| 1 | """A POP3 client class.
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| 2 |
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| 3 | Based on the J. Myers POP3 draft, Jan. 96
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| 4 | """
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| 5 |
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| 6 | # Author: David Ascher <david_ascher@brown.edu>
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| 7 | # [heavily stealing from nntplib.py]
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| 8 | # Updated: Piers Lauder <piers@cs.su.oz.au> [Jul '97]
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| 9 | # String method conversion and test jig improvements by ESR, February 2001.
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| 10 | # Added the POP3_SSL class. Methods loosely based on IMAP_SSL. Hector Urtubia <urtubia@mrbook.org> Aug 2003
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| 11 |
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| 12 | # Example (see the test function at the end of this file)
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| 13 |
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| 14 | # Imports
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| 15 |
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| 16 | import re, socket
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| 17 |
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| 18 | __all__ = ["POP3","error_proto","POP3_SSL"]
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| 19 |
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| 20 | # Exception raised when an error or invalid response is received:
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| 21 |
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| 22 | class error_proto(Exception): pass
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| 23 |
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| 24 | # Standard Port
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| 25 | POP3_PORT = 110
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| 26 |
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| 27 | # POP SSL PORT
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| 28 | POP3_SSL_PORT = 995
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| 29 |
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| 30 | # Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
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| 31 | CR = '\r'
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| 32 | LF = '\n'
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| 33 | CRLF = CR+LF
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| 34 |
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| 35 |
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| 36 | class POP3:
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| 37 |
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| 38 | """This class supports both the minimal and optional command sets.
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| 39 | Arguments can be strings or integers (where appropriate)
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| 40 | (e.g.: retr(1) and retr('1') both work equally well.
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| 41 |
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| 42 | Minimal Command Set:
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| 43 | USER name user(name)
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| 44 | PASS string pass_(string)
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| 45 | STAT stat()
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| 46 | LIST [msg] list(msg = None)
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| 47 | RETR msg retr(msg)
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| 48 | DELE msg dele(msg)
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| 49 | NOOP noop()
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| 50 | RSET rset()
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| 51 | QUIT quit()
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| 52 |
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| 53 | Optional Commands (some servers support these):
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| 54 | RPOP name rpop(name)
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| 55 | APOP name digest apop(name, digest)
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| 56 | TOP msg n top(msg, n)
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| 57 | UIDL [msg] uidl(msg = None)
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| 58 |
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| 59 | Raises one exception: 'error_proto'.
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| 60 |
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| 61 | Instantiate with:
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| 62 | POP3(hostname, port=110)
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| 63 |
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| 64 | NB: the POP protocol locks the mailbox from user
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| 65 | authorization until QUIT, so be sure to get in, suck
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| 66 | the messages, and quit, each time you access the
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| 67 | mailbox.
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| 68 |
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| 69 | POP is a line-based protocol, which means large mail
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| 70 | messages consume lots of python cycles reading them
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| 71 | line-by-line.
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| 72 |
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| 73 | If it's available on your mail server, use IMAP4
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| 74 | instead, it doesn't suffer from the two problems
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| 75 | above.
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| 76 | """
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| 77 |
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| 78 |
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| 79 | def __init__(self, host, port = POP3_PORT):
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| 80 | self.host = host
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| 81 | self.port = port
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| 82 | msg = "getaddrinfo returns an empty list"
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| 83 | self.sock = None
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| 84 | for res in socket.getaddrinfo(self.host, self.port, 0, socket.SOCK_STREAM):
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| 85 | af, socktype, proto, canonname, sa = res
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| 86 | try:
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| 87 | self.sock = socket.socket(af, socktype, proto)
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| 88 | self.sock.connect(sa)
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| 89 | except socket.error, msg:
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| 90 | if self.sock:
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| 91 | self.sock.close()
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| 92 | self.sock = None
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| 93 | continue
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| 94 | break
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| 95 | if not self.sock:
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| 96 | raise socket.error, msg
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| 97 | self.file = self.sock.makefile('rb')
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| 98 | self._debugging = 0
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| 99 | self.welcome = self._getresp()
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| 100 |
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| 101 |
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| 102 | def _putline(self, line):
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| 103 | if self._debugging > 1: print '*put*', repr(line)
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| 104 | self.sock.sendall('%s%s' % (line, CRLF))
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| 105 |
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| 106 |
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| 107 | # Internal: send one command to the server (through _putline())
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| 108 |
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| 109 | def _putcmd(self, line):
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| 110 | if self._debugging: print '*cmd*', repr(line)
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| 111 | self._putline(line)
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| 112 |
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| 113 |
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| 114 | # Internal: return one line from the server, stripping CRLF.
