Supporting invoice-on-demand instead of autogeneration

src/pretix/control/forms/event.py

@@ -182,9 +182,15 @@ class EventSettingsForm(SettingsForm):
         help_text=_("Does only work if an invoice address is asked for. VAT ID is not required."),
         required=False
     )
-    invoice_generate = forms.BooleanField(
+    invoice_generate = forms.ChoiceField(
         label=_("Generate invoices"),
-        required=False
+        required=False,
+        choices=(
+            ('False', _('No')),
+            ('admin', _('Manually in admin panel')),
+            ('user', _('Automatically on user request')),
+            ('True', _('Automatically for all created orders'))
+        )
     )
     invoice_address_from = forms.CharField(
         widget=forms.Textarea(attrs={'rows': 5}), required=False,

src/pretix/control/templates/pretixcontrol/order/index.html

@@ -1,5 +1,6 @@
 {% extends "pretixcontrol/event/base.html" %}
 {% load i18n %}
+{% load eventurl %}
 {% block title %}
     {% blocktrans trimmed with code=order.code %}
         Order details: {{ code }}
@@ -105,6 +106,17 @@
                                     {% endif %}
                                 {% endfor %}
                             </dd>
+                        {% elif request.event.settings.invoice_generate == 'admin' or request.event.settings.invoice_generate == 'user' %}
+                            <dt>{% trans "Invoices" %}</dt>
+                            <dd>
+                                <form class="form-inline helper-display-inline" method="post"
+                                        action="{% url "control:event.order.geninvoice" event=request.event.slug organizer=request.event.organizer.slug code=order.code %}">
+                                    {% csrf_token %}
+                                    <button class="btn btn-default btn-xs">
+                                        {% trans "Generate invoice" %}
+                                    </button>
+                                </form>
+                            </dd>
                         {% endif %}
                     </dl>
                 </div>

src/pretix/control/urls.py

@@ -66,6 +66,8 @@ urlpatterns = [
             name='event.order.transition'),
         url(r'^orders/(?P<code>[0-9A-Z]+)/resend$', orders.OrderResendLink.as_view(),
             name='event.order.resendlink'),
+        url(r'^orders/(?P<code>[0-9A-Z]+)/invoice$', orders.OrderInvoiceCreate.as_view(),
+            name='event.order.geninvoice'),
         url(r'^orders/(?P<code>[0-9A-Z]+)/extend$', orders.OrderExtend.as_view(),
             name='event.order.extend'),
         url(r'^orders/(?P<code>[0-9A-Z]+)/$', orders.OrderDetail.as_view(), name='event.order'),

src/pretix/control/views/orders.py

@@ -18,7 +18,7 @@ from pretix.base.models import (
 )
 from pretix.base.services import tickets
 from pretix.base.services.export import export
-from pretix.base.services.invoices import invoice_pdf
+from pretix.base.services.invoices import generate_invoice, invoice_pdf
 from pretix.base.services.mail import mail
 from pretix.base.services.orders import cancel_order, mark_order_paid
 from pretix.base.services.stats import order_overview
@@ -209,6 +209,21 @@ class OrderTransition(OrderView):
             return HttpResponseNotAllowed(['POST'])
 
 
+class OrderInvoiceCreate(OrderView):
+    permission = 'can_change_orders'
+
+    def post(self, *args, **kwargs):
+        if self.request.event.settings.get('invoice_generate') not in ('admin', '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 OrderResendLink(OrderView):
     permission = 'can_change_orders'