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Edit: types.py
# Copyright 2015, Tresys Technology, LLC # Copyright 2018, Chris PeBenito <pebenito@ieee.org> # # SPDX-License-Identifier: LGPL-2.1-only # from collections import defaultdict from typing import NamedTuple, Set, Union from ..policyrep import Type, TypeAttribute, TypeOrAttr from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper from .typeattr import typeattr_wrapper_factory from .typing import SymbolCache _types_cache: SymbolCache[Type] = defaultdict(dict) class ModifiedType(NamedTuple): """Difference details for a modified type.""" added_attributes: Set[TypeAttribute] removed_attributes: Set[TypeAttribute] matched_attributes: Set[TypeAttribute] modified_permissive: bool permissive: bool added_aliases: Set[str] removed_aliases: Set[str] matched_aliases: Set[str] def type_wrapper_factory(type_: Type) -> SymbolWrapper[Type]: """ Wrap types from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ try: return _types_cache[type_.policy][type_] except KeyError: t = SymbolWrapper(type_) _types_cache[type_.policy][type_] = t return t def type_or_attr_wrapper_factory(type_: TypeOrAttr) -> \ Union[SymbolWrapper[Type], SymbolWrapper[TypeAttribute]]: """ Wrap types or attributes from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ if isinstance(type_, Type): return type_wrapper_factory(type_) else: return typeattr_wrapper_factory(type_) class TypesDifference(Difference): """Determine the difference in types between two policies.""" added_types = DiffResultDescriptor("diff_types") removed_types = DiffResultDescriptor("diff_types") modified_types = DiffResultDescriptor("diff_types") def diff_types(self) -> None: """Generate the difference in types between the policies.""" self.log.info( "Generating type differences from {0.left_policy} to {0.right_policy}".format(self)) self.added_types, self.removed_types, matched_types = self._set_diff( (SymbolWrapper(t) for t in self.left_policy.types()), (SymbolWrapper(t) for t in self.right_policy.types())) self.modified_types = dict() for left_type, right_type in matched_types: # Criteria for modified types # 1. change to attribute set, or # 2. change to alias set, or # 3. different permissive setting added_attr, removed_attr, matched_attr = self._set_diff( (SymbolWrapper(a) for a in left_type.attributes()), (SymbolWrapper(a) for a in right_type.attributes())) added_aliases, removed_aliases, matched_aliases = self._set_diff(left_type.aliases(), right_type.aliases(), unwrap=False) left_permissive = left_type.ispermissive right_permissive = right_type.ispermissive mod_permissive = left_permissive != right_permissive if added_attr or removed_attr or added_aliases or removed_aliases or mod_permissive: self.modified_types[left_type] = ModifiedType(added_attr, removed_attr, matched_attr, mod_permissive, left_permissive, added_aliases, removed_aliases, matched_aliases) # # Internal functions # def _reset_diff(self) -> None: """Reset diff results on policy changes.""" self.log.debug("Resetting type differences") self.added_types = None self.removed_types = None self.modified_types = None