808 lines
20 KiB
Python
808 lines
20 KiB
Python
"""IMAP4 client.
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Based on RFC 2060.
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Author: Piers Lauder <piers@cs.su.oz.au> December 1997.
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Public class: IMAP4
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Public variable: Debug
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Public functions: Internaldate2tuple
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Int2AP
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ParseFlags
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Time2Internaldate
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"""
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import re, socket, string, time, whrandom
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# Globals
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CRLF = '\r\n'
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Debug = 0
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IMAP4_PORT = 143
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AllowedVersions = ('IMAP4REV1', 'IMAP4') # Most recent first
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# Commands
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Commands = {
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# name valid states
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'APPEND': ('AUTH', 'SELECTED'),
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'AUTHENTICATE': ('NONAUTH',),
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'CAPABILITY': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
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'CHECK': ('SELECTED',),
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'CLOSE': ('SELECTED',),
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'COPY': ('SELECTED',),
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'CREATE': ('AUTH', 'SELECTED'),
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'DELETE': ('AUTH', 'SELECTED'),
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'EXAMINE': ('AUTH', 'SELECTED'),
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'EXPUNGE': ('SELECTED',),
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'FETCH': ('SELECTED',),
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'LIST': ('AUTH', 'SELECTED'),
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'LOGIN': ('NONAUTH',),
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'LOGOUT': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
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'LSUB': ('AUTH', 'SELECTED'),
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'NOOP': ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
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'RENAME': ('AUTH', 'SELECTED'),
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'SEARCH': ('SELECTED',),
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'SELECT': ('AUTH', 'SELECTED'),
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'STATUS': ('AUTH', 'SELECTED'),
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'STORE': ('SELECTED',),
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'SUBSCRIBE': ('AUTH', 'SELECTED'),
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'UID': ('SELECTED',),
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'UNSUBSCRIBE': ('AUTH', 'SELECTED'),
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}
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# Patterns to match server responses
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Continuation = re.compile(r'\+ (?P<data>.*)')
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Flags = re.compile(r'.*FLAGS \((?P<flags>[^\)]*)\)')
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InternalDate = re.compile(r'.*INTERNALDATE "'
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r'(?P<day>[ 123][0-9])-(?P<mon>[A-Z][a-z][a-z])-(?P<year>[0-9][0-9][0-9][0-9])'
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r' (?P<hour>[0-9][0-9]):(?P<min>[0-9][0-9]):(?P<sec>[0-9][0-9])'
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r' (?P<zonen>[-+])(?P<zoneh>[0-9][0-9])(?P<zonem>[0-9][0-9])'
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r'"')
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Literal = re.compile(r'(?P<data>.*) {(?P<size>\d+)}$')
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Response_code = re.compile(r'\[(?P<type>[A-Z-]+)( (?P<data>[^\]]*))?\]')
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Untagged_response = re.compile(r'\* (?P<type>[A-Z-]+) (?P<data>.*)')
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Untagged_status = re.compile(r'\* (?P<data>\d+) (?P<type>[A-Z-]+)( (?P<data2>.*))?')
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class IMAP4:
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"""IMAP4 client class.
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Instantiate with: IMAP4([host[, port]])
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host - host's name (default: localhost);
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port - port number (default: standard IMAP4 port).
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All IMAP4rev1 commands are supported by methods of the same
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name (in lower-case). Each command returns a tuple: (type, [data, ...])
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where 'type' is usually 'OK' or 'NO', and 'data' is either the
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text from the tagged response, or untagged results from command.
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Errors raise the exception class <instance>.error("<reason>").
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IMAP4 server errors raise <instance>.abort("<reason>"),
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which is a sub-class of 'error'.
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"""
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class error(Exception): pass # Logical errors - debug required
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class abort(error): pass # Service errors - close and retry
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def __init__(self, host = '', port = IMAP4_PORT):
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self.host = host
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self.port = port
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self.debug = Debug
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self.state = 'LOGOUT'
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self.tagged_commands = {} # Tagged commands awaiting response
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self.untagged_responses = {} # {typ: [data, ...], ...}
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self.continuation_response = '' # Last continuation response
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self.tagnum = 0
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# Open socket to server.
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.connect(self.host, self.port)
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self.file = self.sock.makefile('r')
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# Create unique tag for this session,
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# and compile tagged response matcher.
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self.tagpre = Int2AP(whrandom.random()*32000)
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self.tagre = re.compile(r'(?P<tag>'
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+ self.tagpre
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+ r'\d+) (?P<type>[A-Z]+) (?P<data>.*)')
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# Get server welcome message,
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# request and store CAPABILITY response.
