Preview for ticket outputs

src/pretix/control/templates/pretixcontrol/event/tickets.html

@@ -10,13 +10,14 @@
             {% bootstrap_field form.ticket_download layout="horizontal" %}
             {% bootstrap_field form.ticket_download_date layout="horizontal" %}
             {% for provider in providers %}
-                <div class="panel panel-default">
+                <div class="panel panel-default ticketoutput-panel">
                     <div class="panel-heading">
-                        <div class="row">
-                            <div class="col-sm-10">
-                                <h3 class="panel-title">{{ provider.verbose_name }}</h3>
-                            </div>
-                        </div>
+                        <a href="{% url "control:event.settings.tickets.preview" event=request.event.slug organizer=request.organizer.slug output=provider.identifier %}"
+                            class="btn btn-default btn-sm pull-right" target="_blank">
+                            {% trans "Preview" %}
+                        </a>
+                        <h3 class="panel-title">{{ provider.verbose_name }}</h3>
+                        <div class="clear"></div>
                     </div>
                     <div class="panel-body">
                         {% bootstrap_form provider.form layout='horizontal' %}

src/pretix/control/urls.py

@@ -42,6 +42,8 @@ urlpatterns = [
         url(r'^settings/permissions$', event.EventPermissions.as_view(), name='event.settings.permissions'),
         url(r'^settings/payment$', event.PaymentSettings.as_view(), name='event.settings.payment'),
         url(r'^settings/tickets$', event.TicketSettings.as_view(), name='event.settings.tickets'),
+        url(r'^settings/tickets/preview/(?P<output>[^/]+)$', event.TicketSettingsPreview.as_view(),
+            name='event.settings.tickets.preview'),
         url(r'^settings/email$', event.MailSettings.as_view(), name='event.settings.mail'),
         url(r'^settings/invoice$', event.InvoiceSettings.as_view(), name='event.settings.invoice'),
         url(r'^settings/invoice/preview$', event.InvoicePreview.as_view(), name='event.settings.invoice.preview'),

src/pretix/control/views/event.py

@@ -18,6 +18,7 @@ from pretix.base.forms import I18nModelForm
 from pretix.base.models import (
     Event, EventPermission, Item, ItemVariation, User,
 )
+from pretix.base.services import tickets
 from pretix.base.services.invoices import build_preview_invoice_pdf
 from pretix.base.signals import (
     register_payment_providers, register_ticket_outputs,
@@ -378,6 +379,35 @@ class MailSettings(EventSettingsFormView):
             return self.get(request)
 
 
+class TicketSettingsPreview(EventPermissionRequiredMixin, View):
+    permission = 'can_change_settings'
+
+    @cached_property
+    def output(self):
+        responses = register_ticket_outputs.send(self.request.event)
+        for receiver, response in responses:
+            provider = response(self.request.event)
+            if provider.identifier == self.kwargs.get('output'):
+                return provider
+
+    def get(self, request, *args, **kwargs):
+        if not self.output:
+            messages.error(request, _('You requested an invalid ticket output type.'))
+            return redirect(self.get_error_url())
+
+        fname, mimet, data = tickets.preview(self.request.event.pk, self.output.identifier)
+        resp = HttpResponse(data, content_type=mimet)
+        ftype = fname.split(".")[-1]
+        resp['Content-Disposition'] = 'attachment; filename="ticket-preview.{}"'.format(ftype)
+        return resp
+
+    def get_error_url(self) -> str:
+        return reverse('control:event.settings.tickets', kwargs={
+            'organizer': self.request.event.organizer.slug,
+            'event': self.request.event.slug
+        })
+
+
 class TicketSettings(EventPermissionRequiredMixin, FormView):
     model = Event
     form_class = TicketSettingsForm