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#21800: Add RFC 6855 support to imaplib. 

Original patch by Milan Oberkirch, updated by myself and
Maciej Szulik.
This commit is contained in:
R David Murray 2015-05-10 19:17:23 -04:00
parent 18c30a29f8
commit a6429db4b8
5 changed files with 179 additions and 21 deletions
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30
Doc/library/imaplib.rst
View File

@ -77,7 +77,8 @@ Three exceptions are defined as attributes of the :class:`IMAP4` class:
There's also a subclass for secure connections:
.. class:: IMAP4_SSL(host='', port=IMAP4_SSL_PORT, keyfile=None, certfile=None, ssl_context=None)
.. class:: IMAP4_SSL(host='', port=IMAP4_SSL_PORT, keyfile=None, \
certfile=None, ssl_context=None)
This is a subclass derived from :class:`IMAP4` that connects over an SSL
encrypted socket (to use this class you need a socket module that was compiled
@ -211,6 +212,10 @@ An :class:`IMAP4` instance has the following methods:
that will be base64 encoded and sent to the server. It should return
``None`` if the client abort response ``*`` should be sent instead.
.. versionchanged:: 3.5
string usernames and passwords are now encoded to ``utf-8`` instead of
being limited to ASCII.
.. method:: IMAP4.check()
@ -243,6 +248,16 @@ An :class:`IMAP4` instance has the following methods:
Delete the ACLs (remove any rights) set for who on mailbox.
.. method:: IMAP4.enable(capability)
Enable *capability* (see :rfc:`5161`). Most capabilities do not need to be
enabled. Currently only the ``UTF8=ACCEPT`` capability is supported
(see :RFC:`6855`).
.. versionadded:: 3.5
The :meth:`enable` method itself, and :RFC:`6855` support.
.. method:: IMAP4.expunge()
Permanently remove deleted items from selected mailbox. Generates an ``EXPUNGE``
@ -380,7 +395,9 @@ An :class:`IMAP4` instance has the following methods:
Search mailbox for matching messages. *charset* may be ``None``, in which case
no ``CHARSET`` will be specified in the request to the server. The IMAP
protocol requires that at least one criterion be specified; an exception will be
raised when the server returns an error.
raised when the server returns an error. *charset* must be ``None`` if
the ``UTF8=ACCEPT`` capability was enabled using the :meth:`enable`
command.
Example::
@ -542,6 +559,15 @@ The following attributes are defined on instances of :class:`IMAP4`:
the module variable ``Debug``. Values greater than three trace each command.
.. attribute:: IMAP4.utf8_enabled
Boolean value that is normally ``False``, but is set to ``True`` if an
:meth:`enable` command is successfully issued for the ``UTF8=ACCEPT``
capability.
.. versionadded:: 3.5
.. _imap4-example:
IMAP4 Example

11
Doc/whatsnew/3.5.rst
View File

@ -337,6 +337,17 @@ imaplib
automatically at the end of the block. (Contributed by Tarek Ziadé and
Serhiy Storchaka in :issue:`4972`.)
* :mod:`imaplib` now supports :rfc:`5161`: the :meth:`~imaplib.IMAP4.enable`
extension), and :rfc:`6855`: utf-8 support (internationalized email, via the
``UTF8=ACCEPT`` argument to :meth:`~imaplib.IMAP4.enable`). A new attribute,
:attr:`~imaplib.IMAP4.utf8_enabled`, tracks whether or not :rfc:`6855`
support is enabled. Milan Oberkirch, R. David Murray, and Maciej Szulik in
:issue:`21800`.)
* :mod:`imaplib` now automatically encodes non-ASCII string usernames and
passwords using ``UTF8``, as recommended by the RFCs. (Contributed by Milan
Oberkirch in :issue:`21800`.)
imghdr
------

