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|
"""IMAP4 client.
Based on RFC 2060.
Author: Piers Lauder <piers@cs.su.oz.au> December 1997.
Public class: IMAP4
Public variable: Debug
Public functions: Internaldate2tuple
Int2AP
ParseFlags
Time2Internaldate
"""
import re, socket, string, time, random
# Globals
CRLF = '\r\n'
Debug = 0
IMAP4_PORT = 143
AllowedVersions = ('IMAP4REV1', 'IMAP4') # Most recent first
# Commands
Commands = {
# name valid states
'APPEND': ('AUTH', 'SELECTED'),
'AUTHENTICATE': ('NONAUTH',),
'CAPABILITY': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
'CHECK': ('SELECTED',),
'CLOSE': ('SELECTED',),
'COPY': ('SELECTED',),
'CREATE': ('AUTH', 'SELECTED'),
'DELETE': ('AUTH', 'SELECTED'),
'EXAMINE': ('AUTH', 'SELECTED'),
'EXPUNGE': ('SELECTED',),
'FETCH': ('SELECTED',),
'LIST': ('AUTH', 'SELECTED'),
'LOGIN': ('NONAUTH',),
'LOGOUT': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
'LSUB': ('AUTH', 'SELECTED'),
'NOOP': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
'RENAME': ('AUTH', 'SELECTED'),
'SEARCH': ('SELECTED',),
'SELECT': ('AUTH', 'SELECTED'),
'STATUS': ('AUTH', 'SELECTED'),
'STORE': ('SELECTED',),
'SUBSCRIBE': ('AUTH', 'SELECTED'),
'UID': ('SELECTED',),
'UNSUBSCRIBE': ('AUTH', 'SELECTED'),
}
# Patterns to match server responses
Continuation = re.compile(r'\+ (?P<data>.*)')
Flags = re.compile(r'.*FLAGS \((?P<flags>[^\)]*)\)')
InternalDate = re.compile(r'.*INTERNALDATE "'
r'(?P<day>[ 123][0-9])-(?P<mon>[A-Z][a-z][a-z])-(?P<year>[0-9][0-9][0-9][0-9])'
r' (?P<hour>[0-9][0-9]):(?P<min>[0-9][0-9]):(?P<sec>[0-9][0-9])'
r' (?P<zonen>[-+])(?P<zoneh>[0-9][0-9])(?P<zonem>[0-9][0-9])'
r'"')
Literal = re.compile(r'(?P<data>.*) {(?P<size>\d+)}$')
Response_code = re.compile(r'\[(?P<type>[A-Z-]+)( (?P<data>[^\]]*))?\]')
Untagged_response = re.compile(r'\* (?P<type>[A-Z-]+) (?P<data>.*)')
Untagged_status = re.compile(r'\* (?P<data>\d+) (?P<type>[A-Z-]+)( (?P<data2>.*))?')
class IMAP4:
"""IMAP4 client class.
Instantiate with: IMAP4([host[, port]])
host - host's name (default: localhost);
port - port number (default: standard IMAP4 port).
All IMAP4rev1 commands are supported by methods of the same
name (in lower-case). Each command returns a tuple: (type, [data, ...])
where 'type' is usually 'OK' or 'NO', and 'data' is either the
text from the tagged response, or untagged results from command.
Errors raise the exception class <instance>.error("<reason>").
IMAP4 server errors raise <instance>.abort("<reason>"),
which is a sub-class of 'error'.
"""
class error(Exception): pass # Logical errors - debug required
class abort(error): pass # Service errors - close and retry
def __init__(self, host = '', port = IMAP4_PORT):
self.host = host
self.port = port
self.debug = Debug
self.state = 'LOGOUT'
