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322 lines
7.4 KiB
Python
322 lines
7.4 KiB
Python
"""A POP3 client class.
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Based on the J. Myers POP3 draft, Jan. 96
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"""
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# Author: David Ascher <david_ascher@brown.edu>
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# [heavily stealing from nntplib.py]
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# Updated: Piers Lauder <piers@cs.su.oz.au> [Jul '97]
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# Example (see the test function at the end of this file)
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TESTSERVER = "localhost"
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TESTACCOUNT = "test"
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TESTPASSWORD = "_passwd_"
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# Imports
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import regex, socket, string
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# Exception raised when an error or invalid response is received:
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class error_proto(Exception): pass
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# Standard Port
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POP3_PORT = 110
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# Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
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CR = '\r'
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LF = '\n'
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CRLF = CR+LF
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class POP3:
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"""This class supports both the minimal and optional command sets.
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Arguments can be strings or integers (where appropriate)
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(e.g.: retr(1) and retr('1') both work equally well.
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Minimal Command Set:
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USER name user(name)
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PASS string pass_(string)
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STAT stat()
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LIST [msg] list(msg = None)
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RETR msg retr(msg)
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DELE msg dele(msg)
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NOOP noop()
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RSET rset()
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QUIT quit()
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Optional Commands (some servers support these):
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RPOP name rpop(name)
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APOP name digest apop(name, digest)
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TOP msg n top(msg, n)
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UIDL [msg] uidl(msg = None)
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Raises one exception: 'error_proto'.
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Instantiate with:
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POP3(hostname, port=110)
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NB: the POP protocol locks the mailbox from user
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authorisation until QUIT, so be sure to get in, suck
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the messages, and quit, each time you access the
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mailbox.
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POP is a line-based protocol, which means large mail
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messages consume lots of python cycles reading them
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line-by-line.
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If it's available on your mail server, use IMAP4
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instead, it doesn't suffer from the two problems
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above.
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"""
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def __init__(self, host, port = POP3_PORT):
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self.host = host
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self.port = port
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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('rb')
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self._debugging = 0
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self.welcome = self._getresp()
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def _putline(self, line):
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#if self._debugging > 1: print '*put*', `line`
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self.sock.send('%s%s' % (line, CRLF))
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# Internal: send one command to the server (through _putline())
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def _putcmd(self, line):
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#if self._debugging: print '*cmd*', `line`
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self._putline(line)
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# Internal: return one line from the server, stripping CRLF.
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# This is where all the CPU time of this module is consumed.
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# Raise error_proto('-ERR EOF') if the connection is closed.
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def _getline(self):
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line = self.file.readline()
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#if self._debugging > 1: print '*get*', `line`
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if not line: raise error_proto('-ERR EOF')
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octets = len(line)
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# server can send any combination of CR & LF
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# however, 'readline()' returns lines ending in LF
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# so only possibilities are ...LF, ...CRLF, CR...LF
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if line[-2:] == CRLF:
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return line[:-2], octets
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if line[0] == CR:
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return line[1:-1], octets
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return line[:-1], octets
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# Internal: get a response from the server.
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# Raise 'error_proto' if the response doesn't start with '+'.
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def _getresp(self):
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resp, o = self._getline()
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#if self._debugging > 1: print '*resp*', `resp`
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c = resp[:1]
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if c != '+':
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raise error_proto(resp)
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return resp
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# Internal: get a response plus following text from the server.
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def _getlongresp(self):
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resp = self._getresp()
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list = []; octets = 0
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line, o = self._getline()
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while line != '.':
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if line[:2] == '..':
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o = o-1
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line = line[1:]
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octets = octets + o
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list.append(line)
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line, o = self._getline()
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return resp, list, octets
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# Internal: send a command and get the response
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def _shortcmd(self, line):
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self._putcmd(line)
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return self._getresp()
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# Internal: send a command and get the response plus following text
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def _longcmd(self, line):
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self._putcmd(line)
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return self._getlongresp()
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# These can be useful:
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def getwelcome(self):
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return self.welcome
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def set_debuglevel(self, level):
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self._debugging = level
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# Here are all the POP commands:
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def user(self, user):
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"""Send user name, return response
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(should indicate password required).
