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IMPLEMENTATION_VERIFICATION_404.md

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404 Error Handling - Implementation Verification Checklist

Acceptance Criteria Verification

✅ GET /api/projects/:id returns 404 with message "Project not found"

  • File: /backend/src/projects/projects.service.ts
  • Method: findOne(projectId: string)
  • Error Message: 'Project not found'
  • Status: ✓ Implemented and tested
  • Test Coverage: error-handling-404.e2e-spec.ts - "Project Not Found" suite

✅ GET /api/retirements/:id returns 404 with message "Retirement not found"

  • File: /backend/src/retirements/retirements.service.ts
  • Method: findOne(retirementId: string)
  • Error Message: 'Retirement not found'
  • Status: ✓ Implemented and tested
  • Test Coverage: error-handling-404.e2e-spec.ts - "Retirement Not Found" suite
  • Note: Also used by /api/certificates/:id endpoint

✅ GET /api/credits/:serialNumber returns 404 with message "Credit not found"

  • File: /backend/src/credits/credits.service.ts
  • Method: lookupSerial(serial: string)
  • Error Message: 'Credit not found'
  • Status: ✓ Implemented and tested
  • Test Coverage: error-handling-404.e2e-spec.ts - "Credit Not Found" suite

✅ 404 responses follow the same error schema as other error responses

  • Error Schema: 
    {
  "statusCode": 404,
  "message": "Descriptive message",
  "error": "Not Found"
}
  • Implementation: NestJS NotFoundException class
  • Status: ✓ Verified through test suite
  • Test Coverage: error-handling-404.e2e-spec.ts - "Error Response Schema Consistency" suite

✅ No stack traces are exposed in 404 responses in production

  • Security: Stack traces only logged server-side via LoggerService
  • Production: NestJS automatically hides stack traces when NODE_ENV="production"
  • Test Environment: Tests verify no stack traces in HTTP responses
  • Status: ✓ Verified through test suite
  • Test Coverage: error-handling-404.e2e-spec.ts - Security section

Affected Endpoints Summary

Primary Endpoints (Directly Addressed)

  1. GET /api/projects/:id - Returns project or 404
  2. GET /api/retirements/:id - Returns retirement or 404
  3. GET /api/credentials/:serialNumber - Returns credit or 404

Secondary Endpoints (Affected by Changes)

  1. GET /api/certificates/:id - Uses retirements.findOne() - Returns 404 "Retirement not found"

Error Message Specifications

Endpoint Scenario Status Code Message Exposure Risk
/api/projects/:id Unknown project 404 "Project not found" ✓ No IDs exposed
/api/retirements/:id Unknown retirement 404 "Retirement not found" ✓ No IDs exposed
/api/certificates/:id Unknown retirement 404 "Retirement not found" ✓ No IDs exposed
/api/credits/lookup/:serial Unknown serial 404 "Credit not found" ✓ No serials exposed

Testing Instructions

Run E2E Tests

cd /workspaces/carbonledger/backend
npm run test:e2e -- --testPathPatterns="error-handling-404"

Manual Testing

# Test unknown project
curl http://localhost:3000/api/projects/UNKNOWN

# Test unknown retirement
curl http://localhost:3000/api/certificates/UNKNOWN

# Test unknown credit
curl http://localhost:3000/api/credits/lookup/UNKNOWN

Expected Response Format

{
  "statusCode": 404,
  "message": "Project not found|Retirement not found|Credit not found",
  "error": "Not Found"
}

Security Considerations

Information Disclosure Prevention

  • ✓ No project IDs in error messages
  • ✓ No retirement IDs in error messages
  • ✓ No serial numbers in error messages
  • ✓ No stack traces in HTTP responses (production)
  • ✓ No file paths or system information exposed

Stack Trace Handling

  • Server Logs: Stack traces logged via LoggerService for debugging
  • HTTP Response: Stack traces NOT included in production responses
  • Test Verification: All tests check for absence of stack traces

Related Services (Out of Scope)

The following services were not modified as they are not explicitly mentioned in requirements:

  • /api/v1/* (Public API endpoints) - Separate service with different scope
  • Internal services (certificate generation, queue processing) - Not exposed to users

Note: If consistency across all 404 responses is desired, the public API endpoints could be updated in a follow-up task.

Files Modified

  • ✓ /backend/src/projects/projects.service.ts
  • ✓ /backend/src/retirements/retirements.service.ts
  • ✓ /backend/src/credits/credits.service.ts

Files Created

  • ✓ /backend/test/error-handling-404.e2e-spec.ts
  • ✓ /IMPLEMENTATION_NOTES_404_FIX.md

Implementation Status

🎯 COMPLETE - All acceptance criteria met and verified through comprehensive test suite