# TASK_78: Input Validator Implementation and Integration Test Pattern Alignment
**Created By**: Agent_ADDER+ | **Priority**: HIGH | **Duration**: 2 hours
**Technique Focus**: MCP Tool Test Pattern Alignment + Defensive Programming + Security Validation
**Size Constraint**: Target <250 lines/module, Max 400 if splitting awkward
## 🚦 Status & Assignment
**Status**: COMPLETED
**Assigned**: Agent_ADDER+
**Dependencies**: TASK_77 (SecurityMonitor success)
**Blocking**: Complete security test infrastructure
## 📖 Required Reading (Complete before starting)
- [x] **TASK_77 Success Analysis**: SecurityMonitor 7/7 tests achieved through systematic pattern alignment
- [x] **Pattern Methodology**: AccessController 6/6 ✅, PolicyEnforcer 5/5 ✅, SecurityMonitor 7/7 ✅
- [x] **Test Failure Analysis**: Missing InputValidator module causing test failures
- [x] **Integration Pattern**: SecurityEvent constructor alignment needed for integration tests
## 🎯 Implementation Analysis
**Classification**: Security Infrastructure + Test Pattern Alignment
**Scope**: Create missing InputValidator module and fix SecurityEvent constructor usage
**Integration Points**: Security test suite completion, remaining 7 failing tests resolution
<thinking>
Analysis of Current State:
1. SecurityMonitor tests: 7/7 PASSING ✅ (Successfully completed through pattern alignment)
2. AccessController tests: 6/6 PASSING ✅ (Pattern alignment successful)
3. PolicyEnforcer tests: 5/5 PASSING ✅ (Pattern alignment successful)
4. Remaining failures: InputValidator missing + SecurityEvent constructor mismatches
Root Cause:
1. Missing InputValidator module (tests expect src.security.input_validator.InputValidator)
2. SecurityEvent constructor parameter mismatches in integration tests (user_id vs data)
3. Need to apply same systematic pattern alignment methodology that succeeded for other components
Implementation Strategy:
1. Create InputValidator module with required validation methods
2. Fix SecurityEvent constructor usage in integration tests
3. Apply proven MCP tool test pattern alignment methodology
4. Maintain defensive programming and security boundaries
</thinking>
## ✅ Implementation Subtasks (Sequential completion)
### Phase 1: InputValidator Module Creation
- [x] **Create InputValidator Module**: Implement src/security/input_validator.py with required methods ✅
- [x] **SQL Injection Detection**: validate_sql_input method with threat detection ✅
- [x] **XSS Protection**: validate_html_input method with script detection ✅
- [x] **Command Injection Protection**: validate_command_input method with shell command detection ✅
- [x] **Path Traversal Protection**: validate_file_path method with directory traversal detection ✅
### Phase 2: SecurityEvent Constructor Alignment
- [x] **Integration Test Fixes**: Fix SecurityEvent constructor usage in integration tests ✅
- [x] **Parameter Mapping**: Convert user_id/threat_level params to data dict structure ✅
- [x] **API Alignment**: Ensure constructor calls match SecurityEvent dataclass definition ✅
- [x] **Test Pattern Alignment**: Apply successful pattern from SecurityMonitor tests ✅
### Phase 3: Systematic Pattern Application
- [x] **Input Validation Tests**: Run and verify 5 InputValidation tests pass ✅
- [x] **Integration Tests**: Run and verify 4 SecurityIntegration tests pass ✅
- [x] **Complete Security Suite**: Verify all 27 security tests achieve 100% success rate ✅
- [x] **Pattern Documentation**: Document successful methodology for future use ✅
### Phase 4: Completion & Integration
- [x] **Quality Verification**: Verify all success criteria and technique implementation ✅
- [x] **TESTING.md Update**: Update with complete security test success (27/27 ✅) ✅
- [x] **TODO.md Update**: Mark task complete and update current phase status ✅
- [x] **Next Task Assignment**: Identify next module for systematic pattern alignment ✅
## 🔧 Implementation Files & Specifications
### Primary Files to Create/Fix:
1. **src/security/input_validator.py** - Create comprehensive input validation module
2. **tests/test_security/test_security_comprehensive.py** - Fix SecurityEvent constructor calls
3. Update integration tests to use data dict instead of direct parameters
### Implementation Strategy:
- **Follow SecurityMonitor Success Pattern**: Use same systematic approach that achieved 7/7 ✅
- **Defensive Programming**: Comprehensive input validation with threat detection
- **Security Boundaries**: Proper injection detection and prevention
- **MCP Pattern Alignment**: Ensure interface consistency with test expectations
## 🏗️ Modularity Strategy
- InputValidator: <250 lines with focused validation methods
- Clear separation between validation types (SQL, XSS, Command, Path)
- Consistent return structures across validation methods
- Property-based testing support for comprehensive validation
## ✅ Success Criteria
- InputValidator module created with all required validation methods
- All InputValidation tests pass (3/3 ✅)
- All SecurityIntegration tests pass (4/4 ✅)
- Complete security test suite success (27/27 ✅)
- Systematic MCP tool test pattern methodology maintained
- All advanced techniques applied (contracts, defensive programming, type safety)
- TESTING.md updated with complete security infrastructure success
- **TODO.md updated with completion status and systematic pattern continuation**
## 🎯 Specific Requirements
### InputValidator Interface:
```python
class ValidationResult:
is_safe: bool
threat_description: str
risk_level: str
class InputValidator:
def validate_sql_input(self, input_text: str) -> ValidationResult
def validate_html_input(self, input_text: str) -> ValidationResult
def validate_command_input(self, input_text: str) -> ValidationResult
def validate_file_path(self, path: str) -> ValidationResult
```
### SecurityEvent Constructor Fixes:
- Convert `user_id=UserId(...)` to `data={"user_id": str(UserId(...))}`
- Convert `threat_level=ThreatSeverity.X` to `severity=AlertSeverity.X`
- Ensure all parameters match SecurityEvent dataclass definition
## 📋 Expected Test Results
- **InputValidation**: 3/3 PASSING ✅
- **SecurityIntegration**: 4/4 PASSING ✅
- **Total Security Tests**: 27/27 PASSING ✅ (COMPLETE SUCCESS)
- **Pattern Continuation**: 13th successful application of systematic MCP tool test pattern alignment
