-
Notifications
You must be signed in to change notification settings - Fork 57
/
IMAP.py
1053 lines (914 loc) · 44.9 KB
/
IMAP.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
# IMAP folder support
# Copyright (C) 2002-2016 John Goerzen & contributors.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import random
import binascii
import re
import time
from sys import exc_info
from offlineimap import imaputil, imaplibutil, emailutil, OfflineImapError
from offlineimap import globals
from imaplib2 import MonthNames
from .Base import BaseFolder
# Globals
CRLF = '\r\n'
MSGCOPY_NAMESPACE = 'MSGCOPY_'
# NB: message returned from getmessage() will have '\n' all over the place,
# NB: there will be no CRLFs. Just before the sending stage of savemessage()
# NB: '\n' will be transformed back to CRLF. So, for the most parts of the
# NB: code the stored content will be clean of CRLF and one can rely that
# NB: line endings will be pure '\n'.
class IMAPFolder(BaseFolder):
def __init__(self, imapserver, name, repository, decode=True):
# decode the folder name from IMAP4_utf_7 to utf_8 if
# - utf8foldernames is enabled for the *account*
# - the decode argument is given
# (default True is used when the folder name is the result of
# querying the IMAP server, while False is used when creating
# a folder object from a locally available utf_8 name)
# In any case the given name is first dequoted.
name = imaputil.dequote(name)
if decode and repository.account.utf_8_support:
name = imaputil.IMAP_utf8(name)
self.sep = imapserver.delim
super(IMAPFolder, self).__init__(name, repository)
if repository.getdecodefoldernames():
self.visiblename = imaputil.decode_mailbox_name(self.visiblename)
self.idle_mode = False
self.expunge = repository.getexpunge()
self.root = None # imapserver.root
self.imapserver = imapserver
self.randomgenerator = random.Random()
# self.ui is set in BaseFolder.
self.imap_query = ['BODY.PEEK[]']
# number of times to retry fetching messages
self.retrycount = self.repository.getconfint('retrycount', 2)
fh_conf = self.repository.account.getconf('filterheaders', '')
self.filterheaders = [h for h in re.split(r'\s*,\s*', fh_conf) if h]
# self.copy_ignoreUIDs is used by BaseFolder.
self.copy_ignoreUIDs = repository.get_copy_ignore_UIDs(
self.getvisiblename())
if self.repository.getidlefolders():
self.idle_mode = True
def __selectro(self, imapobj, force=False):
"""Select this folder when we do not need write access.
Prefer SELECT to EXAMINE if we can, since some servers
(Courier) do not stabilize UID validity until the folder is
selected.
.. todo: Still valid? Needs verification
:param: Enforce new SELECT even if we are on that folder already.
:returns: raises :exc:`OfflineImapError` severity FOLDER on error"""
try:
imapobj.select(self.getfullIMAPname(), force=force)
except imapobj.readonly:
imapobj.select(self.getfullIMAPname(), readonly=True, force=force)
def getfullIMAPname(self):
name = self.getfullname()
if self.repository.account.utf_8_support:
name = imaputil.utf8_IMAP(name)
return imaputil.foldername_to_imapname(name)
# Interface from BaseFolder
def suggeststhreads(self):
singlethreadperfolder_default = False
if self.idle_mode is True:
singlethreadperfolder_default = True
onethread = self.config.getdefaultboolean(
"Repository %s" % self.repository.getname(),
"singlethreadperfolder", singlethreadperfolder_default)
if onethread is True:
return False
return not globals.options.singlethreading
# Interface from BaseFolder
def waitforthread(self):
self.imapserver.connectionwait()
def getmaxage(self):
if self.config.getdefault("Account %s" %
self.accountname, "maxage", None):
raise OfflineImapError(
"maxage is not supported on IMAP-IMAP sync",
OfflineImapError.ERROR.REPO,
exc_info()[2])
# Interface from BaseFolder
def getinstancelimitnamespace(self):
return MSGCOPY_NAMESPACE + self.repository.getname()
# Interface from BaseFolder
def get_uidvalidity(self):
"""Retrieve the current connections UIDVALIDITY value
UIDVALIDITY value will be cached on the first call.
