Web-based check-in interface (#1985)

src/pretix/plugins/webcheckin/signals.py

@@ -0,0 +1,27 @@
+from django.dispatch import receiver
+from django.urls import reverse
+from django.utils.safestring import mark_safe
+from django.utils.translation import gettext_lazy as _
+
+from pretix.control.signals import nav_event
+
+
+@receiver(nav_event, dispatch_uid='webcheckin_nav_event')
+def navbar_entry(sender, request, **kwargs):
+    url = request.resolver_match
+    if not request.user.has_event_permission(request.organizer, request.event, ('can_change_orders', 'can_checkin_orders'), request=request):
+        return []
+    return [{
+        'label': mark_safe(_('Web Check-in') + ' <span class="label label-success">beta</span>'),
+        'url': reverse('plugins:webcheckin:index', kwargs={
+            'event': request.event.slug,
+            'organizer': request.organizer.slug,
+        }),
+        'parent': reverse('control:event.orders.checkinlists', kwargs={
+            'event': request.event.slug,
+            'organizer': request.event.organizer.slug,
+        }),
+        'external': True,
+        'icon': 'check-square-o',
+        'active': url.namespace == 'plugins:webcheckin' and url.url_name.startswith('index'),
+    }]