1 #!/usr/bin/env python3 2 3 """Unpack a MIME message into a directory of files.""" 4 5 import os 6 import email 7 import mimetypes 8 9 from email.policy import default 10 11 from argparse import ArgumentParser 12 13 14 def main(): 15 parser = ArgumentParser(description="""\ 16 Unpack a MIME message into a directory of files. 17 """) 18 parser.add_argument('-d', '--directory', required=True, 19 help="""Unpack the MIME message into the named 20 directory, which will be created if it doesn't already 21 exist.""") 22 parser.add_argument('msgfile') 23 args = parser.parse_args() 24 25 with open(args.msgfile, 'rb') as fp: 26 msg = email.message_from_binary_file(fp, policy=default) 27 28 try: 29 os.mkdir(args.directory) 30 except FileExistsError: 31 pass 32 33 counter = 1 34 for part in msg.walk(): 35 # multipart/* are just containers 36 if part.get_content_maintype() == 'multipart': 37 continue 38 # Applications should really sanitize the given filename so that an 39 # email message can't be used to overwrite important files 40 filename = part.get_filename() 41 if not filename: 42 ext = mimetypes.guess_extension(part.get_content_type()) 43 if not ext: 44 # Use a generic bag-of-bits extension 45 ext = '.bin' 46 filename = 'part-%03d%s' % (counter, ext) 47 counter += 1 48 with open(os.path.join(args.directory, filename), 'wb') as fp: 49 fp.write(part.get_payload(decode=True)) 50 51 52 if __name__ == '__main__': 53 main() 54