self.tagged_commands = {} # Tagged commands awaiting response
self.untagged_responses = {} # {typ: [data, ...], ...}
self.continuation_response = '' # Last continuation response
self.tagnum = 0
# Open socket to server.
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.connect(self.host, self.port)
self.file = self.sock.makefile('r')
# Create unique tag for this session,
# and compile tagged response matcher.
self.tagpre = Int2AP(random.random()*32000)
self.tagre = re.compile(r'(?P<tag>'
+ self.tagpre
+ r'\d+) (?P<type>[A-Z]+) (?P<data>.*)')
# Get server welcome message,
# request and store CAPABILITY response.
if __debug__ and self.debug >= 1:
print '\tnew IMAP4 connection, tag=%s' % self.tagpre
self.welcome = self._get_response()
if self.untagged_responses.has_key('PREAUTH'):
self.state = 'AUTH'
elif self.untagged_responses.has_key('OK'):
self.state = 'NONAUTH'
# elif self.untagged_responses.has_key('BYE'):
else:
raise self.error(self.welcome)
cap = 'CAPABILITY'
self._simple_command(cap)
if not self.untagged_responses.has_key(cap):
raise self.error('no CAPABILITY response from server')
self.capabilities = tuple(string.split(self.untagged_responses[cap][-1]))
if __debug__ and self.debug >= 3:
print '\tCAPABILITIES: %s' % `self.capabilities`
self.PROTOCOL_VERSION = None
for version in AllowedVersions:
if not version in self.capabilities:
continue
self.PROTOCOL_VERSION = version
break
if not self.PROTOCOL_VERSION:
raise self.error('server not IMAP4 compliant')
def __getattr__(self, attr):
"""Allow UPPERCASE variants of all following IMAP4 commands."""
if Commands.has_key(attr):
return eval("self.%s" % string.lower(attr))
raise AttributeError("Unknown IMAP4 command: '%s'" % attr)
# Public methods
def append(self, mailbox, flags, date_time, message):
"""Append message to named mailbox.
(typ, [data]) = <instance>.append(mailbox, flags, date_time, message)
"""
name = 'APPEND'
if flags:
flags = '(%s)' % flags
else:
flags = None
if date_time:
date_time = Time2Internaldate(date_time)
else:
date_time = None
return self._simple_command(name, mailbox, flags, date_time, message)
def authenticate(self, func):
"""Authenticate command - requires response processing.
UNIMPLEMENTED
"""
raise self.error('UNIMPLEMENTED')
def check(self):
"""Checkpoint mailbox on server.
(typ, [data]) = <instance>.check()
"""
return self._simple_command('CHECK')
def close(self):
"""Close currently selected mailbox.
Deleted messages are removed from writable mailbox.
This is the recommended command before 'LOGOUT'.
(typ, [data]) = <instance>.close()
"""
try:
try: typ, dat = self._simple_command('CLOSE')
except EOFError: typ, dat = None, [None]
finally:
self.state = 'AUTH'
return typ, dat
def copy(self, message_set, new_mailbox):
"""Copy 'message_set' messages onto end of 'new_mailbox'.
(typ, [data]) = <instance>.copy(message_set, new_mailbox)
"""
return self._simple_command('COPY', message_set, new_mailbox)
def create(self, mailbox):
"""Create new mailbox.
(typ, [data]) = <instance>.create(mailbox)
"""
return self._simple_command('CREATE', mailbox)
def delete(self, mailbox):
"""Delete old mailbox.
(typ, [data]) = <instance>.delete(mailbox)
"""
return self._simple_command('DELETE', mailbox)
def expunge(self):
"""Permanently remove deleted items from selected mailbox.
Generates 'EXPUNGE' response for each deleted message.
(typ, [data]) = <instance>.expunge()
'data' is list of 'EXPUNGE'd message numbers in order received.
"""
name = 'EXPUNGE'
typ, dat = self._simple_command(name)
return self._untagged_response(typ, name)
def fetch(self, message_set, message_parts):
"""Fetch (parts of) messages.
(typ, [data, ...]) = <instance>.fetch(message_set, message_parts)
'data' are tuples of message part envelope and data.
"""
name = 'FETCH'
typ, dat = self._simple_command(name, message_set, message_parts)
return self._untagged_response(typ, name)
def list(self, directory='""', pattern='*'):
"""List mailbox names in directory matching pattern.
(typ, [data]) = <instance>.list(directory='""', pattern='*')
'data' is list of LIST responses.
"""
name = 'LIST'
typ, dat = self._simple_command(name, directory, pattern)
return self._untagged_response(typ, name)
def login(self, user, password):
"""Identify client using plaintext password.
(typ, [data]) = <instance>.list(user, password)
"""
typ, dat = self._simple_command('LOGIN', user, password)
if typ != 'OK':
raise self.error(dat)
self.state = 'AUTH'
return typ, dat
def logout(self):
"""Shutdown connection to server.
(typ, [data]) = <instance>.logout()
Returns server 'BYE' response.
"""
self.state = 'LOGOUT'
try: typ, dat = self._simple_command('LOGOUT')
except EOFError: typ, dat = None, [None]
self.file.close()
self.sock.close()
if self.untagged_responses.has_key('BYE'):
return 'BYE', self.untagged_responses['BYE']
return typ, dat
def lsub(self, directory='""', pattern='*'):
"""List 'subscribed' mailbox names in directory matching pattern.
