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53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
#!/usr/bin/env python3
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"""Unpack a MIME message into a directory of files."""
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import os
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import email
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import mimetypes
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from email.policy import default
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from argparse import ArgumentParser
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def main():
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parser = ArgumentParser(description="""\
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Unpack a MIME message into a directory of files.
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""")
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parser.add_argument('-d', '--directory', required=True,
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help="""Unpack the MIME message into the named
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directory, which will be created if it doesn't already
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exist.""")
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parser.add_argument('msgfile')
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args = parser.parse_args()
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with open(args.msgfile, 'rb') as fp:
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msg = email.message_from_binary_file(fp, policy=default)
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try:
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os.mkdir(args.directory)
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except FileExistsError:
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pass
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counter = 1
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for part in msg.walk():
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# multipart/* are just containers
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if part.get_content_maintype() == 'multipart':
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continue
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# Applications should really sanitize the given filename so that an
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# email message can't be used to overwrite important files
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filename = part.get_filename()
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if not filename:
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ext = mimetypes.guess_extension(part.get_content_type())
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if not ext:
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# Use a generic bag-of-bits extension
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ext = '.bin'
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filename = f'part-{counter:03d}{ext}'
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counter += 1
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with open(os.path.join(args.directory, filename), 'wb') as fp:
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fp.write(part.get_payload(decode=True))
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if __name__ == '__main__':
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main()
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