@classmethod
def restore_padding(cls, token):
    """Restore padding based on token size.

        :param token: token to restore padding on
        :type token: six.text_type
        :returns: token with correct padding

        """
    mod_returned = len(token) % 4
    if mod_returned:
        missing_padding = 4 - mod_returned
        token += '=' * missing_padding
    return token
