blob: e2b33ef10f499fd75ab1d709b1a3c9d7b4ca4437 [file] [log] [blame]
"""A POP3 client class.
Based on the J. Myers POP3 draft, Jan. 96
# Author: David Ascher <>
# [heavily stealing from]
# Updated: Piers Lauder <> [Jul '97]
# String method conversion and test jig improvements by ESR, February 2001.
# Added the POP3_SSL class. Methods loosely based on IMAP_SSL. Hector Urtubia <> Aug 2003
# Example (see the test function at the end of this file)
# Imports
import re, socket
__all__ = ["POP3","error_proto"]
# Exception raised when an error or invalid response is received:
class error_proto(Exception): pass
# Standard Port
POP3_PORT = 110
# Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
CR = '\r'
LF = '\n'
class POP3:
"""This class supports both the minimal and optional command sets.
Arguments can be strings or integers (where appropriate)
(e.g.: retr(1) and retr('1') both work equally well.
Minimal Command Set:
USER name user(name)
PASS string pass_(string)
STAT stat()
LIST [msg] list(msg = None)
RETR msg retr(msg)
DELE msg dele(msg)
NOOP noop()
RSET rset()
QUIT quit()
Optional Commands (some servers support these):
RPOP name rpop(name)
APOP name digest apop(name, digest)
TOP msg n top(msg, n)
UIDL [msg] uidl(msg = None)
Raises one exception: 'error_proto'.
Instantiate with:
POP3(hostname, port=110)
NB: the POP protocol locks the mailbox from user
authorization until QUIT, so be sure to get in, suck
the messages, and quit, each time you access the
POP is a line-based protocol, which means large mail
messages consume lots of python cycles reading them
If it's available on your mail server, use IMAP4
instead, it doesn't suffer from the two problems
def __init__(self, host, port=POP3_PORT,
timeout=socket._GLOBAL_DEFAULT_TIMEOUT): = host
self.port = port
self.sock = socket.create_connection((host, port), timeout)
self.file = self.sock.makefile('rb')
self._debugging = 0
self.welcome = self._getresp()
def _putline(self, line):
if self._debugging > 1: print '*put*', repr(line)
self.sock.sendall('%s%s' % (line, CRLF))
# Internal: send one command to the server (through _putline())
def _putcmd(self, line):
if self._debugging: print '*cmd*', repr(line)
# Internal: return one line from the server, stripping CRLF.
# This is where all the CPU time of this module is consumed.
# Raise error_proto('-ERR EOF') if the connection is closed.
def _getline(self):
line = self.file.readline()
if self._debugging > 1: print '*get*', repr(line)
if not line: raise error_proto('-ERR EOF')
octets = len(line)
# server can send any combination of CR & LF
# however, 'readline()' returns lines ending in LF
# so only possibilities are ...LF, ...CRLF, CR...LF
if line[-2:] == CRLF:
return line[:-2], octets
if line[0] == CR:
return line[1:-1], octets
return line[:-1], octets
# Internal: get a response from the server.
# Raise 'error_proto' if the response doesn't start with '+'.
def _getresp(self):
resp, o = self._getline()
if self._debugging > 1: print '*resp*', repr(resp)
c = resp[:1]
if c != '+':
raise error_proto(resp)
return resp
# Internal: get a response plus following text from the server.
def _getlongresp(self):
resp = self._getresp()
list = []; octets = 0
line, o = self._getline()
while line != '.':
if line[:2] == '..':
o = o-1
line = line[1:]
octets = octets + o
line, o = self._getline()
return resp, list, octets
# Internal: send a command and get the response
def _shortcmd(self, line):
return self._getresp()
# Internal: send a command and get the response plus following text
def _longcmd(self, line):
return self._getlongresp()
# These can be useful:
def getwelcome(self):
return self.welcome
def set_debuglevel(self, level):
self._debugging = level
# Here are all the POP commands:
def user(self, user):
"""Send user name, return response
(should indicate password required).
return self._shortcmd('USER %s' % user)
def pass_(self, pswd):
"""Send password, return response
(response includes message count, mailbox size).
NB: mailbox is locked by server from here to 'quit()'
return self._shortcmd('PASS %s' % pswd)
def stat(self):
"""Get mailbox status.
Result is tuple of 2 ints (message count, mailbox size)
retval = self._shortcmd('STAT')
rets = retval.split()
if self._debugging: print '*stat*', repr(rets)
numMessages = int(rets[1])
sizeMessages = int(rets[2])
return (numMessages, sizeMessages)
def list(self, which=None):
"""Request listing, return result.
Result without a message number argument is in form
['response', ['mesg_num octets', ...], octets].