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if __debug__ and self.debug >= 1:
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print '\tnew IMAP4 connection, tag=%s' % self.tagpre
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self.welcome = self._get_response()
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if self.untagged_responses.has_key('PREAUTH'):
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self.state = 'AUTH'
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elif self.untagged_responses.has_key('OK'):
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self.state = 'NONAUTH'
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# elif self.untagged_responses.has_key('BYE'):
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else:
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raise self.error(self.welcome)
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cap = 'CAPABILITY'
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self._simple_command(cap)
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if not self.untagged_responses.has_key(cap):
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raise self.error('no CAPABILITY response from server')
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self.capabilities = tuple(string.split(self.untagged_responses[cap][-1]))
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if __debug__ and self.debug >= 3:
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print '\tCAPABILITIES: %s' % `self.capabilities`
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self.PROTOCOL_VERSION = None
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for version in AllowedVersions:
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if not version in self.capabilities:
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continue
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self.PROTOCOL_VERSION = version
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break
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if not self.PROTOCOL_VERSION:
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raise self.error('server not IMAP4 compliant')
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def __getattr__(self, attr):
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"""Allow UPPERCASE variants of all following IMAP4 commands."""
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if Commands.has_key(attr):
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return eval("self.%s" % string.lower(attr))
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raise AttributeError("Unknown IMAP4 command: '%s'" % attr)
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# Public methods
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def append(self, mailbox, flags, date_time, message):
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"""Append message to named mailbox.
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(typ, [data]) = <instance>.append(mailbox, flags, date_time, message)
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"""
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name = 'APPEND'
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if flags:
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flags = '(%s)' % flags
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else:
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flags = None
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if date_time:
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date_time = Time2Internaldate(date_time)
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else:
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date_time = None
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tag = self._command(name, mailbox, flags, date_time, message)
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return self._command_complete(name, tag)
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def authenticate(self, func):
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"""Authenticate command - requires response processing.
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UNIMPLEMENTED
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"""
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raise self.error('UNIMPLEMENTED')
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def check(self):
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"""Checkpoint mailbox on server.
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(typ, [data]) = <instance>.check()
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"""
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return self._simple_command('CHECK')
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def close(self):
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"""Close currently selected mailbox.
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Deleted messages are removed from writable mailbox.
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This is the recommended command before 'LOGOUT'.
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(typ, [data]) = <instance>.close()
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"""
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try:
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try: typ, dat = self._simple_command('CLOSE')
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except EOFError: typ, dat = None, [None]
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finally:
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self.state = 'AUTH'
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return typ, dat
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def copy(self, message_set, new_mailbox):
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"""Copy 'message_set' messages onto end of 'new_mailbox'.
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(typ, [data]) = <instance>.copy(message_set, new_mailbox)
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"""
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return self._simple_command('COPY', message_set, new_mailbox)
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def create(self, mailbox):
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"""Create new mailbox.
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(typ, [data]) = <instance>.create(mailbox)
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"""
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return self._simple_command('CREATE', mailbox)
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def delete(self, mailbox):
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"""Delete old mailbox.
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(typ, [data]) = <instance>.delete(mailbox)
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"""
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return self._simple_command('DELETE', mailbox)
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def expunge(self):
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"""Permanently remove deleted items from selected mailbox.
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Generates 'EXPUNGE' response for each deleted message.
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(typ, [data]) = <instance>.expunge()
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'data' is list of 'EXPUNGE'd message numbers in order received.
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"""
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name = 'EXPUNGE'
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typ, dat = self._simple_command(name)
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return self._untagged_response(typ, name)
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def fetch(self, message_set, message_parts):
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"""Fetch (parts of) messages.
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(typ, [data, ...]) = <instance>.fetch(message_set, message_parts)
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'data' are tuples of message part envelope and data.
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"""
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name = 'FETCH'
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typ, dat = self._simple_command(name, message_set, message_parts)
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return self._untagged_response(typ, name)
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def list(self, directory='""', pattern='*'):
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"""List mailbox names in directory matching pattern.
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(typ, [data]) = <instance>.list(directory='""', pattern='*')
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'data' is list of LIST responses.
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"""
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name = 'LIST'
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typ, dat = self._simple_command(name, directory, pattern)
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return self._untagged_response(typ, name)
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def login(self, user, password):
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"""Identify client using plaintext password.
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(typ, [data]) = <instance>.list(user, password)
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"""
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if not 'AUTH=LOGIN' in self.capabilities \
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and not 'AUTH-LOGIN' in self.capabilities:
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raise self.error("server doesn't allow LOGIN authorisation")
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typ, dat = self._simple_command('LOGIN', user, password)
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if typ != 'OK':
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raise self.error(dat)
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self.state = 'AUTH'
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return typ, dat
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def logout(self):
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"""Shutdown connection to server.
