policy(major): simplify PolicyEngine API, add flag to ignore cache for debug purposes

passbook/core/views/access.py

@@ -31,6 +31,6 @@ class AccessMixin:
     def user_has_access(self, application: Application, user: User) -> Tuple[bool, List[str]]:
         """Check if user has access to application."""
         LOGGER.debug("Checking permissions", user=user, application=application)
-        policy_engine = PolicyEngine(application.policies.all())
-        policy_engine.for_user(user).with_request(self.request).build()
+        policy_engine = PolicyEngine(application.policies.all(), user, self.request)
+        policy_engine.build()
         return policy_engine.result

passbook/core/views/overview.py

@@ -16,8 +16,7 @@ class OverviewView(LoginRequiredMixin, TemplateView):
     def get_context_data(self, **kwargs):
         kwargs['applications'] = []
         for application in Application.objects.all():
-            engine = PolicyEngine(application.policies.all())
-            engine.for_user(self.request.user).with_request(self.request)
+            engine = PolicyEngine(application.policies.all(), self.request.user, self.request)
             engine.build()
             if engine.passing:
                 kwargs['applications'].append(application)