119edc2491
- Post-signing confirmation page with success checkmark, document name, timestamp, 15-min download token - GET /api/sign/[token]/download streams signedFilePath PDF via short-lived download JWT - Phase 6 (signing flow) all 5 plans complete - SIGN-06 requirement marked complete
135 lines
6.4 KiB
Markdown
135 lines
6.4 KiB
Markdown
---
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phase: 06-signing-flow
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plan: "05"
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subsystem: ui, api
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tags: [jwt, pdf, signing, next.js, jose, download]
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# Dependency graph
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requires:
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- phase: 06-04
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provides: POST /api/sign/[token] returning ok:true + documents.signedFilePath populated
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- phase: 06-01
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provides: token.ts with createSigningToken/verifySigningToken and jose JWT utilities
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provides:
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- Confirmation page at /sign/[token]/confirmed — success checkmark, document name, signed timestamp, download button
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- GET /api/sign/[token]/download — streams signedFilePath PDF using 15-min download JWT (dt query param)
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- createDownloadToken / verifyDownloadToken in token.ts — short-lived download-only JWTs (no DB record)
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- router.push navigation to confirmed page after successful POST submit
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affects:
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- 07-phase (any future phase referencing signing completion flow)
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- Short-lived single-purpose JWT (purpose:'download') for client file download authorization, no DB row needed
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- Server-side download token generation at page render time passed as query param
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- Uint8Array cast for Buffer -> Response BodyInit compatibility in Next.js 16
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key-files:
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created:
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- teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
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- teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx (replaced placeholder)
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modified:
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- teressa-copeland-homes/src/lib/signing/token.ts
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- teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx
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key-decisions:
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- "Download token uses purpose:'download' claim — same SIGNING_JWT_SECRET but separate purpose discriminator, no DB storage needed for 15-min TTL"
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- "Buffer cast to Uint8Array for Response constructor BodyInit type compatibility (Next.js 16 / TypeScript strict)"
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- "router.push replaces window.location.href for confirmed redirect — SPA navigation, consistent with Next.js patterns"
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- "Download token generated server-side at confirmed page render; valid 15min from page load"
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patterns-established:
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- "Short-lived download JWT pattern: SignJWT({ documentId, purpose: 'download' }) + 15m expiry, no DB row needed for ephemeral download auth"
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- "Buffer -> Uint8Array cast for Response BodyInit in Next.js 16 API routes"
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requirements-completed:
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- SIGN-06
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# Metrics
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duration: 3min
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completed: 2026-03-20
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---
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# Phase 06 Plan 05: Post-Signing Confirmation + Client PDF Download Summary
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**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**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-03-20T17:40:19Z
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- **Completed:** 2026-03-20T17:42:56Z
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- **Tasks:** 2
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- **Files modified:** 4
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## Accomplishments
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- Extended `token.ts` with `createDownloadToken` / `verifyDownloadToken` using `purpose:'download'` claim and 15-min TTL (no DB row)
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- Created `GET /api/sign/[token]/download` route: validates `dt` query param JWT, path traversal guard, streams `signedFilePath` as `application/pdf` with `Content-Disposition: attachment`
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- 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
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- Updated `SigningPageClient.tsx` to use `router.push` (via `useRouter`) instead of `window.location.href` for confirmed page navigation
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Download token utilities + download API route** - `a276da0` (feat)
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2. **Task 2: Confirmation page + redirect from signing client** - `4cdd9ee` (feat)
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**Plan metadata:** (docs commit — pending final step)
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## Files Created/Modified
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- `teressa-copeland-homes/src/lib/signing/token.ts` - Added `createDownloadToken` and `verifyDownloadToken` exports
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- `teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts` - New: GET download handler with JWT validation + PDF streaming
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- `teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx` - Replaced static placeholder with full server component (doc name, timestamp, download button)
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- `teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx` - Switched `window.location.href` to `router.push` for confirmed navigation
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## Decisions Made
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- Download token uses same `SIGNING_JWT_SECRET` but `purpose:'download'` discriminates from signing tokens — no DB record needed for 15-min ephemeral download
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- `Buffer` cast to `Uint8Array` for `Response` constructor compatibility in Next.js 16 TypeScript strict mode
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- `router.push` preferred over `window.location.href` for SPA navigation consistency with Next.js App Router
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed Buffer type incompatibility with Response BodyInit**
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- **Found during:** Task 1 (download API route)
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- **Issue:** `new Response(fileBuffer, ...)` failed TypeScript type check — `Buffer<ArrayBufferLike>` is not assignable to `BodyInit | null | undefined` in Next.js 16 strict mode
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- **Fix:** Cast `fileBuffer` as `new Uint8Array(fileBuffer)` before passing to `Response` constructor
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- **Files modified:** `teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts`
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- **Verification:** `npm run build` passes cleanly
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- **Committed in:** a276da0 (Task 1 commit)
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---
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**Total deviations:** 1 auto-fixed (1 type/bug fix)
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**Impact on plan:** Auto-fix necessary for build correctness. No scope creep.
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## Issues Encountered
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- Next.js 16 TypeScript strict mode rejects `Buffer` as `Response` body — required `Uint8Array` cast (type compatibility, not runtime behavior change).
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## User Setup Required
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None — no external service configuration required.
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## Next Phase Readiness
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- Complete e-signing ceremony is end-to-end: send link -> view PDF -> sign all fields -> submit -> confirmation page -> download signed PDF
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- SIGN-06 requirement fulfilled: confirmation page with checkmark, document name, timestamp, download button
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- Phase 6 (signing flow) is fully complete — all 5 plans executed
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- Ready for Phase 7 or production deployment when DNS/email is configured
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---
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*Phase: 06-signing-flow*
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*Completed: 2026-03-20*
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## Self-Check: PASSED
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- FOUND: teressa-copeland-homes/src/app/sign/[token]/confirmed/page.tsx
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- FOUND: teressa-copeland-homes/src/app/api/sign/[token]/download/route.ts
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- FOUND: .planning/phases/06-signing-flow/06-05-SUMMARY.md
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- FOUND commit: a276da0 (Task 1)
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- FOUND commit: 4cdd9ee (Task 2)
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