New signals: fee_calculation_for_cart, order_fee_calculation

src/pretix/base/services/cart.py

@@ -20,6 +20,7 @@ from pretix.base.services.async import ProfiledTask
 from pretix.base.services.locking import LockTimeoutException
 from pretix.base.services.pricing import get_price
 from pretix.celery_app import app
+from pretix.presale.signals import fee_calculation_for_cart
 
 
 class CartError(LazyLocaleException):
@@ -627,7 +628,7 @@ def update_tax_rates(event: Event, cart_id: str, invoice_address: InvoiceAddress
     return totaldiff
 
 
-def get_fees(event, total, invoice_address, provider):
+def get_fees(event, request, total, invoice_address, provider):
     fees = []
 
     if total == 0:
@@ -643,7 +644,7 @@ def get_fees(event, total, invoice_address, provider):
                 if payment_fee_tax_rule.tax_applicable(invoice_address):
                     payment_fee_tax = payment_fee_tax_rule.tax(payment_fee, base_price_is='gross')
                     fees.append(OrderFee(
-                        fee_type="PAYMENT",
+                        fee_type=OrderFee.FEE_TYPE_PAYMENT,
                         value=payment_fee,
                         tax_rate=payment_fee_tax.rate,
                         tax_value=payment_fee_tax.tax,
@@ -651,13 +652,16 @@ def get_fees(event, total, invoice_address, provider):
                     ))
                 else:
                     fees.append(OrderFee(
-                        fee_type="PAYMENT",
+                        fee_type=OrderFee.FEE_TYPE_PAYMENT,
                         value=payment_fee,
                         tax_rate=Decimal('0.00'),
                         tax_value=Decimal('0.00'),
                         tax_rule=payment_fee_tax_rule
                     ))
 
+    for recv, resp in fee_calculation_for_cart.send(sender=event, request=request, invoice_address=invoice_address):
+        fees += resp
+
     return fees
 
 

src/pretix/base/services/orders.py

@@ -34,7 +34,9 @@ from pretix.base.services.invoices import (
 from pretix.base.services.locking import LockTimeoutException
 from pretix.base.services.mail import SendMailException
 from pretix.base.services.pricing import get_price
-from pretix.base.signals import order_paid, order_placed, periodic_task
+from pretix.base.signals import (
+    order_fee_calculation, order_paid, order_placed, periodic_task,
+)
 from pretix.celery_app import app
 from pretix.multidomain.urlreverse import build_absolute_uri
 
@@ -342,7 +344,8 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
         raise OrderError(err, errargs)
 
 
-def _get_fees(positions: List[CartPosition], payment_provider: BasePaymentProvider):
+def _get_fees(positions: List[CartPosition], payment_provider: BasePaymentProvider, address: InvoiceAddress,
+              meta_info: dict, event: Event):
     fees = []
     total = sum([c.price for c in positions])
     payment_fee = payment_provider.calculate_fee(total)
@@ -350,15 +353,18 @@ def _get_fees(positions: List[CartPosition], payment_provider: BasePaymentProvid
         fees.append(OrderFee(fee_type=OrderFee.FEE_TYPE_PAYMENT, value=payment_fee,
                              internal_type=payment_provider.identifier))
 
+    for recv, resp in order_fee_calculation.send(sender=event, invoice_address=address,
+                                                 meta_info=meta_info, posiitons=positions):
+        fees += resp
     return fees
 
 
 def _create_order(event: Event, email: str, positions: List[CartPosition], now_dt: datetime,
-                  payment_provider: BasePaymentProvider, locale: str=None, address: int=None,
+                  payment_provider: BasePaymentProvider, locale: str=None, address: InvoiceAddress=None,
                   meta_info: dict=None):
     from datetime import time
 
-    fees = _get_fees(positions, payment_provider)
+    fees = _get_fees(positions, payment_provider, address, meta_info, event)
     total = sum([c.price for c in positions]) + sum([c.value for c in fees])
 
     tz = pytz.timezone(event.settings.timezone)

src/pretix/base/signals.py

@@ -209,3 +209,16 @@ register_global_settings = django.dispatch.Signal()
 All plugins that are installed may send fields for the global settings form, as
 an OrderedDict of (setting name, form field).
 """
+
+order_fee_calculation = EventPluginSignal(
+    providing_args=['request']
+)
+"""
+This signals allows you to add fees to an order while it is being created. You are expected to
+return a list of ``OrderFee`` objects that are not yet saved to the database
+(because there is no order yet).
+
+As with all plugin signals, the ``sender`` keyword argument will contain the event. A ``positions``
+argument will contain the cart positions and ``invoice_address`` the invoice address (useful for
+tax calculation). The argument ``meta_info`` contains the order's meta dictionary.
+"""

src/pretix/presale/signals.py

@@ -68,7 +68,6 @@ You will recieve the request triggering the order creation as the ``request`` ke
 
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """
-
 checkout_confirm_page_content = EventPluginSignal(
     providing_args=['request']
 )
@@ -80,6 +79,18 @@ As with all plugin signals, the ``sender`` keyword argument will contain the eve
 argument will contain the request object.
 """
 
+fee_calculation_for_cart = EventPluginSignal(
+    providing_args=['request']
+)
+"""
+This signals allows you to add fees to a cart. You are expected to return a list of ``OrderFee``
+objects that are not yet saved to the database (because there is no order yet).
+
+As with all plugin signals, the ``sender`` keyword argument will contain the event. A ``request``
+argument will contain the request object and ``invoice_address`` the invoice address (useful for
+tax calculation).
+"""
+
 contact_form_fields = EventPluginSignal(
     providing_args=[]
 )

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

@@ -159,7 +159,7 @@
 {% for fee in cart.fees %}
     <div class="row cart-row">
         <div class="col-md-4 col-xs-6">
-            <strong>{% trans "Payment method fee" %}</strong>
+            <strong>{{ fee.get_fee_type_display }}</strong>
         </div>
         <div class="col-md-3 col-xs-6 col-md-offset-5 price">
             {% if event.settings.display_net_prices %}

src/pretix/presale/views/__init__.py

@@ -110,7 +110,7 @@ class CartMixin:
                 except InvoiceAddress.DoesNotExist:
                     pass
 
-            fees = get_fees(self.request.event, total, ia, self.request.session.get('payment'))
+            fees = get_fees(self.request.event, self.request, total, ia, self.request.session.get('payment'))
 
         total += sum([f.value for f in fees])
         net_total += sum([f.net_value for f in fees])