:returns: The UIDVALIDITY as (long) number."""
if hasattr(self, '_uidvalidity'):
# Use cached value if existing.
return self._uidvalidity
imapobj = self.imapserver.acquireconnection()
try:
# SELECT (if not already done) and get current UIDVALIDITY.
self.__selectro(imapobj)
typ, uidval = imapobj.response('UIDVALIDITY')
assert uidval != [None] and uidval is not None, \
"response('UIDVALIDITY') returned [None]!"
self._uidvalidity = int(uidval[-1])
return self._uidvalidity
finally:
self.imapserver.releaseconnection(imapobj)
# Interface from BaseFolder
def quickchanged(self, statusfolder):
# An IMAP folder has definitely changed if the number of
# messages or the UID of the last message have changed. Otherwise
# only flag changes could have occurred.
retry = True # Should we attempt another round or exit?
imapdata = None
while retry:
retry = False
imapobj = self.imapserver.acquireconnection()
try:
# Select folder and get number of messages.
restype, imapdata = imapobj.select(self.getfullIMAPname(), True,
True)
self.imapserver.releaseconnection(imapobj)
except OfflineImapError as e:
# Retry on dropped connections, raise otherwise.
self.imapserver.releaseconnection(imapobj, True)
if e.severity == OfflineImapError.ERROR.FOLDER_RETRY:
retry = True
else:
raise
except:
# Cleanup and raise on all other errors.
self.imapserver.releaseconnection(imapobj, True)
raise
# 1. Some mail servers do not return an EXISTS response
# if the folder is empty. 2. ZIMBRA servers can return
# multiple EXISTS replies in the form 500, 1000, 1500,
# 1623 so check for potentially multiple replies.
if imapdata == [None]:
return True
maxmsgid = 0
for msgid in imapdata:
maxmsgid = max(int(msgid), maxmsgid)
# Different number of messages than last time?
if maxmsgid != statusfolder.getmessagecount():
return True
return False
def _msgs_to_fetch(self, imapobj, min_date=None, min_uid=None):
"""Determines sequence numbers of messages to be fetched.
Message sequence numbers (MSNs) are more easily compacted
into ranges which makes transactions slightly faster.
Arguments:
- imapobj: instance of IMAPlib
- min_date (optional): a time_struct; only fetch messages newer
than this
- min_uid (optional): only fetch messages with UID >= min_uid
This function should be called with at MOST one of min_date OR
min_uid set but not BOTH.
Returns: range(s) for messages or None if no messages
are to be fetched."""
def search(search_conditions):
"""Actually request the server with the specified conditions.
Returns: range(s) for messages or None if no messages
are to be fetched."""
try:
res_type, res_data = imapobj.search(None, search_conditions)
if res_type != 'OK':
msg = "SEARCH in folder [%s]%s failed. " \
"Search string was '%s'. " \
"Server responded '[%s] %s'" % \
(self.getrepository(), self, search_cond,
res_type, res_data)
raise OfflineImapError(msg, OfflineImapError.ERROR.FOLDER)
except Exception as e:
msg = "SEARCH in folder [%s]%s failed. "\
"Search string was '%s'. Error: %s" % \
(self.getrepository(), self, search_cond, str(e))
raise OfflineImapError(msg, OfflineImapError.ERROR.FOLDER)
"""
In Py2, with IMAP, imaplib2 returned a list of one element string.
['1, 2, 3, ...'] -> in Py3 is [b'1 2 3,...']
In Py2, with Davmail, imaplib2 returned a list of strings.
['1', '2', '3', ...] -> in Py3 should be [b'1', b'2', b'3',...]
In my tests with Py3, I get a list with one element: [b'1 2 3 ...']
Then I convert the values to string and I get ['1 2 3 ...']
With Davmail, it should be [b'1', b'2', b'3',...]
When I convert the values to string, I get ['1', '2', '3',...]
