# -*- coding: utf-8 -*-
# keyring_helpers.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
Keyring helpers.
"""
import logging

import keyring

from keyring.backends.file import EncryptedKeyring, PlaintextKeyring

logger = logging.getLogger(__name__)


OBSOLETE_KEYRINGS = [
    EncryptedKeyring,
    PlaintextKeyring
]


def has_keyring():
    """
    Returns whether we have an useful keyring to use.

    :rtype: bool
    """
    kr = keyring.get_keyring()
    klass = kr.__class__
    logger.debug("Selected keyring: %s" % (klass,))

    canuse = kr is not None and klass not in OBSOLETE_KEYRINGS
    if not canuse:
        logger.debug("Not using this keyring since it is obsolete")
    return canuse