| paul@49 | 1 | #!/usr/bin/env python |
| paul@49 | 2 | |
| paul@146 | 3 | """ |
| paul@146 | 4 | A processing framework for iMIP content. |
| paul@146 | 5 | |
| paul@146 | 6 | Copyright (C) 2014, 2015 Paul Boddie <paul@boddie.org.uk> |
| paul@146 | 7 | |
| paul@146 | 8 | This program is free software; you can redistribute it and/or modify it under |
| paul@146 | 9 | the terms of the GNU General Public License as published by the Free Software |
| paul@146 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@146 | 11 | version. |
| paul@146 | 12 | |
| paul@146 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@146 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@146 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@146 | 16 | details. |
| paul@146 | 17 | |
| paul@146 | 18 | You should have received a copy of the GNU General Public License along with |
| paul@146 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@146 | 20 | """ |
| paul@146 | 21 | |
| paul@49 | 22 | from email import message_from_file |
| paul@129 | 23 | from imiptools.content import get_addresses, handle_itip_part |
| paul@83 | 24 | from imiptools.mail import Messenger |
| paul@49 | 25 | import sys |
| paul@49 | 26 | |
| paul@49 | 27 | # Postfix exit codes. |
| paul@49 | 28 | |
| paul@49 | 29 | EX_TEMPFAIL = 75 |
| paul@49 | 30 | |
| paul@49 | 31 | # Permitted iTIP content types. |
| paul@49 | 32 | |
| paul@49 | 33 | itip_content_types = [ |
| paul@49 | 34 | "text/calendar", # from RFC 6047 |
| paul@49 | 35 | "text/x-vcalendar", "application/ics", # other possibilities |
| paul@49 | 36 | ] |
| paul@49 | 37 | |
| paul@49 | 38 | # Processing of incoming messages. |
| paul@49 | 39 | |
| paul@49 | 40 | def get_all_values(msg, key): |
| paul@49 | 41 | l = [] |
| paul@49 | 42 | for v in msg.get_all(key) or []: |
| paul@49 | 43 | l += [s.strip() for s in v.split(",")] |
| paul@49 | 44 | return l |
| paul@49 | 45 | |
| paul@49 | 46 | class Processor: |
| paul@49 | 47 | |
| paul@49 | 48 | "The processing framework." |
| paul@49 | 49 | |
| paul@82 | 50 | def __init__(self, handlers, messenger=None): |
| paul@49 | 51 | self.handlers = handlers |
| paul@82 | 52 | self.messenger = messenger or Messenger() |
| paul@60 | 53 | self.lmtp_socket = None |
| paul@49 | 54 | |
| paul@96 | 55 | def process(self, f, original_recipients, recipients, outgoing_only): |
| paul@49 | 56 | |
| paul@49 | 57 | """ |
| paul@49 | 58 | Process content from the stream 'f' accompanied by the given |
| paul@49 | 59 | 'original_recipients' and 'recipients'. |
| paul@49 | 60 | """ |
| paul@49 | 61 | |
| paul@49 | 62 | msg = message_from_file(f) |
| paul@129 | 63 | senders = get_addresses(msg.get_all("Reply-To") or msg.get_all("From")) |
| paul@129 | 64 | original_recipients = original_recipients or get_addresses(get_all_values(msg, "To")) |
| paul@49 | 65 | |
| paul@49 | 66 | # Handle messages with iTIP parts. |
| paul@49 | 67 | |
| paul@60 | 68 | all_responses = [] |
| paul@60 | 69 | handled = False |
| paul@49 | 70 | |
| paul@49 | 71 | for part in msg.walk(): |
| paul@49 | 72 | if part.get_content_type() in itip_content_types and \ |
| paul@49 | 73 | part.get_param("method"): |
| paul@49 | 74 | |
| paul@89 | 75 | all_responses += handle_itip_part(part, senders, original_recipients, self.handlers, self.messenger) |
| paul@60 | 76 | handled = True |
| paul@49 | 77 | |
| paul@96 | 78 | # When processing outgoing messages, no replies or deliveries are |
| paul@96 | 79 | # performed. |
| paul@96 | 80 | |
| paul@96 | 81 | if outgoing_only: |
| paul@96 | 82 | return |
| paul@96 | 83 | |
| paul@59 | 84 | # Pack any returned parts into a single message. |
| paul@49 | 85 | |
| paul@60 | 86 | if all_responses: |
| paul@60 | 87 | outgoing_parts = [] |
| paul@60 | 88 | forwarded_parts = [] |
| paul@60 | 89 | |
| paul@60 | 90 | for outgoing, part in all_responses: |
| paul@60 | 91 | if outgoing: |
| paul@60 | 92 | outgoing_parts.append(part) |
| paul@60 | 93 | else: |
| paul@60 | 94 | forwarded_parts.append(part) |
| paul@60 | 95 | |
| paul@60 | 96 | # Reply using any outgoing parts in a new message. |
| paul@60 | 97 | |
| paul@60 | 98 | if outgoing_parts: |
| paul@82 | 99 | message = self.messenger.make_message(outgoing_parts, senders) |
| paul@49 | 100 | |
