95 lines
2.8 KiB
Python
95 lines
2.8 KiB
Python
# -*- coding: utf-8 -*- #
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# Copyright 2018 Google LLC. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helpers for parsing Binary Authorization resource files."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import unicode_literals
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import json
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import os
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import enum
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from googlecloudsdk.command_lib.container.binauthz import exceptions
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from googlecloudsdk.core import yaml
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from googlecloudsdk.core.util import files
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import six
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class ResourceFileReadError(exceptions.Error):
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"""Indicates a resource file could not be read."""
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class ResourceFileTypeError(exceptions.Error):
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"""Indicates a resource file was of an unsupported type."""
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class ResourceFileParseError(exceptions.Error):
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"""Indicates a resource file could not be parsed."""
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class ResourceFileType(enum.Enum):
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UNKNOWN = 0
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JSON = 1
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YAML = 2
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def GetResourceFileType(file_name):
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_, ext = os.path.splitext(file_name)
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if ext == '.json':
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return ResourceFileType.JSON
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elif ext in ('.yaml', '.yml'):
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return ResourceFileType.YAML
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else:
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return ResourceFileType.UNKNOWN
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def LoadResourceFile(input_fname):
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"""Load an input resource file in either JSON or YAML format.
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Args:
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input_fname: The name of the file to convert to parse.
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Returns:
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The Python object resulting from the decode.
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Raises:
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ResourceFileReadError: An error occurred attempting to read the input file.
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ResourceFileTypeError: The input file was an unsupported type.
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ResourceFileParseError: A parse error occurred.
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"""
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try:
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input_text = files.ReadFileContents(input_fname)
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except files.Error as e:
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raise ResourceFileReadError(six.text_type(e))
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file_type = GetResourceFileType(input_fname)
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if file_type == ResourceFileType.JSON:
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try:
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return json.loads(input_text)
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except ValueError as e:
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raise ResourceFileParseError('Error in resource file JSON: ' +
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six.text_type(e))
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elif file_type == ResourceFileType.YAML:
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try:
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return yaml.load(input_text)
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except yaml.YAMLParseError as e:
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raise ResourceFileParseError('Error in resource file YAML: ' +
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six.text_type(e))
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else: # file_type == ResourceFileType.UNKNOWN
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raise ResourceFileTypeError(
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'Input file [{}] not of type YAML or JSON'.format(input_fname))
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