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# Copyright (c) 20092011, Eucalyptus Systems, Inc.
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# Author: Neil Soman neil@eucalyptus.com
#         Mitch Garnaat mgarnaat@eucalyptus.com

import euca2ools.commands.eucacommand
import euca2ools.bundler
import sys
from boto.roboto.param import Param

class GetPassword(euca2ools.commands.eucacommand.EucaCommand):

    Description = """Retrieves decrypts the administrator password
    for a Windows instance."""
    Options = [Param(name='privatekey',
                     short_name='k', long_name='priv-launch-key',
                     ptype='file', optional=False,
                     doc="""The file that contains the private key
                     used to launch the instance.""")]
    Args = [Param(name='instance_id', ptype='string', optional=False,
                     doc='unique identifier for the Windows instance')]

    def main(self):
        conn = self.make_connection_cli()
        try:
            pd = self.make_request_cli(conn, 'get_password_data',
                                       instance_id=self.instance_id)
        except AttributeError:
            # The reply didn't contain a passwordData element.  Boto doesn't
            # handle this since EC2 always includes one, even if it is empty.
            return None
        if pd:
            # TODO - this is actually in the bundler
            # TODO validate file?
            return euca2ools.bundler.Bundler(self).decrypt_string(
                    pd, self.privatekey, encoded=True)
        else:
            return None

    def main_cli(self):
        pw = self.main()
        if pw:
            print pw
        else:
            sys.exit('no password found for this instance')
