461 lines
14 KiB
Python
461 lines
14 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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# String method conversion and test jig improvements by ESR, February 2001.
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# Added the POP3_SSL class. Methods loosely based on IMAP_SSL. Hector Urtubia <urtubia@mrbook.org> Aug 2003
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# Example (see the test function at the end of this file)
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# Imports
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import errno
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import re
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import socket
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try:
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import ssl
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HAVE_SSL = True
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except ImportError:
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HAVE_SSL = False
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__all__ = ["POP3","error_proto"]
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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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# POP SSL PORT
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POP3_SSL_PORT = 995
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# Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
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CR = b'\r'
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LF = b'\n'
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CRLF = CR+LF
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# maximal line length when calling readline(). This is to prevent
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# reading arbitrary lenght lines. RFC 1939 limits POP3 line length to
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# 512 characters, including CRLF. We have selected 2048 just to be on
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# the safe side.
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_MAXLINE = 2048
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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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CAPA capa()
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STLS stls()
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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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authorization 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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encoding = 'UTF-8'
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def __init__(self, host, port=POP3_PORT,
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
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self.host = host
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self.port = port
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self._tls_established = False
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self.sock = self._create_socket(timeout)
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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 _create_socket(self, timeout):
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return socket.create_connection((self.host, self.port), timeout)
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def _putline(self, line):
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if self._debugging > 1: print('*put*', repr(line))
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self.sock.sendall(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*', repr(line))
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line = bytes(line, self.encoding)
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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(_MAXLINE + 1)
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if len(line) > _MAXLINE:
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raise error_proto('line too long')
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if self._debugging > 1: print('*get*', repr(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*', repr(resp))
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if not resp.startswith(b'+'):
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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 != b'.':
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if line.startswith(b'..'):
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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 = retval.split()
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if self._debugging: print('*stat*', repr(rets))
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numMessages = int(rets[1])
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sizeMessages = int(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', ...], 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 is not None:
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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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"""Unmark all messages marked for deletion."""
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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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resp = self._shortcmd('QUIT')
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self.close()
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return resp
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def close(self):
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"""Close the connection without assuming anything about it."""
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if self.file is not None:
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self.file.close()
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if self.sock is not None:
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try:
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self.sock.shutdown(socket.SHUT_RDWR)
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except OSError as e:
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# The server might already have closed the connection
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if e.errno != errno.ENOTCONN:
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raise
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finally:
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self.sock.close()
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self.file = self.sock = None
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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 = re.compile(br'\+OK.*(<[^>]+>)')
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def apop(self, user, password):
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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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password - mailbox password.
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NB: mailbox is locked by server from here to 'quit()'
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"""
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secret = bytes(password, self.encoding)
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m = self.timestamp.match(self.welcome)
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if not m:
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raise error_proto('-ERR APOP not supported by server')
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import hashlib
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digest = m.group(1)+secret
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digest = hashlib.md5(digest).hexdigest()
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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 is not None:
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return self._shortcmd('UIDL %s' % which)
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return self._longcmd('UIDL')
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def capa(self):
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"""Return server capabilities (RFC 2449) as a dictionary
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>>> c=poplib.POP3('localhost')
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>>> c.capa()
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{'IMPLEMENTATION': ['Cyrus', 'POP3', 'server', 'v2.2.12'],
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'TOP': [], 'LOGIN-DELAY': ['0'], 'AUTH-RESP-CODE': [],
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'EXPIRE': ['NEVER'], 'USER': [], 'STLS': [], 'PIPELINING': [],
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'UIDL': [], 'RESP-CODES': []}
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>>>
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Really, according to RFC 2449, the cyrus folks should avoid
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having the implementation split into multiple arguments...
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"""
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def _parsecap(line):
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lst = line.decode('ascii').split()
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return lst[0], lst[1:]
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caps = {}
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try:
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resp = self._longcmd('CAPA')
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rawcaps = resp[1]
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for capline in rawcaps:
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capnm, capargs = _parsecap(capline)
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caps[capnm] = capargs
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except error_proto as _err:
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raise error_proto('-ERR CAPA not supported by server')
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return caps
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def stls(self, context=None):
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"""Start a TLS session on the active connection as specified in RFC 2595.
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context - a ssl.SSLContext
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"""
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if not HAVE_SSL:
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raise error_proto('-ERR TLS support missing')
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if self._tls_established:
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raise error_proto('-ERR TLS session already established')
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caps = self.capa()
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if not 'STLS' in caps:
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raise error_proto('-ERR STLS not supported by server')
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if context is None:
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context = ssl._create_stdlib_context()
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resp = self._shortcmd('STLS')
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server_hostname = self.host if ssl.HAS_SNI else None
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self.sock = context.wrap_socket(self.sock,
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server_hostname=server_hostname)
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self.file = self.sock.makefile('rb')
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self._tls_established = True
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return resp
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if HAVE_SSL:
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class POP3_SSL(POP3):
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"""POP3 client class over SSL connection
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Instantiate with: POP3_SSL(hostname, port=995, keyfile=None, certfile=None,
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context=None)
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hostname - the hostname of the pop3 over ssl server
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port - port number
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keyfile - PEM formatted file that contains your private key
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certfile - PEM formatted certificate chain file
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context - a ssl.SSLContext
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See the methods of the parent class POP3 for more documentation.
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"""
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def __init__(self, host, port=POP3_SSL_PORT, keyfile=None, certfile=None,
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT, context=None):
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if context is not None and keyfile is not None:
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raise ValueError("context and keyfile arguments are mutually "
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"exclusive")
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if context is not None and certfile is not None:
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raise ValueError("context and certfile arguments are mutually "
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"exclusive")
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self.keyfile = keyfile
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self.certfile = certfile
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if context is None:
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context = ssl._create_stdlib_context(certfile=certfile,
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keyfile=keyfile)
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self.context = context
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POP3.__init__(self, host, port, timeout)
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def _create_socket(self, timeout):
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sock = POP3._create_socket(self, timeout)
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server_hostname = self.host if ssl.HAS_SNI else None
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sock = self.context.wrap_socket(sock,
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server_hostname=server_hostname)
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return sock
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def stls(self, keyfile=None, certfile=None, context=None):
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"""The method unconditionally raises an exception since the
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STLS command doesn't make any sense on an already established
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SSL/TLS session.
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"""
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raise error_proto('-ERR TLS session already established')
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__all__.append("POP3_SSL")
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if __name__ == "__main__":
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import sys
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a = POP3(sys.argv[1])
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print(a.getwelcome())
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a.user(sys.argv[2])
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a.pass_(sys.argv[3])
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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 %d:" % 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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