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#!/usr/bin/env python
# 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) 2008 Greg Hewgill http://hewgill.com
#
# This has been modified from the original software.
# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
from __future__ import print_function
import sys
import argparse
import dkim
def main():
parser = argparse.ArgumentParser(
description='Verify DKIM signature for email messages.',
epilog="message to be verified follows commands on stdin")
parser.add_argument('--index', metavar='N', type=int, default=0,
help='Index of DKIM signature header to verify: default=0')
args=parser.parse_args()
if sys.version_info[0] >= 3:
# Make sys.stdin a binary stream.
sys.stdin = sys.stdin.detach()
message = sys.stdin.read()
verbose = '-v' in sys.argv
if verbose:
import logging
d = dkim.DKIM(message, logger=logging)
else:
d = dkim.DKIM(message)
res = d.verify(args.index)
if not res:
print("signature verification failed")
sys.exit(1)
print("signature ok")
if __name__ == "__main__":
main()
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