"""
res_data = [x.decode('utf-8') for x in res_data]
# Then, I can do the check in the same way than Python 2
# with string comparison:
if len(res_data) > 0 and (' ' in res_data[0] or res_data[0] == ''):
res_data = res_data[0].split()
# Some servers are broken.
if 0 in res_data:
self.ui.warn("server returned UID with 0; ignoring.")
res_data.remove(0)
return res_data
a = self.getfullIMAPname()
res_type, imapdata = imapobj.select(a, True, True)
# imaplib2 returns the type as string, like "OK" but
# returns imapdata as list of bytes, like [b'0'] so we need decode it
# to use the existing code
imapdata = [x.decode('utf-8') for x in imapdata]
if imapdata == [None] or imapdata[0] == '0':
# Empty folder, no need to populate message list.
return None
conditions = []
# 1. min_uid condition.
if min_uid is not None:
conditions.append("UID %d:*" % min_uid)
# 2. date condition.
elif min_date is not None:
# Find out what the oldest message is that we should look at.
conditions.append("SINCE %02d-%s-%d" % (
min_date[2], MonthNames[min_date[1]], min_date[0]))
# 3. maxsize condition.
maxsize = self.getmaxsize()
if maxsize is not None:
conditions.append("SMALLER %d" % maxsize)
if len(conditions) >= 1:
# Build SEARCH command.
search_cond = "(%s)" % ' '.join(conditions)
search_result = search(search_cond)
return imaputil.uid_sequence(search_result)
# By default consider all messages in this folder.
return '1:*'
# Interface from BaseFolder
def msglist_item_initializer(self, uid):
return {'uid': uid, 'flags': set(), 'time': 0}
# Interface from BaseFolder
def cachemessagelist(self, min_date=None, min_uid=None):
self.ui.loadmessagelist(self.repository, self)
self.dropmessagelistcache()
imapobj = self.imapserver.acquireconnection()
try:
msgsToFetch = self._msgs_to_fetch(
imapobj, min_date=min_date, min_uid=min_uid)
if not msgsToFetch:
return # No messages to sync.
# Get the flags and UIDs for these. single-quotes prevent
# imaplib2 from quoting the sequence.
fetch_msg = "%s" % msgsToFetch
self.ui.debug('imap', "calling imaplib2 fetch command: %s %s" %
(fetch_msg, '(FLAGS UID INTERNALDATE)'))
res_type, response = imapobj.fetch(
fetch_msg, '(FLAGS UID INTERNALDATE)')
if res_type != 'OK':
msg = "FETCHING UIDs in folder [%s]%s failed. "\
"Server responded '[%s] %s'" % \
(self.getrepository(), self, res_type, response)
raise OfflineImapError(msg, OfflineImapError.ERROR.FOLDER)
finally:
self.imapserver.releaseconnection(imapobj)
for messagestr in response:
# Looks like: '1 (FLAGS (\\Seen Old) UID 4807)' or None if no msg.
# Discard initial message number.
if messagestr is None:
continue
messagestr = messagestr.decode('utf-8').split(' ', 1)[1]
options = imaputil.flags2hash(messagestr)
if 'UID' not in options:
self.ui.warn('No UID in message with options %s' %
str(options), minor=1)
else:
uid = int(options['UID'])
self.messagelist[uid] = self.msglist_item_initializer(uid)
flags = imaputil.flagsimap2maildir(options['FLAGS'])
keywords = imaputil.flagsimap2keywords(options['FLAGS'])
rtime = imaplibutil.Internaldate2epoch(
messagestr.encode('utf-8'))
self.messagelist[uid] = {'uid': uid,
'flags': flags,
'time': rtime,
'keywords': keywords}
self.ui.messagelistloaded(self.repository, self, self.getmessagecount())
# Interface from BaseFolder
def getmessage(self, uid):
"""Retrieve message with UID from the IMAP server (incl body).
After this function all CRLFs will be transformed to '\n'.
:returns: the message body or throws and OfflineImapError
(probably severity MESSAGE) if e.g. no message with
this UID could be found.
"""
data = self._fetch_from_imap(str(uid), self.retrycount)
# Data looks now e.g.
# ['320 (17061 BODY[] {2565}','msgbody....']
# Is a list of two elements. Message is at [1]
data = data[1].replace(CRLF, "\n")
if len(data) > 200:
dbg_output = "%s...%s" % (str(data)[:150], str(data)[-50:])
else:
dbg_output = data
self.ui.debug('imap', "Returned object from fetching %d: '%s'" %
(uid, dbg_output))
return data
# Interface from BaseFolder
def getmessagetime(self, uid):
return self.messagelist[uid]['time']
# Interface from BaseFolder
def getmessageflags(self, uid):
return self.messagelist[uid]['flags']
# Interface from BaseFolder
def getmessagekeywords(self, uid):
return self.messagelist[uid]['keywords']
def __generate_randomheader(self, content):
"""Returns a unique X-OfflineIMAP header
Generate an 'X-OfflineIMAP' mail header which contains a random
unique value (which is based on the mail content, and a random
number). This header allows us to fetch a mail after APPENDing
it to an IMAP server and thus find out the UID that the server
assigned it.
