start implementing time machine mode

src/pretix/base/models/event.py

@@ -80,6 +80,15 @@ from .organizer import Organizer, Team
 logger = logging.getLogger(__name__)
 
 
+def annotate_with_time_based_properties(events_or_subevents, now_dt):
+    print("annotate_with_time_based_properties", now_dt)
+    for e_s in events_or_subevents:
+        if e_s:
+            e_s.presale_is_running = e_s.presale_is_running_by_time(now_dt)
+            e_s.presale_has_ended = e_s.presale_has_ended_by_time(now_dt)
+    return events_or_subevents
+
+
 class EventMixin:
     def clean(self):
         if self.presale_start and self.presale_end and self.presale_start > self.presale_end:
@@ -229,17 +238,17 @@ class EventMixin:
         else:
             return self.presale_end
 
-    @property
-    def presale_has_ended(self):
+    def presale_has_ended_by_time(self, now_dt: datetime=None):
         """
         Is true, when ``presale_end`` is set and in the past.
         """
+        now_dt = now_dt or now()
         if self.effective_presale_end:
-            return now() > self.effective_presale_end
+            return now_dt > self.effective_presale_end
         elif self.date_to:
-            return now() > self.date_to
+            return now_dt > self.date_to
         else:
-            return now().astimezone(self.timezone).date() > self.date_from.astimezone(self.timezone).date()
+            return now_dt.astimezone(self.timezone).date() > self.date_from.astimezone(self.timezone).date()
 
     @property
     def effective_presale_start(self):
@@ -253,15 +262,15 @@ class EventMixin:
         else:
             return self.presale_start
 
-    @property
-    def presale_is_running(self):
+    def presale_is_running_by_time(self, now_dt: datetime=None):
         """
         Is true, when ``presale_end`` is not set or in the future and ``presale_start`` is not
         set or in the past.
         """
-        if self.effective_presale_start and now() < self.effective_presale_start:
+        now_dt = now_dt or now()
+        if self.effective_presale_start and now_dt < self.effective_presale_start:
             return False
-        return not self.presale_has_ended
+        return not self.presale_has_ended_by_time(now_dt)
 
     @property
     def event_microdata(self):
@@ -683,12 +692,12 @@ class Event(EventMixin, LoggedModel):
 
         return qs_annotated
 
-    @property
-    def presale_has_ended(self):
+    def presale_has_ended_by_time(self, now_dt: datetime = None):
+        now_dt = now_dt or now()
         if self.has_subevents:
-            return self.presale_end and now() > self.presale_end
+            return self.presale_end and now_dt > self.presale_end
         else:
-            return super().presale_has_ended
+            return super().presale_has_ended_by_time(now_dt)
 
     def delete_all_orders(self, really=False):
         from .checkin import Checkin

src/pretix/presale/checkoutflow.py

@@ -545,6 +545,7 @@ class AddOnsStep(CartMixin, AsyncAction, TemplateFlowStep):
                             )
                             if getattr(self.request, 'customer', None) else None
                         ),
+                        now_dt=self.request.now_dt,
                     )
                     item_cache[ckey] = items
                 else:

src/pretix/presale/forms/waitinglist.py

@@ -59,6 +59,7 @@ class WaitingListForm(forms.ModelForm):
                 )
                 if customer else None
             ),
+            now_dt=request.now_dt,
         )
         for i in items:
             if not i.allow_waitinglist:

src/pretix/presale/middleware.py

@@ -32,8 +32,11 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under the License.
 
+from dateutil.parser import parse
+
 from django.template.response import TemplateResponse
 from django.urls import resolve
+from django.utils.timezone import now
 from django_scopes import scope
 
 from pretix.base.channels import WebshopSalesChannel
@@ -79,3 +82,27 @@ class EventMiddleware:
                 response = response.render()
 
