Preview for ticket outputs

src/pretix/base/services/tickets.py

@@ -1,9 +1,14 @@
 from datetime import timedelta
 
 from django.core.files.base import ContentFile
+from django.db import transaction
 from django.utils.timezone import now
+from django.utils.translation import ugettext as _
 
-from pretix.base.models import CachedFile, CachedTicket, Order, cachedfile_name
+from pretix.base.i18n import language
+from pretix.base.models import (
+    CachedFile, CachedTicket, Event, Order, cachedfile_name,
+)
 from pretix.base.signals import register_ticket_outputs
 from pretix.celery import app
 
@@ -20,10 +25,40 @@ def generate(order: str, provider: str):
         ct.cachedfile = cf
         ct.save()
 
-    responses = register_ticket_outputs.send(order.event)
-    for receiver, response in responses:
-        prov = response(order.event)
-        if prov.identifier == provider:
-            ct.cachedfile.filename, ct.cachedfile.type, data = prov.generate(order)
-            ct.cachedfile.file.save(cachedfile_name(ct.cachedfile, ct.cachedfile.filename), ContentFile(data))
-            ct.cachedfile.save()
+    with language(order.locale):
+        responses = register_ticket_outputs.send(order.event)
+        for receiver, response in responses:
+            prov = response(order.event)
+            if prov.identifier == provider:
+                ct.cachedfile.filename, ct.cachedfile.type, data = prov.generate(order)
+                ct.cachedfile.file.save(cachedfile_name(ct.cachedfile, ct.cachedfile.filename), ContentFile(data))
+                ct.cachedfile.save()
+
+
+class DummyRollbackException(Exception):
+    pass
+
+
+def preview(event: int, provider: str):
+    event = Event.objects.get(id=event)
+    res = None
+
+    try:
+        with transaction.atomic(), language(event.settings.locale):
+            item = event.items.create(name=_("Sample product"), default_price=42.23)
+
+            order = event.orders.create(status=Order.STATUS_PENDING, datetime=now(),
+                                        expires=now(), code="PREVIEW1234", total=119)
+
+            order.positions.create(item=item, attendee_name=_("John Doe"), price=item.default_price)
+
+            responses = register_ticket_outputs.send(event)
+            for receiver, response in responses:
+                prov = response(event)
+                if prov.identifier == provider:
+                    res = prov.generate(order)
+            raise DummyRollbackException()
+    except DummyRollbackException:
+        return res
+    else:
+        raise Exception('Invalid state, should have rolled back.')

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

src/static/pretixcontrol/scss/_forms.scss

@@ -114,3 +114,6 @@ div[data-formset-body], div[data-formset-form], div[data-nested-formset-form], d
     }
   }
 }
+.ticketoutput-panel .panel-title {
+  line-height: 30px;
+}