Supporting invoice-on-demand instead of autogeneration

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

@@ -113,9 +113,28 @@
                     </div>
                 </div>
             </div>
+        {% elif request.event.settings.invoice_generate == 'user' %}
+            <div class="col-xs-12 {% if request.event.settings.invoice_address_asked %}col-md-6{% endif %}">
+                <div class="panel panel-primary">
+                    <div class="panel-heading">
+                        <h3 class="panel-title">
+                            {% trans "Invoices" %}
+                        </h3>
+                    </div>
+                    <div class="panel-body">
+                        <form class="form-inline helper-display-inline" method="post"
+                                action="{% eventurl event "presale:event.order.geninvoice" order=order.code secret=order.secret %}">
+                            {% csrf_token %}
+                            <button class="btn btn-default">
+                                {% trans "Request invoice" %}
+                            </button>
+                        </form>
+                    </div>
+                </div>
+            </div>
         {% endif %}
         {% if request.event.settings.invoice_address_asked %}
-            <div class="col-xs-12 {% if invoices %}col-md-6{% endif %}">
+            <div class="col-xs-12 {% if invoices or request.event.settings.invoice_generate == 'user' %}col-md-6{% endif %}">
                 <div class="panel panel-primary">
                     <div class="panel-heading">
                         {% if order.can_modify_answers %}

src/pretix/presale/urls.py

@@ -20,6 +20,9 @@ event_patterns = [
         name='event.checkout'),
     url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/$', pretix.presale.views.order.OrderDetails.as_view(),
         name='event.order'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/invoice$',
+        pretix.presale.views.order.OrderInvoiceCreate.as_view(),
+        name='event.order.geninvoice'),
     url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/cancel$',
         pretix.presale.views.order.OrderCancel.as_view(),
         name='event.order.cancel'),

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"