New handling of plugin URLs (#609)

src/pretix/multidomain/plugin_handler.py

@@ -0,0 +1,11 @@
+from pretix.presale.utils import _event_view
+
+
+def plugin_event_urls(urllist, plugin):
+    for entry in urllist:
+        if hasattr(entry, 'url_patterns'):
+            plugin_event_urls(entry.url_patterns, plugin)
+        elif hasattr(entry, 'callback'):
+            entry.callback = _event_view(entry.callback, require_plugin=plugin,
+                                         require_live=getattr(entry, '_require_live', True))
+    return urllist