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#!/usr/bin/env python
# Copyright (C) 2020 Red Hat, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re2
def filter_allowed_disallowed(
subjects, allowed_patterns, disallowed_patterns):
"""Filter a list using allowed and disallowed patterns.
:param list subjects: A list of strings to filter.
:param allowed_patterns: A list of re2-compatible patterns to allow.
If empty, all subjects are allowed (see next).
:param disallowed_patterns: A list of re2-compatible patterns to
reject. A more-specific pattern here may override a less-specific
allowed pattern. If empty, all allowed subjects will pass.
"""
ret = []
for subject in subjects:
allowed = True
if allowed_patterns:
allowed = False
for pattern in allowed_patterns:
if re2.match(pattern, subject):
allowed = True
break
if allowed and disallowed_patterns:
for pattern in disallowed_patterns:
if re2.match(pattern, subject):
allowed = False
break
if allowed:
ret.append(subject)
return ret
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