Backend Refactoring
1. Enhanced User Session Management & Logging
CurrentSessionProvider (backend/server/src/main/java/dev/rheinsw/server/security/session/CurrentSessionProvider.java):
- Added comprehensive null safety checks for JWT authentication
- Implemented detailed logging for user session retrieval
- Added validation for all required JWT claims (sub, preferred_username, email)
- Enhanced error messages with specific validation failures
UserSessionFilter (backend/server/src/main/java/dev/rheinsw/server/security/session/UserSessionFilter.java):
- Replaced silent exception handling with proper logging
- Added request context logging (method, URI)
- Categorized different exception types for better debugging
- Enhanced error visibility while maintaining non-blocking behavior
UserService (backend/server/src/main/java/dev/rheinsw/server/security/user/UserService.java):
- Added comprehensive null safety validations
- Implemented detailed logging for user creation and lookup operations
- Enhanced exception handling with proper error context
- Added input validation for session data
2. Improved Controller Logging & Validation
CustomerController (backend/server/src/main/java/dev/rheinsw/server/internal/customer/controller/CustomerController.java):
- Added comprehensive logging for all user actions
- Implemented input validation with @Valid annotations
- Enhanced error handling with user context
- Added null checks for path parameters
ProjectController (backend/server/src/main/java/dev/rheinsw/server/internal/project/controller/ProjectController.java):
- Similar logging and validation improvements
- Added comprehensive user action tracking
- Enhanced error handling with proper validation
3. Enhanced DTO Validation
CreateCustomerDto (backend/server/src/main/java/dev/rheinsw/server/internal/customer/dtos/CreateCustomerDto.java):
- Added Bean Validation annotations (@NotBlank, @Email, @Size)
- Implemented comprehensive field validation
- Added proper error messages in German
CustomerValidationRequest & CreateCustomerProjectDto: Similar validation enhancements
4. Improved Exception Handling
GlobalExceptionHandler (backend/common/src/main/java/dev/rheinsw/common/controller/exception/handler/GlobalExceptionHandler.java):
- Added correlation IDs for better error tracking
- Replaced unsafe error message exposure with secure error responses
- Enhanced logging with proper log levels and context
- Added specific handlers for validation errors and illegal arguments
- Implemented structured error responses with correlation tracking
ProjectUseCaseImpl (backend/server/src/main/java/dev/rheinsw/server/internal/project/usecase/ProjectUseCaseImpl.java):
- Fixed null return issue (now throws exceptions instead)
- Added comprehensive input validation
- Enhanced error handling with proper exception types
- Added detailed logging for all operations
5. Test Coverage & Quality
Added comprehensive unit tests:
- CurrentSessionProviderTest: 8 test cases covering all authentication scenarios
- UserServiceTest: 7 test cases covering user creation and validation
- ProjectUseCaseImplTest: 14 test cases covering project operations
- Added test dependencies (spring-boot-starter-test, spring-security-test)
6. Frontend Compatibility
Updated frontend error handling:
- Enhanced validateCustomer.ts and addCustomer.ts to log correlation IDs
- Maintained backward compatibility with existing error handling
- Added debugging support for new correlation ID feature
7. Build & Deployment
- ✅ Backend: Builds successfully with all tests passing
- ✅ Frontend: Both frontend projects build successfully
- ✅ Dependencies: Added necessary test dependencies
- ✅ Validation: Bean Validation is properly configured and working
🔒 Security & Reliability Improvements
1. Authentication Security: Robust JWT validation with proper error handling
2. Input Validation: Comprehensive validation across all DTOs
3. Error Handling: Secure error responses that don't expose internal details
4. Null Safety: Extensive null checks throughout the codebase
5. Logging Security: No sensitive data logged, proper correlation IDs for debugging
📈 Monitoring & Debugging
1. Correlation IDs: Every error response includes a unique correlation ID
2. Structured Logging: Consistent logging patterns with user context
3. Request Tracing: User actions are logged with proper context
4. Error Classification: Different error types handled appropriately
Thatsaphorn Atchariyaphap
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