         return response
+
+
+class TimeMachineMiddleware:
+    def __init__(self, get_response=None):
+        self.get_response = get_response
+        super().__init__()
+
+    def __call__(self, request):
+        if hasattr(request, 'event') and hasattr(request, '_namespace') and request._namespace == 'presale' and \
+                'time_machine' in request.COOKIES and \
+                request.user.has_event_permission(request.organizer, request.event, 'can_change_event_settings', request):
+            print("setting now_dt from cookie")
+            request.now_dt = parse(request.COOKIES['time_machine'])
+            request.now_dt_is_fake = True
+        else:
+            print("setting now_dt to now",
+                  "hasevent?",hasattr(request, 'event') ,
+                  "namespace?",hasattr(request, '_namespace') and request._namespace,
+                  "cookies?",request.COOKIES)
+            request.now_dt = now()
+
+        return self.get_response(request)
+
+

src/pretix/presale/templates/pretixpresale/event/base.html

@@ -33,6 +33,17 @@
             </div>
         </div>
     {% endif %}
+    {% if request.now_dt_is_fake %}
+        <div class="offline-banner">
+            <div class="container">
+                <span class="fa fa-user-secret" aria-hidden="true"></span>
+                {% trans "You are currently using the time machine. The ticket shop is rendered as if it were" %} {{ request.now_dt }}
+                <a href="#">
+                    {% trans "Go back to current time" %}
+                </a>
+            </div>
+        </div>
+    {% endif %}
     <div class="container page-header-links {% if event.settings.theme_color_background|upper != "#FFFFFF" or event_logo_image_large %}page-header-links-outside{% endif %}">
         {% if event.settings.locales|length > 1 or request.organizer.settings.customer_accounts %}
             {% if event.settings.theme_color_background|upper != "#FFFFFF" or event_logo_image_large %}

src/pretix/presale/views/cart.py

@@ -569,6 +569,7 @@ class RedeemView(NoSearchIndexViewMixin, EventViewMixin, CartMixin, TemplateView
                     testmode=self.request.event.testmode
                 ) if getattr(self.request, 'customer', None) else None
             ),
+            now_dt=self.request.now_dt,
         )
 
         # Calculate how many options the user still has. If there is only one option, we can

src/pretix/presale/views/checkout.py

@@ -55,7 +55,7 @@ class CheckoutView(View):
             messages.error(request, _("Your cart is empty"))
             return self.redirect(self.get_index_url(self.request))
 
-        if not request.event.presale_is_running:
+        if not request.event.presale_is_running_by_time(request.now_dt):
             messages.error(request, _("The booking period for this event is over or has not yet started."))
             return self.redirect(self.get_index_url(self.request))
 

src/pretix/presale/views/event.py

@@ -64,7 +64,7 @@ from pretix.base.channels import get_all_sales_channels
 from pretix.base.models import (
     ItemVariation, Quota, SeatCategoryMapping, Voucher,
 )
-from pretix.base.models.event import Event, SubEvent
+from pretix.base.models.event import Event, SubEvent, annotate_with_time_based_properties
 from pretix.base.models.items import (
     ItemAddOn, ItemBundle, SubEventItem, SubEventItemVariation,
 )
@@ -105,7 +105,8 @@ def item_group_by_category(items):
 
 def get_grouped_items(event, subevent=None, voucher=None, channel='web', require_seat=0, base_qs=None, allow_addons=False,
                       quota_cache=None, filter_items=None, filter_categories=None, memberships=None,
-                      ignore_hide_sold_out_for_item_ids=None):
+                      ignore_hide_sold_out_for_item_ids=None, now_dt: datetime=None):
+    now_dt = now_dt or now()
     base_qs_set = base_qs is not None
     base_qs = base_qs if base_qs is not None else event.items
 
@@ -119,8 +120,8 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
         requires_seat = Value(0, output_field=IntegerField())
 
