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/presale/context.py

@@ -56,6 +56,9 @@ def contextprocessor(request):
         ctx['event'] = request.event
         ctx['languages'] = [get_language_info(code) for code in request.event.settings.locales]
 
+        if request.resolver_match:
+            ctx['cart_namespace'] = request.resolver_match.kwargs.get('cart_namespace', '')
+
     if hasattr(request, 'organizer'):
         if request.organizer.settings.presale_css_file and not hasattr(request, 'event'):
             ctx['css_file'] = default_storage.url(request.organizer.settings.presale_css_file)