paul@49 | 1 | #!/usr/bin/env python |
paul@49 | 2 | |
paul@49 | 3 | from email import message_from_file |
paul@129 | 4 | from imiptools.content import get_addresses, handle_itip_part |
paul@83 | 5 | from imiptools.mail import Messenger |
paul@49 | 6 | import sys |
paul@49 | 7 | |
paul@49 | 8 | # Postfix exit codes. |
paul@49 | 9 | |
paul@49 | 10 | EX_TEMPFAIL = 75 |
paul@49 | 11 | |
paul@49 | 12 | # Permitted iTIP content types. |
paul@49 | 13 | |
paul@49 | 14 | itip_content_types = [ |
paul@49 | 15 | "text/calendar", # from RFC 6047 |
paul@49 | 16 | "text/x-vcalendar", "application/ics", # other possibilities |
paul@49 | 17 | ] |
paul@49 | 18 | |
paul@49 | 19 | # Processing of incoming messages. |
paul@49 | 20 | |
paul@49 | 21 | def get_all_values(msg, key): |
paul@49 | 22 | l = [] |
paul@49 | 23 | for v in msg.get_all(key) or []: |
paul@49 | 24 | l += [s.strip() for s in v.split(",")] |
paul@49 | 25 | return l |
paul@49 | 26 | |
paul@49 | 27 | class Processor: |
paul@49 | 28 | |
paul@49 | 29 | "The processing framework." |
paul@49 | 30 | |
paul@82 | 31 | def __init__(self, handlers, messenger=None): |
paul@49 | 32 | self.handlers = handlers |
paul@82 | 33 | self.messenger = messenger or Messenger() |
paul@60 | 34 | self.lmtp_socket = None |
paul@49 | 35 | |
paul@96 | 36 | def process(self, f, original_recipients, recipients, outgoing_only): |
paul@49 | 37 | |
paul@49 | 38 | """ |
paul@49 | 39 | Process content from the stream 'f' accompanied by the given |
paul@49 | 40 | 'original_recipients' and 'recipients'. |
paul@49 | 41 | """ |
paul@49 | 42 | |
paul@49 | 43 | msg = message_from_file(f) |
paul@129 | 44 | senders = get_addresses(msg.get_all("Reply-To") or msg.get_all("From")) |
paul@129 | 45 | original_recipients = original_recipients or get_addresses(get_all_values(msg, "To")) |
paul@49 | 46 | |
paul@49 | 47 | # Handle messages with iTIP parts. |
paul@49 | 48 | |
paul@60 | 49 | all_responses = [] |
paul@60 | 50 | handled = False |
paul@49 | 51 | |
paul@49 | 52 | for part in msg.walk(): |
paul@49 | 53 | if part.get_content_type() in itip_content_types and \ |
paul@49 | 54 | part.get_param("method"): |
paul@49 | 55 | |
paul@89 | 56 | all_responses += handle_itip_part(part, senders, original_recipients, self.handlers, self.messenger) |
paul@60 | 57 | handled = True |
paul@49 | 58 | |
paul@96 | 59 | # When processing outgoing messages, no replies or deliveries are |
paul@96 | 60 | # performed. |
paul@96 | 61 | |
paul@96 | 62 | if outgoing_only: |
paul@96 | 63 | return |
paul@96 | 64 | |
paul@59 | 65 | # Pack any returned parts into a single message. |
paul@49 | 66 | |
paul@60 | 67 | if all_responses: |
paul@60 | 68 | outgoing_parts = [] |
paul@60 | 69 | forwarded_parts = [] |
paul@60 | 70 | |
paul@60 | 71 | for outgoing, part in all_responses: |
paul@60 | 72 | if outgoing: |
paul@60 | 73 | outgoing_parts.append(part) |
paul@60 | 74 | else: |
paul@60 | 75 | forwarded_parts.append(part) |
paul@60 | 76 | |
paul@60 | 77 | # Reply using any outgoing parts in a new message. |
paul@60 | 78 | |
paul@60 | 79 | if outgoing_parts: |
paul@82 | 80 | message = self.messenger.make_message(outgoing_parts, senders) |
paul@49 | 81 | |
paul@60 | 82 | if "-d" in sys.argv: |
paul@106 | 83 | print >>sys.stderr, "Outgoing parts..." |
paul@60 | 84 | print message |
paul@60 | 85 | else: |
paul@82 | 86 | self.messenger.sendmail(senders, message.as_string()) |
paul@60 | 87 | |
paul@60 | 88 | # Forward messages to their recipients using the existing message. |
paul@60 | 89 | |
paul@60 | 90 | if forwarded_parts: |
paul@82 | 91 | message = self.messenger.wrap_message(msg, forwarded_parts) |
paul@60 | 92 | |
paul@60 | 93 | if "-d" in sys.argv: |
paul@106 | 94 | print >>sys.stderr, "Forwarded parts..." |
paul@64 | 95 | print message |
paul@60 | 96 | elif self.lmtp_socket: |
paul@86 | 97 | self.messenger.sendmail(original_recipients, message.as_string(), lmtp_socket=self.lmtp_socket) |
paul@60 | 98 | |
paul@60 | 99 | # Unhandled messages are delivered as they are. |
paul@60 | 100 | |
paul@60 | 101 | if not handled: |
paul@49 | 102 | if "-d" in sys.argv: |
paul@106 | 103 | print >>sys.stderr, "Unhandled parts..." |
paul@60 | 104 | print msg |
paul@60 | 105 | elif self.lmtp_socket: |
paul@86 | 106 | self.messenger.sendmail(original_recipients, msg.as_string(), lmtp_socket=self.lmtp_socket) |
paul@64 | 107 | |
paul@49 | 108 | def process_args(self, args, stream): |
paul@49 | 109 | |
paul@49 | 110 | """ |
paul@49 | 111 | Interpret the given program arguments 'args' and process input from the |
paul@49 | 112 | given 'stream'. |
paul@49 | 113 | """ |
paul@49 | 114 | |
paul@49 | 115 | # Obtain the different kinds of recipients plus sender address. |
paul@49 | 116 | |
paul@49 | 117 | original_recipients = [] |
paul@49 | 118 | recipients = [] |
paul@49 | 119 | senders = [] |
paul@60 | 120 | lmtp = [] |
paul@96 | 121 | outgoing_only = False |
paul@49 | 122 | |
paul@49 | 123 | l = [] |
paul@49 | 124 | |
paul@49 | 125 | for arg in args: |
paul@49 | 126 | |
paul@96 | 127 | # Detect outgoing processing mode. |
paul@96 | 128 | |
paul@96 | 129 | if arg == "-O": |
paul@96 | 130 | outgoing_only = True |
paul@96 | 131 | |
paul@49 | 132 | # Switch to collecting recipients. |
paul@49 | 133 | |
paul@49 | 134 | if arg == "-o": |
paul@49 | 135 | l = original_recipients |
paul@49 | 136 | elif arg == "-r": |
paul@49 | 137 | l = recipients |
paul@49 | 138 | |
paul@49 | 139 | # Switch to collecting senders. |
paul@49 | 140 | |
paul@49 | 141 | elif arg == "-s": |
paul@49 | 142 | l = senders |
paul@49 | 143 | |
paul@60 | 144 | # Switch to getting the LMTP socket. |
paul@60 | 145 | |
paul@60 | 146 | elif arg == "-l": |
paul@60 | 147 | l = lmtp |
paul@60 | 148 | |
paul@49 | 149 | # Ignore debugging options. |
paul@49 | 150 | |
paul@49 | 151 | elif arg == "-d": |
paul@49 | 152 | pass |
paul@49 | 153 | else: |
paul@49 | 154 | l.append(arg) |
paul@49 | 155 | |
paul@82 | 156 | self.messenger.sender = senders and senders[0] or self.messenger.sender |
paul@60 | 157 | self.lmtp_socket = lmtp and lmtp[0] or None |
paul@96 | 158 | self.process(stream, original_recipients, recipients, outgoing_only) |
paul@49 | 159 | |
paul@49 | 160 | def __call__(self): |
paul@49 | 161 | |
paul@49 | 162 | """ |
paul@49 | 163 | Obtain arguments from the command line to initialise the processor |
paul@49 | 164 | before invoking it. |
paul@49 | 165 | """ |
paul@49 | 166 | |
paul@49 | 167 | args = sys.argv[1:] |
paul@49 | 168 | |
paul@49 | 169 | if "-d" in args: |
paul@49 | 170 | self.process_args(args, sys.stdin) |
paul@49 | 171 | else: |
paul@49 | 172 | try: |
paul@49 | 173 | self.process_args(args, sys.stdin) |
paul@49 | 174 | except SystemExit, value: |
paul@49 | 175 | sys.exit(value) |
paul@49 | 176 | except Exception, exc: |
paul@60 | 177 | if "-v" in args: |
paul@60 | 178 | raise |
paul@49 | 179 | type, value, tb = sys.exc_info() |
paul@49 | 180 | print >>sys.stderr, "Exception %s at %d" % (exc, tb.tb_lineno) |
paul@82 | 181 | #import traceback |
paul@82 | 182 | #traceback.print_exc(file=open("/tmp/mail.log", "a")) |
paul@49 | 183 | sys.exit(EX_TEMPFAIL) |
paul@49 | 184 | sys.exit(0) |
paul@49 | 185 | |
paul@49 | 186 | # vim: tabstop=4 expandtab shiftwidth=4 |