WWW-Authenticate responses

1 files changed, 20 insertions, 1 deletions

diff --git a/rest_framework/views.py b/rest_framework/views.py
index fdb373da..ac9b3385 100644
--- a/rest_framework/views.py
+++ b/rest_framework/views.py
@@ -148,7 +148,7 @@ class APIView(View):
         """
         If request is not permitted, determine what kind of exception to raise.
         """
-        if self.request.successful_authenticator:
+        if not self.request.successful_authenticator:
             raise exceptions.NotAuthenticated()
         raise exceptions.PermissionDenied()
 
@@ -158,6 +158,15 @@ class APIView(View):
         """
         raise exceptions.Throttled(wait)
 
+    def get_authenticate_header(self, request):
+        """
+        If a request is unauthenticated, determine the WWW-Authenticate
+        header to use for 401 responses, if any.
+        """
+        authenticators = self.get_authenticators()
+        if authenticators:
+            return authenticators[0].authenticate_header(request)
+
     def get_parser_context(self, http_request):
         """
         Returns a dict that is passed through to Parser.parse(),
@@ -321,6 +330,16 @@ class APIView(View):
             # Throttle wait header
             self.headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait
 
+        if isinstance(exc, (exceptions.NotAuthenticated,
+                            exceptions.AuthenticationFailed)):
+            # WWW-Authenticate header for 401 responses, else coerce to 403
+            auth_header = self.get_authenticate_header(self.request)
+
+            if auth_header:
+                self.headers['WWW-Authenticate'] = auth_header
+            else:
+                exc.status_code = status.HTTP_403_FORBIDDEN
+
         if isinstance(exc, exceptions.APIException):
             return Response({'detail': exc.detail},
                             status=exc.status_code,