(typ, [data, ...]) = <instance>.lsub(directory='""', pattern='*')
'data' are tuples of message part envelope and data.
"""
name = 'LSUB'
typ, dat = self._simple_command(name, directory, pattern)
return self._untagged_response(typ, name)
def recent(self):
"""Prompt server for an update.
Flush all untagged responses.
(typ, [data]) = <instance>.recent()
'data' is None if no new messages,
else value of RECENT response.
"""
name = 'RECENT'
typ, dat = self._untagged_response('OK', name)
if dat[-1]:
return typ, dat
self.untagged_responses = {}
typ, dat = self._simple_command('NOOP')
return self._untagged_response(typ, name)
def rename(self, oldmailbox, newmailbox):
"""Rename old mailbox name to new.
(typ, data) = <instance>.rename(oldmailbox, newmailbox)
"""
return self._simple_command('RENAME', oldmailbox, newmailbox)
def response(self, code):
"""Return data for response 'code' if received, or None.
Old value for response 'code' is cleared.
(code, [data]) = <instance>.response(code)
"""
return self._untagged_response(code, code)
def search(self, charset, criteria):
"""Search mailbox for matching messages.
(typ, [data]) = <instance>.search(charset, criteria)
'data' is space separated list of matching message numbers.
"""
name = 'SEARCH'
if charset:
charset = 'CHARSET ' + charset
typ, dat = self._simple_command(name, charset, criteria)
return self._untagged_response(typ, name)
def select(self, mailbox='INBOX', readonly=None):
"""Select a mailbox.
Flush all untagged responses.
(typ, [data]) = <instance>.select(mailbox='INBOX', readonly=None)
'data' is count of messages in mailbox ('EXISTS' response).
"""
# Mandated responses are ('FLAGS', 'EXISTS', 'RECENT', 'UIDVALIDITY')
self.untagged_responses = {} # Flush old responses.
if readonly:
name = 'EXAMINE'
else:
name = 'SELECT'
typ, dat = self._simple_command(name, mailbox)
if typ == 'OK':
self.state = 'SELECTED'
elif typ == 'NO':
self.state = 'AUTH'
if not readonly and not self.untagged_responses.has_key('READ-WRITE'):
raise self.error('%s is not writable' % mailbox)
return typ, self.untagged_responses.get('EXISTS', [None])
def status(self, mailbox, names):
"""Request named status conditions for mailbox.
(typ, [data]) = <instance>.status(mailbox, names)
"""
name = 'STATUS'
if self.PROTOCOL_VERSION == 'IMAP4':
raise self.error('%s unimplemented in IMAP4 (obtain IMAP4rev1 server, or re-code)' % name)
typ, dat = self._simple_command(name, mailbox, names)
return self._untagged_response(typ, name)
def store(self, message_set, command, flag_list):
"""Alters flag dispositions for messages in mailbox.
(typ, [data]) = <instance>.store(message_set, command, flag_list)
"""
typ, dat = self._simple_command('STORE', message_set, command, flag_list)
return self._untagged_response(typ, 'FETCH')
def subscribe(self, mailbox):
"""Subscribe to new mailbox.
(typ, [data]) = <instance>.subscribe(mailbox)
"""
return self._simple_command('SUBSCRIBE', mailbox)
def uid(self, command, *args):
"""Execute "command arg ..." with messages identified by UID,
rather than message number.
(typ, [data]) = <instance>.uid(command, arg1, arg2, ...)
Returns response appropriate to 'command'.
"""
name = 'UID'
typ, dat = apply(self._simple_command, ('UID', command) + args)
if command == 'SEARCH':
name = 'SEARCH'
else:
name = 'FETCH'
typ, dat2 = self._untagged_response(typ, name)
if dat2[-1]: dat = dat2
return typ, dat
def unsubscribe(self, mailbox):
"""Unsubscribe from old mailbox.
(typ, [data]) = <instance>.unsubscribe(mailbox)
"""
return self._simple_command('UNSUBSCRIBE', mailbox)
def xatom(self, name, *args):
"""Allow simple extension commands
notified by server in CAPABILITY response.
(typ, [data]) = <instance>.xatom(name, arg, ...)