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(typ, [data]) = <instance>.logout()
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Returns server 'BYE' response.
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"""
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self.state = 'LOGOUT'
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try: typ, dat = self._simple_command('LOGOUT')
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except EOFError: typ, dat = None, [None]
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self.file.close()
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self.sock.close()
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if self.untagged_responses.has_key('BYE'):
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return 'BYE', self.untagged_responses['BYE']
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return typ, dat
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def lsub(self, directory='""', pattern='*'):
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"""List 'subscribed' mailbox names in directory matching pattern.
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(typ, [data, ...]) = <instance>.lsub(directory='""', pattern='*')
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'data' are tuples of message part envelope and data.
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"""
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name = 'LSUB'
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typ, dat = self._simple_command(name, directory, pattern)
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return self._untagged_response(typ, name)
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def recent(self):
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"""Prompt server for an update.
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(typ, [data]) = <instance>.recent()
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'data' is None if no new messages,
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else value of RECENT response.
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"""
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name = 'RECENT'
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typ, dat = self._untagged_response('OK', name)
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if dat[-1]:
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return typ, dat
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typ, dat = self._simple_command('NOOP')
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return self._untagged_response(typ, name)
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def rename(self, oldmailbox, newmailbox):
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"""Rename old mailbox name to new.
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(typ, data) = <instance>.rename(oldmailbox, newmailbox)
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"""
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return self._simple_command('RENAME', oldmailbox, newmailbox)
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def response(self, code):
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"""Return data for response 'code' if received, or None.
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(code, [data]) = <instance>.response(code)
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"""
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return code, self.untagged_responses.get(code, [None])
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def search(self, charset, criteria):
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"""Search mailbox for matching messages.
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(typ, [data]) = <instance>.search(charset, criteria)
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'data' is space separated list of matching message numbers.
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"""
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name = 'SEARCH'
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if charset:
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charset = 'CHARSET ' + charset
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typ, dat = self._simple_command(name, charset, criteria)
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return self._untagged_response(typ, name)
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def select(self, mailbox='INBOX', readonly=None):
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"""Select a mailbox.
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(typ, [data]) = <instance>.select(mailbox='INBOX', readonly=None)
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'data' is count of messages in mailbox ('EXISTS' response).
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"""
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# Mandated responses are ('FLAGS', 'EXISTS', 'RECENT', 'UIDVALIDITY')
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# Remove immediately interesting responses
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for r in ('EXISTS', 'READ-WRITE'):
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if self.untagged_responses.has_key(r):
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del self.untagged_responses[r]
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if readonly:
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name = 'EXAMINE'
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else:
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name = 'SELECT'
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typ, dat = self._simple_command(name, mailbox)
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if typ == 'OK':
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self.state = 'SELECTED'
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elif typ == 'NO':
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self.state = 'AUTH'
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if not readonly and not self.untagged_responses.has_key('READ-WRITE'):
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raise self.error('%s is not writable' % mailbox)
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return typ, self.untagged_responses.get('EXISTS', [None])
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def status(self, mailbox, names):
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"""Request named status conditions for mailbox.
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(typ, [data]) = <instance>.status(mailbox, names)
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"""
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name = 'STATUS'
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if self.PROTOCOL_VERSION == 'IMAP4':
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raise self.error('%s unimplemented in IMAP4 (obtain IMAP4rev1 server, or re-code)' % name)
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typ, dat = self._simple_command(name, mailbox, names)
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return self._untagged_response(typ, name)
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def store(self, message_set, command, flag_list):
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"""Alters flag dispositions for messages in mailbox.
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(typ, [data]) = <instance>.store(message_set, command, flag_list)
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"""
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command = '%s %s' % (command, flag_list)
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typ, dat = self._simple_command('STORE', message_set, command)
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return self._untagged_response(typ, 'FETCH')
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def subscribe(self, mailbox):
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"""Subscribe to new mailbox.
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(typ, [data]) = <instance>.subscribe(mailbox)
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"""
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return self._simple_command('SUBSCRIBE', mailbox)
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def uid(self, command, args):
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"""Execute "command args" with messages identified by UID,
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rather than message number.
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(typ, [data]) = <instance>.uid(command, args)
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Returns response appropriate to 'command'.
