DRF custom authentication class for access key based auth checking.

authentication.py

from rest_framework import authentication
from rest_framework import exceptions
from apps.newspaper.models import Subscriber


class AccessKeyAuthentication(authentication.BaseAuthentication):

    def authenticate(self, request):
    	access_key = request.GET.get("access_key", None)
	if not access_key:
	    raise exceptions.NotFound("Access key not provided.")
	try:
	    user = Subscriber.objects.get(access_key=access_key)
	except Subscriber.DoesNotExist:
	    raise exceptions.PermissionDenied("No User found with the access key")
        except ValueError:
            raise exceptions.ValidationError("Badly formed hexadecimal UUID string")

	return (user, None)