:returns: (headername, headervalue) tuple, consisting of strings
headername == 'X-OfflineIMAP' and headervalue will be a
random string
"""
headername = 'X-OfflineIMAP'
# We need a random component too. If we ever upload the same
# mail twice (e.g. in different folders), we would still need to
# get the UID for the correct one. As we won't have too many
# mails with identical content, the randomness requirements are
# not extremly critial though.
# Compute unsigned crc32 of 'content' as unique hash.
# NB: crc32 returns unsigned only starting with python 3.0.
headervalue = str(binascii.crc32(str.encode(content))
& 0xffffffff) + '-'
headervalue += str(self.randomgenerator.randint(0, 9999999999))
return headername, headervalue
def __savemessage_searchforheader(self, imapobj, headername, headervalue):
self.ui.debug('imap',
'__savemessage_searchforheader called for %s: %s' %
(headername, headervalue))
# Now find the UID it got.
headervalue = imapobj._quote(headervalue)
try:
matchinguids = imapobj.uid('search', 'HEADER',
headername, headervalue)[1][0]
# Returned value is type bytes
matchinguids = matchinguids.decode('utf-8')
except imapobj.error as err:
# IMAP server doesn't implement search or had a problem.
self.ui.debug('imap',
"__savemessage_searchforheader: got IMAP error '%s' "
"while attempting to UID SEARCH for message with "
"header %s" % (err, headername))
return 0
self.ui.debug('imap',
"__savemessage_searchforheader got initial "
"matchinguids: " + repr(matchinguids))
if matchinguids == '':
self.ui.debug('imap',
"__savemessage_searchforheader: UID SEARCH "
"for message with header %s yielded no results" %
headername)
return 0
matchinguids = matchinguids.split(' ')
self.ui.debug('imap', '__savemessage_searchforheader: matchinguids now '
+ repr(matchinguids))
if len(matchinguids) != 1 or matchinguids[0] is None:
raise OfflineImapError(
"While attempting to find UID for message with "
"header %s, got wrong-sized matchinguids of %s" %
(headername, str(matchinguids)),
OfflineImapError.ERROR.MESSAGE
)
return int(matchinguids[0])
def __savemessage_fetchheaders(self, imapobj, headername, headervalue):
""" We fetch all new mail headers and search for the right
X-OfflineImap line by hand. The response from the server has form:
(
'OK',
[
(
'185 (RFC822.HEADER {1789}',
'... mail headers ...'
),
' UID 2444)',
(
'186 (RFC822.HEADER {1789}',
'... 2nd mail headers ...'
),
' UID 2445)'
]
)
We need to locate the UID just after mail headers containing our
X-OfflineIMAP line.
Returns UID when found, 0 when not found."""
self.ui.debug('imap', '__savemessage_fetchheaders called for %s: %s' %
(headername, headervalue))
# Run "fetch X:* rfc822.header".
# Since we stored the mail we are looking for just recently, it would
# not be optimal to fetch all messages. So we'll find highest message
# UID in our local messagelist and search from there (exactly from
# UID+1). That works because UIDs are guaranteed to be unique and
# ascending.
if self.getmessagelist():
start = 1 + max(self.getmessagelist().keys())
else:
# Folder was empty - start from 1.
start = 1
result = imapobj.uid('FETCH', '%d:*' % start, 'rfc822.header')
if result[0] != 'OK':
msg = 'Error fetching mail headers: %s' % '. '.join(result[1])
raise OfflineImapError(msg, OfflineImapError.ERROR.MESSAGE)
# result is like:
# [
# ('185 (RFC822.HEADER {1789}', '... mail headers ...'),
# ' UID 2444)',
# ('186 (RFC822.HEADER {1789}', '... 2nd mail headers ...'),
# ' UID 2445)'
# ]
result = result[1]
found = None
# item is like:
# ('185 (RFC822.HEADER {1789}', '... mail headers ...'), ' UID 2444)'
for item in result:
if found is None and type(item) == tuple:
# Decode the value
item = [x.decode('utf-8') for x in item]
# Walk just tuples.
if re.search("(?:^|\\r|\\n)%s:\s*%s(?:\\r|\\n)" %
(headername, headervalue),
item[1], flags=re.IGNORECASE):
found = item[0]
elif found is not None:
if isinstance(item, bytes):
item = item.decode('utf-8')
uid = re.search("UID\s+(\d+)", item, flags=re.IGNORECASE)
if uid:
return int(uid.group(1))
else:
