How to use the stix2.base._Extension function in stix2

def __init__(self, **kwargs):
            _Extension.__init__(self, **kwargs)
            _cls_init(cls, self, kwargs)

class WindowsPESection(_STIXBase):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _properties = OrderedDict([
        ('name', StringProperty(required=True)),
        ('size', IntegerProperty(min=0)),
        ('entropy', FloatProperty()),
        ('hashes', HashesProperty(spec_version='2.1')),
    ])


class WindowsPEBinaryExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'windows-pebinary-ext'
    _properties = OrderedDict([
        ('pe_type', StringProperty(required=True)),  # open_vocab
        ('imphash', StringProperty()),
        ('machine_hex', HexProperty()),
        ('number_of_sections', IntegerProperty(min=0)),
        ('time_date_stamp', TimestampProperty(precision='second')),
        ('pointer_to_symbol_table_hex', HexProperty()),
        ('number_of_symbols', IntegerProperty(min=0)),
        ('size_of_optional_header', IntegerProperty(min=0)),
        ('characteristics_hex', HexProperty()),

def _custom_extension_builder(cls, observable, type, properties, version):
    if not observable or not issubclass(observable, _Observable):
        raise ValueError("'observable' must be a valid Observable class!")

    class _CustomExtension(cls, _Extension):

        if not re.match(TYPE_REGEX, type):
            raise ValueError(
                "Invalid extension type name '%s': must only contain the "
                "characters a-z (lowercase ASCII), 0-9, and hyphen (-)." % type,
            )
        elif len(type) < 3 or len(type) > 250:
            raise ValueError("Invalid extension type name '%s': must be between 3 and 250 characters." % type)

        if not properties or not isinstance(properties, list):
            raise ValueError("Must supply a list, containing tuples. For example, [('property1', IntegerProperty())]")

        _type = type
        _properties = OrderedDict(properties)

        def __init__(self, **kwargs):

_type = 'mutex'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('name', StringProperty(required=True)),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),
    ])
    _id_contributing_properties = ["name"]


class HTTPRequestExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'http-request-ext'
    _properties = OrderedDict([
        ('request_method', StringProperty(required=True)),
        ('request_value', StringProperty(required=True)),
        ('request_version', StringProperty()),
        ('request_header', DictionaryProperty(spec_version='2.1')),
        ('message_body_length', IntegerProperty()),
        ('message_body_data_ref', ObjectReferenceProperty(valid_types='artifact')),
    ])

class NTFSExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'ntfs-ext'
    _properties = OrderedDict([
        ('sid', StringProperty()),
        ('alternate_data_streams', ListProperty(EmbeddedObjectProperty(type=AlternateDataStream))),
    ])


class PDFExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'pdf-ext'
    _properties = OrderedDict([
        ('version', StringProperty()),
        ('is_optimized', BooleanProperty()),
        ('document_info_dict', DictionaryProperty(spec_version='2.1')),
        ('pdfid0', StringProperty()),
        ('pdfid1', StringProperty()),
    ])


class RasterImageExt(_Extension):

def _check_object_constraints(self):
        super(SocketExt, self)._check_object_constraints()

        options = self.get('options')

        if options is not None:
            acceptable_prefixes = ["SO", "ICMP", "ICMP6", "IP", "IPV6", "MCAST", "TCP", "IRLMP"]
            for key, val in options.items():
                if key[:key.find('_')] not in acceptable_prefixes:
                    raise ValueError("Incorrect options key")
                if not isinstance(val, int):
                    raise ValueError("Options value must be an integer")


class TCPExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'tcp-ext'
    _properties = OrderedDict([
        ('src_flags_hex', HexProperty()),
        ('dst_flags_hex', HexProperty()),
    ])


class NetworkTraffic(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.

('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),
    ])
    _id_contributing_properties = ["from_ref", "subject", "body"]

    def _check_object_constraints(self):
        super(EmailMessage, self)._check_object_constraints()
        self._check_properties_dependency(['is_multipart'], ['body_multipart'])
        if self.get('is_multipart') is True and self.get('body'):
            # 'body' MAY only be used if is_multipart is false.
            raise DependentPropertiesError(self.__class__, [('is_multipart', 'body')])


class ArchiveExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'archive-ext'
    _properties = OrderedDict([
        ('contains_refs', ListProperty(ObjectReferenceProperty(valid_types=['file', 'directory']), required=True)),
        ('comment', StringProperty()),
    ])


class AlternateDataStream(_STIXBase):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.

# TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'pdf-ext'
    _properties = OrderedDict([
        ('version', StringProperty()),
        ('is_optimized', BooleanProperty()),
        ('document_info_dict', DictionaryProperty(spec_version='2.1')),
        ('pdfid0', StringProperty()),
        ('pdfid1', StringProperty()),
    ])


class RasterImageExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'raster-image-ext'
    _properties = OrderedDict([
        ('image_height', IntegerProperty()),
        ('image_width', IntegerProperty()),
        ('bits_per_pixel', IntegerProperty()),
        ('exif_tags', DictionaryProperty(spec_version='2.1')),
    ])


class WindowsPEOptionalHeaderType(_STIXBase):
    # TODO: Add link

('priority', StringProperty()),
        ('owner_sid', StringProperty()),
        ('window_title', StringProperty()),
        ('startup_info', DictionaryProperty(spec_version='2.1')),
        (
            'integrity_level', EnumProperty(allowed=[
                "low",
                "medium",
                "high",
                "system",
            ]),
        ),
    ])


class WindowsServiceExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'windows-service-ext'
    _properties = OrderedDict([
        ('service_name', StringProperty()),
        ('descriptions', ListProperty(StringProperty)),
        ('display_name', StringProperty()),
        ('group_name', StringProperty()),
        (
            'start_type', EnumProperty(allowed=[
                "SERVICE_AUTO_START",
                "SERVICE_BOOT_START",
                "SERVICE_DEMAND_START",

"""For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'http-request-ext'
    _properties = OrderedDict([
        ('request_method', StringProperty(required=True)),
        ('request_value', StringProperty(required=True)),
        ('request_version', StringProperty()),
        ('request_header', DictionaryProperty(spec_version='2.1')),
        ('message_body_length', IntegerProperty()),
        ('message_body_data_ref', ObjectReferenceProperty(valid_types='artifact')),
    ])


class ICMPExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'icmp-ext'
    _properties = OrderedDict([
        ('icmp_type_hex', HexProperty(required=True)),
        ('icmp_code_hex', HexProperty(required=True)),
    ])


class SocketExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.