Doc/lib/email-unpack.py

   1 #!/usr/bin/env python
   2
   3 """Unpack a MIME message into a directory of files."""
   4
   5 import os
   6 import sys
   7 import email
   8 import errno
   9 import mimetypes
  10
  11 from optparse import OptionParser
  12
  13
  14 def main():
  15     parser = OptionParser(usage="""\
  16 Unpack a MIME message into a directory of files.
  17
  18 Usage: %prog [options] msgfile
  19 """)
  20     parser.add_option('-d', '--directory',
  21                       type='string', action='store',
  22                       help="""Unpack the MIME message into the named
  23                       directory, which will be created if it doesn't already
  24                       exist.""")
  25     opts, args = parser.parse_args()
  26     if not opts.directory:
  27         parser.print_help()
  28         sys.exit(1)
  29
  30     try:
  31         msgfile = args[0]
  32     except IndexError:
  33         parser.print_help()
  34         sys.exit(1)
  35
  36     try:
  37         os.mkdir(opts.directory)
  38     except OSError, e:
  39         # Ignore directory exists error
  40         if e.errno <> errno.EEXIST:
  41             raise
  42
  43     fp = open(msgfile)
  44     msg = email.message_from_file(fp)
  45     fp.close()
  46
  47     counter = 1
  48     for part in msg.walk():
  49         # multipart/* are just containers
  50         if part.get_content_maintype() == 'multipart':
  51             continue
  52         # Applications should really sanitize the given filename so that an
  53         # email message can't be used to overwrite important files
  54         filename = part.get_filename()
  55         if not filename:
  56             ext = mimetypes.guess_extension(part.get_type())
  57             if not ext:
  58                 # Use a generic bag-of-bits extension
  59                 ext = '.bin'
  60             filename = 'part-%03d%s' % (counter, ext)
  61         counter += 1
  62         fp = open(os.path.join(opts.directory, filename), 'wb')
  63         fp.write(part.get_payload(decode=True))
  64         fp.close()
  65
  66
  67 if __name__ == '__main__':
  68     main()