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# Copyright 2016, Tresys Technology, LLC
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools. If not, see
# <http://www.gnu.org/licenses/>.
#
from collections import namedtuple
from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper
modified_typeattr_record = namedtuple("modified_typeattr", ["added_types",
"removed_types",
"matched_types"])
class TypeAttributesDifference(Difference):
"""Determine the difference in type attributes between two policies."""
added_type_attributes = DiffResultDescriptor("diff_type_attributes")
removed_type_attributes = DiffResultDescriptor("diff_type_attributes")
modified_type_attributes = DiffResultDescriptor("diff_type_attributes")
def diff_type_attributes(self):
"""Generate the difference in type attributes between the policies."""
self.log.info(
"Generating type attribute differences from {0.left_policy} to {0.right_policy}".
format(self))
self.added_type_attributes, self.removed_type_attributes, matched_attributes = \
self._set_diff(
(SymbolWrapper(r) for r in self.left_policy.typeattributes()),
(SymbolWrapper(r) for r in self.right_policy.typeattributes()))
self.modified_type_attributes = dict()
for left_attribute, right_attribute in matched_attributes:
# Criteria for modified attributes
# 1. change to type set
added_types, removed_types, matched_types = self._set_diff(
(SymbolWrapper(t) for t in left_attribute.expand()),
(SymbolWrapper(t) for t in right_attribute.expand()))
if added_types or removed_types:
self.modified_type_attributes[left_attribute] = modified_typeattr_record(
added_types, removed_types, matched_types)
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting type attribute differences")
self.added_type_attributes = None
self.removed_type_attributes = None
self.modified_type_attributes = None
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