77
Lib/imaplib.py
View File

@ -66,6 +66,7 @@ Commands = {
'CREATE': ('AUTH', 'SELECTED'),
'DELETE': ('AUTH', 'SELECTED'),
'DELETEACL': ('AUTH', 'SELECTED'),
'ENABLE': ('AUTH', ),
'EXAMINE': ('AUTH', 'SELECTED'),
'EXPUNGE': ('SELECTED',),
'FETCH': ('SELECTED',),
@ -107,12 +108,17 @@ InternalDate = re.compile(br'.*INTERNALDATE "'
br' (?P<hour>[0-9][0-9]):(?P<min>[0-9][0-9]):(?P<sec>[0-9][0-9])'
br' (?P<zonen>[-+])(?P<zoneh>[0-9][0-9])(?P<zonem>[0-9][0-9])'
br'"')
# Literal is no longer used; kept for backward compatibility.
Literal = re.compile(br'.*{(?P<size>\d+)}$', re.ASCII)
MapCRLF = re.compile(br'\r\n|\r|\n')
Response_code = re.compile(br'\[(?P<type>[A-Z-]+)( (?P<data>[^\]]*))?\]')
Untagged_response = re.compile(br'\* (?P<type>[A-Z-]+)( (?P<data>.*))?')
# Untagged_status is no longer used; kept for backward compatibility
Untagged_status = re.compile(
br'\* (?P<data>\d+) (?P<type>[A-Z-]+)( (?P<data2>.*))?', re.ASCII)
# We compile these in _mode_xxx.
_Literal = br'.*{(?P<size>\d+)}$'
_Untagged_status = br'\* (?P<data>\d+) (?P<type>[A-Z-]+)( (?P<data2>.*))?'
@ -166,7 +172,7 @@ class IMAP4:
class abort(error): pass # Service errors - close and retry
class readonly(abort): pass # Mailbox status changed to READ-ONLY
def __init__(self, host = '', port = IMAP4_PORT):
def __init__(self, host='', port=IMAP4_PORT):
self.debug = Debug
self.state = 'LOGOUT'
self.literal = None # A literal argument to a command
@ -176,6 +182,7 @@ class IMAP4:
self.is_readonly = False # READ-ONLY desired state
self.tagnum = 0
self._tls_established = False
self._mode_ascii()
# Open socket to server.
@ -190,6 +197,19 @@ class IMAP4:
pass
raise
def _mode_ascii(self):
self.utf8_enabled = False
self._encoding = 'ascii'
self.Literal = re.compile(_Literal, re.ASCII)
self.Untagged_status = re.compile(_Untagged_status, re.ASCII)
def _mode_utf8(self):
self.utf8_enabled = True
self._encoding = 'utf-8'
self.Literal = re.compile(_Literal)
self.Untagged_status = re.compile(_Untagged_status)
def _connect(self):
# Create unique tag for this session,
@ -360,7 +380,10 @@ class IMAP4:
date_time = Time2Internaldate(date_time)
else:
date_time = None
self.literal = MapCRLF.sub(CRLF, message)
literal = MapCRLF.sub(CRLF, message)
if self.utf8_enabled:
literal = b'UTF8 (' + literal + b')'
self.literal = literal
return self._simple_command(name, mailbox, flags, date_time)
@ -455,6 +478,18 @@ class IMAP4:
"""
return self._simple_command('DELETEACL', mailbox, who)
def enable(self, capability):
"""Send an RFC5161 enable string to the server.
(typ, [data]) = <intance>.enable(capability)
"""
if 'ENABLE' not in self.capabilities:
raise IMAP4.error("Server does not support ENABLE")
typ, data = self._simple_command('ENABLE', capability)
if typ == 'OK' and 'UTF8=ACCEPT' in capability.upper():
self._mode_utf8()
return typ, data
def expunge(self):
"""Permanently remove deleted items from selected mailbox.
@ -561,7 +596,7 @@ class IMAP4:
def _CRAM_MD5_AUTH(self, challenge):
""" Authobject to use with CRAM-MD5 authentication. """
import hmac
pwd = (self.password.encode('ASCII') if isinstance(self.password, str)
pwd = (self.password.encode('utf-8') if isinstance(self.password, str)
else self.password)
return self.user + " " + hmac.HMAC(pwd, challenge, 'md5').hexdigest()
@ -661,9 +696,12 @@ class IMAP4:
(typ, [data]) = <instance>.search(charset, criterion, ...)
'data' is space separated list of matching message numbers.
If UTF8 is enabled, charset MUST be None.
"""
name = 'SEARCH'
if charset:
if self.utf8_enabled:
raise IMAP4.error("Non-None charset not valid in UTF8 mode")
typ, dat = self._simple_command(name, 'CHARSET', charset, *criteria)
else:
