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96db608e4d
docker-offlineimap/offlineimap/folder/IMAP.py
Sebastian Spaeth 96db608e4d Remove convoluted assert statements 
The working horse of the savemessage() function, imaplib.append() was
hidden away in an assert statement. Pull the real functions out of the
asserts and simply assert on the return values. This looks less
convoluted and makes this easier to understand in my opinion.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
2011-03-05 18:02:10 +01:00

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# IMAP folder support
# Copyright (C) 2002-2007 John Goerzen
# <jgoerzen@complete.org>
#
# 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 imaplib
import rfc822
import random
import binascii
import re
import time
from StringIO import StringIO
from copy import copy
from Base import BaseFolder
from offlineimap import imaputil, imaplibutil
class IMAPFolder(BaseFolder):
def __init__(self, imapserver, name, visiblename, accountname, repository):
self.config = imapserver.config
self.expunge = repository.getexpunge()
self.name = imaputil.dequote(name)
self.root = None # imapserver.root
self.sep = imapserver.delim
self.imapserver = imapserver
self.messagelist = None
self.visiblename = visiblename
self.accountname = accountname
self.repository = repository
self.randomgenerator = random.Random()
BaseFolder.__init__(self)
#self.ui is set in BaseFolder
def selectro(self, imapobj):
"""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."""
try:
imapobj.select(self.getfullname())
except imapobj.readonly:
imapobj.select(self.getfullname(), readonly = 1)
def getaccountname(self):
return self.accountname
def suggeststhreads(self):
return 1
def waitforthread(self):
self.imapserver.connectionwait()
def getcopyinstancelimit(self):
return 'MSGCOPY_' + self.repository.getname()
def getvisiblename(self):
return self.visiblename
def getuidvalidity(self):
imapobj = self.imapserver.acquireconnection()
try:
# Primes untagged_responses
self.selectro(imapobj)
return long(imapobj.untagged_responses['UIDVALIDITY'][0])
finally:
self.imapserver.releaseconnection(imapobj)
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.
imapobj = self.imapserver.acquireconnection()
try:
# Primes untagged_responses
imapobj.select(self.getfullname(), readonly = 1, force = 1)
try:
# 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.
maxmsgid = 0
for msgid in imapobj.untagged_responses['EXISTS']:
maxmsgid = max(long(msgid), maxmsgid)
except KeyError:
return True
# Different number of messages than last time?
if maxmsgid != len(statusfolder.getmessagelist()):
return True
if maxmsgid < 1:
# No messages; return
return False
# Now, get the UID for the last message.
response = imapobj.fetch('%d' % maxmsgid, '(UID)')[1]
finally:
self.imapserver.releaseconnection(imapobj)
# Discard the message number.
messagestr = response[0].split(' ', 1)[1]
options = imaputil.flags2hash(messagestr)
if not options.has_key('UID'):
return True
uid = long(options['UID'])
saveduids = statusfolder.getmessagelist().keys()
saveduids.sort()
if uid != saveduids[-1]:
return True
return False
# TODO: Make this so that it can define a date that would be the oldest messages etc.
def cachemessagelist(self):
imapobj = self.imapserver.acquireconnection()
self.messagelist = {}
try:
# Primes untagged_responses
imapobj.select(self.getfullname(), readonly = 1, force = 1)
maxage = self.config.getdefaultint("Account " + self.accountname, "maxage", -1)
maxsize = self.config.getdefaultint("Account " + self.accountname, "maxsize", -1)
if (maxage != -1) | (maxsize != -1):
try:
search_condition = "(";
if(maxage != -1):
#find out what the oldest message is that we should look at
oldest_time_struct = time.gmtime(time.time() - (60*60*24*maxage))
#format this manually - otherwise locales could cause problems
monthnames_standard = ["Jan", "Feb", "Mar", "Apr", "May", \
"June", "July", "Aug", "Sep", "Oct", "Nov", "Dec"]
our_monthname = monthnames_standard[oldest_time_struct[1]-1]
daystr = "%(day)02d" % {'day' : oldest_time_struct[2]}
date_search_str = "SINCE " + daystr + "-" + our_monthname \
+ "-" + str(oldest_time_struct[0])
search_condition += date_search_str
if(maxsize != -1):
if(maxage != 1): #There are two conditions - add a space
search_condition += " "
search_condition += "SMALLER " + self.config.getdefault("Account " + self.accountname, "maxsize", -1)
search_condition += ")"
searchresult = imapobj.search(None, search_condition)
#result would come back seperated by space - to change into a fetch
#statement we need to change space to comma
messagesToFetch = searchresult[1][0].replace(" ", ",")
except KeyError:
return
if len(messagesToFetch) < 1:
# No messages; return
return
else:
try:
# 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.
maxmsgid = 0
for msgid in imapobj.untagged_responses['EXISTS']:
maxmsgid = max(long(msgid), maxmsgid)
messagesToFetch = '1:%d' % maxmsgid;
except KeyError:
return
if maxmsgid < 1:
