{
    "detail": "Authentication credentials were not provided."
}

REST_FRAMEWORK = {
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    ),
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.SessionAuthentication',
        'rest_framework.authentication.BasicAuthentication',
    ),
}

JWT_AUTH = {
    'JWT_ALLOW_REFRESH': True,
    'JWT_EXPIRATION_DELTA': datetime.timedelta(hours=1),
    'JWT_REFRESH_EXPIRATION_DELTA': datetime.timedelta(days=7),
}

def post(self, request, format=None):

    if not request.data:
        return Response({'Error': "Please provide username/password"},  status=status.HTTP_400_BAD_REQUEST)

    username = request.data['username']
    password = request.data['password']

    try:
        user = User.objects.get(email=username, password=password)
    except User.DoesNotExist:
        return Response({'Error': "Invalid username/password"}, status=status.HTTP_400_BAD_REQUEST)

    if user:
        payload = {
            'id': user.id,
            'email': user.email,
            'first_name': user.first_name
        }

        jwt_token = jwt.encode(payload, "SECRET_KEY")  # to be changed

        return Response({'token': jwt_token}, status=status.HTTP_200_OK)

authentication_class = (JSONWebTokenAuthentication,)
 permission_classes = (IsAuthenticated,)