Implement ticket download dates (closes #15)

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

@@ -24,6 +24,31 @@
             </div>
         </div>
     {% endif %}
+    {% if order.status == 'p' and event.settings.ticket_download %}
+        <div class="panel panel-primary">
+            <div class="panel-heading">
+                <h3 class="panel-title">{% trans "Ticket download" %}</h3>
+            </div>
+            <div class="panel-body">
+                {% if can_download %}
+                    <p>
+                        {% blocktrans trimmed %}
+                            Please use the buttons below to obtain your ticket. Please have your ticket ready when
+                            entering the event.
+                        {% endblocktrans %}
+                    </p>
+                    <a href="{% url "presale:event.order.download" organizer=request.event.organizer.slug event=request.event.slug order=order.code %}"
+                            class="btn btn-primary">
+                        <span class="fa fa-print"></span> {% trans "Download PDF" %}
+                    </a>
+                {% else %}
+                    {% blocktrans trimmed with date=event.settings.ticket_download_date|date %}
+                        You will be able to download your tickets here on {{ date }}.
+                    {% endblocktrans %}
+                {% endif %}
+            </div>
+        </div>
+    {% endif %}
     <div class="panel panel-primary cart">
         <div class="panel-heading">
             {% if order.can_modify_answers %}

src/pretix/presale/views/order.py

@@ -2,6 +2,7 @@ from io import StringIO, BytesIO
 from django.contrib import messages
 from django.core.urlresolvers import reverse
 from django.shortcuts import redirect
+from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
 from django.utils.functional import cached_property
 from django.views.generic import TemplateView, View
@@ -48,6 +49,11 @@ class OrderDetails(EventViewMixin, EventLoginRequiredMixin, OrderDetailMixin,
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
         ctx['order'] = self.order
+        ctx['can_download'] = (
+            self.request.event.settings.ticket_download
+            and now() > self.request.event.settings.ticket_download_date
+            and self.order.status == Order.STATUS_PAID
+        )
         ctx['cart'] = self.get_cart(
             answers=True,
             queryset=OrderPosition.objects.current.filter(order=self.order)
@@ -144,6 +150,13 @@ class OrderCancel(EventViewMixin, EventLoginRequiredMixin, OrderDetailMixin,
 class OrderDownload(EventViewMixin, EventLoginRequiredMixin, OrderDetailMixin,
                     View):
 
+    def get_order_url(self):
+        return reverse('presale:event.order', kwargs={
+            'event': self.request.event.slug,
+            'organizer': self.request.event.organizer.slug,
+            'order': self.order.code,
+        })
+
     def get(self, request, *args, **kwargs):
         from reportlab.graphics.shapes import Drawing
         from reportlab.pdfgen import canvas
@@ -151,8 +164,14 @@ class OrderDownload(EventViewMixin, EventLoginRequiredMixin, OrderDetailMixin,
         from reportlab.graphics.barcode.qr import QrCodeWidget
         from reportlab.graphics import renderPDF
         from PyPDF2 import PdfFileWriter, PdfFileReader
+
         if self.order.status != Order.STATUS_PAID:
-            return HttpResponseForbidden(_('Order is not paid'))
+            messages.error(request, _('Order is not paid.'))
+            return redirect(self.get_order_url())
+        if not self.request.event.settings.ticket_download or now() < self.request.event.settings.ticket_download_date:
+            messages.error(request, _('Ticket download is not (yet) enabled.'))
+            return redirect(self.get_order_url())
+
         response = HttpResponse(content_type='application/pdf')
         response['Content-Disposition'] = 'inline; filename="order%s%s.pdf"' % (request.event.slug, self.order.code)