docs(03-02): complete Domaincheck module plan summary

- DNS-based domain availability checking across TLD variants - Frontend page with input form and color-coded results - Module self-seeds into registry on startup
2026-06-19 13:29:48 +02:00
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+---
+phase: 03-module-system-domaincheck
+plan: 02
+subsystem: domaincheck
+tags: [dns, nestjs, next-intl, react, tailwind, module-system]
+dependency_graph:
+  requires:
+    - module-registry-service
+    - module-guard
+    - prisma-service
+    - tenant-middleware
+    - jwt-auth-guard
+  provides:
+    - domaincheck-service
+    - domaincheck-controller
+    - domaincheck-module
+    - domaincheck-frontend-page
+    - domaincheck-seed
+  affects: [module-marketplace, sidebar-module-links]
+tech_stack:
+  added: [node:dns/promises]
+  patterns: [module-seed-on-init, dns-availability-check, module-page-pattern]
+key_files:
+  created:
+    - apps/api/src/domaincheck/domaincheck.module.ts
+    - apps/api/src/domaincheck/domaincheck.service.ts
+    - apps/api/src/domaincheck/domaincheck.controller.ts
+    - apps/api/src/domaincheck/dto/check-domain.dto.ts
+    - apps/api/src/domaincheck/domaincheck.seed.ts
+    - apps/web/src/app/(portal)/modules/domaincheck/page.tsx
+    - apps/web/src/app/(portal)/modules/domaincheck/actions.ts
+    - apps/web/src/app/(portal)/modules/domaincheck/components/DomainInput.tsx
+    - apps/web/src/app/(portal)/modules/domaincheck/components/ResultList.tsx
+  modified:
+    - apps/api/src/app.module.ts
+    - apps/web/src/messages/de.json
+    - apps/web/src/messages/en.json
+key_decisions:
+  - "Used node:dns/promises with Promise.allSettled for parallel non-blocking lookups"
+  - "DNS timeout and error handling defaults to 'registered' as safe assumption"
+  - "Module self-seeds via OnModuleInit lifecycle hook for zero-config startup"
+  - "Frontend uses client-side fetch (not server action) for domain checks to keep interactive UX"
+patterns_established:
+  - "Module seed pattern: OnModuleInit calls seedModule() for self-registration in registry"
+  - "Module page pattern: (portal)/modules/{slug}/page.tsx with actions.ts for API calls"
+  - "Result badge pattern: green/red pills with dark mode variants for status display"
+requirements_completed: [DCHK-01, DCHK-02, DCHK-03]
+duration: 7min
+completed: 2026-06-19
+---
+
+# Phase 03 Plan 02: Domaincheck Module Summary
+
+**End-to-end domain availability checker using DNS resolution across TLD variants with color-coded results in the portal UI**
+
+## Performance
+
+- **Duration:** 7 min
+- **Started:** 2026-06-19T11:21:06Z
+- **Completed:** 2026-06-19T11:28:12Z
+- **Tasks:** 2
+- **Files modified:** 12
+
+## Accomplishments
+- DomaincheckService checks domain availability via node:dns/promises with 5s timeout per lookup and Promise.allSettled for parallel execution
+- POST /modules/domaincheck/check endpoint protected by UseModule guard, validates input with regex (T-03-05) and limits TLDs to 10 (T-03-06)
+- Frontend page at /modules/domaincheck with input form, loading state, and green/red status badges for results
+- Module self-seeds into registry on application startup via OnModuleInit, creating the domaincheck record automatically
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Domaincheck Backend - DNS Service + API Endpoint + Module Seed** - `2e0a4dd` (feat)
+2. **Task 2: Domaincheck Frontend - Input Form + Results Display** - `1d9fd22` (feat)
+
+## Files Created/Modified
+
+- `apps/api/src/domaincheck/dto/check-domain.dto.ts` - DTO with regex validation and TLD array limit
+- `apps/api/src/domaincheck/domaincheck.service.ts` - DNS-based domain availability checking service
+- `apps/api/src/domaincheck/domaincheck.controller.ts` - POST /modules/domaincheck/check endpoint
+- `apps/api/src/domaincheck/domaincheck.module.ts` - NestJS module with OnModuleInit seed
+- `apps/api/src/domaincheck/domaincheck.seed.ts` - Seed function for module registry
+- `apps/api/src/app.module.ts` - Added DomaincheckModule import
+- `apps/web/src/app/(portal)/modules/domaincheck/page.tsx` - Module page with input and results
+- `apps/web/src/app/(portal)/modules/domaincheck/actions.ts` - Client-side API call function
+- `apps/web/src/app/(portal)/modules/domaincheck/components/DomainInput.tsx` - Domain input form component
+- `apps/web/src/app/(portal)/modules/domaincheck/components/ResultList.tsx` - Color-coded results list
+- `apps/web/src/messages/de.json` - Added domaincheck i18n keys (German)
+- `apps/web/src/messages/en.json` - Added domaincheck i18n keys (English)
+
+## Decisions Made
+
+- Used `node:dns/promises` with `dns.resolve()` for availability detection -- standard Node.js API, no external dependency needed
+- Safe default: DNS errors other than ENOTFOUND/ENODATA return "registered" to avoid false availability claims
+- Module seeds itself via OnModuleInit lifecycle hook rather than a separate migration or seed script -- zero-config startup
+- Frontend uses client-side fetch with `credentials: 'include'` (consistent with existing portal pages) rather than server actions for domain checks to maintain interactive UX
+
+## Threat Mitigations Applied
+
+| Threat ID | Mitigation | Implementation |
+|-----------|------------|----------------|
+| T-03-05 | Regex validation on domain input | check-domain.dto.ts: alphanumeric + hyphens, max 63 chars, no dots |
+| T-03-06 | 5s timeout per lookup, max 10 TLDs | domaincheck.service.ts + check-domain.dto.ts ArrayMaxSize(10) |
+| T-03-07 | Accepted - domain availability is public | No additional mitigation needed |
+| T-03-08 | UseModule('domaincheck') guard | domaincheck.controller.ts: class-level decorator with JwtAuthGuard |
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Domaincheck module is fully functional end-to-end
+- Module page pattern established for future modules under (portal)/modules/{slug}/
+- Module seed pattern established for self-registration on startup
+- Sidebar integration for module navigation may be needed in a future plan
+
+## Self-Check: PASSED
+
+All 9 created files verified on disk. Both task commits (2e0a4dd, 1d9fd22) verified in git log.
+
+---
+*Phase: 03-module-system-domaincheck*
+*Completed: 2026-06-19*