICATION_IMPLEMENTATION.md

Setup Instructions

1. Database Setup

Run the migration in Supabase SQL Editor:

# Navigate to Supabase dashboard
# Go to SQL Editor
# Copy contents of backend/database/migrations/002_notifications.sql
# Execute the SQL

2. Backend Setup

cd backend

# Install dependencies (if not already installed)
npm install

# Ensure environment variables are set
# SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY, JWT_SECRET

# Start the server
npm run dev

Backend will be available at http://localhost:3001

3. Frontend Setup

cd client

# Install dependencies (if not already installed)
npm install

# Ensure environment variables are set
# VITE_API_BASE_URL=http://localhost:3001

# Start the development server
npm run dev

Frontend will be available at http://localhost:5173

Testing

End-to-End Test Flow

Start both servers (backend and frontend)
Sign in with wallet
- Connect Stellar wallet
- Complete SIWS authentication
- Verify JWT token is stored
Subscribe to raffle
- Navigate to a raffle detail page
- Click "Notify Me" button
- Verify button changes to "Unsubscribe"
- Check success message appears
View subscriptions
- Navigate to /settings
- Click "Notifications" tab
- Verify subscription appears in list
Unsubscribe
- Click unsubscribe button
- Verify subscription is removed from list
Test without auth
- Sign out
- Try to subscribe
- Verify authentication prompt appears

API Testing with cURL

See backend/NOTIFICATION_IMPLEMENTATION.md for detailed cURL examples.

API Reference

POST /notifications/subscribe

Subscribe to raffle notifications.

Authentication: Required (JWT)

Request:

{
  "raffleId": 123,
  "channel": "email"
}

Response (201):

{
  "id": "uuid",
  "raffle_id": 123,
  "user_address": "GXXX...",
  "channel": "email",
  "created_at": "2024-02-25T10:30:00Z"
}

DELETE /notifications/subscribe/:raffleId

Unsubscribe from raffle notifications.

Authentication: Required (JWT)

Response: 204 No Content

GET /notifications/subscriptions

Get all user subscriptions.

Authentication: Required (JWT)

Response (200):

[
  {
    "id": "uuid",
    "raffle_id": 123,
    "user_address": "GXXX...",
    "channel": "email",
    "created_at": "2024-02-25T10:30:00Z"
  }
]

Database Schema

CREATE TABLE notifications (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  raffle_id INTEGER NOT NULL,
  user_address VARCHAR(56) NOT NULL,
  channel VARCHAR(20) NOT NULL DEFAULT 'email',
  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
  CONSTRAINT unique_raffle_user UNIQUE (raffle_id, user_address)
);

-- Indexes for performance
CREATE INDEX idx_notifications_raffle_id ON notifications(raffle_id);
CREATE INDEX idx_notifications_user_address ON notifications(user_address);
CREATE INDEX idx_notifications_created_at ON notifications(created_at DESC);

Security

✅ JWT authentication required for all endpoints
✅ Users can only manage their own subscriptions
✅ Rate limiting via global throttler guard
✅ Input validation with DTOs
✅ SQL injection protection via Supabase
✅ Unique constraint prevents duplicates
✅ RLS enabled for future policies

Performance

✅ Database indexes for fast queries
✅ Efficient Supabase connection pooling
✅ Optimized React hooks with proper dependencies
✅ Minimal re-renders with state management
✅ Lazy loading of subscription data

Future Enhancements

Phase 1: Notification Delivery

Email service integration (SendGrid/AWS SES)
Push notification service (Firebase/OneSignal)
Event listeners for raffle end/win
Notification templates

Phase 2: Advanced Features

Phase 3: Analytics

Subscription metrics dashboard
Delivery success tracking
User engagement analytics
A/B testing for notifications

Troubleshooting

Frontend Issues

Subscription button not working

Check if user is authenticated
Verify JWT token in sessionStorage
Check browser console for errors
Verify API_BASE_URL is correct

Subscriptions not loading

Check network tab for API calls
Verify backend is running
Check JWT token is valid
Review backend logs

Backend Issues

Cannot create subscription

Verify database migration ran
Check Supabase connection
Review server logs
Verify JWT secret matches

Duplicate subscription error

This is expected behavior
Frontend should handle gracefully
Returns existing subscription

Documentation

Frontend: client/docs/NOTIFICATIONS.md
Frontend Implementation: client/NOTIFICATION_IMPLEMENTATION.md
Backend Implementation: backend/NOTIFICATION_IMPLEMENTATION.md
This Document: Complete feature overview

Issue Resolution

This implementation resolves GitHub Issue #27:

✅ Users can subscribe to raffle notifications ✅ Backend supports POST /notifications/subscribe ✅ Client offers clear subscription flow ✅ Settings page for notification preferences ✅ JWT authentication integrated ✅ Database table created ✅ API endpoints implemented ✅ UI components created ✅ Documentation complete

Next Steps

Deploy to staging
- Run database migration on staging
- Deploy backend with new endpoints
- Deploy frontend with new components
- Test end-to-end flow
Implement notification delivery
- Choose email service provider
- Set up event listeners
- Create notification templates
- Test delivery flow
Monitor and optimize
- Track subscription metrics
- Monitor API performance
- Gather user feedback
- Iterate on UX

Support

For questions or issues:

Review documentation in client/docs/ and backend/
Check server logs for errors
Verify database schema in Supabase
Test API endpoints with cURL
Review browser console for frontend errors

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Notification Subscription Feature - Complete Implementation

Overview

Feature Summary

Architecture

User Flow

1. Subscribe to Raffle Notifications

2. Manage Subscriptions in Settings

Implementation Details

Frontend (Client)

Backend (Server)

Setup Instructions

1. Database Setup

2. Backend Setup

3. Frontend Setup

Testing

End-to-End Test Flow

API Testing with cURL

API Reference

POST /notifications/subscribe

DELETE /notifications/subscribe/:raffleId

GET /notifications/subscriptions

Database Schema

Security

Performance

Future Enhancements

Phase 1: Notification Delivery

Phase 2: Advanced Features

Phase 3: Analytics

Troubleshooting

Frontend Issues

Backend Issues

Documentation

Issue Resolution

Next Steps

Support