Refactor to extend RemoteUserMiddleware & add authentication for Django

src/paperless/auth.py

@@ -2,7 +2,7 @@ from django.conf import settings
 from django.contrib.auth.models import User
 from django.utils.deprecation import MiddlewareMixin
 from rest_framework import authentication
-from rest_framework import exceptions
+from django.contrib.auth.middleware import RemoteUserMiddleware
 
 
 class AutoLoginMiddleware(MiddlewareMixin):
@@ -29,19 +29,9 @@ class AngularApiAuthenticationOverride(authentication.BaseAuthentication):
             return None
 
 
-class HttpRemoteUserAuthentication(authentication.BaseAuthentication):
+class HttpRemoteUserMiddleware(RemoteUserMiddleware):
     """ This class allows authentication via HTTP_REMOTE_USER which is set for
         example by certain SSO applications.
     """
 
-    def authenticate(self, request):
-        username = request.META.get('HTTP_REMOTE_USER')
-        if not username:
-            return None
-
-        try:
-            user = User.objects.get(username=username)
-        except User.DoesNotExist:
-            raise exceptions.AuthenticationFailed('No such user')
-
-        return (user, None)
+    header = 'HTTP_REMOTE_USER'