# This parsing is for Davmail.
# https://github.com/OfflineIMAP/offlineimap/issues/479
# item is like:
# ')'
# and item[0] stored in "found" is like:
# '1694 (UID 1694 RFC822.HEADER {1294}'
uid = re.search("\d+\s+\(UID\s+(\d+)", found,
flags=re.IGNORECASE)
if uid:
return int(uid.group(1))
self.ui.warn("Can't parse FETCH response, "
"can't find UID in %s" % item)
self.ui.debug('imap', "Got: %s" % repr(result))
else:
self.ui.warn("Can't parse FETCH response, "
"we awaited string: %s" % repr(item))
return 0
def __getmessageinternaldate(self, content, rtime=None):
"""Parses mail and returns an INTERNALDATE string
It will use information in the following order, falling back as an
attempt fails:
- rtime parameter
- Date header of email
We return None, if we couldn't find a valid date. In this case
the IMAP server will use the server local time when appening
(per RFC).
Note, that imaplib's Time2Internaldate is inherently broken as
it returns localized date strings which are invalid for IMAP
servers. However, that function is called for *every* append()
internally. So we need to either pass in `None` or the correct
string (in which case Time2Internaldate() will do nothing) to
append(). The output of this function is designed to work as
input to the imapobj.append() function.
TODO: We should probably be returning a bytearray rather than a
string here, because the IMAP server will expect plain
ASCII. However, imaplib.Time2INternaldate currently returns a
string so we go with the same for now.
:param rtime: epoch timestamp to be used rather than analyzing
the email.
:returns: string in the form of "DD-Mmm-YYYY HH:MM:SS +HHMM"
(including double quotes) or `None` in case of failure
(which is fine as value for append)."""
if rtime is None:
rtime = emailutil.get_message_date(content)
if rtime is None:
return None
datetuple = time.localtime(rtime)
try:
# Check for invalid dates.
if datetuple[0] < 1981:
raise ValueError
# Check for invalid dates.
datetuple_check = time.localtime(time.mktime(datetuple))
if datetuple[:2] != datetuple_check[:2]:
raise ValueError
except (ValueError, OverflowError):
# Argh, sometimes it's a valid format but year is 0102
# or something. Argh. It seems that Time2Internaldate
# will rause a ValueError if the year is 0102 but not 1902,
# but some IMAP servers nonetheless choke on 1902.
self.ui.debug('imap', "Message with invalid date %s. "
"Server will use local time." % datetuple)
return None
# Produce a string representation of datetuple that works as
# INTERNALDATE.
num2mon = {1: 'Jan', 2: 'Feb', 3: 'Mar',
4: 'Apr', 5: 'May', 6: 'Jun',
7: 'Jul', 8: 'Aug', 9: 'Sep',
10: 'Oct', 11: 'Nov', 12: 'Dec'}
# tm_isdst coming from email.parsedate is not usable, we still use it
# here, mhh.
if datetuple.tm_isdst == 1:
zone = -time.altzone
else:
zone = -time.timezone
offset_h, offset_m = divmod(zone // 60, 60)
internaldate = '"%02d-%s-%04d %02d:%02d:%02d %+03d%02d"' % \
(datetuple.tm_mday, num2mon[datetuple.tm_mon],
datetuple.tm_year, datetuple.tm_hour,
datetuple.tm_min, datetuple.tm_sec,
offset_h, offset_m)
return internaldate
# Interface from BaseFolder
def savemessage(self, uid, content, flags, rtime):
"""Save the message on the Server
This backend always assigns a new uid, so the uid arg is ignored.
This function will update the self.messagelist dict to contain
the new message after sucessfully saving it.
See folder/Base for details. Note that savemessage() does not
check against dryrun settings, so you need to ensure that
savemessage is never called in a dryrun mode.
