1 # Copyright (C) 2012 W. Trevor King <wking@drexel.edu>
3 # This file is part of pygrader.
5 # pygrader is free software: you can redistribute it and/or modify it under the
6 # terms of the GNU General Public License as published by the Free Software
7 # Foundation, either version 3 of the License, or (at your option) any later
10 # pygrader is distributed in the hope that it will be useful, but WITHOUT ANY
11 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License along with
15 # pygrader. If not, see <http://www.gnu.org/licenses/>.
17 """Extract message parts with a given MIME type from a mailbox.
20 from __future__ import absolute_import
22 import email.utils as _email_utils
23 import hashlib as _hashlib
24 import mailbox as _mailbox
26 import os.path as _os_path
29 from . import LOG as _LOG
30 from .color import color_string as _color_string
31 from .color import standard_colors as _standard_colors
34 def message_time(message, use_color=None):
35 highlight,lowlight,good,bad = _standard_colors(use_color=use_color)
36 received = message['Received'] # RFC 822
38 mid = message['Message-ID']
39 _LOG.debug(_color_string(
40 string='no Received in {}'.format(mid), color=lowlight))
42 date = received.split(';', 1)[1]
43 return _time.mktime(_email_utils.parsedate(date))
45 def extract_mime(message, mime_type=None, output='.', dry_run=False):
46 _LOG.debug('parsing {}'.format(message['Subject']))
47 time = message_time(message=message)
48 for part in message.walk():
49 fname = part.get_filename()
51 continue # don't extract parts without filenames
52 ffname = _os_path.join(output, fname) # full file name
53 ctype = part.get_content_type()
54 if mime_type is None or ctype == mime_type:
55 contents = part.get_payload(decode=True)
59 while _os_path.exists(ffname):
60 old = _hashlib.sha1(open(ffname, 'rb').read())
61 new = _hashlib.sha1(contents)
62 if old.digest() == new.digest():
66 ffname = '{}.{}'.format(base_ffname, count)
68 _LOG.debug('{} already extracted as {}'.format(fname, ffname))
70 _LOG.debug('extract {} to {}'.format(fname, ffname))
72 with open(ffname, 'wb') as f:
75 _os.utime(ffname, (time, time))