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feat: return buyers to the calling app after Stripe, branded QR endpoint

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`_resolve_frontend_root` honours `CreateTicket.frontend_url` when its
origin is one of LNBITS_CORS_ALLOWED_ORIGINS, the LNbits base URL or
LNBITS_CUSTOM_FRONTEND_URL (400 otherwise — a silent fallback would send
the buyer to the wrong app), and falls back to request.base_url as before.
Under that root the fiat path now parameterises the hosted checkout via
`extra["checkout"]` (lnbits StripeCheckoutOptions): success_url
`/events/{id}?checkout=success&tickets=<ids>`, cancel_url
`/events/{id}?checkout=cancelled`, customer_email, an event-named line
item and event_id/quantity/ticket_ids metadata. Ticket ids are minted
before the invoice so the success URL can carry them (the payment_hash
only exists afterwards). ticket_base_url on the rows uses the same root,
so the emailed link lands in the webapp when the webapp was the client.

Purchases are gated on `effective_payment_methods(event)` (checked after
the free-ticket short-circuit, which charges nothing on any rail).

New anonymous `GET /events/api/v1/qr/{ticket_id}` returns a PNG of
`ticket://<id>` — port of upstream v1.6.8's endpoint without ticket-image
compositing — built at error-correction H with the instance QR logo
(`lnbits_qr_logo`) pasted in the centre, matching the client-side QRs.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EYwoAkZZmXMMmaBp4WGUBo
This commit is contained in:
Padreug 2026-09-06 19:53:05 +02:00
commit f77ad28bdd
4 changed files with 292 additions and 20 deletions
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__init__.py
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@ -6,12 +6,13 @@ from loguru import logger
from .crud import db
from .tasks import wait_for_paid_invoices
from .views import events_generic_router
from .views_api import events_api_router, tickets_api_router
from .views_api import events_api_router, qr_api_router, tickets_api_router
events_ext: APIRouter = APIRouter(prefix="/events", tags=["Events"])
events_ext.include_router(events_generic_router)
events_ext.include_router(events_api_router)
events_ext.include_router(tickets_api_router)
events_ext.include_router(qr_api_router)
events_static_files = [
{