QR codes on RSVP confirmations, a phone-friendly door scanner, walk-in
support, and a live arrivals widget that updates over WebSocket. Closes
the final Tier 2 block.
Schema (migration 0013)
- check_ins (id, guest_id UNIQUE, checked_in_at, checked_in_by,
arrival_count, notes, walk_in). UNIQUE on guest_id is the
double-check-in guard at the DB layer; signature validation lives
in the QR JWT.
QR JWT
- internal/auth/checkin_qr.go: CheckInQRSigner mints {event_id,
guest_id, exp} payloads with the platform's existing HMAC secret.
Issue() extends expiry to eventDate+24h so a QR minted weeks in
advance still scans on the day. Parse() distinguishes
ErrExpiredJWT from generic ErrInvalidJWT so the API can render a
friendlier 410.
- Unit tests cover round-trip, wrong-secret rejection, expiry
detection, and short-secret refusal at construction time.
Domain + storage
- domain.CheckIn + CheckInSummary
- storage.CheckInRepo: Record (returns ErrAlreadyCheckedIn on the
unique violation), ListByEvent, Summary (arrived headcount,
expected headcount, guests-checked-in count), GuestBelongsToEvent
(belt-and-braces guard against a forged JWT pointing at a
different event's guest).
API
- GET /access/{token} now embeds a check_in payload (raw JWT + a
base64-encoded PNG via skip2/go-qrcode) for attending RSVPs, so
the confirmation page can render the code straight into an <img>.
- POST /events/{id}/check-in — editor+. Validates the QR JWT,
refuses cross-event payloads (400), refuses expired ones (410),
records the row, broadcasts check_in.recorded over the existing
WS hub so the live dashboard updates.
- POST /events/{id}/walk-ins — editor+. Creates the guest + check-in
in one logical op for a door-add who wasn't on the original list.
- GET /events/{id}/check-ins — viewer+. Returns the list and the
summary together so the dashboard widget hydrates in one call.
Frontend
- New CheckInCard.vue: live arrivals widget ("47 of 60 · 78%" plus
a progress bar), recent-arrivals list, Walk-in button, and a
"Start scanning" button that opens a full-screen camera modal.
jsQR loaded from CDN on first open (no bundler dep). Scan
throttling + dedupe prevents the 30fps camera loop from POSTing
N times per paper QR. Successful scan vibrates the phone.
Duplicate (409) → "Already checked in" toast; expired (410) →
"This code has expired"; foreign-event (400) → "doesn't look
like one of your guests".
- New "Check-in" tab on the event-detail page, between
Communications and Branding.
- RSVP confirmation card + revisit card both surface a "Save for
the day" / "Your door code" QR block for attending guests. The
PNG ships pre-rendered from the API so the frontend doesn't need
its own QR library.
- The submit flow now refetches /access after a successful POST so
the QR appears immediately on first submit, not just on revisit.
Tests
- Backend unit tests for the QR signer (round-trip, wrong-secret,
expired, short-secret rejection).
- Integration: TestCheckInHappyPath (scan -> 200, double-scan ->
409, summary reflects arrival), TestCheckInRejectsForeignQR
(event A's JWT can't be used on event B), TestWalkInCreatesGuest
AndCheckIn (door-add creates both rows).
- Full integration suite passes (188.3s, 41 tests / 80+ subtests).
Tier 2 is complete: Blocks A through H all shipped.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Kwaku Danso
003a320690