lcbp3/specs/09-history/2025-12-06_p2-completion.md

2025-12-06 P2 Implementation Summary

Date: 2025-12-06 Status: ✅ P2 Complete Objective: Enhance Security and Documentation

Executive Summary

This session focused on completing Priority 2 (P2) tasks for the Backend v1.4.3. All P2 objectives were met, including API documentation, secure session management, observability, and API hardening.

Note: While P2 features are complete and verified by code review, the pnpm build process is currently failing due to pre-existing issues in P0 modules (Casl Ability & Workflow DSL) that were outside the scope of this session. These build errors must be addressed in the next session (P0 Urgent).

Completed Tasks

✅ P2-1: Swagger API Documentation

• Objective: Improve API discoverability.
• Changes:
  • Configured SwaggerModule at /docs.
  • Added full documentation for AuthController, CorrespondenceController, RfaController, and UserController.
  • Decorated DTOs with @ApiProperty for schema clarity.

✅ P2-2: Refresh Token Mechanism

• Objective: Secure session management implementation (ADR-016).
• Changes:
  • Created RefreshToken entity (hashed tokens).
  • Implemented AuthService logic for:
    • Token Generation: Access (15m) + Refresh (7d).
    • Storage: Hashed in DB.
    • Rotation: Refresh token reuse triggers rotation.
    • Revocation: Security mechanism to invalidate stolen token families.
  • Exposed POST /auth/refresh endpoint.

✅ P2-3: Prometheus Metrics

• Objective: System observability.
• Changes:
  • Integrated @willsoto/nestjs-prometheus and opened /metrics.
  • Implemented standard metrics (CPU, Memory).
  • Added custom HTTP metrics (http_requests_total, http_request_duration_seconds) via PerformanceInterceptor.
  • Refactored MonitoringModule for modularity.

✅ P2-4: Rate Limiting & Security Headers

• Objective: API Hardening.
• Changes:
  • Throttler: Verified global rate limit (100/min) and strict login limit (5/min).
  • Helmet: Configured Security Headers with custom CSP to support Swagger UI.
  • CORS: Dynamic configuration connected to ConfigService.

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Known Issues (P0 - Urgent)

The following build errors were identified but deferred as they belong to P0 scope:

1. AbilityFactory (CASL): TypeScript mismatch in Permission loops (CASL integration).
2. WorkflowEngine (DSL): TypeScript mismatch in Zod Schema validation (WorkflowParser).

Action Plan: These must be fixed immediately in the next session to restore build stability.

Artifacts Created

• specs/09-history/2025-12-06_p2-completion.md (This file)
• src/common/auth/entities/refresh-token.entity.ts
• src/modules/monitoring/ (Refactored)