-"""A POP3 client class. Based on the J. Myers POP3 draft, Jan. 96
+"""A POP3 client class.
-Author: David Ascher <david_ascher@brown.edu> [heavily stealing from
-nntplib.py]
+Based on the J. Myers POP3 draft, Jan. 96
+Author: David Ascher <david_ascher@brown.edu>
+ [heavily stealing from nntplib.py]
+Updated: Piers Lauder <piers@cs.su.oz.au> [Jul '97]
"""
-__version__ = "0.01a - Feb 1, 1996 (with formatting changes by GvR)"
-
# Example (see the test function at the end of this file)
TESTSERVER = "localhost"
# Imports
-from types import StringType
-import regex
-import socket
-import string
+import regex, socket, string
# Exception raised when an error or invalid response is received:
-error_proto = 'pop3.error_proto' # response does not begin with +
+
+class error_proto(Exception): pass
# Standard Port
POP3_PORT = 110
-# Line terminators (we always output CRLF, but accept any of CRLF, CR, LF)
-CRLF = '\r\n'
-
-# This library 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)
-# APOP name digest apop(name, digest)
-# TOP msg n top(msg, n)
-# UIDL [msg] uidl(msg = None)
-#
+# Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
+CR = '\r'
+LF = '\n'
+CRLF = CR+LF
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
+ authorisation until QUIT, so be sure to get in, suck
+ the messages, and quit, each time you access the
+ mailbox.
+
+ POP is a line-based protocol, which means large mail
+ messages consume lots of python cycles reading them
+ line-by-line.
+
+ If it's available on your mail server, use IMAP4
+ instead, it doesn't suffer from the two problems
+ above.
+ """
+
+
def __init__(self, host, port = POP3_PORT):
self.host = host
self.port = port
self._debugging = 0
self.welcome = self._getresp()
+
def _putline(self, line):
- line = line + CRLF
- if self._debugging > 1: print '*put*', `line`
- self.sock.send(line)
+ #if self._debugging > 1: print '*put*', `line`
+ self.sock.send('%s%s' % (line, CRLF))
+
# Internal: send one command to the server (through _putline())
+
def _putcmd(self, line):
- if self._debugging: print '*cmd*', `line`
+ #if self._debugging: print '*cmd*', `line`
self._putline(line)
+
# Internal: return one line from the server, stripping CRLF.
- # Raise EOFError if the connection is closed
+ # 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*', `line`
- if not line: raise EOFError
- if line[-2:] == CRLF: line = line[:-2]
- elif line[-1:] in CRLF: line = line[:-1]
- return line
+ #if self._debugging > 1: print '*get*', `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 various errors if the response indicates an error
+ # Raise 'error_proto' if the response doesn't start with '+'.
+
def _getresp(self):
- resp = self._getline()
- if self._debugging > 1: print '*resp*', `resp`
+ resp, o = self._getline()
+ #if self._debugging > 1: print '*resp*', `resp`
c = resp[:1]
if c != '+':
- raise error_proto, resp
+ raise error_proto(resp)
return resp
+
# Internal: get a response plus following text from the server.
- # Raise various errors if the response indicates an error
+
def _getlongresp(self):
resp = self._getresp()
- list = []
- while 1:
- line = self._getline()
- if line == '.':
- break
+ list = []; octets = 0
+ line, o = self._getline()
+ while line != '.':
+ octets = octets + o
list.append(line)
- return resp, list
+ line, o = self._getline()
+ return resp, list, octets
+
# Internal: send a command and get the response
+
def _shortcmd(self, line):
self._putcmd(line)
return self._getresp()
+
# Internal: send a command and get the response plus following text
+
def _longcmd(self, line):
self._putcmd(line)
return self._getlongresp()
+
# These can be useful:
- def getwelcome(self):
+ def getwelcome(self):
return self.welcome
+
def set_debuglevel(self, level):
self._debugging = level
+
# Here are all the POP commands:
def user(self, user):
- user = str(user)
- return self._shortcmd('USER ' + user)
+ """Send user name, return response
+
+ (should indicate password required).
+ """
+ return self._shortcmd('USER %s' % user)
+
def pass_(self, pswd):
- pswd = str(pswd)
- return self._shortcmd('PASS ' + 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 = string.split(retval)
+ #if self._debugging: print '*stat*', `rets`
numMessages = string.atoi(rets[1])
sizeMessages = string.atoi(rets[2])
return (numMessages, sizeMessages)
- def list(self, msg=None):
- if msg:
- msg = str(msg)
- return self._longcmd('LIST ' + msg)
- else:
- return self._longcmd('LIST')
+
+ def list(self, which=None):
+ """Request listing, return result.
+ Result is in form ['response', ['mesg_num octets', ...]].
+
+ Unsure what the optional 'msg' arg does.
+ """
+ if which:
+ return self._longcmd('LIST %s' % which)
+ return self._longcmd('LIST')
+
def retr(self, which):
- which = str(which)
- return self._longcmd('RETR ' + which)
+ """Retrieve whole message number 'which'.
+
+ Result is in form ['response', ['line', ...], octets].
+ """
+ return self._longcmd('RETR %s' % which)
+
def dele(self, which):
- which = str(which)
- return self._shortcmd('DELE ' + 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):
+ """Not sure what this does."""
return self._shortcmd('RSET')
- # optional commands:
-
- def apop(self, digest):
- digest = str(digest)
- return self._shortcmd('APOP ' + digest)
-
- def top(self, which, howmuch):
- which = str(which)
- howmuch = str(howmuch)
- return self._longcmd('TOP ' + which + ' ' + howmuch)
-
- def uidl(self, which = None):
- if which:
- which = str(which)
- return self._longcmd('UIDL ' + which)
- else:
- return self._longcmd('UIDL')
def quit(self):
- resp = self._shortcmd('QUIT')
+ """Signoff: commit changes on server, unlock mailbox, close connection."""
+ try:
+ resp = self._shortcmd('QUIT')
+ except error_proto(val):
+ resp = val
self.file.close()
self.sock.close()
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 = regex.compile('\+OK.*\(<[^>]+>\)')
+
+ def apop(self, user, secret):
+ """Authorisation
+
+ - only possible if server has supplied a timestamp in initial greeting.
+
+ Args:
+ user - mailbox user;
+ secret - secret shared between client and server.
+
+ NB: mailbox is locked by server from here to 'quit()'
+ """
+ if self.timestamp.match(self.welcome) <= 0:
+ raise error_proto('-ERR APOP not supported by server')
+ import md5
+ digest = md5.new(self.timestamp.group(1)+secret).digest()
+ digest = string.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,
+ otherwise result is list ['response', ['mesgnum uid', ...], octets]
+ """
+ if which:
+ return self._shortcmd('UIDL %s' % which)
+ return self._longcmd('UIDL')
+
+
if __name__ == "__main__":
a = POP3(TESTSERVER)
print a.getwelcome()
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