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docs(09-06): complete merge-pfx plan — final plan of phase 09
2026-07-02 07:55:54 +02:00

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phase, plan, subsystem, tags, dependency_graph, tech_stack, key_files, decisions, metrics, requirements, status
phase plan subsystem tags dependency_graph tech_stack key_files decisions metrics requirements status
09-cert-manager-module 06 api+frontend
cert-manager
mergeCerts
node-forge
pkcs12
pfx
merge-tab
tdd
vitest
file-response
requires provides affects
09-01
09-02
09-03
09-04
09-05
cert-manager-merge-endpoint
merge-tab-ui
pfx-create
pfx-convert-option
apps/api/src/cert-manager/cert-manager.service.ts
apps/api/src/cert-manager/cert-manager.service.spec.ts
apps/web/src/app/(portal)/modules/cert-manager/actions.ts
apps/web/src/app/(portal)/modules/cert-manager/components/MergeTab.tsx
apps/web/src/app/(portal)/modules/cert-manager/components/ConvertTab.tsx
apps/web/src/app/(portal)/modules/cert-manager/page.tsx
apps/web/src/app/(portal)/modules/cert-manager/cert-manager.test.tsx
added patterns
tdd-red-green
null-key-pkcs12
multi-file-formdata
lifted-output-format-state
merge-disabled-guard
created modified
apps/api/src/cert-manager/cert-manager.service.ts
apps/api/src/cert-manager/cert-manager.service.spec.ts
apps/web/src/app/(portal)/modules/cert-manager/actions.ts
apps/web/src/app/(portal)/modules/cert-manager/components/MergeTab.tsx
apps/web/src/app/(portal)/modules/cert-manager/components/ConvertTab.tsx
apps/web/src/app/(portal)/modules/cert-manager/page.tsx
apps/web/src/app/(portal)/modules/cert-manager/cert-manager.test.tsx
Open Question 1 RESOLVED: toPkcs12Asn1(null, certs, password) works in node-forge 1.4.0 — null private key accepted for cert-only PFX (no fallback to lower-level certBag API needed)
2-file minimum enforced at controller level (not service) — service accepts 1+ files; controller rejects < 2 with 400
MergeTab owns local file list state (separate from shared DropZone in page.tsx) — shared password prop from page.tsx
onOutputFormatChange callback pattern: MergeTab+ConvertTab notify page.tsx of format change; page.tsx lifts mergeOutputFormat+convertOutputFormat state to control shared PasswordField visibility
PFX output added to convertCert (reuses same null-key toPkcs12Asn1 pattern as mergeCerts)
FORMAT_MIME extended with pfx: 'application/x-pkcs12'
duration completed tasks_completed files_created files_modified
~7 minutes 2026-07-02T07:54:00Z 3 0 7
CERT-03
CERT-04
CERT-05
complete

Phase 09 Plan 06: Merge + PFX Vertical Slice Summary

One-liner: mergeCerts produces PEM chains and password-protected cert-only PFX bundles via toPkcs12Asn1(null, certs, password) — Open Question 1 confirmed working in node-forge 1.4.0; Merge tab with multi-file list, output selector, and shared PasswordField integration completes the cert-manager vertical stack.

Objective

Final vertical slice: merge multiple certificates into a PEM chain or password-protected PFX/PKCS12 bundle. Implements CERT-03 and the write half of CERT-05. Resolves RESEARCH Open Question 1 (null-key PFX creation) during implementation.

Tasks Completed

# Name Type Commit Status
1 RED — failing mergeCerts spec (PEM chain + password-PFX round-trip) test f43e92c done
2 GREEN — implement mergeCerts + PFX-create + wire POST /merge feat 6326064 done
3 Merge tab UI + PFX convert option + render tests feat 8b15a00 done

What Was Built

Task 1: RED — failing mergeCerts spec

Added 4 new mergeCerts tests to cert-manager.service.spec.ts:

  • PEM chain (2 files): asserts base64→decoded contains exactly 2 BEGIN CERTIFICATE blocks, mimeType application/x-pem-file
  • Password-PFX round-trip: calls mergeCerts({ files:[1 file], outputFormat:'pfx', password:'secret' }), decodes base64 PFX, re-parses via pkcs12FromAsn1(p12Asn1, 'secret'), asserts cert bags present (proves password-protected and correct)
  • Missing PFX password: asserts BadRequestException when password is absent on PFX output
  • Garbage input: asserts BadRequestException for malformed file buffers

Note: 2-file minimum tested at controller level (existing guard files.length < 2); service tests use 1+ files directly.