typ, dat = self._simple_command(name, *criteria)
@ -877,7 +915,7 @@ class IMAP4:
def _check_bye(self):
bye = self.untagged_responses.get('BYE')
if bye:
raise self.abort(bye[-1].decode('ascii', 'replace'))
raise self.abort(bye[-1].decode(self._encoding, 'replace'))
def _command(self, name, *args):
@ -898,12 +936,12 @@ class IMAP4:
raise self.readonly('mailbox status changed to READ-ONLY')
tag = self._new_tag()
name = bytes(name, 'ASCII')
name = bytes(name, self._encoding)
data = tag + b' ' + name
for arg in args:
if arg is None: continue
if isinstance(arg, str):
arg = bytes(arg, "ASCII")
arg = bytes(arg, self._encoding)
data = data + b' ' + arg
literal = self.literal
@ -913,7 +951,7 @@ class IMAP4:
literator = literal
else:
literator = None
data = data + bytes(' {%s}' % len(literal), 'ASCII')
data = data + bytes(' {%s}' % len(literal), self._encoding)
if __debug__:
if self.debug >= 4:
@ -978,7 +1016,7 @@ class IMAP4:
typ, dat = self.capability()
if dat == [None]:
raise self.error('no CAPABILITY response from server')
dat = str(dat[-1], "ASCII")
dat = str(dat[-1], self._encoding)
dat = dat.upper()
self.capabilities = tuple(dat.split())
@ -997,10 +1035,10 @@ class IMAP4:
if self._match(self.tagre, resp):
tag = self.mo.group('tag')
if not tag in self.tagged_commands:
raise self.abort('unexpected tagged response: %s' % resp)
raise self.abort('unexpected tagged response: %r' % resp)
typ = self.mo.group('type')
typ = str(typ, 'ASCII')
typ = str(typ, self._encoding)
dat = self.mo.group('data')
self.tagged_commands[tag] = (typ, [dat])
else:
@ -1009,7 +1047,7 @@ class IMAP4:
# '*' (untagged) responses?
if not self._match(Untagged_response, resp):
if self._match(Untagged_status, resp):
if self._match(self.Untagged_status, resp):
dat2 = self.mo.group('data2')
if self.mo is None:
@ -1019,17 +1057,17 @@ class IMAP4:
self.continuation_response = self.mo.group('data')
return None # NB: indicates continuation
raise self.abort("unexpected response: '%s'" % resp)
raise self.abort("unexpected response: %r" % resp)
typ = self.mo.group('type')
typ = str(typ, 'ascii')
typ = str(typ, self._encoding)
dat = self.mo.group('data')
if dat is None: dat = b'' # Null untagged response
if dat2: dat = dat + b' ' + dat2
# Is there a literal to come?
while self._match(Literal, dat):
while self._match(self.Literal, dat):
# Read literal direct from connection.
@ -1053,7 +1091,7 @@ class IMAP4:
if typ in ('OK', 'NO', 'BAD') and self._match(Response_code, dat):
typ = self.mo.group('type')
typ = str(typ, "ASCII")
typ = str(typ, self._encoding)
self._append_untagged(typ, self.mo.group('data'))
if __debug__:
@ -1123,7 +1161,7 @@ class IMAP4:
def _new_tag(self):
tag = self.tagpre + bytes(str(self.tagnum), 'ASCII')
tag = self.tagpre + bytes(str(self.tagnum), self._encoding)
self.tagnum = self.tagnum + 1
self.tagged_commands[tag] = None
return tag
@ -1213,7 +1251,8 @@ if HAVE_SSL:
"""
def __init__(self, host='', port=IMAP4_SSL_PORT, keyfile=None, certfile=None, ssl_context=None):
def __init__(self, host='', port=IMAP4_SSL_PORT, keyfile=None,
certfile=None, ssl_context=None):
if ssl_context is not None and keyfile is not None:
raise ValueError("ssl_context and keyfile arguments are mutually "
"exclusive")
@ -1251,7 +1290,7 @@ class IMAP4_stream(IMAP4):
Instantiate with: IMAP4_stream(command)
where "command" is a string that can be passed to subprocess.Popen()
"command" - a string that can be passed to subprocess.Popen()
for more documentation see the docstring of the parent class IMAP4.
"""
@ -1328,7 +1367,7 @@ class _Authenticator:
#
oup = b''
if isinstance(inp, str):
inp = inp.encode('ASCII')
inp = inp.encode('utf-8')
while inp:
if len(inp) > 48:
t = inp[:48]

