red/.planning/phases/06-signing-flow/06-05-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
06-signing-flow	05	ui, api	jwt pdf signing next.js jose download	phase provides 06-04 POST /api/sign/[token] returning ok:true + documents.signedFilePath populated phase provides 06-01 token.ts with createSigningToken/verifySigningToken and jose JWT utilities	Confirmation page at /sign/[token]/confirmed — success checkmark, document name, signed timestamp, download button GET /api/sign/[token]/download — streams signedFilePath PDF using 15-min download JWT (dt query param) createDownloadToken / verifyDownloadToken in token.ts — short-lived download-only JWTs (no DB record) router.push navigation to confirmed page after successful POST submit	07-phase (any future phase referencing signing completion flow)	added patterns Short-lived single-purpose JWT (purpose:'download') for client file download authorization, no DB row needed Server-side download token generation at page render time passed as query param Uint8Array cast for Buffer -> Response BodyInit compatibility in Next.js 16	created modified teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx (replaced placeholder) teressa-copeland-homes/src/lib/signing/token.ts teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx	Download token uses purpose:'download' claim — same SIGNING_JWT_SECRET but separate purpose discriminator, no DB storage needed for 15-min TTL Buffer cast to Uint8Array for Response constructor BodyInit type compatibility (Next.js 16 / TypeScript strict) router.push replaces window.location.href for confirmed redirect — SPA navigation, consistent with Next.js patterns Download token generated server-side at confirmed page render; valid 15min from page load	Short-lived download JWT pattern: SignJWT({ documentId, purpose: 'download' }) + 15m expiry, no DB row needed for ephemeral download auth Buffer -> Uint8Array cast for Response BodyInit in Next.js 16 API routes	SIGN-06	3min	2026-03-20

Phase 06 Plan 05: Post-Signing Confirmation + Client PDF Download Summary

Post-signing confirmation page with document name, signed timestamp, and 15-min download token; GET /api/sign/[token]/download streams signedFilePath PDF authorized by short-lived download JWT

Performance

• Duration: 3 min
• Started: 2026-03-20T17:40:19Z
• Completed: 2026-03-20T17:42:56Z
• Tasks: 2
• Files modified: 4

Accomplishments

• Extended token.ts with createDownloadToken / verifyDownloadToken using purpose:'download' claim and 15-min TTL (no DB row)
• Created GET /api/sign/[token]/download route: validates dt query param JWT, path traversal guard, streams signedFilePath as application/pdf with Content-Disposition: attachment
• Replaced static placeholder confirmed/page.tsx with full server component: verifies signing token, fetches document name + signed timestamp, generates download token, renders success UX per locked design decisions
• Updated SigningPageClient.tsx to use router.push (via useRouter) instead of window.location.href for confirmed page navigation

Task Commits

Each task was committed atomically:

1. Task 1: Download token utilities + download API route - a276da0 (feat)
2. Task 2: Confirmation page + redirect from signing client - 4cdd9ee (feat)

Plan metadata: (docs commit — pending final step)

Files Created/Modified

• teressa-copeland-homes/src/lib/signing/token.ts - Added createDownloadToken and verifyDownloadToken exports
• teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts - New: GET download handler with JWT validation + PDF streaming
• teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx - Replaced static placeholder with full server component (doc name, timestamp, download button)
• teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx - Switched window.location.href to router.push for confirmed navigation

Decisions Made

• Download token uses same SIGNING_JWT_SECRET but purpose:'download' discriminates from signing tokens — no DB record needed for 15-min ephemeral download
• Buffer cast to Uint8Array for Response constructor compatibility in Next.js 16 TypeScript strict mode
• router.push preferred over window.location.href for SPA navigation consistency with Next.js App Router

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed Buffer type incompatibility with Response BodyInit

• Found during: Task 1 (download API route)
• Issue: new Response(fileBuffer, ...) failed TypeScript type check — Buffer<ArrayBufferLike> is not assignable to BodyInit | null | undefined in Next.js 16 strict mode
• Fix: Cast fileBuffer as new Uint8Array(fileBuffer) before passing to Response constructor
• Files modified: teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
• Verification: npm run build passes cleanly
• Committed in: a276da0 (Task 1 commit)

---

Total deviations: 1 auto-fixed (1 type/bug fix) Impact on plan: Auto-fix necessary for build correctness. No scope creep.

Issues Encountered

• Next.js 16 TypeScript strict mode rejects Buffer as Response body — required Uint8Array cast (type compatibility, not runtime behavior change).

User Setup Required

None — no external service configuration required.

Next Phase Readiness

• Complete e-signing ceremony is end-to-end: send link -> view PDF -> sign all fields -> submit -> confirmation page -> download signed PDF
• SIGN-06 requirement fulfilled: confirmation page with checkmark, document name, timestamp, download button
• Phase 6 (signing flow) is fully complete — all 5 plans executed
• Ready for Phase 7 or production deployment when DNS/email is configured

---

Phase: 06-signing-flow Completed: 2026-03-20

Self-Check: PASSED

• FOUND: teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx
• FOUND: teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
• FOUND: .planning/phases/06-signing-flow/06-05-SUMMARY.md
• FOUND commit: a276da0 (Task 1)
• FOUND commit: 4cdd9ee (Task 2)