from crypt import crypt
import os


def htpasswd(username, password, request):
    settings = request.registry.settings
    file = settings['biforst.auth']
    if not os.path.isfile(file):
        return None
    users = {}
    with open(file) as f:
        for line in f:
            login, pwd = line.split(':')
            users[login] = pwd.rstrip('\n')
    if username in users and crypt(password, users[username]) == users[username]:
        return [Authenticated]
    return None