# -*- coding: utf-8 -*-
"""The credentials interface."""
[docs]
class Credentials(object):
"""Credentials interface."""
[docs]
def __init__(self):
"""Initializes credentials.
Raises:
ValueError: if a derived credentials class does not define a type
indicator.
"""
super(Credentials, self).__init__()
if not getattr(self, 'TYPE_INDICATOR', None):
raise ValueError('Missing type indicator.')
@property
def type_indicator(self):
"""str: type indicator."""
# pylint: disable=no-member
return self.TYPE_INDICATOR