overview
🎯 Our Aim (Vision Statement)
To build a reusable, production-grade, plug-and-play authentication service that handles everything a project needs for secure user access — with APIs and integrations that save dev teams 100+ hours.
Author: Jeet Solanki
🛠️ Core Functional Goals
| Area | Goals |
|---|---|
| 🔑 User Auth | Login, Signup, Logout |
| 🔐 Secure Tokens | JWT, refresh tokens, expiring tokens |
| 🌍 OAuth2.0 | Google, GitHub, Apple login |
| 📱 OTP Verification | Via email, WhatsApp, SMS |
| 🛡 Spring Security | Secure endpoints, roles, scopes |
| 🧾 Session/Device Management | Track login devices, sessions |
| 🎛 Admin Control | Role management, ban, reset |
| ⚙️ Pluggable via API | Anyone can consume via REST API |
🧱 Architecture
🔧 Type: Modular Monolith (for MVP)
| Layer | Purpose |
|---|---|
| API Layer | REST Controllers (Exposes endpoints) |
| Service Layer | Auth logic, user management |
| Security Layer | Token generation/validation |
| Integration Layer | Email/OTP providers (pluggable) |
| Persistence Layer | JPA + PostgreSQL |
| DTO/Model Layer | Transfer data cleanly |
➡️ Easily upgradable to microservices later.
🧠 Features Your Auth Service Will Offer
| Group | Feature |
|---|---|
| 🔑 Auth | Register, Login, Logout |
| 🔒 Security | JWT, Refresh Tokens, Token Expiry |
| 🌐 Social Login | Google OAuth2.0 (GitHub/Apple later) |
| 📩 OTP Channels | Email OTP, WhatsApp OTP, SMS OTP |
| 👥 User Profiles | Email, Name, Phone, Verified Flags |
| 🔐 Roles & Permissions | Admin, User, Guest (extendable) |
| 📱 Device Tracking | Track active sessions/devices (optional) |
| 📤 Integration | APIs for other apps to consume |
| 🧾 Logs | Login logs, failed attempts |
| 🌍 i18n Ready | Support for multiple languages |
| 🧪 Tests | Unit tests for each module |
🧭 Design Patterns / Practices
- ✅ Hexagonal Architecture (Ports & Adapters) — optional later
- ✅ Strategy Pattern — for OTP providers (email, WhatsApp, SMS)
- ✅ Builder Pattern — for JWT claims
- ✅ Clean Code + DTO Mapping
- ✅ Exception Handling via Global Advice
- ✅ Configuration-Driven Providers (via
application.yml)
🧩 Database Design (PostgreSQL Recommended)
Tables:
| Table | Purpose |
|---|---|
users | Core user data (email, password, phone, name, roles) |
roles | Role list (ADMIN, USER, etc.) |
user_roles | Join table for many-to-many |
tokens | JWT / refresh tokens issued |
otps | OTPs sent to phone/email (for verification) |
login_logs | Logs of login attempts |
social_logins | Mapping for OAuth logins (Google, etc.) |
📦 Project Deliverables
| Deliverable | Description |
|---|---|
| ✅ Full Spring Boot app | auth-service (gradle or maven) |
| ✅ REST APIs | /register, /login, /otp/send, /oauth2/google, etc. |
| ✅ Swagger UI | API docs for external clients |
| ✅ Docker Image | Easy to deploy anywhere |
| ✅ Postman Collection | For anyone to test APIs |
| ✅ README.md | Well-documented usage |
| ✅ GitHub CI/CD | Auto-build + Docker push |
| ✅ Dev Environment | Use GitHub Codespaces or Gitpod for easy launch |
| ✅ Cloud Deploy Ready | Railway, Fly.io, EC2 setup possible |
🛒 Future Monetization Strategy
| Phase | Strategy |
|---|---|
| MVP | Free REST-based Auth Service via GitHub |
| Phase 2 | Hosted Auth SaaS (e.g., like Firebase/Auth0) with billing |
| Phase 3 | SDKs for Android, iOS, Web |
| Phase 4 | Integration Marketplace (email, OTP, Google login, etc.) |
| Optional | Offer it as API product on RapidAPI or your own dev portal |