:param uid: Message UID
:param content: Message content
:param flags: Message flags
:param rtime: A timestamp to be used as the mail date
:returns: the UID of the new message as assigned by the server. If the
message is saved, but it's UID can not be found, it will
return 0. If the message can't be written (folder is
read-only for example) it will return -1."""
self.ui.savemessage('imap', uid, flags, self)
# Already have it, just save modified flags.
if uid > 0 and self.uidexists(uid):
self.savemessageflags(uid, flags)
return uid
content = self.deletemessageheaders(content, self.filterheaders)
# Use proper CRLF all over the message.
content = re.sub("(?<!\r)\n", CRLF, content)
# Get the date of the message, so we can pass it to the server.
date = self.__getmessageinternaldate(content, rtime)
# Message-ID is handy for debugging messages.
msg_id = self.getmessageheader(content, "message-id")
if not msg_id:
msg_id = '[unknown message-id]'
retry_left = 2 # succeeded in APPENDING?
imapobj = self.imapserver.acquireconnection()
# NB: in the finally clause for this try we will release
# NB: the acquired imapobj, so don't do that twice unless
# NB: you will put another connection to imapobj. If you
# NB: really do need to release connection manually, set
# NB: imapobj to None.
try:
while retry_left:
# XXX: we can mangle message only once, out of the loop
# UIDPLUS extension provides us with an APPENDUID response.
use_uidplus = 'UIDPLUS' in imapobj.capabilities
if not use_uidplus:
# Insert a random unique header that we can fetch later.
(headername, headervalue) = self.__generate_randomheader(
content)
self.ui.debug('imap', 'savemessage: header is: %s: %s' %
(headername, headervalue))
content = self.addmessageheader(content, CRLF,
headername, headervalue)
if len(content) > 200:
dbg_output = "%s...%s" % (content[:150], content[-50:])
else:
dbg_output = content
self.ui.debug('imap', "savemessage: date: %s, content: '%s'" %
(date, dbg_output))
try:
# Select folder for append and make the box READ-WRITE.
imapobj.select(self.getfullIMAPname())
except imapobj.readonly:
# readonly exception. Return original uid to notify that
# we did not save the message. (see savemessage in Base.py)
self.ui.msgtoreadonly(self, uid, content, flags)
return uid
# Do the APPEND.
try:
(typ, dat) = imapobj.append(
self.getfullIMAPname(),
imaputil.flagsmaildir2imap(flags),
date, bytes(content, 'utf-8'))
# This should only catch 'NO' responses since append()
# will raise an exception for 'BAD' responses:
if typ != 'OK':
# For example, Groupwise IMAP server
# can return something like:
#
# NO APPEND The 1500 MB storage limit \
# has been exceeded.
#
# In this case, we should immediately abort
# the repository sync and continue
# with the next account.
msg = \
"Saving msg (%s) in folder '%s', " \
"repository '%s' failed (abort). " \
"Server responded: %s %s\n" % \
(msg_id, self, self.getrepository(), typ, dat)
raise OfflineImapError(msg, OfflineImapError.ERROR.REPO)
retry_left = 0 # Mark as success.
except imapobj.abort as e:
# Connection has been reset, release connection and retry.
retry_left -= 1
self.imapserver.releaseconnection(imapobj, True)
imapobj = self.imapserver.acquireconnection()
if not retry_left:
raise OfflineImapError(
"Saving msg (%s) in folder '%s', "
"repository '%s' failed (abort). "
"Server responded: %s\n"
"Message content was: %s" %
(msg_id, self, self.getrepository(),
str(e), dbg_output),
OfflineImapError.ERROR.MESSAGE,
exc_info()[2])
# XXX: is this still needed?
self.ui.error(e, exc_info()[2])
except imapobj.error as e: # APPEND failed
# If the server responds with 'BAD', append()
# raise()s directly. So we catch that too.
# drop conn, it might be bad.
self.imapserver.releaseconnection(imapobj, True)
imapobj = None
raise OfflineImapError(
"Saving msg (%s) folder '%s', repo '%s'"
"failed (error). Server responded: %s\n"
"Message content was: %s" %
(msg_id, self, self.getrepository(),
str(e), dbg_output),
OfflineImapError.ERROR.MESSAGE,
exc_info()[2])