     variation_q = (
-        Q(Q(available_from__isnull=True) | Q(available_from__lte=now()) | Q(available_from_mode='info')) &
-        Q(Q(available_until__isnull=True) | Q(available_until__gte=now()) | Q(available_until_mode='info'))
+        Q(Q(available_from__isnull=True) | Q(available_from__lte=now_dt) | Q(available_from_mode='info')) &
+        Q(Q(available_until__isnull=True) | Q(available_until__gte=now_dt) | Q(available_until_mode='info'))
     )
     if not voucher or not voucher.show_hidden_items:
         variation_q &= Q(hide_without_voucher=False)
@@ -137,8 +138,8 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
             subevent_disabled=Exists(
                 SubEventItemVariation.objects.filter(
                     Q(disabled=True)
-                    | (Exact(OuterRef('available_from_mode'), 'hide') & Q(available_from__gt=now()))
-                    | (Exact(OuterRef('available_until_mode'), 'hide') & Q(available_until__lt=now())),
+                    | (Exact(OuterRef('available_from_mode'), 'hide') & Q(available_from__gt=now_dt))
+                    | (Exact(OuterRef('available_until_mode'), 'hide') & Q(available_until__lt=now_dt)),
                     variation_id=OuterRef('pk'),
                     subevent=subevent,
                 )
@@ -209,8 +210,8 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
         subevent_disabled=Exists(
             SubEventItem.objects.filter(
                 Q(disabled=True)
-                | (Exact(OuterRef('available_from_mode'), 'hide') & Q(available_from__gt=now()))
-                | (Exact(OuterRef('available_until_mode'), 'hide') & Q(available_until__lt=now())),
+                | (Exact(OuterRef('available_from_mode'), 'hide') & Q(available_from__gt=now_dt))
+                | (Exact(OuterRef('available_until_mode'), 'hide') & Q(available_until__lt=now_dt)),
                 item_id=OuterRef('pk'),
                 subevent=subevent,
             )
@@ -306,7 +307,7 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
                 item._remove = True
                 continue
 
-        item.current_unavailability_reason = item.unavailability_reason(has_voucher=voucher, subevent=subevent)
+        item.current_unavailability_reason = item.unavailability_reason(now_dt=now_dt, has_voucher=voucher, subevent=subevent)
 
         item.description = str(item.description)
         for recv, resp in item_description.send(sender=event, item=item, variation=None, subevent=subevent):
@@ -422,7 +423,7 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
                 if not display_add_to_cart:
                     display_add_to_cart = not item.requires_seat and var.order_max > 0
 
-                var.current_unavailability_reason = var.unavailability_reason(has_voucher=voucher, subevent=subevent)
+                var.current_unavailability_reason = var.unavailability_reason(now_dt=now_dt, has_voucher=voucher, subevent=subevent)
 
             item.original_price = (
                 item.tax(item.original_price, currency=event.currency, include_bundled=True,
@@ -535,6 +536,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
 
         context['ev'] = self.subevent or self.request.event
         context['subevent'] = self.subevent
+        annotate_with_time_based_properties([self.request.event, self.subevent], self.request.now_dt)
 
         # Show voucher option if an event is selected and vouchers exist
         vouchers_exist = self.request.event.cache.get('vouchers_exist')
@@ -543,10 +545,10 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
             self.request.event.cache.set('vouchers_exist', vouchers_exist)
         context['show_vouchers'] = context['vouchers_exist'] = vouchers_exist and (
             (self.request.event.has_subevents and not self.subevent) or
-            context['ev'].presale_is_running
+            context['ev'].presale_is_running_by_time(self.request.now_dt)
         )
 
-        context['allow_waitinglist'] = self.request.event.settings.waiting_list_enabled and context['ev'].presale_is_running
+        context['allow_waitinglist'] = self.request.event.settings.waiting_list_enabled and context['ev'].presale_is_running_by_time(self.request.now_dt)
 
         if not self.request.event.has_subevents or self.subevent:
             # Fetch all items
@@ -562,6 +564,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
                         testmode=self.request.event.testmode
                     ) if getattr(self.request, 'customer', None) else None
                 ),
+                now_dt=self.request.now_dt
             )
 
             context['waitinglist_seated'] = False
@@ -612,7 +615,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
 
         context['show_cart'] = (
             context['cart']['positions'] and (
-                self.request.event.has_subevents or self.request.event.presale_is_running
+                self.request.event.has_subevents or self.request.event.presale_is_running_by_time(self.request.now_dt)
             )
         )
         if self.request.event.settings.redirect_to_checkout_directly:
@@ -679,6 +682,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
                 limit_before, after, ebd, set(), self.request.event,
                 self.kwargs.get('cart_namespace'),
                 voucher,
+                now_dt=self.request.now_dt,
             )
 
             # Hide names of subevents in event series where it is always the same.  No need to show the name of the museum thousands of times
@@ -738,6 +742,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
                 limit_before, after, ebd, set(), self.request.event,
                 self.kwargs.get('cart_namespace'),
                 voucher,
+                now_dt=self.request.now_dt,
             )
 