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"""
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name = 'UID'
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typ, dat = self._simple_command('UID', command, args)
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if command == 'SEARCH':
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name = 'SEARCH'
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else:
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name = 'FETCH'
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typ, dat2 = self._untagged_response(typ, name)
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if dat2[-1]: dat = dat2
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return typ, dat
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def unsubscribe(self, mailbox):
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"""Unsubscribe from old mailbox.
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(typ, [data]) = <instance>.unsubscribe(mailbox)
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"""
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return self._simple_command('UNSUBSCRIBE', mailbox)
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def xatom(self, name, arg1=None, arg2=None):
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"""Allow simple extension commands
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notified by server in CAPABILITY response.
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(typ, [data]) = <instance>.xatom(name, arg1=None, arg2=None)
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"""
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if name[0] != 'X' or not name in self.capabilities:
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raise self.error('unknown extension command: %s' % name)
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return self._simple_command(name, arg1, arg2)
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# Private methods
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def _append_untagged(self, typ, dat):
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if self.untagged_responses.has_key(typ):
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self.untagged_responses[typ].append(dat)
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else:
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self.untagged_responses[typ] = [dat]
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if __debug__ and self.debug >= 5:
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print '\tuntagged_responses[%s] += %.20s..' % (typ, `dat`)
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def _command(self, name, dat1=None, dat2=None, dat3=None, literal=None):
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if self.state not in Commands[name]:
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raise self.error(
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'command %s illegal in state %s' % (name, self.state))
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tag = self._new_tag()
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data = '%s %s' % (tag, name)
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for d in (dat1, dat2, dat3):
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if d is not None: data = '%s %s' % (data, d)
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if literal is not None:
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data = '%s {%s}' % (data, len(literal))
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try:
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self.sock.send('%s%s' % (data, CRLF))
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except socket.error, val:
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raise self.abort('socket error: %s' % val)
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if __debug__ and self.debug >= 4:
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print '\t> %s' % data
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if literal is None:
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return tag
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# Wait for continuation response
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while self._get_response():
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if self.tagged_commands[tag]: # BAD/NO?
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return tag
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# Send literal
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if __debug__ and self.debug >= 4:
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print '\twrite literal size %s' % len(literal)
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try:
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self.sock.send(literal)
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self.sock.send(CRLF)
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except socket.error, val:
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raise self.abort('socket error: %s' % val)
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return tag
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def _command_complete(self, name, tag):
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try:
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typ, data = self._get_tagged_response(tag)
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except self.abort, val:
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raise self.abort('command: %s => %s' % (name, val))
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except self.error, val:
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raise self.error('command: %s => %s' % (name, val))
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if self.untagged_responses.has_key('BYE') and name != 'LOGOUT':
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raise self.abort(self.untagged_responses['BYE'][-1])
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if typ == 'BAD':
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raise self.error('%s command error: %s %s' % (name, typ, data))
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return typ, data
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def _get_response(self):
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# Read response and store.
|
|
#
|
|
# Returns None for continuation responses,
|
|
# otherwise first response line received
|
|
|
|
# Protocol mandates all lines terminated by CRLF.
|
|
|
|
resp = self._get_line()[:-2]
|
|
|
|
# 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()[:-2]
|
|
|
|
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
|
|
|
|
if __debug__ and self.debug >= 4:
|
|
print '\t< %s' % line[:-2]
|
|
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, dat1=None, dat2=None):
|
|
|
|
return self._command_complete(name, self._command(name, dat1, dat2))
|
|
|
|
|
|
def _untagged_response(self, typ, name):
|
|
|
|
if not self.untagged_responses.has_key(name):
|
|
return typ, [None]
|
|
data = self.untagged_responses[name]
|
|
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',)),
|
|
('rename', ('/tmp/xxx', '/tmp/yyy')),
|
|
('CREATE', ('/tmp/yyz',)),
|
|
('append', ('/tmp/yyz', None, None, 'From: anon@x.y.z\n\ndata...')),
|
|
('select', ('/tmp/yyz',)),
|
|
('recent', ()),
|
|
('uid', ('SEARCH', 'ALL')),
|
|
('fetch', ('1', '(INTERNALDATE RFC822)')),
|
|
('store', ('1', 'FLAGS', '(\Deleted)')),
|
|
('expunge', ()),
|
|
('close', ()),
|
|
)
|
|
|
|
test_seq2 = (
|
|
('select', ()),
|
|
('response',('UIDVALIDITY',)),
|
|
('uid', ('SEARCH', 'ALL')),
|
|
('recent', ()),
|
|
('response', ('EXISTS',)),
|
|
('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%')):
|
|
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 (FLAGS INTERNALDATE RFC822.SIZE RFC822.HEADER RFC822)' % uid))
|