imaplib.py

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"""IMAP4 client.

Based on RFC 2060.

Public class:           IMAP4
Public variable:        Debug
Public functions:       Internaldate2tuple
                        Int2AP
                        ParseFlags
                        Time2Internaldate
"""

# Author: Piers Lauder <[e-mail]> December 1997.
#
# Authentication code contributed by Donn Cave <[e-mail]> June 1998.
# String method conversion by ESR, February 2001.
# GET/SETACL contributed by Anthony Baxter <[e-mail]> April 2001.

__version__ = "2.49"

import binascii, re, socket, time, random, sys

__all__ = ["IMAP4", "Internaldate2tuple",
           "Int2AP", "ParseFlags", "Time2Internaldate"]

#       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',),
        'GETACL':       ('AUTH', 'SELECTED'),
        'LIST':         ('AUTH', 'SELECTED'),
        'LOGIN':        ('NONAUTH',),
        'LOGOUT':       ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
        'LSUB':         ('AUTH', 'SELECTED'),
        'NAMESPACE':    ('AUTH', 'SELECTED'),
        'NOOP':         ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
        'PARTIAL':      ('SELECTED',),
        'RENAME':       ('AUTH', 'SELECTED'),
        'SEARCH':       ('SELECTED',),
        'SELECT':       ('AUTH', 'SELECTED'),
        'SETACL':       ('AUTH', 'SELECTED'),
        'SORT':         ('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<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).

    All arguments to commands are converted to strings, except for
    AUTHENTICATE, and the last argument to APPEND which is passed as
    an IMAP4 literal.  If necessary (the string contains any
    non-printing characters or white-space and isn't enclosed with
    either parentheses or double quotes) each string is quoted.
    However, the 'password' argument to the LOGIN command is always
    quoted.  If you want to avoid having an argument string quoted
    (eg: the 'flags' argument to STORE) then enclose the string in
    parentheses (eg: "(\Deleted)").

    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'. Mailbox status changes
    from READ-WRITE to READ-ONLY raise the exception class
    <instance>.readonly("<reason>"), which is a sub-class of 'abort'.

    "error" exceptions imply a program error.
    "abort" exceptions imply the connection should be reset, and
            the command re-tried.
    "readonly" exceptions imply the command should be re-tried.

    Note: to use this module, you must read the RFCs pertaining
    to the IMAP4 protocol, as the semantics of the arguments to
    each IMAP4 command are left to the invoker, not to mention
    the results.
    """

    class error(Exception): pass    # Logical errors - debug required
    class abort(error): pass        # Service errors - close and retry
    class readonly(abort): pass     # Mailbox status changed to READ-ONLY

    mustquote = re.compile(r"[^\w!#$%&'*+,.:;<=>?^`|~-]")

    def __init__(self, host = '', port = IMAP4_PORT):
        self.host = host
        self.port = port
        self.debug = Debug
        self.state = 'LOGOUT'
        self.literal = None             # A literal argument to a command
        self.tagged_commands = {}       # Tagged commands awaiting response
        self.untagged_responses = {}    # {typ: [data, ...], ...}
        self.continuation_response = '' # Last continuation response
        self.is_readonly = None         # READ-ONLY desired state
        self.tagnum = 0

        # Open socket to server.

        self.open(host, port)

        # Create unique tag for this session,
        # and compile tagged response matcher.

        self.tagpre = Int2AP(random.randint(0, 31999))
        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__:
            if self.debug >= 1:
                _mesg('imaplib version %s' % __version__)
                _mesg('new 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'
        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(self.untagged_responses[cap][-1].upper().split())

        if __debug__:
            if self.debug >= 3:
                _mesg('CAPABILITIES: %s' % `self.capabilities`)

        for version in AllowedVersions:
            if not version in self.capabilities:
                continue
            self.PROTOCOL_VERSION = version
            return

        raise self.error('server not IMAP4 compliant')


    def __getattr__(self, attr):
        #       Allow UPPERCASE variants of IMAP4 command methods.
        if Commands.has_key(attr):
            return getattr(self, attr.lower())
        raise AttributeError("Unknown IMAP4 command: '%s'" % attr)



    #       Overridable methods


    def open(self, host, port):
        """Setup connection to remote server on "host:port".
        This connection will be used by the routines:
            read, readline, send, shutdown.
        """
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.connect((self.host, self.port))
        self.file = self.sock.makefile('rb')


    def read(self, size):
        """Read 'size' bytes from remote."""
        return self.file.read(size)


    def readline(self):
        """Read line from remote."""
        return self.file.readline()


    def send(self, data):
        """Send data to remote."""
        self.sock.sendall(data)

    def shutdown(self):
        """Close I/O established in "open"."""
        self.file.close()
        self.sock.close()


    def socket(self):
        """Return socket instance used to connect to IMAP4 server.

        socket = <instance>.socket()
        """
        return self.sock



    #       Utility methods


    def recent(self):
        """Return most recent 'RECENT' responses if any exist,
        else prompt server for an update using the 'NOOP' command.

        (typ, [data]) = <instance>.recent()

        'data' is None if no new messages,
        else list of RECENT responses, most recent last.
        """
        name = 'RECENT'
        typ, dat = self._untagged_response('OK', [None], name)
        if dat[-1]:
            return typ, dat
        typ, dat = self.noop()  # Prod server for response
        return self._untagged_response(typ, dat, name)


    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, [None], code.upper())



    #       IMAP4 commands


    def append(self, mailbox, flags, date_time, message):
        """Append message to named mailbox.

        (typ, [data]) = <instance>.append(mailbox, flags, date_time, message)

                All args except `message' can be None.
        """
        name = 'APPEND'
        if not mailbox:
            mailbox = 'INBOX'
        if flags:
            if (flags[0],flags[-1]) != ('(',')'):
                flags = '(%s)' % flags
        else:
            flags = None
        if date_time:
            date_time = Time2Internaldate(date_time)
        else:
            date_time = None
        self.literal = message
        return self._simple_command(name, mailbox, flags, date_time)


    def authenticate(self, mechanism, authobject):
        """Authenticate command - requires response processing.

        'mechanism' specifies which authentication mechanism is to
        be used - it must appear in <instance>.capabilities in the
        form AUTH=<mechanism>.

        'authobject' must be a callable object:

                data = authobject(response)

        It will be called to process server continuation responses.
        It should return data that will be encoded and sent to server.
        It should return None if the client abort response '*' should
        be sent instead.
        """
        mech = mechanism.upper()
        cap = 'AUTH=%s' % mech
        if not cap in self.capabilities:
            raise self.error("Server doesn't allow %s authentication." % mech)
        self.literal = _Authenticator(authobject).process
        typ, dat = self._simple_command('AUTHENTICATE', mech)
        if typ != 'OK':
            raise self.error(dat[-1])
        self.state = 'AUTH'
        return typ, dat


    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:
            typ, dat = self._simple_command('CLOSE')
        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, dat, name)


    def fetch(self, message_set, message_parts):
        """Fetch (parts of) messages.

        (typ, [data, ...]) = <instance>.fetch(message_set, message_parts)

        'message_parts' should be a string of selected parts
        enclosed in parentheses, eg: "(UID BODY[TEXT])".

        '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, dat, name)


    def getacl(self, mailbox):