Result when a message number argument is given is a
single response: the "scan listing" for that message.
if which is not None:
return self._shortcmd('LIST %s' % which)
return self._longcmd('LIST')
def retr(self, which):
"""Retrieve whole message number 'which'.
Result is in form ['response', ['line', ...], octets].
return self._longcmd('RETR %s' % which)
def dele(self, which):
"""Delete message number 'which'.
Result is 'response'.
return self._shortcmd('DELE %s' % which)
def noop(self):
"""Does nothing.
One supposes the response indicates the server is alive.
return self._shortcmd('NOOP')
def rset(self):
"""Unmark all messages marked for deletion."""
return self._shortcmd('RSET')
def quit(self):
"""Signoff: commit changes on server, unlock mailbox, close connection."""
resp = self._shortcmd('QUIT')
except error_proto, val:
resp = val
del self.file, self.sock
return resp
#__del__ = quit
# optional commands:
def rpop(self, user):
"""Not sure what this does."""
return self._shortcmd('RPOP %s' % user)
timestamp = re.compile(r'\+OK.*(<[^>]+>)')
def apop(self, user, secret):
- only possible if server has supplied a timestamp in initial greeting.
user - mailbox user;
secret - secret shared between client and server.
NB: mailbox is locked by server from here to 'quit()'
m = self.timestamp.match(self.welcome)
if not m:
raise error_proto('-ERR APOP not supported by server')
import hashlib
digest = hashlib.md5(
digest = ''.join(map(lambda x:'%02x'%ord(x), digest))
return self._shortcmd('APOP %s %s' % (user, digest))
def top(self, which, howmuch):
"""Retrieve message header of message number 'which'
and first 'howmuch' lines of message body.
Result is in form ['response', ['line', ...], octets].
return self._longcmd('TOP %s %s' % (which, howmuch))
def uidl(self, which=None):
"""Return message digest (unique id) list.
If 'which', result contains unique id for that message
in the form 'response mesgnum uid', otherwise result is
the list ['response', ['mesgnum uid', ...], octets]
if which is not None:
return self._shortcmd('UIDL %s' % which)
return self._longcmd('UIDL')
import ssl
except ImportError:
class POP3_SSL(POP3):
"""POP3 client class over SSL connection
Instantiate with: POP3_SSL(hostname, port=995, keyfile=None, certfile=None)
hostname - the hostname of the pop3 over ssl server
port - port number
keyfile - PEM formatted file that countains your private key
certfile - PEM formatted certificate chain file
See the methods of the parent class POP3 for more documentation.
def __init__(self, host, port = POP3_SSL_PORT, keyfile = None, certfile = None): = host
self.port = port
self.keyfile = keyfile
self.certfile = certfile
self.buffer = ""
msg = "getaddrinfo returns an empty list"
self.sock = None
for res in socket.getaddrinfo(, self.port, 0, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
self.sock = socket.socket(af, socktype, proto)
except socket.error, msg:
if self.sock:
self.sock = None
if not self.sock:
raise socket.error, msg
self.file = self.sock.makefile('rb')
self.sslobj = ssl.wrap_socket(self.sock, self.keyfile, self.certfile)
self._debugging = 0
self.welcome = self._getresp()
def _fillBuffer(self):
localbuf =
if len(localbuf) == 0:
raise error_proto('-ERR EOF')
self.buffer += localbuf
def _getline(self):
line = ""
renewline = re.compile(r'.*?\n')
match = renewline.match(self.buffer)
while not match:
match = renewline.match(self.buffer)
line =
self.buffer = renewline.sub('' ,self.buffer, 1)
if self._debugging > 1: print '*get*', repr(line)
octets = len(line)
if line[-2:] == CRLF:
return line[:-2], octets
if line[0] == CR:
return line[1:-1], octets
return line[:-1], octets
def _putline(self, line):
if self._debugging > 1: print '*put*', repr(line)
line += CRLF
bytes = len(line)
while bytes > 0:
sent = self.sslobj.write(line)
if sent == bytes:
break # avoid copy
line = line[sent:]
bytes = bytes - sent
def quit(self):
"""Signoff: commit changes on server, unlock mailbox, close connection."""
resp = self._shortcmd('QUIT')
except error_proto, val:
resp = val
del self.sslobj, self.sock
return resp
if __name__ == "__main__":
import sys
a = POP3(sys.argv[1])
print a.getwelcome()
(numMsgs, totalSize) = a.stat()
for i in range(1, numMsgs + 1):
(header, msg, octets) = a.retr(i)
print "Message %d:" % i
for line in msg:
print ' ' + line
print '-----------------------'