#no messages; return
return
# Now, get the flags and UIDs for these.
# We could conceivably get rid of maxmsgid and just say
# '1:*' here.
response = imapobj.fetch(messagesToFetch, '(FLAGS UID)')[1]
finally:
self.imapserver.releaseconnection(imapobj)
for messagestr in response:
# Discard the message number.
messagestr = messagestr.split(' ', 1)[1]
options = imaputil.flags2hash(messagestr)
if not options.has_key('UID'):
self.ui.warn('No UID in message with options %s' %\
str(options),
minor = 1)
else:
uid = long(options['UID'])
flags = imaputil.flagsimap2maildir(options['FLAGS'])
rtime = imaplibutil.Internaldate2epoch(messagestr)
self.messagelist[uid] = {'uid': uid, 'flags': flags, 'time': rtime}
def getmessagelist(self):
return self.messagelist
def getmessage(self, uid):
imapobj = self.imapserver.acquireconnection()
try:
imapobj.select(self.getfullname(), readonly = 1)
initialresult = imapobj.uid('fetch', '%d' % uid, '(BODY.PEEK[])')
self.ui.debug('imap', 'Returned object from fetching %d: %s' % \
(uid, str(initialresult)))
return initialresult[1][0][1].replace("\r\n", "\n")
finally:
self.imapserver.releaseconnection(imapobj)
def getmessagetime(self, uid):
return self.messagelist[uid]['time']
def getmessageflags(self, uid):
return self.messagelist[uid]['flags']
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(content) & 0xffffffff ) + '-'
headervalue += str(self.randomgenerator.randint(0,9999999999))
return (headername, headervalue)
def savemessage_addheader(self, content, headername, headervalue):
self.ui.debug('imap',
'savemessage_addheader: called to add %s: %s' % (headername,
headervalue))
insertionpoint = content.find("\r\n")
self.ui.debug('imap', 'savemessage_addheader: insertionpoint = %d' % insertionpoint)
leader = content[0:insertionpoint]
self.ui.debug('imap', 'savemessage_addheader: leader = %s' % repr(leader))
if insertionpoint == 0 or insertionpoint == -1:
newline = ''
insertionpoint = 0
else:
newline = "\r\n"
newline += "%s: %s" % (headername, headervalue)
self.ui.debug('imap', 'savemessage_addheader: newline = ' + repr(newline))
trailer = content[insertionpoint:]
self.ui.debug('imap', 'savemessage_addheader: trailer = ' + repr(trailer))
return leader + newline + trailer
def savemessage_searchforheader(self, imapobj, headername, headervalue):
if imapobj.untagged_responses.has_key('APPENDUID'):
return long(imapobj.untagged_responses['APPENDUID'][-1].split(' ')[1])
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]
except imapobj.error, 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] == None:
raise ValueError, "While attempting to find UID for message with header %s, got wrong-sized matchinguids of %s" % (headername, str(matchinguids))
matchinguids.sort()
return long(matchinguids[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:
message = rfc822.Message(StringIO(content))
# parsedate returns a 9-tuple that can be passed directly to
# time.mktime(); Will be None if missing or not in a valid
# format. Note that indexes 6, 7, and 8 of the result tuple are
# not usable.
datetuple = rfc822.parsedate(message.getheader('Date'))
if datetuple is None:
#could not determine the date, use the local time.
return None
else:
#rtime is set, use that instead
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("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'}
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
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.
:param rtime: A timestamp to be
:returns: the UID of the new message as assigned by the
server. If the folder is read-only it will return 0."""
