email-unpack.py

#!/usr/bin/env python

"""Unpack a MIME message into a directory of files."""

importos
importsys
importemail
importerrno
importmimetypes

fromoptparseimportOptionParser


defmain():
parser=OptionParser(usage="""\
Unpack a MIME message into a directory of files.

Usage: %prog [options] msgfile
""")
parser.add_option('-d', '--directory',
type='string', action='store',
help="""Unpack the MIME message into the named
 directory, which will be created if it doesn't already
 exist.""")
opts, args=parser.parse_args()
ifnotopts.directory:
parser.print_help()
sys.exit(1)

try:
msgfile=args[0]
exceptIndexError:
parser.print_help()
sys.exit(1)

try:
os.mkdir(opts.directory)
exceptOSErrorase:
# Ignore directory exists error
ife.errno!=errno.EEXIST:
raise

fp=open(msgfile)
msg=email.message_from_file(fp)
fp.close()

counter=1
forpartinmsg.walk():
# multipart/* are just containers
ifpart.get_content_maintype() =='multipart':
continue
# Applications should really sanitize the given filename so that an
# email message can't be used to overwrite important files
filename=part.get_filename()
ifnotfilename:
ext=mimetypes.guess_extension(part.get_content_type())
ifnotext:
# Use a generic bag-of-bits extension
ext='.bin'
filename='part-%03d%s'% (counter, ext)
counter+=1
fp=open(os.path.join(opts.directory, filename), 'wb')
fp.write(part.get_payload(decode=True))
fp.close()


if__name__=='__main__':
main()