How can I get the Authentication class (or class name) which is succeeded during authentication in DRF View?

Question

Suppose I have a view as

from rest_framework import viewsets


class SampleViewset(viewsets.ModelViewSet):
    serializer_class = SampleSerializer
    queryset = Sample.objects.all()
    authentication_classes = (FirstAuthClass, SecondAuthClass, ThirdAuthClass)

    def get_success_auth_class(self, request, *args, **kwargs):
        # What logic should I use here ????
        return success_auth_class

Then, What logic should I use in get_success_auth_class() method?

In other words, How can I get the Authentication class (or class name) which is succeeded during authentication in DRF View?

Answer 1

The DRF Request class has a property called successful_authenticator which will return the instance of the authentication instance class that was used to authenticate the request, or None .

class SampleViewset(viewsets.ModelViewSet):
    serializer_class = SampleSerializer
    queryset = Sample.objects.all()
    

    def get_success_auth_class(self, request, *args, **kwargs):
        for auth_class in self.authentication_classes:
            if isinstance(, auth_class):
                return auth_class
        return None

Quoting the source code here

 @property def successful_authenticator(self): """ Return the instance of the authentication instance class that was used to authenticate the request, or `None`. """ if not hasattr(self, '_authenticator'): with wrap_attributeerrors(): self._authenticate() return self._authenticator 

Reference :

Github source code