Notify parent

src/pretix/control/templates/pretixcontrol/notify_parent.html

@@ -0,0 +1,11 @@
+{% extends "error.html" %}
+{% load i18n %}
+{% load eventurl %}
+{% load urlreplace %}
+{% load static %}
+
+{% block content %}
+    <h1>{% trans "Please wait..." %}</h1>
+    {{ notify_info|json_script:"notify_info" }}
+    <script type="text/javascript" src="{% static "pretixcontrol/js/notify_parent.js" %}"></script>
+{% endblock %}

src/pretix/control/views/__init__.py

@@ -22,9 +22,12 @@
 import collections.abc
 import warnings
 
+from django.contrib import messages
 from django.core.paginator import (
     EmptyPage, PageNotAnInteger, UnorderedObjectListWarning,
 )
+from django.http.response import HttpResponseRedirect
+from django.shortcuts import render
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import edit
 
@@ -38,7 +41,21 @@ class EventBasedFormMixin:
         return kwargs
 
 
-class CreateView(EventBasedFormMixin, edit.CreateView):
+class TellParentFormMixin:
+
+    def form_valid(self, form):
+        result = super().form_valid(form)
+        if self.request.GET.get('notify_parent') and isinstance(result, HttpResponseRedirect):
+            message_store = messages.get_messages(self.request)
+            msgs = [{'level': msg.level_tag, 'message': msg.message} for msg in message_store]
+            return render(self.request, 'pretixcontrol/notify_parent.html', {
+                'notify_info': {'object': self.object.pk, 'object_str': str(self.object), 'redirect_url': result.url, 'messages': msgs},
+            })
+        else:
+            return result
+
+
+class CreateView(EventBasedFormMixin, TellParentFormMixin, edit.CreateView):
     """
     Like Django's default CreateView, but passes the optional event
     argument to the form. This is necessary for I18nModelForms to work
@@ -47,7 +64,7 @@ class CreateView(EventBasedFormMixin, edit.CreateView):
     pass
 
 
-class UpdateView(EventBasedFormMixin, edit.UpdateView):
+class UpdateView(EventBasedFormMixin, TellParentFormMixin, edit.UpdateView):
     """
     Like Django's default UpdateView, but passes the optional event
     argument to the form. This is necessary for I18nModelForms to work

src/pretix/static/pretixcontrol/js/notify_parent.js

@@ -0,0 +1,8 @@
+try {
+	window.parent.postMessage({
+		type: 'pretix:notify-parent',
+		data: JSON.parse(document.getElementById('notify_info').textContent),
+	}, location.origin)
+} catch (e) {
+	console.error('Could not post message to parent.', e)
+}