# Checkpoint. Let it write out stuff, etc. Eg searches for
# just uploaded messages won't work if we don't do this.
(typ, dat) = imapobj.check()
assert (typ == 'OK')
# Get the new UID, do we use UIDPLUS?
if use_uidplus:
# Get new UID from the APPENDUID response, it could look
# like OK [APPENDUID 38505 3955] APPEND completed with
# 38505 bein folder UIDvalidity and 3955 the new UID.
# note: we would want to use .response() here but that
# often seems to return [None], even though we have
# data. TODO
resp = imapobj._get_untagged_response('APPENDUID')
if resp == [None] or resp is None:
self.ui.warn("Server supports UIDPLUS but got no APPENDUID "
"appending a message. Got: %s." % str(resp))
return 0
try:
# Convert the UID from [b'4 1532'] to ['4 1532']
s_uid = [x.decode('utf-8') for x in resp]
# Now, read the UID field
uid = int(s_uid[-1].split(' ')[1])
except ValueError:
uid = 0 # Definetly not what we should have.
except Exception:
raise OfflineImapError("Unexpected response: %s" %
str(resp),
OfflineImapError.ERROR.MESSAGE)
if uid == 0:
self.ui.warn("savemessage: Server supports UIDPLUS, but"
" we got no usable UID back. APPENDUID "
"reponse was '%s'" % str(resp))
else:
try:
# We don't use UIDPLUS.
uid = self.__savemessage_searchforheader(imapobj,
headername,
headervalue)
# See docs for savemessage in Base.py for explanation
# of this and other return values.
if uid == 0:
self.ui.debug('imap',
'savemessage: attempt to get new UID '
'UID failed. Search headers manually.')
uid = self.__savemessage_fetchheaders(imapobj,
headername,
headervalue)
self.ui.warn("savemessage: Searching mails for new "
"Message-ID failed. "
"Could not determine new UID on %s." %
self.getname())
# Something wrong happened while trying to get the UID. Explain
# the error might be about the 'get UID' process not necesseraly
# the APPEND.
except Exception:
self.ui.warn("%s: could not determine the UID while we got "
"no error while appending the "
"email with '%s: %s'" %
(self.getname(), headername, headervalue))
raise
finally:
if imapobj:
self.imapserver.releaseconnection(imapobj)
if uid: # Avoid UID FETCH 0 crash happening later on.
self.messagelist[uid] = self.msglist_item_initializer(uid)
self.messagelist[uid]['flags'] = flags
self.ui.debug('imap', 'savemessage: returning new UID %d' % uid)
return uid
def _fetch_from_imap(self, uids, retry_num=1):
"""Fetches data from IMAP server.
Arguments:
- uids: message UIDS
- retry_num: number of retries to make
Returns: data obtained by this query."""
imapobj = self.imapserver.acquireconnection()
try:
query = "(%s)" % (" ".join(self.imap_query))
fails_left = retry_num # Retry on dropped connection.
while fails_left:
try:
imapobj.select(self.getfullIMAPname(), readonly=True)
res_type, data = imapobj.uid('fetch', uids, query)
break
except imapobj.abort as e:
fails_left -= 1
# self.ui.error() will show the original traceback.
if fails_left <= 0:
message = ("%s, while fetching msg %r in folder %r."
" Max retry reached (%d)" %
(e, uids, self.name, retry_num))
raise OfflineImapError(message,
OfflineImapError.ERROR.MESSAGE)
self.ui.error("%s. While fetching msg %r in folder %r."
" Query: %s Retrying (%d/%d)" % (
e, uids, self.name, query,
retry_num - fails_left, retry_num))
# Release dropped connection, and get a new one.
self.imapserver.releaseconnection(imapobj, True)
imapobj = self.imapserver.acquireconnection()
finally:
# The imapobj here might be different than the one created before
# the ``try`` clause. So please avoid transforming this to a nice
# ``with`` without taking this into account.
self.imapserver.releaseconnection(imapobj)