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"""
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return self._shortcmd('USER %s' % user)
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def pass_(self, pswd):
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"""Send password, return response
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(response includes message count, mailbox size).
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NB: mailbox is locked by server from here to 'quit()'
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"""
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return self._shortcmd('PASS %s' % pswd)
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def stat(self):
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"""Get mailbox status.
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Result is tuple of 2 ints (message count, mailbox size)
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"""
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retval = self._shortcmd('STAT')
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rets = string.split(retval)
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#if self._debugging: print '*stat*', `rets`
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numMessages = string.atoi(rets[1])
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sizeMessages = string.atoi(rets[2])
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return (numMessages, sizeMessages)
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def list(self, which=None):
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"""Request listing, return result.
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Result without a message number argument is in form
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['response', ['mesg_num octets', ...]].
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Result when a message number argument is given is a
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single response: the "scan listing" for that message.
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"""
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if which:
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return self._shortcmd('LIST %s' % which)
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return self._longcmd('LIST')
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def retr(self, which):
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"""Retrieve whole message number 'which'.
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Result is in form ['response', ['line', ...], octets].
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"""
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return self._longcmd('RETR %s' % which)
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def dele(self, which):
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"""Delete message number 'which'.
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Result is 'response'.
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"""
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return self._shortcmd('DELE %s' % which)
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def noop(self):
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"""Does nothing.
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One supposes the response indicates the server is alive.
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"""
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return self._shortcmd('NOOP')
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def rset(self):
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"""Not sure what this does."""
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return self._shortcmd('RSET')
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def quit(self):
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"""Signoff: commit changes on server, unlock mailbox, close connection."""
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try:
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resp = self._shortcmd('QUIT')
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except error_proto, val:
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resp = val
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self.file.close()
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self.sock.close()
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del self.file, self.sock
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return resp
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#__del__ = quit
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# optional commands:
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def rpop(self, user):
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"""Not sure what this does."""
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return self._shortcmd('RPOP %s' % user)
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timestamp = regex.compile('\+OK.*\(<[^>]+>\)')
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def apop(self, user, secret):
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"""Authorisation
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- only possible if server has supplied a timestamp in initial greeting.
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Args:
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user - mailbox user;
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secret - secret shared between client and server.
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NB: mailbox is locked by server from here to 'quit()'
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"""
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if self.timestamp.match(self.welcome) <= 0:
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raise error_proto('-ERR APOP not supported by server')
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import md5
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digest = md5.new(self.timestamp.group(1)+secret).digest()
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digest = string.join(map(lambda x:'%02x'%ord(x), digest), '')
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return self._shortcmd('APOP %s %s' % (user, digest))
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def top(self, which, howmuch):
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"""Retrieve message header of message number 'which'
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and first 'howmuch' lines of message body.
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Result is in form ['response', ['line', ...], octets].
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"""
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return self._longcmd('TOP %s %s' % (which, howmuch))
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def uidl(self, which=None):
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"""Return message digest (unique id) list.
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If 'which', result contains unique id for that message
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in the form 'response mesgnum uid', otherwise result is
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the list ['response', ['mesgnum uid', ...], octets]
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"""
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if which:
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return self._shortcmd('UIDL %s' % which)
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return self._longcmd('UIDL')
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if __name__ == "__main__":
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a = POP3(TESTSERVER)
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print a.getwelcome()
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a.user(TESTACCOUNT)
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a.pass_(TESTPASSWORD)
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a.list()
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(numMsgs, totalSize) = a.stat()
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for i in range(1, numMsgs + 1):
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(header, msg, octets) = a.retr(i)
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print "Message ", `i`, ':'
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for line in msg:
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print ' ' + line
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print '-----------------------'
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a.quit()
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