New plugin signal order_valid_if_pending (#3337)

doc/development/api/general.rst

@@ -21,7 +21,7 @@ Order events
 There are multiple signals that will be sent out in the ordering cycle:
 
 .. automodule:: pretix.base.signals
-   :members: validate_cart, validate_cart_addons, validate_order, order_fee_calculation, order_paid, order_placed, order_canceled, order_reactivated, order_expired, order_modified, order_changed, order_approved, order_denied, order_fee_type_name, allow_ticket_download, order_split, order_gracefully_delete, invoice_line_text
+   :members: validate_cart, validate_cart_addons, validate_order, order_valid_if_pending, order_fee_calculation, order_paid, order_placed, order_canceled, order_reactivated, order_expired, order_modified, order_changed, order_approved, order_denied, order_fee_type_name, allow_ticket_download, order_split, order_gracefully_delete, invoice_line_text
 
 Check-ins
 """""""""

src/pretix/base/services/orders.py

@@ -95,7 +95,8 @@ from pretix.base.services.tasks import ProfiledEventTask, ProfiledTask
 from pretix.base.signals import (
     allow_ticket_download, order_approved, order_canceled, order_changed,
     order_denied, order_expired, order_fee_calculation, order_paid,
-    order_placed, order_split, periodic_task, validate_order,
+    order_placed, order_split, order_valid_if_pending, periodic_task,
+    validate_order,
 )
 from pretix.celery_app import app
 from pretix.helpers import OF_SELF
@@ -922,7 +923,7 @@ def _get_fees(positions: List[CartPosition], payment_requests: List[dict], addre
 def _create_order(event: Event, email: str, positions: List[CartPosition], now_dt: datetime,
                   payment_requests: List[dict], locale: str=None, address: InvoiceAddress=None,
                   meta_info: dict=None, sales_channel: str='web', shown_total=None,
-                  customer=None):
+                  customer=None, valid_if_pending=False):
     payments = []
     sales_channel = get_all_sales_channels()[sales_channel]
 
@@ -950,6 +951,7 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
             require_approval=require_approval,
             sales_channel=sales_channel.identifier,
             customer=customer,
+            valid_if_pending=valid_if_pending,
         )
         if customer:
             order.email_known_to_work = customer.is_verified
@@ -1094,6 +1096,20 @@ def _perform_order(event: Event, payment_requests: List[dict], position_ids: Lis
         customer=customer,
     )
 
+    valid_if_pending = False
+    for recv, result in order_valid_if_pending.send(
+            event,
+            payments=payment_requests,
+            email=email,
+            positions=positions,
+            locale=locale,
+            invoice_address=addr,
+            meta_info=meta_info,
+            customer=customer,
+    ):
+        if result:
+            valid_if_pending = True
+
     lockfn = NoLockManager
     locked = False
     if positions.filter(Q(voucher__isnull=False) | Q(expires__lt=now() + timedelta(minutes=2)) | Q(seat__isnull=False)).exists():
@@ -1117,7 +1133,7 @@ def _perform_order(event: Event, payment_requests: List[dict], position_ids: Lis
         _check_positions(event, now_dt, positions, address=addr, sales_channel=sales_channel, customer=customer)
         order, payment_objs = _create_order(event, email, positions, now_dt, payment_requests,
                                             locale=locale, address=addr, meta_info=meta_info, sales_channel=sales_channel,
-                                            shown_total=shown_total, customer=customer)
+                                            shown_total=shown_total, customer=customer, valid_if_pending=valid_if_pending)
         try:
             for p in payment_objs:
                 if p.provider == 'free':

src/pretix/base/signals.py

@@ -304,8 +304,7 @@ multiple events. Receivers should return a subclass of pretix.base.exporter.Base
 The ``sender`` keyword argument will contain an organizer.
 """
 
-validate_order = EventPluginSignal(
-)
+validate_order = EventPluginSignal()
 """
 Arguments: ``payments``, ``positions``, ``email``, ``locale``, ``invoice_address``,
 ``meta_info``, ``customer``
@@ -321,6 +320,18 @@ As with all event-plugin signals, the ``sender`` keyword argument will contain t
 in the future, as the ``payments`` attribute gives more information.
 """
 
+order_valid_if_pending = EventPluginSignal()
+"""
+Arguments: ``payments``, ``positions``, ``email``, ``locale``, ``invoice_address``,
+``meta_info``, ``customer``
+
+This signal is sent out when the user tries to confirm the order, before we actually create
+the order. It allows you to set the ``valid_if_pending`` of the order even before it is
+created. Whenever any plugin returns ``True``, the order will be valid if pending.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
 validate_cart = EventPluginSignal()
 """
 Arguments: ``positions``