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CartManager: allow extending expiry of valid positions only up to max_extend

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Mira Weller
2025-05-14 17:11:58 +02:00
parent b045274d8c
commit 29205c490d
1 changed files with 18 additions and 13 deletions
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31
src/pretix/base/services/cart.py
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@@ -46,6 +46,7 @@ from django.conf import settings
from django.core.exceptions import ValidationError
from django.db import DatabaseError, transaction
from django.db.models import Count, Exists, IntegerField, OuterRef, Q, Value
from django.db.models.aggregates import Max
from django.dispatch import receiver
from django.utils.timezone import make_aware, now
from django.utils.translation import (
@@ -304,6 +305,7 @@ class CartManager:
else:
self._reservation_time = timedelta(minutes=self.event.settings.get('reservation_time', as_type=int))
self._expiry = self.real_now_dt + self._reservation_time
self._max_expiry_extend = self.real_now_dt + (self._reservation_time * 11)
@property
def positions(self):
@@ -318,14 +320,6 @@ class CartManager:
self._seated_cache[item, subevent] = item.seat_category_mappings.filter(subevent=subevent).exists()
return self._seated_cache[item, subevent]
def _calculate_expiry(self):
if self._explicit_expiry:
self._expiry = self._explicit_expiry
else:
self._expiry = self.real_now_dt + timedelta(
minutes=self.event.settings.get('reservation_time', as_type=int)
)
def _check_presale_dates(self):
if self.event.presale_start and time_machine_now(self.real_now_dt) < self.event.presale_start:
raise CartError(error_messages['not_started'])
@@ -342,9 +336,18 @@ class CartManager:
raise CartError(error_messages['payment_ended'])
def _extend_expiry_of_valid_existing_positions(self):
# Make sure we do not extend past the max_extend timestamp, allowing users to extend their valid positions up
# to 11 times the reservation time. After that, positions will expire, but can still be re-validated using
# ExtendOperation.
max_extend_existing = self.positions.filter(expires__gt=self.real_now_dt).aggregate(m=Max('max_extend'))['m']
if max_extend_existing:
self._expiry = min(self._expiry, max_extend_existing)
self._max_expiry_extend = max_extend_existing
# Extend this user's cart session to ensure all items in the cart expire at the same time
# We can extend the reservation of items which are not yet expired without risk
self.positions.filter(expires__gt=self.real_now_dt).update(expires=self._expiry)
if self._expiry > self.real_now_dt:
self.positions.filter(expires__gt=self.real_now_dt).update(expires=self._expiry)
def _delete_out_of_timeframe(self):
err = None
@@ -1259,6 +1262,7 @@ class CartManager:
item=op.item,
variation=op.variation,
expires=self._expiry,
max_extend=self._max_expiry_extend,
cart_id=self.cart_id,
voucher=op.voucher,
addon_to=op.addon_to if op.addon_to else None,
@@ -1307,7 +1311,9 @@ class CartManager:
event=self.event,
item=b.item,
variation=b.variation,
expires=self._expiry, cart_id=self.cart_id,
expires=self._expiry,
max_extend=self._max_expiry_extend,
cart_id=self.cart_id,
voucher=None,
addon_to=cp,
subevent=b.subevent,
@@ -1334,12 +1340,13 @@ class CartManager:
op.position.delete()
elif available_count == 1:
op.position.expires = self._expiry
op.position.max_extend = self._max_expiry_extend
op.position.listed_price = op.listed_price
op.position.price_after_voucher = op.price_after_voucher
# op.position.price will be updated by recompute_final_prices_and_taxes()
if op.position.pk not in deleted_positions:
try:
op.position.save(force_update=True, update_fields=['expires', 'listed_price', 'price_after_voucher'])
op.position.save(force_update=True, update_fields=['expires', 'max_extend', 'listed_price', 'price_after_voucher'])
except DatabaseError:
# Best effort... The position might have been deleted in the meantime!
pass
@@ -1434,8 +1441,6 @@ class CartManager:
err = self.extend_expired_positions() or err
err = err or self._check_min_per_voucher()
self.real_now_dt = now()
self._extend_expiry_of_valid_existing_positions()
err = self._perform_operations() or err
self.recompute_final_prices_and_taxes()