imapobj = self.imapserver.acquireconnection()
self.ui.debug('imap', 'savemessage: called')
try:
try:
imapobj.select(self.getfullname()) # Needed for search
except imapobj.readonly:
self.ui.msgtoreadonly(self, uid, content, flags)
# Return indicating message taken, but no UID assigned.
return 0
# get the date of the message file, so we can pass it to the server.
date = self.getmessageinternaldate(content, rtime)
self.ui.debug('imap', 'savemessage: using date %s' % date)
content = re.sub("(?<!\r)\n", "\r\n", content)
self.ui.debug('imap', 'savemessage: initial content is: ' + repr(content))
(headername, headervalue) = self.generate_randomheader(content)
ui.debug('imap', 'savemessage: new headers are: %s: %s' % \
(headername, headervalue))
content = self.savemessage_addheader(content, headername,
headervalue)
self.ui.debug('imap', 'savemessage: new content is: ' + repr(content))
self.ui.debug('imap', 'savemessage: new content length is ' + \
str(len(content)))
# TODO: append could raise a ValueError if the date is not in
# valid format...?
(typ,dat) = imapobj.append(self.getfullname(),
imaputil.flagsmaildir2imap(flags),
date, content)
assert(typ == 'OK')
# Checkpoint. Let it write out the messages, etc.
(typ,dat) = imapobj.check()
assert(typ == 'OK')
# Keep trying until we get the UID.
self.ui.debug('imap', 'savemessage: first attempt to get new UID')
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: first attempt to get new UID failed. Going to run a NOOP and try again.')
assert(imapobj.noop()[0] == 'OK')
uid = self.savemessage_searchforheader(imapobj, headername,
headervalue)
finally:
self.imapserver.releaseconnection(imapobj)
if uid: # avoid UID FETCH 0 crash happening later on
self.messagelist[uid] = {'uid': uid, 'flags': flags}
self.ui.debug('imap', 'savemessage: returning %d' % uid)
return uid
def savemessageflags(self, uid, flags):
imapobj = self.imapserver.acquireconnection()
try:
try:
imapobj.select(self.getfullname())
except imapobj.readonly:
self.ui.flagstoreadonly(self, [uid], flags)
return
result = imapobj.uid('store', '%d' % uid, 'FLAGS',
imaputil.flagsmaildir2imap(flags))
assert result[0] == 'OK', 'Error with store: ' + '. '.join(r[1])
finally:
self.imapserver.releaseconnection(imapobj)
result = result[1][0]
if not result:
self.messagelist[uid]['flags'] = flags
else:
flags = imaputil.flags2hash(imaputil.imapsplit(result)[1])['FLAGS']
self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(flags)
def addmessageflags(self, uid, flags):
self.addmessagesflags([uid], flags)
def addmessagesflags_noconvert(self, uidlist, flags):
self.processmessagesflags('+', uidlist, flags)
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)
def deletemessageflags(self, uid, flags):
self.deletemessagesflags([uid], flags)
def deletemessagesflags(self, uidlist, flags):
self.processmessagesflags('-', uidlist, flags)
def processmessagesflags(self, operation, uidlist, flags):
if len(uidlist) > 101:
# Hack for those IMAP ervers with a limited line length
self.processmessagesflags(operation, uidlist[:100], flags)
self.processmessagesflags(operation, uidlist[100:], flags)
return
imapobj = self.imapserver.acquireconnection()
try:
try:
imapobj.select(self.getfullname())
except imapobj.readonly:
self.ui.flagstoreadonly(self, uidlist, flags)
return
r = imapobj.uid('store',
imaputil.listjoin(uidlist),
operation + 'FLAGS',
imaputil.flagsmaildir2imap(flags))
assert r[0] == 'OK', 'Error with store: ' + '. '.join(r[1])
r = r[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 = copy(uidlist)
for result in r:
if result == 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
lflags = attributehash['FLAGS']
uid = long(attributehash['UID'])
self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(lflags)
try:
needupdate.remove(uid)
except ValueError: # Let it slide if it's not in the list
pass
for uid in needupdate:
if operation == '+':
for flag in flags:
if not flag in self.messagelist[uid]['flags']:
self.messagelist[uid]['flags'].append(flag)
self.messagelist[uid]['flags'].sort()
elif operation == '-':
for flag in flags:
if flag in self.messagelist[uid]['flags']:
self.messagelist[uid]['flags'].remove(flag)
def deletemessage(self, uid):
self.deletemessages_noconvert([uid])
def deletemessages(self, uidlist):
self.deletemessages_noconvert(uidlist)
def deletemessages_noconvert(self, uidlist):
# Weed out ones not in self.messagelist
uidlist = [uid for uid in uidlist if uid in self.messagelist]
if not len(uidlist):
return
self.addmessagesflags_noconvert(uidlist, ['T'])
imapobj = self.imapserver.acquireconnection()
try:
try:
imapobj.select(self.getfullname())
except imapobj.readonly:
self.ui.deletereadonly(self, uidlist)
return
if self.expunge:
assert(imapobj.expunge()[0] == 'OK')
finally:
self.imapserver.releaseconnection(imapobj)
for uid in uidlist:
del self.messagelist[uid]
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