53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2013 The Plaso Project Authors.
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# Please see the AUTHORS file for details on individual authors.
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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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"""This file contains a method to expand Windows environment variables."""
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import re
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# TODO: Remove this file once we have a better replacement for it, either
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# to use the artifact library or dfVFS, since this is part of both of these
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# libraries.
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# Taken from: https://code.google.com/p/grr/source/browse/lib/artifact_lib.py
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def ExpandWindowsEnvironmentVariables(data_string, pre_obj):
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"""Take a string and expand any windows environment variables.
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Args:
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data_string: A string, e.g. "%SystemRoot%\\LogFiles"
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pre_obj: A pre-process object.
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Returns:
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A string with available environment variables expanded.
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"""
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win_environ_regex = re.compile(r'%([^%]+?)%')
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components = []
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offset = 0
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for match in win_environ_regex.finditer(data_string):
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components.append(data_string[offset:match.start()])
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kb_value = getattr(
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pre_obj, match.group(1).lower(), None)
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if isinstance(kb_value, basestring) and kb_value:
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components.append(kb_value)
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else:
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components.append(u'%%{0:s}%%'.format(match.group(1)))
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offset = match.end()
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components.append(data_string[offset:]) # Append the final chunk.
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return u''.join(components)
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