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 from __future__ import absolute_import
19 from email import message_from_file as _message_from_file
20 from email.header import decode_header as _decode_header
21 import hashlib as _hashlib
22 import locale as _locale
23 import mailbox as _mailbox
25 import os.path as _os_path
29 from pgp_mime import verify as _verify
31 from . import LOG as _LOG
32 from .color import standard_colors as _standard_colors
33 from .color import color_string as _color_string
34 from .extract_mime import extract_mime as _extract_mime
35 from .extract_mime import message_time as _message_time
36 from .storage import assignment_path as _assignment_path
37 from .storage import set_late as _set_late
40 def mailpipe(basedir, course, stream=None, mailbox=None, input_=None,
41 output=None, max_late=0, use_color=None, dry_run=False, **kwargs):
42 """Run from procmail to sort incomming submissions
44 For example, you can setup your ``.procmailrc`` like this::
50 LOGFILE=$MAILDIR/procmail.log
52 PYGRADE_MAILPIPE="pg.py -d $HOME/grades/phys160"
54 # Grab all incoming homeworks emails. This rule eats matching emails
55 # (i.e. no further procmail processing).
57 * ^Subject:.*\[phys160-sub]
58 | "$PYGRADE_MAILPIPE" mailpipe
60 If you don't want procmail to eat the message, you can use the
61 ``c`` flag (carbon copy) by starting your rule off with ``:0 c``.
65 for msg,person,assignment,time in _load_messages(
66 course=course, stream=stream, mailbox=mailbox, input_=input_,
67 output=output, use_color=use_color, dry_run=dry_run):
68 assignment_path = _assignment_path(basedir, assignment, person)
69 _save_local_message_copy(
70 msg=msg, person=person, assignment_path=assignment_path,
71 use_color=use_color, dry_run=dry_run)
72 _extract_mime(message=msg, output=assignment_path, dry_run=dry_run)
74 basedir=basedir, assignment=assignment, person=person, time=time,
75 max_late=max_late, use_color=use_color, dry_run=dry_run)
77 def _load_messages(course, stream, mailbox=None, input_=None, output=None,
78 use_color=None, dry_run=False):
81 messages = [(None,_message_from_file(stream))]
82 elif mailbox == 'mbox':
83 mbox = _mailbox.mbox(input_, factory=None, create=False)
84 messages = mbox.items()
85 if output is not None:
86 ombox = _mailbox.mbox(output, factory=None, create=True)
87 elif mailbox == 'maildir':
88 mbox = _mailbox.Maildir(input_, factory=None, create=False)
89 messages = mbox.items()
90 if output is not None:
91 ombox = _mailbox.Maildir(output, factory=None, create=True)
93 raise ValueError(mailbox)
94 for key,msg in messages:
96 course=course, msg=msg, use_color=use_color)
98 if mbox is not None and output is not None and dry_run is False:
99 # move message from input mailbox to output mailbox
104 def _parse_message(course, msg, use_color=None):
105 highlight,lowlight,good,bad = _standard_colors(use_color=use_color)
106 mid = msg['Message-ID']
107 sender = msg['Return-Path'] # RFC 822
109 _LOG.debug(_color_string(
110 string='no Return-Path in {}'.format(mid), color=lowlight))
112 sender = sender[1:-1] # strip wrapping '<' and '>'
114 people = list(course.find_people(email=sender))
116 _LOG.warn(_color_string(
117 string='no person found to match {}'.format(sender),
121 _LOG.warn(_color_string(
122 string='multiple people match {} ({})'.format(
123 sender, ', '.join(str(p) for p in people)),
129 msg = _get_verified_message(msg, person.pgp_key, use_color=use_color)
133 if msg['Subject'] is None:
134 _LOG.warn(_color_string(
135 string='no subject in {}'.format(mid), color=bad))
137 parts = _decode_header(msg['Subject'])
139 _LOG.warn(_color_string(
140 string='multi-part header {}'.format(parts), color=bad))