"""
if name[0] != 'X' or not name in self.capabilities:
raise self.error('unknown extension command: %s' % name)
return apply(self._simple_command, (name,) + args)
# Private methods
def _append_untagged(self, typ, dat):
if self.untagged_responses.has_key(typ):
self.untagged_responses[typ].append(dat)
else:
self.untagged_responses[typ] = [dat]
if __debug__ and self.debug >= 5:
print '\tuntagged_responses[%s] += %.20s..' % (typ, `dat`)
def _command(self, name, dat1=None, dat2=None, dat3=None, literal=None):
if self.state not in Commands[name]:
raise self.error(
'command %s illegal in state %s' % (name, self.state))
tag = self._new_tag()
data = '%s %s' % (tag, name)
for d in (dat1, dat2, dat3):
if d is None: continue
if type(d) is type(''):
l = len(string.split(d))
else:
l = 1
if l == 0 or l > 1 and (d[0],d[-1]) not in (('(',')'),('"','"')):
data = '%s "%s"' % (data, d)
else:
data = '%s %s' % (data, d)
if literal is not None:
data = '%s {%s}' % (data, len(literal))
try:
self.sock.send('%s%s' % (data, CRLF))
except socket.error, val:
raise self.abort('socket error: %s' % val)
if __debug__ and self.debug >= 4:
print '\t> %s' % data
if literal is None:
return tag
# Wait for continuation response
while self._get_response():
if self.tagged_commands[tag]: # BAD/NO?
return tag
# Send literal
if __debug__ and self.debug >= 4:
print '\twrite literal size %s' % len(literal)
try:
self.sock.send(literal)
self.sock.send(CRLF)
except socket.error, val:
raise self.abort('socket error: %s' % val)
return tag
def _command_complete(self, name, tag):
try:
typ, data = self._get_tagged_response(tag)
except self.abort, val:
raise self.abort('command: %s => %s' % (name, val))
except self.error, val:
raise self.error('command: %s => %s' % (name, val))
if self.untagged_responses.has_key('BYE') and name != 'LOGOUT':
raise self.abort(self.untagged_responses['BYE'][-1])
if typ == 'BAD':
raise self.error('%s command error: %s %s' % (name, typ, data))
return typ, data
def _get_response(self):
# Read response and store.
#
# Returns None for continuation responses,
# otherwise first response line received.
resp = self._get_line()
# Command completion response?
if self._match(self.tagre, resp):
tag = self.mo.group('tag')
if not self.tagged_commands.has_key(tag):
raise self.abort('unexpected tagged response: %s' % resp)
typ = self.mo.group('type')
dat = self.mo.group('data')
self.tagged_commands[tag] = (typ, [dat])
else:
dat2 = None
# '*' (untagged) responses?
if not self._match(Untagged_response, resp):
if self._match(Untagged_status, resp):
dat2 = self.mo.group('data2')
if self.mo is None:
# Only other possibility is '+' (continuation) rsponse...
if self._match(Continuation, resp):
self.continuation_response = self.mo.group('data')
return None # NB: indicates continuation
raise self.abort('unexpected response: %s' % resp)
typ = self.mo.group('type')
dat = self.mo.group('data')
if dat2: dat = dat + ' ' + dat2
# Is there a literal to come?
while self._match(Literal, dat):
# Read literal direct from connection.
size = string.atoi(self.mo.group('size'))
if __debug__ and self.debug >= 4:
print '\tread literal size %s' % size
data = self.file.read(size)
# Store response with literal as tuple
self._append_untagged(typ, (dat, data))
# Read trailer - possibly containing another literal
dat = self._get_line()
self._append_untagged(typ, dat)
# Bracketed response information?
if typ in ('OK', 'NO', 'BAD') and self._match(Response_code, dat):
self._append_untagged(self.mo.group('type'), self.mo.group('data'))
return resp
def _get_tagged_response(self, tag):
while 1:
result = self.tagged_commands[tag]
if result is not None:
del self.tagged_commands[tag]
return result
self._get_response()
def _get_line(self):
line = self.file.readline()
if not line:
raise EOFError
# Protocol mandates all lines terminated by CRLF
line = line[:-2]
if __debug__ and self.debug >= 4:
print '\t< %s' % line
return line
def _match(self, cre, s):
# Run compiled regular expression match method on 's'.
# Save result, return success.
self.mo = cre.match(s)
if __debug__ and self.mo is not None and self.debug >= 5:
print "\tmatched r'%s' => %s" % (cre.pattern, `self.mo.groups()`)
return self.mo is not None
def _new_tag(self):
tag = '%s%s' % (self.tagpre, self.tagnum)
self.tagnum = self.tagnum + 1
self.tagged_commands[tag] = None
return tag
def _simple_command(self, name, *args):
return self._command_complete(name, apply(self._command, (name,) + args))
def _untagged_response(self, typ, name):
if not self.untagged_responses.has_key(name):
return typ, [None]
data = self.untagged_responses[name]
if __debug__ and self.debug >= 5:
print '\tuntagged_responses[%s] => %.20s..' % (name, `data`)
del self.untagged_responses[name]
return typ, data
Mon2num = {'Jan': 1, 'Feb': 2, 'Mar': 3, 'Apr': 4, 'May': 5, 'Jun': 6,
'Jul': 7, 'Aug': 8, 'Sep': 9, 'Oct': 10, 'Nov': 11, 'Dec': 12}
def Internaldate2tuple(resp):
"""Convert IMAP4 INTERNALDATE to UT.
