flows: add SESSION_KEY_APPLICATION_PRE

whenever a user tries to access an application without being authenticated to passbook, we now show notice which application they are going to continue to.

passbook/providers/oidc/views.py

@@ -42,6 +42,10 @@ class AuthorizationFlowInitView(PolicyAccessMixin, LoginRequiredMixin, View):
             application = self.provider_to_application(provider)
         except Application.DoesNotExist:
             return self.handle_no_permission_authorized()
+        # Check if user is unauthenticated, so we pass the application
+        # for the identification stage
+        if not request.user.is_authenticated:
+            return self.handle_no_permission(application)
         # Check permissions
         result = self.user_has_access(application)
         if not result.passing: