except TypeError:

        raise SshKeyParseError(_("Incorrect SSH key - failed to decode base64 part %r") % keyvalue)

    if not decoded.startswith('\x00\x00\x00' + chr(len(keytype)) + str(keytype) + '\x00'):

        raise SshKeyParseError(_("Incorrect SSH key - base64 part is not %r as claimed but %r") % (str(keytype), str(decoded[4:].split('\0', 1)[0])))

    return keytype, decoded, comment

SSH_OPTIONS = 'no-pty,no-port-forwarding,no-X11-forwarding,no-agent-forwarding'

def authorized_keys_line(kallithea_cli_path, config_file, key):

    """

    Return a line as it would appear in .authorized_keys

    >>> from kallithea.model.db import UserSshKeys, User

    >>> user = User(user_id=7, username='uu')

    >>> key = UserSshKeys(user_ssh_key_id=17, user=user, description='test key')

    >>> key.public_key='''ssh-rsa  AAAAB3NzaC1yc2EAAAALVGhpcyBpcyBmYWtlIQ== and a comment'''

    >>> authorized_keys_line('/srv/kallithea/venv/bin/kallithea-cli', '/srv/kallithea/my.ini', key)

    'no-pty,no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command="/srv/kallithea/venv/bin/kallithea-cli ssh-serve -c /srv/kallithea/my.ini 7 17" ssh-rsa AAAAB3NzaC1yc2EAAAALVGhpcyBpcyBmYWtlIQ==\\n'

    """

    try:

    except SshKeyParseError:

        return '# Invalid Kallithea SSH key: %s %s\n' % (key.user.user_id, key.user_ssh_key_id)

    return '%s,command="%s ssh-serve -c %s %s %s" %s %s\n' % (

        SSH_OPTIONS, kallithea_cli_path, config_file,

        key.user.user_id, key.user_ssh_key_id,