Point Django to NAV's Account model for users

This changes NAV's Account model to inherit from Django's
AbstractBaseUser in order to move towards more compatibility
with Django libraries for authentication and authorization.

Author: lunkwill42

python/nav/django/settings.py

@@ -230,6 +230,7 @@
 )
 
 DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
+AUTH_USER_MODEL = "nav.models.Account"
 
 REST_FRAMEWORK = {
     'DEFAULT_FILTER_BACKENDS': ('django_filters.rest_framework.DjangoFilterBackend',),

python/nav/models/profiles.py

@@ -26,6 +26,7 @@
 import re
 import json
 
+from django.contrib.auth.base_user import AbstractBaseUser
 from django.contrib.postgres.fields import HStoreField
 from django.db import models, transaction
 from django.forms.models import model_to_dict
@@ -83,9 +84,10 @@
 ### Account models
 
 
-class Account(models.Model):
+class Account(AbstractBaseUser):
     """NAV's basic account model"""
 
+    USERNAME_FIELD = 'login'
     DEFAULT_ACCOUNT = 0
     ADMIN_ACCOUNT = 1
 
@@ -199,6 +201,14 @@ def is_admin(self):
         """Has this user administrator rights?"""
         return self.has_perm(None, None)
 
+    @property
+    def is_anonymous(self):
+        return self.id == self.DEFAULT_ACCOUNT
+
+    @property
+    def is_authenticated(self):
+        return self.id != self.DEFAULT_ACCOUNT
+
     @sensitive_variables('password')
     def set_password(self, password):
         """Sets user password. Copied from nav.db.navprofiles"""

python/nav/models/sql/changes/sc.05.14.0001.sql

@@ -0,0 +1,3 @@
+-- Add missing field required when switching to Django's AbstractBaseUser
+ALTER TABLE account
+ADD COLUMN last_login TIMESTAMP WITH TIME ZONE;