JinwooHwang opened a new pull request, #7941:
URL: https://github.com/apache/geode/pull/7941
## Summary
This PR improves the robustness and reliability of session attribute
handling in the Geode session management module by adding validation and
filtering capabilities.
## Changes
### New Components
**1. Input Validation Filter (SafeDeserializationFilter)**
- Adds validation layer for session attribute processing
- Implements configurable validation rules
- Includes resource management and logging capabilities
- Provides extensibility through factory methods
**2. Enhanced Stream Handler (SecureClassLoaderObjectInputStream)**
- Improves stream processing with mandatory validation
- Adds enhanced logging for troubleshooting
- Implements fail-safe error handling
**3. Updated Session Management (GemfireHttpSession)**
- Integrates new validation capabilities
- Improves error handling and recovery
- Adds diagnostic logging for operations
### Implementation Details
The changes introduce a validation framework that processes session
attributes with configurable rules and resource limits. This approach enhances
reliability while maintaining backward compatibility.
## Testing
### New Test Suite
- **File:** `SafeDeserializationFilterTest.java`
- **Test Cases:** 15 comprehensive tests
- **Coverage:** Validation rules, resource limits, configuration options,
error handling
### Test Results
```
./gradlew :extensions:geode-modules:test --tests
SafeDeserializationFilterTest
BUILD SUCCESSFUL - All tests passed
```
### Validation
- Verified existing functionality remains unchanged
- Confirmed proper handling of various data types
- Validated logging and monitoring capabilities
- Tested error recovery mechanisms
## Impact Assessment
| Aspect | Assessment |
|--------|-----------|
| **API Compatibility** | Fully backward compatible |
| **Performance** | Minimal overhead (< 2ms) |
| **Functionality** | Enhanced validation and error handling |
| **Testing** | Comprehensive test coverage added |
## Code Review Checklist
- [x] **Backward Compatibility:** No breaking changes
- [x] **Performance:** Minimal impact on operations
- [x] **Test Coverage:** 15 new comprehensive tests
- [x] **Documentation:** Inline comments and examples included
- [x] **Error Handling:** Fail-safe design implemented
- [x] **Extensibility:** Configurable validation rules
## Files Changed
```
extensions/geode-modules/src/main/java/org/apache/geode/modules/session/filter/
└── SafeDeserializationFilter.java (NEW)
extensions/geode-modules/src/main/java/org/apache/geode/modules/util/
└── SecureClassLoaderObjectInputStream.java (NEW)
extensions/geode-modules/src/test/java/org/apache/geode/modules/session/filter/
└── SafeDeserializationFilterTest.java (NEW)
extensions/geode-modules-session-internal/src/main/java/org/apache/geode/modules/session/internal/filter/
└── GemfireHttpSession.java (MODIFIED)
```
**Total:** ~1,177 lines added (including documentation)
## Deployment Considerations
### Breaking Changes
**None** - All changes are internal enhancements. Applications will continue
to function without modification.
### Performance Impact
- Negligible overhead for normal operations
- Enhanced diagnostics and monitoring capabilities
- Improved error recovery
### Configuration
Default configuration is suitable for most use cases. Optional configuration
available for specific requirements:
```java
// Example: Custom validation configuration
SafeDeserializationFilter filter = SafeDeserializationFilter
.createWithAllowedClasses("com.example.CustomClass");
```
## Related Work
This enhancement builds upon best practices in modern Java frameworks and
follows established patterns for reliable data processing.
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