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| 115 | # This is where all the CPU time of this module is consumed.
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| 116 | # Raise error_proto('-ERR EOF') if the connection is closed.
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| 117 |
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| 118 | def _getline(self):
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| 119 | line = self.file.readline()
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| 120 | if self._debugging > 1: print '*get*', repr(line)
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| 121 | if not line: raise error_proto('-ERR EOF')
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| 122 | octets = len(line)
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| 123 | # server can send any combination of CR & LF
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| 124 | # however, 'readline()' returns lines ending in LF
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| 125 | # so only possibilities are ...LF, ...CRLF, CR...LF
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| 126 | if line[-2:] == CRLF:
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| 127 | return line[:-2], octets
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| 128 | if line[0] == CR:
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| 129 | return line[1:-1], octets
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| 130 | return line[:-1], octets
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| 131 |
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| 132 |
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| 133 | # Internal: get a response from the server.
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| 134 | # Raise 'error_proto' if the response doesn't start with '+'.
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| 135 |
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| 136 | def _getresp(self):
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| 137 | resp, o = self._getline()
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| 138 | if self._debugging > 1: print '*resp*', repr(resp)
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| 139 | c = resp[:1]
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| 140 | if c != '+':
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| 141 | raise error_proto(resp)
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| 142 | return resp
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| 143 |
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| 144 |
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| 145 | # Internal: get a response plus following text from the server.
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| 146 |
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| 147 | def _getlongresp(self):
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| 148 | resp = self._getresp()
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| 149 | list = []; octets = 0
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| 150 | line, o = self._getline()
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| 151 | while line != '.':
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| 152 | if line[:2] == '..':
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| 153 | o = o-1
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| 154 | line = line[1:]
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| 155 | octets = octets + o
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| 156 | list.append(line)
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| 157 | line, o = self._getline()
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| 158 | return resp, list, octets
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| 159 |
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| 160 |
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| 161 | # Internal: send a command and get the response
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| 162 |
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| 163 | def _shortcmd(self, line):
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| 164 | self._putcmd(line)
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| 165 | return self._getresp()
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| 166 |
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| 167 |
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| 168 | # Internal: send a command and get the response plus following text
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| 169 |
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| 170 | def _longcmd(self, line):
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| 171 | self._putcmd(line)
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| 172 | return self._getlongresp()
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| 173 |
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| 174 |
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| 175 | # These can be useful:
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| 176 |
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| 177 | def getwelcome(self):
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| 178 | return self.welcome
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| 179 |
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| 180 |
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| 181 | def set_debuglevel(self, level):
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| 182 | self._debugging = level
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| 183 |
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| 184 |
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| 185 | # Here are all the POP commands:
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| 186 |
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| 187 | def user(self, user):
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| 188 | """Send user name, return response
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| 189 |
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| 190 | (should indicate password required).
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| 191 | """
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| 192 | return self._shortcmd('USER %s' % user)
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| 193 |
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| 194 |
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| 195 | def pass_(self, pswd):
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| 196 | """Send password, return response
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| 197 |
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| 198 | (response includes message count, mailbox size).
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| 199 |
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| 200 | NB: mailbox is locked by server from here to 'quit()'
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| 201 | """
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| 202 | return self._shortcmd('PASS %s' % pswd)
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| 203 |
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| 204 |
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| 205 | def stat(self):
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| 206 | """Get mailbox status.
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| 207 |
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| 208 | Result is tuple of 2 ints (message count, mailbox size)
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| 209 | """
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| 210 | retval = self._shortcmd('STAT')
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| 211 | rets = retval.split()
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| 212 | if self._debugging: print '*stat*', repr(rets)
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| 213 | numMessages = int(rets[1])
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| 214 | sizeMessages = int(rets[2])
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| 215 | return (numMessages, sizeMessages)
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| 216 |
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| 217 |
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| 218 | def list(self, which=None):
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| 219 | """Request listing, return result.