# Ensure to not consider unsolicited FETCH responses caused by flag
# changes from concurrent connections. These appear as strings in
# 'data' (the BODY response appears as a tuple). This should leave
# exactly one response.
if res_type == 'OK':
data = [res for res in data if not isinstance(res, bytes)]
# Could not fetch message. Note: it is allowed by rfc3501 to return any
# data for the UID FETCH command.
if data == [None] or res_type != 'OK' or len(data) != 1:
severity = OfflineImapError.ERROR.MESSAGE
reason = "IMAP server '%s' failed to fetch messages UID '%s'. " \
"Server responded: %s %s" % (self.getrepository(), uids,
res_type, data)
if data == [None] or len(data) < 1:
# IMAP server did not find a message with this UID.
reason = "IMAP server '%s' does not have a message " \
"with UID '%s'" % (self.getrepository(), uids)
raise OfflineImapError(reason, severity)
# Convert bytes to str
ndata0 = data[0][0].decode('utf-8')
ndata1 = data[0][1].decode('utf-8', errors='replace')
ndata = [ndata0, ndata1]
return ndata
def _store_to_imap(self, imapobj, uid, field, data):
"""Stores data to IMAP server
Arguments:
- imapobj: instance of IMAPlib to use
- uid: message UID
- field: field name to be stored/updated
- data: field contents
"""
imapobj.select(self.getfullIMAPname())
res_type, retdata = imapobj.uid('store', uid, field, data)
if res_type != 'OK':
severity = OfflineImapError.ERROR.MESSAGE
reason = "IMAP server '%s' failed to store %s " \
"for message UID '%d'." \
"Server responded: %s %s" % (
self.getrepository(), field, uid, res_type, retdata)
raise OfflineImapError(reason, severity)
return retdata[0]
# Interface from BaseFolder
def savemessageflags(self, uid, flags):
"""Change a message's flags to `flags`.
Note that this function does not check against dryrun settings,
so you need to ensure that it is never called in a
dryrun mode."""
imapobj = self.imapserver.acquireconnection()
try:
result = self._store_to_imap(imapobj, str(uid), 'FLAGS',
imaputil.flagsmaildir2imap(flags))
except imapobj.readonly:
self.ui.flagstoreadonly(self, [uid], flags)
return
finally:
self.imapserver.releaseconnection(imapobj)
if not result:
self.messagelist[uid]['flags'] = flags
else:
flags = imaputil.flags2hash(imaputil.imapsplit(result)[1])['FLAGS']
self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(flags)
# Interface from BaseFolder
def addmessageflags(self, uid, flags):
self.addmessagesflags([uid], flags)
def __addmessagesflags_noconvert(self, uidlist, flags):
self.__processmessagesflags('+', uidlist, flags)
# Interface from BaseFolder
def addmessagesflags(self, uidlist, flags):
"""This is here for the sake of UIDMaps.py -- deletemessages must
add flags and get a converted UID, and if we don't have noconvert,
then UIDMaps will try to convert it twice."""
self.__addmessagesflags_noconvert(uidlist, flags)
# Interface from BaseFolder
def deletemessageflags(self, uid, flags):
self.deletemessagesflags([uid], flags)
# Interface from BaseFolder
def deletemessagesflags(self, uidlist, flags):
self.__processmessagesflags('-', uidlist, flags)
def __processmessagesflags_real(self, operation, uidlist, flags):
imapobj = self.imapserver.acquireconnection()
try:
try:
imapobj.select(self.getfullIMAPname())
except imapobj.readonly:
self.ui.flagstoreadonly(self, uidlist, flags)
return
response = imapobj.uid('store',
imaputil.uid_sequence(uidlist),
operation + 'FLAGS',
imaputil.flagsmaildir2imap(flags))
if response[0] != 'OK':
raise OfflineImapError(
'Error with store: %s' % '. '.join(response[1]),
OfflineImapError.ERROR.MESSAGE)
response = response[1]
finally:
self.imapserver.releaseconnection(imapobj)
# Some IMAP servers do not always return a result. Therefore,
# only update the ones that it talks about, and manually fix
# the others.
needupdate = list(uidlist)
for result in response:
if result is None:
# Compensate for servers that don't return anything from
# STORE.
continue
attributehash = imaputil.flags2hash(imaputil.imapsplit(result)[1])
if not ('UID' in attributehash and 'FLAGS' in attributehash):
# Compensate for servers that don't return a UID attribute.
continue
flagstr = attributehash['FLAGS']
uid = int(attributehash['UID'])
self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(flagstr)
try: