New handling of plugin URLs (#609)

src/pretix/multidomain/__init__.py

@@ -1,4 +1,5 @@
 from django.apps import AppConfig
+from django.urls import RegexURLPattern
 
 
 class PretixMultidomainConfig(AppConfig):
@@ -7,3 +8,12 @@ class PretixMultidomainConfig(AppConfig):
 
 
 default_app_config = 'pretix.multidomain.PretixMultidomainConfig'
+
+
+def event_url(regex, view, kwargs=None, name=None, require_live=True):
+    if callable(view):
+        r = RegexURLPattern(regex, view, kwargs, name)
+        r._require_live = require_live
+        return r
+    else:
+        raise TypeError('view must be a callable.')