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| 220 |
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| 221 | Result without a message number argument is in form
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| 222 | ['response', ['mesg_num octets', ...], octets].
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| 223 |
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| 224 | Result when a message number argument is given is a
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| 225 | single response: the "scan listing" for that message.
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| 226 | """
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| 227 | if which is not None:
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| 228 | return self._shortcmd('LIST %s' % which)
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| 229 | return self._longcmd('LIST')
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| 230 |
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| 231 |
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| 232 | def retr(self, which):
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| 233 | """Retrieve whole message number 'which'.
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| 234 |
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| 235 | Result is in form ['response', ['line', ...], octets].
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| 236 | """
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| 237 | return self._longcmd('RETR %s' % which)
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| 238 |
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| 239 |
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| 240 | def dele(self, which):
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| 241 | """Delete message number 'which'.
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| 242 |
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| 243 | Result is 'response'.
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| 244 | """
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| 245 | return self._shortcmd('DELE %s' % which)
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| 246 |
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| 247 |
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| 248 | def noop(self):
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| 249 | """Does nothing.
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| 250 |
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| 251 | One supposes the response indicates the server is alive.
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| 252 | """
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| 253 | return self._shortcmd('NOOP')
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| 254 |
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| 255 |
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| 256 | def rset(self):
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| 257 | """Not sure what this does."""
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| 258 | return self._shortcmd('RSET')
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| 259 |
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| 260 |
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| 261 | def quit(self):
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| 262 | """Signoff: commit changes on server, unlock mailbox, close connection."""
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| 263 | try:
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| 264 | resp = self._shortcmd('QUIT')
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| 265 | except error_proto, val:
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| 266 | resp = val
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| 267 | self.file.close()
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| 268 | self.sock.close()
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| 269 | del self.file, self.sock
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| 270 | return resp
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| 271 |
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| 272 | #__del__ = quit
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| 273 |
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| 274 |
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| 275 | # optional commands:
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| 276 |
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| 277 | def rpop(self, user):
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| 278 | """Not sure what this does."""
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| 279 | return self._shortcmd('RPOP %s' % user)
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| 280 |
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| 281 |
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| 282 | timestamp = re.compile(r'\+OK.*(<[^>]+>)')
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| 283 |
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| 284 | def apop(self, user, secret):
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| 285 | """Authorisation
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| 286 |
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| 287 | - only possible if server has supplied a timestamp in initial greeting.
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| 288 |
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| 289 | Args:
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| 290 | user - mailbox user;
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| 291 | secret - secret shared between client and server.
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| 292 |
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| 293 | NB: mailbox is locked by server from here to 'quit()'
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| 294 | """
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| 295 | m = self.timestamp.match(self.welcome)
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| 296 | if not m:
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| 297 | raise error_proto('-ERR APOP not supported by server')
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| 298 | import hashlib
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| 299 | digest = hashlib.md5(m.group(1)+secret).digest()
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| 300 | digest = ''.join(map(lambda x:'%02x'%ord(x), digest))
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| 301 | return self._shortcmd('APOP %s %s' % (user, digest))
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| 302 |
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| 303 |
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| 304 | def top(self, which, howmuch):
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| 305 | """Retrieve message header of message number 'which'
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| 306 | and first 'howmuch' lines of message body.
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| 307 |
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| 308 | Result is in form ['response', ['line', ...], octets].
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| 309 | """
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| 310 | return self._longcmd('TOP %s %s' % (which, howmuch))
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| 311 |
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| 312 |
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| 313 | def uidl(self, which=None):
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| 314 | """Return message digest (unique id) list.
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| 315 |
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| 316 | If 'which', result contains unique id for that message
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| 317 | in the form 'response mesgnum uid', otherwise result is
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| 318 | the list ['response', ['mesgnum uid', ...], octets]
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| 319 | """
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| 320 | if which is not None:
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| 321 | return self._shortcmd('UIDL %s' % which)
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| 322 | return self._longcmd('UIDL')
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| 323 |
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| 324 | class POP3_SSL(POP3):
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| 325 | """POP3 client class over SSL connection
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| 326 |
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| 327 | Instantiate with: POP3_SSL(hostname, port=995, keyfile=None, certfile=None)
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| 328 |
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| 329 | hostname - the hostname of the pop3 over ssl server
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| 330 | port - port number
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| 331 | keyfile - PEM formatted file that countains your private key
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| 332 | certfile - PEM formatted certificate chain file
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| 333 |
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| 334 | See the methods of the parent class POP3 for more documentation.
