# Copyright 2015, Tresys Technology, LLC # # SPDX-License-Identifier: LGPL-2.1-only # from typing import NamedTuple, Set from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper class ModifiedCommon(NamedTuple): """Difference details for a modified common permission set.""" added_perms: Set[str] removed_perms: Set[str] matched_perms: Set[str] class CommonDifference(Difference): """ Determine the difference in common permission sets between two policies. """ added_commons = DiffResultDescriptor("diff_commons") removed_commons = DiffResultDescriptor("diff_commons") modified_commons = DiffResultDescriptor("diff_commons") def diff_commons(self) -> None: """Generate the difference in commons between the policies.""" self.log.info( "Generating common differences from {0.left_policy} to {0.right_policy}".format(self)) self.added_commons, self.removed_commons, matched_commons = self._set_diff( (SymbolWrapper(c) for c in self.left_policy.commons()), (SymbolWrapper(c) for c in self.right_policy.commons())) self.modified_commons = dict() for left_common, right_common in matched_commons: # Criteria for modified commons # 1. change to permissions added_perms, removed_perms, matched_perms = self._set_diff(left_common.perms, right_common.perms, unwrap=False) if added_perms or removed_perms: self.modified_commons[left_common] = ModifiedCommon(added_perms, removed_perms, matched_perms) # # Internal functions # def _reset_diff(self) -> None: """Reset diff results on policy changes.""" self.log.debug("Resetting common differences") self.added_commons = None self.removed_commons = None self.modified_commons = None