Spring Boot 3.5.3 + React 19 | Production-Ready Authentication System
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What's happening behind the scenes? Our Spring Boot backend serves this sleek interface while managing complex authentication flows, JWT token generation, and secure session handling.
graph TB
A[Client Request] --> B{Authentication Type}
B -->|Local Auth| C[Email/Password]
B -->|OAuth2| D[Google/GitHub]
B -->|OTP| E[Email OTP]
C --> F[AuthController]
D --> G[OAuthController]
E --> H[OtpAuthController]
F --> I[AuthService]
G --> J[GoogleOAuthService/GithubOAuthService]
H --> K[OtpService]
I --> L[JWT Generation]
J --> L
K --> L
L --> M[Access Token + Refresh Token]
M --> N[HttpOnly Cookie + Bearer Token]
N --> O[JWTFilter Validation]
O --> P[SecurityContext]
P --> Q[Protected Resources]
style A fill:#e1f5fe
style L fill:#c8e6c9
style Q fill:#fff3e0
Backend Magic:
- BCrypt Password Hashing (Strength: 12) for maximum security
- JWT Access + Refresh Token dual-layer system
- HttpOnly Secure Cookies for refresh token storage
- Real-time validation with Spring Security filters
Backend Powerhouse Features:
- Google OAuth2 complete flow implementation
- GitHub OAuth2 with email verification
- Automatic user provisioning for new social accounts
- Token exchange and secure user info retrieval
- RestTemplate integration for external API calls
Advanced Backend Implementation:
- Random OTP generation with secure algorithms
- Gmail SMTP integration for email delivery
- Time-based expiration handling
- Redis caching for OTP storage and validation
Backend Email Service Features:
- Gmail SMTP configuration with app passwords
- HTML email templates for professional communication
- Delivery confirmation and error handling
- Rate limiting to prevent spam
Smart Backend Logic:
- Cooldown periods to prevent abuse
- Automatic cleanup of expired OTPs
- Retry mechanisms with exponential backoff
Backend Security Implementation:
- Spring Security role-based endpoint protection
- JWT Claims with role information
- Method-level security annotations
- Hierarchical permission system
Protected Endpoints:
/api/is-admin/**- Admin-only resources/api/is-user/**- User-level access- Dynamic role checking in JWT filter
Backend Security Measures:
- Current password verification before changes
- BCrypt re-hashing with salt rotation
- Session invalidation after password change
- Audit logging for security events
🔧 Core Technologies:
├── Java 21 (Latest LTS)
├── Spring Security 6
├── PostgreSQL + JPA
├── Redis Caching
├── JWT (jjwt 0.12.6)
└── Maven Build System
- User registration with duplicate validation
- Secure login with BCrypt verification
- JWT token generation and refresh rotation
- HttpOnly cookie management for security
- Access token generation (15-minute expiry)
- Refresh token handling (7-day rotation)
- Claims parsing and validation
- Signature verification with HMAC-SHA256
- GoogleOAuthService: Complete OAuth2 flow
- GithubOAuthService: GitHub authentication
- Token exchange with external providers
- User profile synchronization
- Cryptographically secure OTP generation
- SMTP email delivery with templates
- Time-based expiration management
- Anti-spam protection mechanisms
- User Entity with audit trails
- Role-based permission system
- Provider tracking (LOCAL, GOOGLE, GITHUB)
- Automatic timestamps with JPA auditing
- Session management for scalability
- OTP storage with TTL expiration
- Rate limiting data structures
- Performance optimization for frequent queries
- Custom JWT filter intercepts all requests
- Bearer token extraction and validation
- Security context population
- CORS configuration for cross-origin requests
- Spring Security authentication provider
- BCrypt password encoder (strength 12)
- UserDetailsService integration
- Session management (stateless)
- Role-based method security
- Endpoint-level access control
- Dynamic permission checking
- Audit trail logging
| Method | Endpoint | Purpose | Security |
|---|---|---|---|
POST |
/api/auth/register |
User Registration | Public |
POST |
/api/auth/login |
Email/Password Login | Public |
POST |
/api/auth/refresh |
Token Refresh | Cookie Auth |
POST |
/api/auth/logout |
Secure Logout | Cookie Auth |
POST |
/api/auth/google/callback |
Google OAuth2 | Public |
POST |
/api/auth/github/callback |
GitHub OAuth2 | Public |
POST |
/api/auth/request-otp |
OTP Generation | Public |
POST |
/api/auth/verify-otp |
OTP Verification | Public |
| Endpoint Pattern | Required Role | Description |
|---|---|---|
/api/is-user/** |
USER | User-level resources |
/api/is-admin/** |
ADMIN | Admin-only resources |
/api/health/** |
Public | Health checks |
- JWT Secret Management with environment variables
- Database Connection Pooling for performance
- CORS Configuration for frontend integration
- Email SMTP Settings with Gmail integration
- OAuth2 Client Credentials management
# Backend Power-Up
cd AB-Backend
mvn clean install
mvn spring-boot:run
# Frontend Launch
cd AB-Frontend
npm install
npm run dev- Connection Pooling with HikariCP
- Redis Caching for session data
- JWT Stateless authentication
- Lazy Loading with JPA
- Async Processing for email delivery
- Horizontal scaling ready architecture
- Database indexing on critical fields
- Caching strategies for frequent queries
- Load balancer compatible design
- Unit Tests for service layer
- Integration Tests for controllers
- Security Tests for authentication flows
- Performance Tests for load handling
- Spring Boot DevTools for hot reload
- Lombok for boilerplate reduction
- Maven for dependency management
- PostgreSQL for development database
- Environment-specific JWT secrets
- HTTPS enforcement
- Rate limiting implementation
- SQL injection prevention
- XSS protection headers
- Application performance monitoring
- Security audit logging
- Error tracking and alerting
- Health check endpoints
- Enterprise-Grade Security with multiple authentication methods
- Scalable Architecture built with Spring Boot best practices
- Production-Ready with comprehensive error handling
- Developer-Friendly with clean, well-documented code
- Modern Stack using latest Java 21 and Spring Boot 3.5.3
- Multi-Authentication Support (Local, OAuth2, OTP)
- Robust JWT Implementation with refresh token rotation
- Real Email Integration with Gmail SMTP
- Role-Based Security with fine-grained permissions
- Caching Strategy with Redis for performance
🔥 Built by a passionate developer who believes in secure, scalable, and beautiful code
Powered by Spring Boot 3.5.3 + React 19 - The perfect full-stack combination
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