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68 lines
1.8 KiB
Python
68 lines
1.8 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 sys
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import email
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import errno
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import mimetypes
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from optparse import OptionParser
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def main():
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parser = OptionParser(usage="""\
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Unpack a MIME message into a directory of files.
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Usage: %prog [options] msgfile
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""")
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parser.add_option('-d', '--directory',
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type='string', action='store',
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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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opts, args = parser.parse_args()
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if not opts.directory:
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parser.print_help()
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sys.exit(1)
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try:
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msgfile = args[0]
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except IndexError:
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parser.print_help()
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sys.exit(1)
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try:
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os.mkdir(opts.directory)
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except OSError as e:
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# Ignore directory exists error
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if e.errno != errno.EEXIST:
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raise
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fp = open(msgfile)
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msg = email.message_from_file(fp)
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fp.close()
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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 = 'part-%03d%s' % (counter, ext)
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counter += 1
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fp = open(os.path.join(opts.directory, filename), 'wb')
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fp.write(part.get_payload(decode=True))
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fp.close()
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if __name__ == '__main__':
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main()
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