misc: make OIDCUser.is_authenticated callable (#42172)

It's still necessary for DRF 3.4.0.

src/authentic2/authentication.py

@@ -17,6 +17,10 @@
 import inspect
 
 from django.utils import six
+try:
+    from django.utils.deprecation import CallableTrue
+except ImportError:
+    CallableTrue = True
 
 from authentic2_idp_oidc.models import OIDCClient
 
@@ -46,7 +50,7 @@ class OIDCUser(object):
 
     @property
     def is_authenticated(self):
-        return self.authenticated
+        return CallableTrue
 
 
 class Authentic2Authentication(BasicAuthentication):

tox.ini

@@ -79,7 +79,7 @@ deps =
   oldldap: python-ldap<3
   py2: django-appconf<1.0.4
   py2: django-filter<2
-  drf34: djangorestframework>=3.4,<3.5
+  drf34: djangorestframework>=3.4,<3.4.1
   drf39: djangorestframework>=3.9.2,<3.10
 commands =
   py2: ./getlasso.sh
@@ -115,6 +115,7 @@ filterwarnings =
   ignore:defusedxml.lxml is no longer supported:DeprecationWarning:openpyxl.xml.functions
   ignore:Using or importing the ABCs from 'collections':DeprecationWarning:django.*
   ignore:Role QuerySet won't use Meta.ordering::django\..*
+  ignore:Using user.is_authenticated\(\) and user.is_anonymous\(\) as a method is deprecated.::rest_framework\.*
 # remind us later
   once:.*staticfiles.*::django\..*
 junit_family=xunit2