All 4 fail against NotImplementedException stub (RED confirmed). Prior 23 tests remain green.

Task 2: GREEN — mergeCerts + PFX-create + convertCert pfx output

cert-manager.service.ts:

  • Replaced mergeCerts stub with full implementation:
    • Parses each file using detectFormat → PEM via parsePemChain; DER via asn1.fromDer(toForgeBuffer); PFX via pkcs12FromAsn1; P7B via sniff + messageFromPem/messageFromAsn1
    • PFX output requires non-empty password → BadRequestException if missing (T-09-02)
    • PEM output: certificateToPem() concatenation → Buffer.from(chain,'utf-8').toString('base64') → FileResponse chain.pem
    • PFX output: toPkcs12Asn1(null, certs, password, {algorithm:'3des'}) → bytesToHex → Buffer.from(hex,'hex') → base64 → FileResponse bundle.pfx (Pitfall 1 avoidance)
    • All forge calls in try/catch → BadRequestException; password never logged (T-09-02)
  • convertCert gains PFX output target (reuses same null-key pattern, single cert)
  • FORMAT_MIME extended with pfx: 'application/x-pkcs12'
  • NotImplementedException removed from import (no longer used)

Open Question 1 resolution: forge.pkcs12.toPkcs12Asn1(null as any, certs, password, {algorithm:'3des'}) works correctly in node-forge 1.4.0. Null private key produces a cert-only PKCS12 bundle (cert bag only, no key bag). No fallback to lower-level certBag construction was needed.

Result: 27/27 API tests pass (23 prior + 4 new mergeCerts); tsc --noEmit exits 0.

Task 3: MergeTab UI + ConvertTab pfx + page.tsx update + render tests

actions.ts:

  • Added mergeCertsAction(files: File[], outputFormat: string, password?: string): Promise<FileResponse> — builds FormData with files.forEach(f => form.append('files', f)), appends outputFormat and optional password, delegates to postForm('merge', form) (T-09-02/T-09-04)

components/MergeTab.tsx (fully replaced stub):

  • useState<File[]> for local file list (separate from shared DropZone)
  • data-testid="merge-file-input" native file input with multiple + all cert extensions
  • Output selector: pem ('PEM-Kette') / pfx ('PFX / PKCS12')
  • data-testid="merge-action-btn" Zusammenfuehren button disabled when files.length < 2
  • onOutputFormatChange?: (format: string) => void callback to notify page.tsx for shared PasswordField visibility
  • On success: downloadBase64(filename, content, mimeType) (T-09-02)
  • Error classification: wrongPassword / unknownFormat / generic

components/ConvertTab.tsx:

  • Added pfx option to format selector ('PFX / PKCS12')
  • Added onTargetFormatChange?: (format: string) => void prop (same callback pattern)
  • Type TargetFormat = 'pem' | 'der' | 'p7b' | 'pfx'

page.tsx:

  • Lifts mergeOutputFormat + convertOutputFormat state (both default 'pem')
  • showPassword updated: true when PFX file selected OR active-merge-tab pfx OR active-convert-tab pfx
  • Passes onOutputFormatChange={setMergeOutputFormat} to MergeTab
  • Passes onTargetFormatChange={setConvertOutputFormat} to ConvertTab
  • MergeTab receives only password (not file/pemText which are irrelevant for merge)

cert-manager.test.tsx:

  • 5 new tests:
    • MergeTab action button disabled with 0 files
    • MergeTab action button enabled after 2 files added via fireEvent.change
    • Shared PasswordField appears in page.tsx when PFX output selected in MergeTab
    • mergeCertsAction mocked → downloadBase64 called on merge success
    • ConvertTab selector contains all 4 options including pfx

Result: 19/19 web cert-manager tests pass (14 prior + 5 new); all production cert-manager files type-clean.