Returns Python time module tuple.
"""
mo = InternalDate.match(resp)
if not mo:
return None
mon = Mon2num[mo.group('mon')]
zonen = mo.group('zonen')
for name in ('day', 'year', 'hour', 'min', 'sec', 'zoneh', 'zonem'):
exec "%s = string.atoi(mo.group('%s'))" % (name, name)
# INTERNALDATE timezone must be subtracted to get UT
zone = (zoneh*60 + zonem)*60
if zonen == '-':
zone = -zone
tt = (year, mon, day, hour, min, sec, -1, -1, -1)
utc = time.mktime(tt)
# Following is necessary because the time module has no 'mkgmtime'.
# 'mktime' assumes arg in local timezone, so adds timezone/altzone.
lt = time.localtime(utc)
if time.daylight and lt[-1]:
zone = zone + time.altzone
else:
zone = zone + time.timezone
return time.localtime(utc - zone)
def Int2AP(num):
"""Convert integer to A-P string representation."""
val = ''; AP = 'ABCDEFGHIJKLMNOP'
num = int(abs(num))
while num:
num, mod = divmod(num, 16)
val = AP[mod] + val
return val
def ParseFlags(resp):
"""Convert IMAP4 flags response to python tuple."""
mo = Flags.match(resp)
if not mo:
return ()
return tuple(string.split(mo.group('flags')))
def Time2Internaldate(date_time):
"""Convert 'date_time' to IMAP4 INTERNALDATE representation.
Return string in form: '"DD-Mmm-YYYY HH:MM:SS +HHMM"'
"""
dttype = type(date_time)
if dttype is type(1):
tt = time.localtime(date_time)
elif dttype is type(()):
tt = date_time
elif dttype is type(""):
return date_time # Assume in correct format
else: raise ValueError
dt = time.strftime("%d-%b-%Y %H:%M:%S", tt)
if dt[0] == '0':
dt = ' ' + dt[1:]
if time.daylight and tt[-1]:
zone = -time.altzone
else:
zone = -time.timezone
return '"' + dt + " %+02d%02d" % divmod(zone/60, 60) + '"'
if __debug__ and __name__ == '__main__':
import getpass
USER = getpass.getuser()
PASSWD = getpass.getpass()
test_seq1 = (
('login', (USER, PASSWD)),
('create', ('/tmp/xxx 1',)),
('rename', ('/tmp/xxx 1', '/tmp/yyy')),
('CREATE', ('/tmp/yyz 2',)),
('append', ('/tmp/yyz 2', None, None, 'From: anon@x.y.z\n\ndata...')),
('select', ('/tmp/yyz 2',)),
('uid', ('SEARCH', 'ALL')),
('fetch', ('1', '(INTERNALDATE RFC822)')),
('store', ('1', 'FLAGS', '(\Deleted)')),
('expunge', ()),
('recent', ()),
('close', ()),
)
test_seq2 = (
('select', ()),
('response',('UIDVALIDITY',)),
('uid', ('SEARCH', 'ALL')),
('response', ('EXISTS',)),
('recent', ()),
('logout', ()),
)
def run(cmd, args):
typ, dat = apply(eval('M.%s' % cmd), args)
print ' %s %s\n => %s %s' % (cmd, args, typ, dat)
return dat
Debug = 4
M = IMAP4()
print 'PROTOCOL_VERSION = %s' % M.PROTOCOL_VERSION
for cmd,args in test_seq1:
run(cmd, args)
for ml in run('list', ('/tmp/', 'yy%')):
mo = re.match(r'.*"([^"]+)"$', ml)
if mo: path = mo.group(1)
else: path = string.split(ml)[-1]
run('delete', (path,))
for cmd,args in test_seq2:
dat = run(cmd, args)
if (cmd,args) != ('uid', ('SEARCH', 'ALL')):
continue
uid = string.split(dat[0])[-1]
run('uid', ('FETCH', '%s' % uid,
'(FLAGS INTERNALDATE RFC822.SIZE RFC822.HEADER RFC822)'))
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