Self-service refund form (#1135)

* Auto-refund

* Add missing template

* Notification for requested refund

* Model-level tests

* Add front-end tests

* Default to notify

src/pretix/control/views/event.py

@@ -41,10 +41,10 @@ from pretix.base.signals import register_ticket_outputs
 from pretix.base.templatetags.money import money_filter
 from pretix.base.templatetags.rich_text import markdown_compile
 from pretix.control.forms.event import (
-    CommentForm, DisplaySettingsForm, EventDeleteForm, EventMetaValueForm,
-    EventSettingsForm, EventUpdateForm, InvoiceSettingsForm, MailSettingsForm,
-    PaymentSettingsForm, ProviderForm, QuickSetupForm,
-    QuickSetupProductFormSet, TaxRuleForm, TaxRuleLineFormSet,
+    CancelSettingsForm, CommentForm, DisplaySettingsForm, EventDeleteForm,
+    EventMetaValueForm, EventSettingsForm, EventUpdateForm,
+    InvoiceSettingsForm, MailSettingsForm, PaymentSettingsForm, ProviderForm,
+    QuickSetupForm, QuickSetupProductFormSet, TaxRuleForm, TaxRuleLineFormSet,
     TicketSettingsForm, WidgetCodeForm,
 )
 from pretix.control.permissions import EventPermissionRequiredMixin
@@ -407,6 +407,43 @@ class InvoiceSettings(EventSettingsViewMixin, EventSettingsFormView):
         })
 
 
+class CancelSettings(EventSettingsViewMixin, EventSettingsFormView):
+    model = Event
+    form_class = CancelSettingsForm
+    template_name = 'pretixcontrol/event/cancel.html'
+    permission = 'can_change_event_settings'
+
+    def get_success_url(self) -> str:
+        return reverse('control:event.settings.cancel', kwargs={
+            'organizer': self.request.event.organizer.slug,
+            'event': self.request.event.slug
+        })
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data()
+        ctx['gets_notification'] = self.request.user.notifications_send and (
+            (
+                self.request.user.notification_settings.filter(
+                    event=self.request.event,
+                    action_type='pretix.event.order.refund.requested',
+                    enabled=True
+                ).exists()
+            ) or (
+                self.request.user.notification_settings.filter(
+                    event__isnull=True,
+                    action_type='pretix.event.order.refund.requested',
+                    enabled=True
+                ).exists() and not
+                self.request.user.notification_settings.filter(
+                    event=self.request.event,
+                    action_type='pretix.event.order.refund.requested',
+                    enabled=False
+                ).exists()
+            )
+        )
+        return ctx
+
+
 class InvoicePreview(EventPermissionRequiredMixin, View):
     permission = 'can_change_event_settings'