Fix #277 -- Embeddable shop (#622)

* Vendor vue.js

* Refactor item_group_by_category to support vouchers

* Widget: Show product list

* Widget: free prices

* Widget: pictures and loading indicator

* Widget: First iframe steps

* Widget: Do not rerender iframe

* Widget: Error handling

* Improve widget

* Widget: localization tech

* Fix invoice style

* Voucher attribute and waiting list

* Add some iframe chrome

* First step to namespaced carts

* More isolation steps

* More cart isolation things

* More cart isolation things

* Mobile stuff

* Show cart on checkout pages

* PayPal and Stripe support

* Enable downloads

* Locale handling

* change text "save URL to this exact page"

* Widget: voucher redemption

* Widget: CSS

* CSS: Responsive

* Widget: CSS improvements

* Widget: Add embedding code generator

* Widget: Error messages and SSL check

* First tests

* Widget: tests

* Don't use IDs in widgets

* Widget: static files caching

src/pretix/control/views/event.py

@@ -1,6 +1,7 @@
 import re
 from collections import OrderedDict
 from datetime import timedelta
+from urllib.parse import urlsplit
 
 from django.conf import settings
 from django.contrib import messages
@@ -36,10 +37,12 @@ from pretix.control.forms.event import (
     CommentForm, DisplaySettingsForm, EventMetaValueForm, EventSettingsForm,
     EventUpdateForm, InvoiceSettingsForm, MailSettingsForm,
     PaymentSettingsForm, ProviderForm, TaxRuleForm, TicketSettingsForm,
+    WidgetCodeForm,
 )
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.control.signals import nav_event_settings
 from pretix.helpers.urls import build_absolute_uri
+from pretix.multidomain.urlreverse import get_domain
 from pretix.presale.style import regenerate_css
 
 from . import CreateView, UpdateView
@@ -989,3 +992,31 @@ class TaxDelete(EventSettingsViewMixin, EventPermissionRequiredMixin, DeleteView
         context = super().get_context_data(*args, **kwargs)
         context['possible'] = self.object.allow_delete()
         return context
+
+
+class WidgetSettings(EventSettingsViewMixin, EventPermissionRequiredMixin, FormView):
+    template_name = 'pretixcontrol/event/widget.html'
+    permission = 'can_change_event_settings'
+    form_class = WidgetCodeForm
+
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs['event'] = self.request.event
+        return kwargs
+
+    def form_valid(self, form):
+        ctx = self.get_context_data()
+        ctx['form'] = form
+        ctx['valid'] = True
+        return self.render_to_response(ctx)
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+        ctx['urlprefix'] = settings.SITE_URL
+        domain = get_domain(self.request.organizer)
+        if domain:
+            siteurlsplit = urlsplit(settings.SITE_URL)
+            if siteurlsplit.port and siteurlsplit.port not in (80, 443):
+                domain = '%s:%d' % (domain, siteurlsplit.port)
+            ctx['urlprefix'] = '%s://%s' % (siteurlsplit.scheme, domain)
+        return ctx