             # Hide names of subevents in event series where it is always the same.  No need to show the name of the museum thousands of times
@@ -776,7 +781,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
                 future_only=self.request.event.settings.event_calendar_future_only
             )
         else:
-            context['subevent_list'] = self.request.event.subevents_sorted(
+            context['subevent_list'] = annotate_with_time_based_properties(self.request.event.subevents_sorted(
                 filter_qs_by_attr(
                     self.request.event.subevents_annotated(
                         self.request.sales_channel.identifier,
@@ -784,7 +789,8 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
                     ).using(settings.DATABASE_REPLICA),
                     self.request
                 )
-            )
+            ), self.request.now_dt)
+
             if self.request.event.settings.event_list_available_only and not voucher:
                 context['subevent_list'] = [
                     se for se in context['subevent_list']

src/pretix/presale/views/order.py

@@ -1311,7 +1311,8 @@ class OrderChangeMixin:
                                 )
                                 if self.order.customer else None
                             ),
-                            ignore_hide_sold_out_for_item_ids={k[0] for k in current_addon_products.keys()}
+                            ignore_hide_sold_out_for_item_ids={k[0] for k in current_addon_products.keys()},
+                            now_dt=self.request.now_dt,
                         )
                         item_cache[ckey] = items
                     else:

src/pretix/presale/views/organizer.py

@@ -63,6 +63,7 @@ from pretix.base.i18n import language
 from pretix.base.models import (
     Event, EventMetaValue, Organizer, Quota, SubEvent, SubEventMetaValue,
 )
+from pretix.base.models.event import annotate_with_time_based_properties
 from pretix.base.services.quotas import QuotaAvailability
 from pretix.helpers.compat import date_fromisocalendar
 from pretix.helpers.daterange import daterange
@@ -549,14 +550,16 @@ def add_events_for_days(request, baseqs, before, after, ebd, timezones):
             })
 
 
-def add_subevents_for_days(qs, before, after, ebd, timezones, event=None, cart_namespace=None, voucher=None):
+def add_subevents_for_days(qs, before, after, ebd, timezones, event=None, cart_namespace=None, voucher=None, now_dt=None):
+    print("add_subevents_for_days", now_dt)
+    now_dt = now_dt or now()
     qs = qs.filter(active=True, is_public=True).filter(
         Q(Q(date_to__gte=before) & Q(date_from__lte=after)) |
         Q(Q(date_to__isnull=True) & Q(date_from__gte=before) & Q(date_from__lte=after))
     ).order_by(
         'date_from'
     )
-
+    qs = annotate_with_time_based_properties(qs, now_dt)
     quotas_to_compute = []
     for se in qs:
         if se.presale_is_running:

src/pretix/presale/views/widget.py

@@ -256,6 +256,7 @@ class WidgetAPIProductList(EventListMixin, View):
                     testmode=self.request.event.testmode
                 ) if getattr(self.request, 'customer', None) else None
             ),
+            now_dt=self.request.now_dt,
         )
 
         grps = []
@@ -409,11 +410,11 @@ class WidgetAPIProductList(EventListMixin, View):
                 availability['color'] = 'none'
                 availability['text'] = gettext('More info')
                 availability['reason'] = 'unknown'
-        elif ev.presale_is_running:
+        elif ev.presale_is_running_by_time(self.request.now_dt):
             availability['color'] = 'green'
             availability['text'] = gettext('Book now')
             availability['reason'] = 'ok'
-        elif ev.presale_has_ended:
+        elif ev.presale_has_ended_by_time(self.request.now_dt):
             availability['color'] = 'red'
             availability['text'] = gettext('Sale over')
             availability['reason'] = 'over'

src/pretix/settings.py

@@ -443,6 +443,7 @@ MIDDLEWARE = [
     'pretix.base.middleware.LocaleMiddleware',
     'pretix.base.middleware.SecurityMiddleware',
     'pretix.presale.middleware.EventMiddleware',
+    'pretix.presale.middleware.TimeMachineMiddleware',
     'pretix.api.middleware.ApiScopeMiddleware',
 ]