feat: add reservation QR retrieval

backend/bookings/views.py

@@ -10,6 +10,7 @@ from .serializers import (
     ReservationConfirmSerializer,
     ReservationCreateResponseSerializer,
     ReservationCreateSerializer,
+    ReservationQRResponseSerializer,
 )
 from .services import (
     AlreadyConfirmedReservation,
@@ -17,8 +18,10 @@ from .services import (
     InvalidToken,
     NotEnoughSeats,
     PerformanceNotAvailable,
+    ReservationNotConfirmed,
     confirm_reservation_from_token,
     create_pending_reservation,
+    retrieve_reservation_qr_from_token,
 )
 
 
@@ -87,3 +90,25 @@ def confirm_reservation(request):
 
     response_serializer = ReservationConfirmResponseSerializer(result)
     return Response(response_serializer.data)
+
+
+@api_view(["GET"])
+def retrieve_reservation_qr(request):
+    serializer = ReservationConfirmSerializer(data=request.query_params)
+    serializer.is_valid(raise_exception=True)
+
+    try:
+        result = retrieve_reservation_qr_from_token(serializer.validated_data["token"])
+    except InvalidToken as exc:
+        return Response(
+            {"status": "invalid_token", "detail": str(exc)},
+            status=status.HTTP_404_NOT_FOUND,
+        )
+    except ReservationNotConfirmed as exc:
+        return Response(
+            {"status": "reservation_not_confirmed", "detail": str(exc)},
+            status=status.HTTP_409_CONFLICT,
+        )
+
+    response_serializer = ReservationQRResponseSerializer(result)
+    return Response(response_serializer.data)