Feature/optional team provisioning (#1487)

* Event creation: Add option to select existing team instead of provisioning.

* Event creation: disallow event team provisioning on organizer level.

* Event team provisioning: update default setting location and display strings.

* Update src/pretix/control/views/main.py

Co-Authored-By: Raphael Michel <mail@raphaelmichel.de>

src/pretix/control/forms/event.py

@@ -22,7 +22,7 @@ from pytz import common_timezones, timezone
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.email import get_available_placeholders
 from pretix.base.forms import I18nModelForm, PlaceholderValidator, SettingsForm
-from pretix.base.models import Event, Organizer, TaxRule
+from pretix.base.models import Event, Organizer, TaxRule, Team
 from pretix.base.models.event import EventMetaValue, SubEvent
 from pretix.base.reldate import RelativeDateField, RelativeDateTimeField
 from pretix.base.settings import PERSON_NAME_SCHEMES, PERSON_NAME_TITLE_GROUPS
@@ -101,6 +101,16 @@ class EventWizardBasicsForm(I18nModelForm):
         required=False
     )
 
+    team = forms.ModelChoiceField(
+        label=_("Grant access to team"),
+        help_text=_("You are allowed to create events under this organizer, however you do not have permission "
+                    "to edit all events under this organizer. Please select one of your existing teams that will"
+                    " be granted access to this event."),
+        queryset=Team.objects.none(),
+        required=False,
+        empty_label=_('Create a new team for this event with me as the only member')
+    )
+
     class Meta:
         model = Event
         fields = [
@@ -133,7 +143,7 @@ class EventWizardBasicsForm(I18nModelForm):
         self.organizer = kwargs.pop('organizer')
         self.locales = kwargs.get('locales')
         self.has_subevents = kwargs.pop('has_subevents')
-        kwargs.pop('user')
+        self.user = kwargs.pop('user')
         kwargs.pop('session')
         super().__init__(*args, **kwargs)
         self.initial['timezone'] = get_current_timezone_name()
@@ -147,6 +157,15 @@ class EventWizardBasicsForm(I18nModelForm):
             del self.fields['presale_start']
             del self.fields['presale_end']
 
+        if self.has_control_rights(self.user, self.organizer):
+            del self.fields['team']
+        else:
+            self.fields['team'].queryset = self.user.teams.filter(organizer=self.organizer)
+            if not self.organizer.settings.get("event_team_provisioning", True, as_type=bool):
+                self.fields['team'].required = True
+                self.fields['team'].empty_label = None
+                self.fields['team'].initial = 0
+
     def clean(self):
         data = super().clean()
         if data.get('locale') not in self.locales:
@@ -179,6 +198,13 @@ class EventWizardBasicsForm(I18nModelForm):
             )
         return slug
 
+    @staticmethod
+    def has_control_rights(user, organizer):
+        return user.teams.filter(
+            organizer=organizer, all_events=True, can_change_event_settings=True, can_change_items=True,
+            can_change_orders=True, can_change_vouchers=True
+        ).exists()
+
 
 class EventChoiceMixin:
     def label_from_instance(self, obj):