/usr/lib/python3/dist-packages/dkim/util.py is in python3-dkim 0.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | # This software is provided 'as-is', without any express or implied
# warranty. In no event will the author be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
#
# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
import re
import logging
try:
from logging import NullHandler
except ImportError:
class NullHandler(logging.Handler):
def emit(self, record):
pass
__all__ = [
'DuplicateTag',
'get_default_logger',
'InvalidTagSpec',
'InvalidTagValueList',
'parse_tag_value',
]
class InvalidTagValueList(Exception):
pass
class DuplicateTag(InvalidTagValueList):
pass
class InvalidTagSpec(InvalidTagValueList):
pass
def parse_tag_value(tag_list):
"""Parse a DKIM Tag=Value list.
Interprets the syntax specified by RFC6376 section 3.2.
Assumes that folding whitespace is already unfolded.
@param tag_list: A bytes string containing a DKIM Tag=Value list.
"""
tags = {}
tag_specs = tag_list.strip().split(b';')
# Trailing semicolons are valid.
if not tag_specs[-1]:
tag_specs.pop()
for tag_spec in tag_specs:
try:
key, value = [x.strip() for x in tag_spec.split(b'=', 1)]
except ValueError:
raise InvalidTagSpec(tag_spec)
if re.match(br'^[a-zA-Z](\w)*', key) is None:
raise InvalidTagSpec(tag_spec)
if key in tags:
raise DuplicateTag(key)
tags[key] = value
return tags
def get_default_logger():
"""Get the default dkimpy logger."""
logger = logging.getLogger('dkimpy')
if not logger.handlers:
logger.addHandler(NullHandler())
return logger
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