feat: add namespace blocking functionality for JWT authentication - #313

✅ Strengths

Security Design:

• Proper admin bypass logic using global permissions (* pattern)
• Blocking check happens before token generation, preventing unauthorized access
• Clear error messages guide users to raise issues if blocked incorrectly

Implementation Quality:

• Clean separation of concerns with blocks.go containing the denylist
• Comprehensive test coverage (100% of blocking scenarios)
• Good use of existing HasPermission method for consistency

Code Quality:

• Well-documented functions and clear variable names
• Proper error handling and meaningful error messages
• Test setup includes proper cleanup with defer statements

🔍 Minor Considerations

File Organization (internal/auth/blocks.go:5)

• Your rationale for using a file vs database makes sense for this use case
• Consider adding a comment about the audit trail benefit for future maintainers

Edge Case Handling (internal/auth/jwt.go:87)

• The blocking logic appends /test to check permissions: blockedNamespace+"/test"
• This works correctly but might be unclear to future readers
• Consider extracting to a constant or adding a comment explaining why /test is used

Test Isolation (internal/auth/jwt_test.go:301-303)

• Tests modify global BlockedNamespaces variable with proper cleanup
• This pattern works but could be fragile if tests run in parallel
• Consider dependency injection for the blocked namespaces list in future refactoring

🎯 Specific Code References

• Global admin bypass: internal/auth/jwt.go:75-82 correctly identifies * permissions
• Blocking validation: internal/auth/jwt.go:84-91 properly skips blocking for admins
• Error handling: internal/auth/jwt.go:88 provides helpful error message with issue reporting URL
• Test coverage: internal/auth/jwt_test.go:287-400 covers all critical scenarios