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Input Validation

Security Requirement Statement​

All user inputs must be validated and sanitized before processing.

Control Classification​

  • Timing Control Category: Preventive
  • Nature Control Category: Technical
  • Status: Implemented
  • Date Identified: 2025-10-29
  • Date First Implemented: 2025-10-29
  • Date Last Reviewed: 2025-10-29
  • Date Retired: N/A

Value Object Pattern Implementation

  • Email class validates email format using HTML5 specification regex pattern
  • Username enforces character restrictions, length limits (3-50 chars), and alphanumeric validation
  • FirstName and LastName validate non-empty strings with 100 character limits
  • Address, City, State, Country validate location data with appropriate length constraints
  • ZipCode validates US postal code format with regex: /^\d{5}(-\d{4})?$/

Domain Entity Validation

  • All entity setters use value objects for input validation before assignment
  • PersonalUser profile setters validate inputs: this.props.email = new ValueObjects.Email(email).valueOf()
  • Domain validation occurs at aggregate root level before persistence
  • Value objects enforce immutability and validation consistency

Pattern-Based Validation

  • EMAIL_PATTERN uses HTML5 specification for email validation
  • GUID_PATTERN validates external identifiers: /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
  • Username validation regex: /^[a-zA-Z0-9._-]+$/ prevents injection attempts
  • Input trimming automatically removes leading/trailing whitespace

Compensating Controls​

Comprehensive Test Coverage

  • Value objects include Cucumber feature tests for all validation scenarios
  • Unit tests verify pattern matching, length validation, and error conditions
  • Edge case testing for null, undefined, empty strings, and boundary conditions

Domain Layer Enforcement

  • Value objects integrated into entity setters prevent invalid data entry
  • Validation occurs at construction time, preventing invalid instances
  • Error messages provide clear feedback: "Too long", "Value doesn't match pattern", "Invalid TypeName"

Type Safety Integration

  • TypeScript strict typing enforces compile-time validation
  • Value objects extend @lucaspaganini/value-objects library for robust validation
  • Domain entities use value objects exclusively for all user input processing

Success Criteria​

Input Validation Coverage

  • All user inputs validated through domain value objects
  • Email validation prevents malformed addresses and injection attempts
  • Username validation enforces safe character sets and length limits
  • Address components validated for appropriate length and format

Domain Validation Enforcement

  • Value objects prevent invalid data construction
  • Entity setters enforce validation before property assignment
  • Clear error messages guide users to correct input format
  • Validation consistently applied across all domain entities

Security Pattern Implementation

  • Regex patterns prevent common injection attack vectors
  • Input sanitization through trimming and format validation
  • Type system prevents bypassing validation through compilation
  • Comprehensive test coverage validates security boundaries