Integrate django-scopes (#1319)

* Install django-scopes

* Fix tests.api

* Update tasks and cronjobs

* Fix remaining tests

* Remove unused import

* Fix tests after rebase

* Disable scopes for get_Events_with_any_permission

* Disable scopes for a management command

src/pretix/presale/middleware.py

@@ -1,25 +1,32 @@
 from django.urls import resolve
-from django.utils.deprecation import MiddlewareMixin
+from django_scopes import scope
 
 from pretix.presale.signals import process_response
 
 from .utils import _detect_event
 
 
-class EventMiddleware(MiddlewareMixin):
-    def process_request(self, request):
+class EventMiddleware:
+    def __init__(self, get_response=None):
+        self.get_response = get_response
+        super().__init__()
+
+    def __call__(self, request):
         url = resolve(request.path_info)
         request._namespace = url.namespace
         if url.namespace != 'presale':
-            return
+            return self.get_response(request)
 
         if 'organizer' in url.kwargs or 'event' in url.kwargs:
             redirect = _detect_event(request, require_live=url.url_name != 'event.widget.productlist')
             if redirect:
                 return redirect
 
-    def process_response(self, request, response):
-        if hasattr(request, '_namespace') and request._namespace == 'presale' and hasattr(request, 'event'):
-            for receiver, r in process_response.send(request.event, request=request, response=response):
-                response = r
+        with scope(organizer=getattr(request, 'organizer', None)):
+            response = self.get_response(request)
+
+            if hasattr(request, '_namespace') and request._namespace == 'presale' and hasattr(request, 'event'):
+                for receiver, r in process_response.send(request.event, request=request, response=response):
+                    response = r
+
         return response