# Copyright 2015, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import logging
from typing import Iterable
from .descriptors import CriteriaDescriptor
from .mixins import MatchAlias, MatchName
from .policyrep import Sensitivity
from .query import PolicyQuery
from .util import match_level
class SensitivityQuery(MatchAlias, MatchName, PolicyQuery):
"""
Query MLS Sensitivities
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
name The name of the category to match.
name_regex If true, regular expression matching will
be used for matching the name.
alias The alias name to match.
alias_regex If true, regular expression matching
will be used on the alias names.
sens The criteria to match the sensitivity by dominance.
sens_dom If true, the criteria will match if it dominates
the sensitivity.
sens_domby If true, the criteria will match if it is dominated
by the sensitivity.
"""
sens = CriteriaDescriptor(lookup_function="lookup_sensitivity")
sens_dom: bool = False
sens_domby: bool = False
def __init__(self, policy, **kwargs) -> None:
super(SensitivityQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self) -> Iterable[Sensitivity]:
"""Generator which yields all matching sensitivities."""
self.log.info("Generating sensitivity results from {0.policy}".format(self))
self._match_name_debug(self.log)
self._match_alias_debug(self.log)
self.log.debug("Sens: {0.sens!r}, dom: {0.sens_dom}, domby: {0.sens_domby}".format(self))
for s in self.policy.sensitivities():
if not self._match_name(s):
continue
if not self._match_alias(s):
continue
if self.sens:
if self.sens_dom:
if self.sens < s:
continue
elif self.sens_domby:
if self.sens > s:
continue
elif self.sens != s:
continue
yield s
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