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/usr/lib/python2.7/dist-packages/tryton/fingerprints.py is in tryton-client 3.4.0-1.

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#This file is part of Tryton.  The COPYRIGHT file at the top level of
#this repository contains the full copyright notices and license terms.
import os
from tryton.config import get_config_dir

KNOWN_HOSTS_PATH = os.path.join(get_config_dir(), 'known_hosts')


class Fingerprints(dict):

    def __init__(self):
        super(Fingerprints, self).__init__()
        self.load()

    def load(self):
        if not os.path.isfile(KNOWN_HOSTS_PATH):
            return
        with open(KNOWN_HOSTS_PATH) as known_hosts:
            for line in known_hosts:
                line = line.strip()
                try:
                    host, sha1 = line.split(' ')
                except ValueError:
                    host, sha1 = line, ''
                self[host] = sha1

    def save(self):
        with open(KNOWN_HOSTS_PATH, 'w') as known_hosts:
            known_hosts.writelines('%s %s' % (host, sha1)
                    + os.linesep for host, sha1 in self.iteritems())

    def __setitem__(self, key, value):
        assert isinstance(key, basestring)
        if value:
            assert len(value) == 59  # len of formated sha1
        else:
            value = ''
        super(Fingerprints, self).__setitem__(key, value)
        self.save()