Fix #3701 -- Don't use static cookie_domain on custom domains (#3728)

src/pretix/presale/views/__init__.py

@@ -54,6 +54,7 @@ from pretix.base.models import (
 from pretix.base.services.cart import get_fees
 from pretix.base.templatetags.money import money_filter
 from pretix.helpers.cookies import set_cookie_without_samesite
+from pretix.multidomain.middlewares import get_cookie_domain
 from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.signals import question_form_fields
 
@@ -468,7 +469,7 @@ def iframe_entry_view_wrapper(view_func):
                 locale,
                 max_age=max_age,
                 expires=(datetime.utcnow() + timedelta(seconds=max_age)).strftime('%a, %d-%b-%Y %H:%M:%S GMT'),
-                domain=settings.SESSION_COOKIE_DOMAIN
+                domain=get_cookie_domain(request)
             )
             return resp
 

src/pretix/presale/views/locale.py

@@ -40,6 +40,7 @@ from django.utils.http import url_has_allowed_host_and_scheme
 from django.views.generic import View
 
 from pretix.helpers.cookies import set_cookie_without_samesite
+from pretix.multidomain.middlewares import get_cookie_domain
 
 from .robots import NoSearchIndexViewMixin
 
@@ -62,7 +63,7 @@ class LocaleSet(NoSearchIndexViewMixin, View):
                 max_age=max_age,
                 expires=(datetime.utcnow() + timedelta(seconds=max_age)).strftime(
                     '%a, %d-%b-%Y %H:%M:%S GMT'),
-                domain=settings.SESSION_COOKIE_DOMAIN
+                domain=get_cookie_domain(request)
             )
 
         return resp