142 subject,encoding = parts[0]
145 _LOG.debug('decoded header {} -> {}'.format(parts[0], subject))
146 subject = subject.lower().replace('#', '')
147 for assignment in course.assignments:
148 if _match_assignment(assignment, subject):
150 if not _match_assignment(assignment, subject):
151 _LOG.warn(_color_string(
152 string='no assignment found in {}'.format(repr(subject)),
156 time = _message_time(message=msg, use_color=use_color)
157 return (msg, person, assignment, time)
159 def _match_assignment(assignment, subject):
160 return assignment.name.lower() in subject
162 def _save_local_message_copy(msg, person, assignment_path, use_color=None,
164 highlight,lowlight,good,bad = _standard_colors(use_color=use_color)
166 _os.makedirs(assignment_path)
169 mpath = _os_path.join(assignment_path, 'mail')
171 mbox = _mailbox.Maildir(mpath, factory=None, create=not dry_run)
172 except _mailbox.NoSuchMailboxError as e:
173 _LOG.debug(_color_string(
174 string='could not open mailbox at {}'.format(mpath),
180 for other_msg in mbox:
181 if other_msg['Message-ID'] == msg['Message-ID']:
185 _LOG.debug(_color_string(
186 string='saving email from {} to {}'.format(
187 person, assignment_path), color=good))
188 if mbox is not None and not dry_run:
189 mdmsg = _mailbox.MaildirMessage(msg)
194 _LOG.debug(_color_string(
195 string='already found {} in {}'.format(
196 msg['Message-ID'], mpath), color=good))
198 def _check_late(basedir, assignment, person, time, max_late=0, use_color=None,
200 highlight,lowlight,good,bad = _standard_colors(use_color=use_color)
201 if time > assignment.due + max_late:
202 dt = time - assignment.due
203 _LOG.warn(_color_string(
204 string='{} {} late by {} seconds ({} hours)'.format(
205 person.name, assignment.name, dt, dt/3600.),
208 _set_late(basedir=basedir, assignment=assignment, person=person)
210 def _get_verified_message(message, pgp_key, use_color=None):
213 >>> from copy import deepcopy
214 >>> from pgp_mime import sign, encodedMIMEText
216 The student composes a message...
218 >>> message = encodedMIMEText('1.23 joules')
220 ... and signs it (with the pgp-mime test key).
222 >>> signed = sign(message, sign_as='4332B6E3')
224 As it is being delivered, the message picks up extra headers.
226 >>> signed['Message-ID'] = '<01234567@home.net>'
227 >>> signed['Received'] = 'from smtp.mail.uu.edu ...'
228 >>> signed['Received'] = 'from smtp.home.net ...'
230 We check that the message is signed, and that it is signed by the
233 >>> our_message = _get_verified_message(
234 ... deepcopy(signed), pgp_key='4332B6E3')
235 >>> print(our_message.as_string()) # doctest: +REPORT_UDIFF
236 Content-Type: text/plain; charset="us-ascii"
238 Content-Transfer-Encoding: 7bit
239 Content-Disposition: inline
240 Message-ID: <01234567@home.net>
241 Received: from smtp.mail.uu.edu ...
242 Received: from smtp.home.net ...
246 If it is signed, but not by the right key, we get ``None``.
248 >>> print(_get_verified_message(
249 ... deepcopy(signed), pgp_key='01234567'))
252 If it is not signed at all, we get ``None``.
254 >>> print(_get_verified_message(
255 ... deepcopy(message), pgp_key='4332B6E3'))
258 highlight,lowlight,good,bad = _standard_colors(use_color=use_color)
259 mid = message['message-id']
261 decrypted,verified,gpg_message = _verify(message=message)
262 except (ValueError, AssertionError):
263 _LOG.warn(_color_string(
264 string='could not verify {} (not signed?)'.format(mid),
267 _LOG.info(_color_string(gpg_message, color=lowlight))
269 _LOG.warn(_color_string(
270 string='{} has an invalid signature'.format(mid), color=bad))
273 for k,v in message.items(): # copy over useful headers
274 if k.lower() not in ['content-type',
276 'content-disposition',