Scott Kitterman
56 lines
2.4 KiB
Python
56 lines
2.4 KiB
Python
#!/usr/bin/env python
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# This software is provided 'as-is', without any express or implied
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# warranty. In no event will the author be held liable for any damages
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# arising from the use of this software.
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#
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# Permission is granted to anyone to use this software for any purpose,
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# including commercial applications, and to alter it and redistribute it
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# freely, subject to the following restrictions:
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#
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# 1. The origin of this software must not be misrepresented; you must not
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# claim that you wrote the original software. If you use this software
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# in a product, an acknowledgment in the product documentation would be
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# appreciated but is not required.
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# 2. Altered source versions must be plainly marked as such, and must not be
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# misrepresented as being the original software.
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# 3. This notice may not be removed or altered from any source distribution.
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#
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# Copyright (c) 2008 Greg Hewgill http://hewgill.com
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#
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# This has been modified from the original software.
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# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
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from __future__ import print_function
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import sys
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import argparse
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import dkim
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# Backward compatibility hack because argparse doesn't support optional
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# positional arguments
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arguments=['--'+arg if arg[:8] == 'identity' else arg for arg in sys.argv[1:]]
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parser = argparse.ArgumentParser(description='Produce DKIM signature for email messages.')
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parser.add_argument('selector', action="store")
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parser.add_argument('domain', action="store")
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parser.add_argument('privatekeyfile', action="store")
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parser.add_argument('--hcanon', choices=['simple', 'relaxed'], default='relaxed', type=bytes, help='Header canonicalization algorithm: default=relaxed')
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parser.add_argument('--bcanon', choices=['simple', 'relaxed'], default='simple', type=bytes, help='Body canonicalization algorithm: default=simple')
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parser.add_argument('--identity', help='Optional value for i= tag.')
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args=parser.parse_args(arguments)
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if sys.version_info[0] >= 3:
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# Make sys.stdin and stdout binary streams.
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sys.stdin = sys.stdin.detach()
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sys.stdout = sys.stdout.detach()
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message = sys.stdin.read()
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try:
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sig = dkim.sign(message, args.selector, args.domain, open(args.privatekeyfile, "rb").read(), identity = args.identity, canonicalize=(args.hcanon, args.bcanon))
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sys.stdout.write(sig)
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sys.stdout.write(message)
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except Exception as e:
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print(e, file=sys.stderr)
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sys.stdout.write(message)
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