Supporting invoice-on-demand instead of autogeneration

src/pretix/presale/views/order.py

@@ -1,6 +1,7 @@
 from datetime import timedelta
 
 from django.contrib import messages
+from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.shortcuts import redirect
@@ -13,7 +14,7 @@ from pretix.base.models import (
     CachedFile, CachedTicket, Invoice, Order, OrderPosition,
 )
 from pretix.base.models.orders import InvoiceAddress
-from pretix.base.services.invoices import invoice_pdf
+from pretix.base.services.invoices import generate_invoice, invoice_pdf
 from pretix.base.services.orders import OrderError, cancel_order
 from pretix.base.services.tickets import generate
 from pretix.base.signals import (
@@ -145,6 +146,26 @@ class OrderPay(EventViewMixin, OrderDetailMixin, TemplateView):
         })
 
 
+class OrderInvoiceCreate(EventViewMixin, OrderDetailMixin, View):
+
+    def dispatch(self, request, *args, **kwargs):
+        self.request = request
+        if not self.order:
+            raise Http404(_('Unknown order code or not authorized to access this order.'))
+        return super().dispatch(request, *args, **kwargs)
+
+    def post(self, request, *args, **kwargs):
+        if self.request.event.settings.get('invoice_generate') != 'user':
+            messages.error(self.request, _('You cannot generate an invoice for this order.'))
+        elif self.order.invoices.exists():
+            messages.error(self.request, _('An invoice for this order already exists.'))
+        else:
+            generate_invoice(self.order)
+            self.order.log_action('pretix.event.order.invoice.generate', user=self.request.user)
+            messages.success(self.request, _('The invoice has been generated.'))
+        return redirect(self.get_order_url())
+
+
 class OrderPayDo(EventViewMixin, OrderDetailMixin, TemplateView):
     template_name = "pretixpresale/event/order_pay_confirm.html"