Seating frame view: Allow to pass a voucher from query parameter

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

@@ -26,9 +26,9 @@
     {% csrf_token %}
     <input type="hidden" name="subevent" value="{{ subevent.id|default_if_none:"" }}"/>
     {% if event.has_subevents %}
-        {% eventsignal event "pretix.presale.signals.render_seating_plan" request=request subevent=subevent %}
+        {% eventsignal event "pretix.presale.signals.render_seating_plan" request=request subevent=subevent voucher=voucher %}
     {% else %}
-        {% eventsignal event "pretix.presale.signals.render_seating_plan" request=request %}
+        {% eventsignal event "pretix.presale.signals.render_seating_plan" request=request voucher=voucher %}
     {% endif %}
 </form>
 {% include "pretixpresale/fragment_modals.html" %}

src/pretix/presale/views/event.py

@@ -700,6 +700,22 @@ class SeatingPlanView(EventViewMixin, TemplateView):
                                                 kwargs={'cart_namespace': kwargs.get('cart_namespace') or ''})
         if context['cart_redirect'].startswith('https:'):
             context['cart_redirect'] = '/' + context['cart_redirect'].split('/', 3)[3]
+
+        v = self.request.GET.get('voucher')
+        if v:
+            v = v.strip()
+            try:
+                voucher = self.request.event.vouchers.get(code__iexact=v)
+                if voucher.redeemed >= voucher.max_usages or voucher.valid_until is not None \
+                        and voucher.valid_until < now() or voucher.item is not None \
+                        and voucher.item.is_available() is False:
+                    voucher = None
+            except Voucher.DoesNotExist:
+                voucher = None
+        else:
+            voucher = None
+        context['voucher'] = voucher
+
         return context