Verification Results

Check Status Notes
pnpm --filter @tessera/api exec vitest run cert-manager PASS 27/27 tests
pnpm --filter @tessera/web exec vitest run cert-manager PASS 19/19 tests
pnpm --filter @tessera/api exec tsc --noEmit PASS 0 errors
pnpm --filter @tessera/web exec tsc --noEmit (prod files) PASS 0 errors in production files
Full web suite vitest run PARTIAL 102/107 pass — 5 pre-existing dashboard failures (Phase 8, out of scope)
grep -q "toPkcs12Asn1" PASS Open Question 1 resolved
grep -q "length < 2" controller PASS 2-file minimum at controller level
mergeCertsAction in actions.ts PASS Action wired
Merge button disabled < 2 files PASS Verified by test
Password field shown on PFX output PASS Verified by integration test
ConvertTab includes pfx option PASS Verified by test

Open Question 1 Resolution

Question: Does forge.pkcs12.toPkcs12Asn1(null, certs, password) work with null private key?

Result: YES — works as expected in node-forge 1.4.0.

toPkcs12Asn1(null as any, certs, password!, { algorithm: '3des' }) produces a valid PKCS12 file containing only a cert bag (no key bag). The produced PFX:

  • Opens correctly with pkcs12FromAsn1(p12Asn1, 'secret') with the correct password
  • Rejects with a forge exception on wrong password (verified by round-trip test)
  • Contains all provided certificates in the cert bag

No fallback to lower-level forge.pkcs12 certBag API construction was needed. The Pitfall 3 concern from RESEARCH.md did not materialize with node-forge 1.4.0.

Deviations from Plan

Auto-fixed Issues

None — plan executed exactly as written.

Known Stubs

None — mergeCerts is now fully implemented. All four cert-manager service methods are complete.

Deferred Items (Out of Scope — Phase 8)

Pre-existing dashboard test failures (NOT caused by this plan):

  • dashboard-grid.test.tsx: 2 failures — react-grid-layout mock missing noCompactor export
  • note-widget.test.tsx: 3 failures — fetch assertion errors (hideToolbar-Prop issue from 01.07)

These were tracked in M git status before plan execution. Logged to context for Phase 8 cleanup.

Threat Model Compliance

Threat ID Status
T-09-01 (malformed input → unhandled throw) Mitigated — try/catch on all forge operations in mergeCerts → BadRequestException
T-09-02 (PFX password handling) Mitigated — password never logged, only used in toPkcs12Asn1 MAC; never in filename or response
T-09-03 (multi-upload DoS) Mitigated — FilesInterceptor maxCount 20 + fileSize 5 MB (wired in Plan 01)
T-09-04 (unauthenticated) Mitigated — global JwtAuthGuard + @UseModule('cert-manager') guard (Plan 01)

Self-Check: PASSED

Check Result
apps/api/src/cert-manager/cert-manager.service.ts FOUND + MODIFIED
apps/api/src/cert-manager/cert-manager.service.spec.ts FOUND + MODIFIED
apps/web/src/app/(portal)/modules/cert-manager/actions.ts FOUND + MODIFIED
apps/web/src/app/(portal)/modules/cert-manager/components/MergeTab.tsx FOUND + MODIFIED
apps/web/src/app/(portal)/modules/cert-manager/components/ConvertTab.tsx FOUND + MODIFIED
apps/web/src/app/(portal)/modules/cert-manager/page.tsx FOUND + MODIFIED
apps/web/src/app/(portal)/modules/cert-manager/cert-manager.test.tsx FOUND + MODIFIED
Commit f43e92c (RED mergeCerts spec) FOUND
Commit 6326064 (GREEN mergeCerts + pfx) FOUND
Commit 8b15a00 (MergeTab UI + tests) FOUND
27/27 API cert-manager tests passing VERIFIED
19/19 web cert-manager tests passing VERIFIED
toPkcs12Asn1 in service VERIFIED
2-file guard in controller VERIFIED
mergeCertsAction in actions.ts VERIFIED
PFX option in ConvertTab VERIFIED
Merge button disabled < 2 files VERIFIED
Password field on PFX output VERIFIED
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