129 lines
4.2 KiB
Python
129 lines
4.2 KiB
Python
"""STIX 2.0 Objects that are neither SDOs nor SROs."""
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from collections import OrderedDict
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import importlib
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import pkgutil
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from . import exceptions
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from .base import _STIXBase
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from .properties import IDProperty, ListProperty, Property, TypeProperty
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from .utils import get_dict
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class STIXObjectProperty(Property):
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def __init__(self, allow_custom=False):
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self.allow_custom = allow_custom
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super(STIXObjectProperty, self).__init__()
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def clean(self, value):
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try:
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dictified = get_dict(value)
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except ValueError:
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raise ValueError("This property may only contain a dictionary or object")
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if dictified == {}:
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raise ValueError("This property may only contain a non-empty dictionary or object")
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if 'type' in dictified and dictified['type'] == 'bundle':
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raise ValueError('This property may not contain a Bundle object')
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if self.allow_custom:
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parsed_obj = parse(dictified, allow_custom=True)
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else:
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parsed_obj = parse(dictified)
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return parsed_obj
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class Bundle(_STIXBase):
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_type = 'bundle'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('id', IDProperty(_type)),
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('spec_version', Property(fixed="2.0")),
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('objects', ListProperty(STIXObjectProperty)),
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])
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def __init__(self, *args, **kwargs):
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# Add any positional arguments to the 'objects' kwarg.
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if args:
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if isinstance(args[0], list):
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kwargs['objects'] = args[0] + list(args[1:]) + kwargs.get('objects', [])
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else:
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kwargs['objects'] = list(args) + kwargs.get('objects', [])
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allow_custom = kwargs.get('allow_custom', False)
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if allow_custom:
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self._properties['objects'] = ListProperty(STIXObjectProperty(True))
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super(Bundle, self).__init__(**kwargs)
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STIX2_OBJ_MAPS = {}
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def parse(data, allow_custom=False, version=None):
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"""Deserialize a string or file-like object into a STIX object.
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Args:
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data (str, dict, file-like object): The STIX 2 content to be parsed.
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allow_custom (bool): Whether to allow custom properties or not.
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Default: False.
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version (str): Which STIX2 version to use. (e.g. "2.0", "2.1"). If
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None, use latest version.
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Returns:
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An instantiated Python STIX object.
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"""
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if not version:
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# Use latest version
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OBJ_MAP = STIX2_OBJ_MAPS[sorted(STIX2_OBJ_MAPS.keys())[-1]]
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else:
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v = 'v' + version.replace('.', '')
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OBJ_MAP = STIX2_OBJ_MAPS[v]
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obj = get_dict(data)
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if 'type' not in obj:
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raise exceptions.ParseError("Can't parse object with no 'type' property: %s" % str(obj))
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try:
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obj_class = OBJ_MAP[obj['type']]
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except KeyError:
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raise exceptions.ParseError("Can't parse unknown object type '%s'! For custom types, use the CustomObject decorator." % obj['type'])
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return obj_class(allow_custom=allow_custom, **obj)
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def _register_type(new_type, version=None):
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"""Register a custom STIX Object type.
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Args:
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new_type (class): A class to register in the Object map.
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version (str): Which STIX2 version to use. (e.g. "2.0", "2.1"). If
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None, use latest version.
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"""
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if not version:
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# Use latest version
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OBJ_MAP = STIX2_OBJ_MAPS[sorted(STIX2_OBJ_MAPS.keys())[-1]]
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else:
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v = 'v' + version.replace('.', '')
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OBJ_MAP = STIX2_OBJ_MAPS[v]
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OBJ_MAP[new_type._type] = new_type
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def _collect_stix2_obj_maps():
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"""Navigate the package once and retrieve all OBJ_MAP dicts for each v2X
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package."""
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if not STIX2_OBJ_MAPS:
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top_level_module = importlib.import_module('stix2')
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path = top_level_module.__path__
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prefix = str(top_level_module.__name__) + '.'
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for module_loader, name, is_pkg in pkgutil.walk_packages(path=path,
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prefix=prefix):
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if name.startswith('stix2.v2') and is_pkg:
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mod = importlib.import_module(name, top_level_module)
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STIX2_OBJ_MAPS[name.split('.')[-1]] = mod.OBJ_MAP
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