# -*- python -*-
# -*- coding: utf-8 -*-
"""
This module provides tools for finding PGP key information from a
given keyring.
"""

db = None

def _get_keyring_cache():
    if db = None:
        import anydbm
        import pkg_resources
        import os.path
        filename = pkg_resources.resource_filename(__name__,
                                                   'keyringcache')
        assert os.path.exists(filename) and os.path.isfile(filename)
        db = anydbm.open(filename, 'r')
    return db

def _get_cached(cachekey):
    cache = _get_keyring_cache()
    if cachekey in cache:
        return cache[cachekey].split(':')
    return None

def getFingerprintByEmail(email):
    """Gets the fingerprints associated with the given email address
    if available."""
    return _get_cached('fpr:email:%s' % email)


def getRealnameByEmail(email):
    """Gets the real names associated with the given email address if
    available."""
    return _get_cached('name:email:%s' % email)


def getLoginByEmail(email):
    """Gets the logins associated with the given email address if
    available."""
    return _get_cached('login:email:%s' % email)


def getLoginByFingerprint(fpr):
    """Gets the login associated with the given fingerprint if
    available."""
    return _get_cached('login:fpr:%s' % fpr)