| paul@60 | 101 | if "-d" in sys.argv: |
| paul@106 | 102 | print >>sys.stderr, "Outgoing parts..." |
| paul@60 | 103 | print message |
| paul@60 | 104 | else: |
| paul@82 | 105 | self.messenger.sendmail(senders, message.as_string()) |
| paul@60 | 106 | |
| paul@60 | 107 | # Forward messages to their recipients using the existing message. |
| paul@60 | 108 | |
| paul@60 | 109 | if forwarded_parts: |
| paul@82 | 110 | message = self.messenger.wrap_message(msg, forwarded_parts) |
| paul@60 | 111 | |
| paul@60 | 112 | if "-d" in sys.argv: |
| paul@106 | 113 | print >>sys.stderr, "Forwarded parts..." |
| paul@64 | 114 | print message |
| paul@60 | 115 | elif self.lmtp_socket: |
| paul@86 | 116 | self.messenger.sendmail(original_recipients, message.as_string(), lmtp_socket=self.lmtp_socket) |
| paul@60 | 117 | |
| paul@60 | 118 | # Unhandled messages are delivered as they are. |
| paul@60 | 119 | |
| paul@60 | 120 | if not handled: |
| paul@49 | 121 | if "-d" in sys.argv: |
| paul@106 | 122 | print >>sys.stderr, "Unhandled parts..." |
| paul@60 | 123 | print msg |
| paul@60 | 124 | elif self.lmtp_socket: |
| paul@86 | 125 | self.messenger.sendmail(original_recipients, msg.as_string(), lmtp_socket=self.lmtp_socket) |
| paul@64 | 126 | |
| paul@49 | 127 | def process_args(self, args, stream): |
| paul@49 | 128 | |
| paul@49 | 129 | """ |
| paul@49 | 130 | Interpret the given program arguments 'args' and process input from the |
| paul@49 | 131 | given 'stream'. |
| paul@49 | 132 | """ |
| paul@49 | 133 | |
| paul@49 | 134 | # Obtain the different kinds of recipients plus sender address. |
| paul@49 | 135 | |
| paul@49 | 136 | original_recipients = [] |
| paul@49 | 137 | recipients = [] |
| paul@49 | 138 | senders = [] |
| paul@60 | 139 | lmtp = [] |
| paul@96 | 140 | outgoing_only = False |
| paul@49 | 141 | |
| paul@49 | 142 | l = [] |
| paul@49 | 143 | |
| paul@49 | 144 | for arg in args: |
| paul@49 | 145 | |
| paul@96 | 146 | # Detect outgoing processing mode. |
| paul@96 | 147 | |
| paul@96 | 148 | if arg == "-O": |
| paul@96 | 149 | outgoing_only = True |
| paul@96 | 150 | |
| paul@49 | 151 | # Switch to collecting recipients. |
| paul@49 | 152 | |
| paul@49 | 153 | if arg == "-o": |
| paul@49 | 154 | l = original_recipients |
| paul@49 | 155 | elif arg == "-r": |
| paul@49 | 156 | l = recipients |
| paul@49 | 157 | |
| paul@49 | 158 | # Switch to collecting senders. |
| paul@49 | 159 | |
| paul@49 | 160 | elif arg == "-s": |
| paul@49 | 161 | l = senders |
| paul@49 | 162 | |
| paul@60 | 163 | # Switch to getting the LMTP socket. |
| paul@60 | 164 | |
| paul@60 | 165 | elif arg == "-l": |
| paul@60 | 166 | l = lmtp |
| paul@60 | 167 | |
| paul@49 | 168 | # Ignore debugging options. |
| paul@49 | 169 | |
| paul@49 | 170 | elif arg == "-d": |
| paul@49 | 171 | pass |
| paul@49 | 172 | else: |
| paul@49 | 173 | l.append(arg) |
| paul@49 | 174 | |
| paul@82 | 175 | self.messenger.sender = senders and senders[0] or self.messenger.sender |
| paul@60 | 176 | self.lmtp_socket = lmtp and lmtp[0] or None |
| paul@96 | 177 | self.process(stream, original_recipients, recipients, outgoing_only) |
| paul@49 | 178 | |
| paul@49 | 179 | def __call__(self): |
| paul@49 | 180 | |
| paul@49 | 181 | """ |
| paul@49 | 182 | Obtain arguments from the command line to initialise the processor |
| paul@49 | 183 | before invoking it. |
| paul@49 | 184 | """ |
| paul@49 | 185 | |
| paul@49 | 186 | args = sys.argv[1:] |
| paul@49 | 187 | |
| paul@49 | 188 | if "-d" in args: |
| paul@49 | 189 | self.process_args(args, sys.stdin) |
| paul@49 | 190 | else: |
| paul@49 | 191 | try: |
| paul@49 | 192 | self.process_args(args, sys.stdin) |
| paul@49 | 193 | except SystemExit, value: |
| paul@49 | 194 | sys.exit(value) |
| paul@49 | 195 | except Exception, exc: |
| paul@60 | 196 | if "-v" in args: |
| paul@60 | 197 | raise |
| paul@49 | 198 | type, value, tb = sys.exc_info() |
| paul@49 | 199 | print >>sys.stderr, "Exception %s at %d" % (exc, tb.tb_lineno) |
| paul@82 | 200 | #import traceback |
| paul@82 | 201 | #traceback.print_exc(file=open("/tmp/mail.log", "a")) |
| paul@49 | 202 | sys.exit(EX_TEMPFAIL) |
| paul@49 | 203 | sys.exit(0) |
| paul@49 | 204 | |
| paul@49 | 205 | # vim: tabstop=4 expandtab shiftwidth=4 |