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| 335 | """
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| 336 |
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| 337 | def __init__(self, host, port = POP3_SSL_PORT, keyfile = None, certfile = None):
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| 338 | self.host = host
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| 339 | self.port = port
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| 340 | self.keyfile = keyfile
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| 341 | self.certfile = certfile
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| 342 | self.buffer = ""
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| 343 | msg = "getaddrinfo returns an empty list"
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| 344 | self.sock = None
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| 345 | for res in socket.getaddrinfo(self.host, self.port, 0, socket.SOCK_STREAM):
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| 346 | af, socktype, proto, canonname, sa = res
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| 347 | try:
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| 348 | self.sock = socket.socket(af, socktype, proto)
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| 349 | self.sock.connect(sa)
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| 350 | except socket.error, msg:
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| 351 | if self.sock:
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| 352 | self.sock.close()
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| 353 | self.sock = None
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| 354 | continue
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| 355 | break
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| 356 | if not self.sock:
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| 357 | raise socket.error, msg
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| 358 | self.file = self.sock.makefile('rb')
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| 359 | self.sslobj = socket.ssl(self.sock, self.keyfile, self.certfile)
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| 360 | self._debugging = 0
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| 361 | self.welcome = self._getresp()
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| 362 |
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| 363 | def _fillBuffer(self):
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| 364 | localbuf = self.sslobj.read()
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| 365 | if len(localbuf) == 0:
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| 366 | raise error_proto('-ERR EOF')
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| 367 | self.buffer += localbuf
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| 368 |
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| 369 | def _getline(self):
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| 370 | line = ""
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| 371 | renewline = re.compile(r'.*?\n')
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| 372 | match = renewline.match(self.buffer)
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| 373 | while not match:
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| 374 | self._fillBuffer()
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| 375 | match = renewline.match(self.buffer)
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| 376 | line = match.group(0)
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| 377 | self.buffer = renewline.sub('' ,self.buffer, 1)
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| 378 | if self._debugging > 1: print '*get*', repr(line)
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| 379 |
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| 380 | octets = len(line)
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| 381 | if line[-2:] == CRLF:
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| 382 | return line[:-2], octets
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| 383 | if line[0] == CR:
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| 384 | return line[1:-1], octets
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| 385 | return line[:-1], octets
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| 386 |
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| 387 | def _putline(self, line):
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| 388 | if self._debugging > 1: print '*put*', repr(line)
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| 389 | line += CRLF
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| 390 | bytes = len(line)
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| 391 | while bytes > 0:
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| 392 | sent = self.sslobj.write(line)
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| 393 | if sent == bytes:
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| 394 | break # avoid copy
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| 395 | line = line[sent:]
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| 396 | bytes = bytes - sent
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| 397 |
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| 398 | def quit(self):
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| 399 | """Signoff: commit changes on server, unlock mailbox, close connection."""
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| 400 | try:
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| 401 | resp = self._shortcmd('QUIT')
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| 402 | except error_proto, val:
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| 403 | resp = val
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| 404 | self.sock.close()
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| 405 | del self.sslobj, self.sock
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| 406 | return resp
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| 407 |
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| 408 |
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| 409 | if __name__ == "__main__":
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| 410 | import sys
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| 411 | a = POP3(sys.argv[1])
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| 412 | print a.getwelcome()
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| 413 | a.user(sys.argv[2])
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| 414 | a.pass_(sys.argv[3])
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| 415 | a.list()
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| 416 | (numMsgs, totalSize) = a.stat()
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| 417 | for i in range(1, numMsgs + 1):
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| 418 | (header, msg, octets) = a.retr(i)
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| 419 | print "Message %d:" % i
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| 420 | for line in msg:
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| 421 | print ' ' + line
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| 422 | print '-----------------------'
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| 423 | a.quit()
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