78
Lib/test/test_imaplib.py
View File

@ -265,6 +265,84 @@ class ThreadedNetworkedTests(unittest.TestCase):
self.assertRaises(imaplib.IMAP4.abort,
self.imap_class, *server.server_address)
class UTF8Server(SimpleIMAPHandler):
capabilities = 'AUTH ENABLE UTF8=ACCEPT'
def cmd_ENABLE(self, tag, args):
self._send_tagged(tag, 'OK', 'ENABLE successful')
def cmd_AUTHENTICATE(self, tag, args):
self._send_textline('+')
self.server.response = yield
self._send_tagged(tag, 'OK', 'FAKEAUTH successful')
@reap_threads
def test_enable_raises_error_if_not_AUTH(self):
with self.reaped_pair(self.UTF8Server) as (server, client):
self.assertFalse(client.utf8_enabled)
self.assertRaises(imaplib.IMAP4.error, client.enable, 'foo')
self.assertFalse(client.utf8_enabled)
# XXX Also need a test that enable after SELECT raises an error.
@reap_threads
def test_enable_raises_error_if_no_capability(self):
class NoEnableServer(self.UTF8Server):
capabilities = 'AUTH'
with self.reaped_pair(NoEnableServer) as (server, client):
self.assertRaises(imaplib.IMAP4.error, client.enable, 'foo')
@reap_threads
def test_enable_UTF8_raises_error_if_not_supported(self):
class NonUTF8Server(SimpleIMAPHandler):
pass
with self.assertRaises(imaplib.IMAP4.error):
with self.reaped_pair(NonUTF8Server) as (server, client):
typ, data = client.login('user', 'pass')
self.assertEqual(typ, 'OK')
client.enable('UTF8=ACCEPT')
pass
@reap_threads
def test_enable_UTF8_True_append(self):
class UTF8AppendServer(self.UTF8Server):
def cmd_APPEND(self, tag, args):
self._send_textline('+')
self.server.response = yield
self._send_tagged(tag, 'OK', 'okay')
with self.reaped_pair(UTF8AppendServer) as (server, client):
self.assertEqual(client._encoding, 'ascii')
code, _ = client.authenticate('MYAUTH', lambda x: b'fake')
self.assertEqual(code, 'OK')
self.assertEqual(server.response,
b'ZmFrZQ==\r\n') # b64 encoded 'fake'
code, _ = client.enable('UTF8=ACCEPT')
self.assertEqual(code, 'OK')
self.assertEqual(client._encoding, 'utf-8')
msg_string = 'Subject: üñí©öðé'
typ, data = client.append(
None, None, None, msg_string.encode('utf-8'))
self.assertEqual(typ, 'OK')
self.assertEqual(
server.response,
('UTF8 (%s)\r\n' % msg_string).encode('utf-8')
)
# XXX also need a test that makes sure that the Literal and Untagged_status
# regexes uses unicode in UTF8 mode instead of the default ASCII.
@reap_threads
def test_search_disallows_charset_in_utf8_mode(self):
with self.reaped_pair(self.UTF8Server) as (server, client):
typ, _ = client.authenticate('MYAUTH', lambda x: b'fake')
self.assertEqual(typ, 'OK')
typ, _ = client.enable('UTF8=ACCEPT')
self.assertEqual(typ, 'OK')
self.assertTrue(client.utf8_enabled)
self.assertRaises(imaplib.IMAP4.error, client.search, 'foo', 'bar')
@reap_threads
def test_bad_auth_name(self):

4
Misc/NEWS
View File

@ -38,6 +38,10 @@ Core and Builtins
Library
-------
- Issue #21800: imaplib now supports RFC 5161 (enable), RFC 6855
(utf8/internationalized email) and automatically encodes non-ASCII
usernames and passwords to UTF8.
- Issue #24134: assertRaises(), assertRaisesRegex(), assertWarns() and
assertWarnsRegex() checks are not longer successful if the callable is None.