| 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@749 | 23 | from imiptools import config |
| paul@604 | 24 | from imiptools.client import Client |
| paul@213 | 25 | from imiptools.content import handle_itip_part |
| paul@604 | 26 | from imiptools.data import get_address, get_addresses, get_uri |
| paul@83 | 27 | from imiptools.mail import Messenger |
| paul@223 | 28 | import imip_store |
| paul@49 | 29 | import sys |
| paul@49 | 30 | |
| paul@49 | 31 | # Postfix exit codes. |
| paul@49 | 32 | |
| paul@49 | 33 | EX_TEMPFAIL = 75 |
| paul@49 | 34 | |
| paul@49 | 35 | # Permitted iTIP content types. |
| paul@49 | 36 | |
| paul@49 | 37 | itip_content_types = [ |
| paul@49 | 38 | "text/calendar", # from RFC 6047 |
| paul@49 | 39 | "text/x-vcalendar", "application/ics", # other possibilities |
| paul@49 | 40 | ] |
| paul@49 | 41 | |
| paul@49 | 42 | # Processing of incoming messages. |
| paul@49 | 43 | |
| paul@49 | 44 | def get_all_values(msg, key): |
| paul@49 | 45 | l = [] |
| paul@49 | 46 | for v in msg.get_all(key) or []: |
| paul@49 | 47 | l += [s.strip() for s in v.split(",")] |
| paul@49 | 48 | return l |
| paul@49 | 49 | |
| paul@49 | 50 | class Processor: |
| paul@49 | 51 | |
| paul@49 | 52 | "The processing framework." |
| paul@49 | 53 | |
| paul@822 | 54 | def __init__(self, handlers, outgoing_only=False): |
| paul@49 | 55 | self.handlers = handlers |
| paul@822 | 56 | self.outgoing_only = outgoing_only |
| paul@607 | 57 | self.messenger = None |
| paul@60 | 58 | self.lmtp_socket = None |
| paul@563 | 59 | self.store_dir = None |
| paul@563 | 60 | self.publishing_dir = None |
| paul@639 | 61 | self.preferences_dir = None |
| paul@563 | 62 | self.debug = False |
| paul@49 | 63 | |
| paul@569 | 64 | def get_store(self): |
| paul@598 | 65 | return imip_store.FileStore(self.store_dir) |
| paul@569 | 66 | |
| paul@569 | 67 | def get_publisher(self): |
| paul@569 | 68 | return self.publishing_dir and imip_store.FilePublisher(self.publishing_dir) or None |
| paul@569 | 69 | |
| paul@822 | 70 | def process(self, f, original_recipients): |
| paul@49 | 71 | |
| paul@49 | 72 | """ |
| paul@49 | 73 | Process content from the stream 'f' accompanied by the given |
| paul@515 | 74 | 'original_recipients'. |
| paul@49 | 75 | """ |
| paul@49 | 76 | |
| paul@49 | 77 | msg = message_from_file(f) |
| paul@677 | 78 | senders = get_addresses(get_all_values(msg, "Reply-To") or get_all_values(msg, "From") or []) |
| paul@49 | 79 | |
| paul@604 | 80 | messenger = self.messenger |
| paul@604 | 81 | store = self.get_store() |
| paul@604 | 82 | publisher = self.get_publisher() |
| paul@639 | 83 | preferences_dir = self.preferences_dir |
| paul@604 | 84 | |
| paul@49 | 85 | # Handle messages with iTIP parts. |
| paul@438 | 86 | # Typically, the details of recipients are of interest in handling |
| paul@438 | 87 | # messages. |
| paul@49 | 88 | |
| paul@822 | 89 | if not self.outgoing_only: |
| paul@438 | 90 | original_recipients = original_recipients or get_addresses(get_all_values(msg, "To") or []) |
| paul@438 | 91 | for recipient in original_recipients: |
| paul@822 | 92 | Recipient(get_uri(recipient), messenger, store, publisher, preferences_dir, self.handlers, self.outgoing_only, self.debug |
| paul@822 | 93 | ).process(msg, senders) |
| paul@438 | 94 | |
| paul@438 | 95 | # However, outgoing messages do not usually presume anything about the |
| paul@832 | 96 | # eventual recipients and focus on the sender instead. If possible, the |
| paul@832 | 97 | # sender is identified, but since this may be the calendar system (and |
| paul@832 | 98 | # the actual sender is defined in the object), and since the recipient |
| paul@832 | 99 | # may be in a Bcc header that is not available here, it may be left as |
| paul@832 | 100 | # None and deduced from the object content later. |
| paul@438 | 101 | |
| paul@438 | 102 | else: |
| paul@832 | 103 | senders = [sender for sender in get_addresses(get_all_values(msg, "From") or []) if sender != config.MESSAGE_SENDER] |
| paul@832 | 104 | Recipient(senders and senders[0] or None, messenger, store, publisher, preferences_dir, self.handlers, self.outgoing_only, self.debug |
| paul@822 | 105 | ).process(msg, senders) |
| paul@229 | 106 | |
| paul@49 | 107 | def process_args(self, args, stream): |
| paul@49 | 108 | |
| paul@49 | 109 | """ |
| paul@49 | 110 | Interpret the given program arguments 'args' and process input from the |
| paul@49 | 111 | given 'stream'. |
| paul@49 | 112 | """ |
| paul@49 | 113 | |
| paul@49 | 114 | # Obtain the different kinds of recipients plus sender address. |
| paul@49 | 115 | |
| paul@49 | 116 | original_recipients = [] |
| paul@49 | 117 | recipients = [] |
| paul@49 | 118 | senders = [] |
| paul@60 | 119 | lmtp = [] |
| paul@563 | 120 | store_dir = [] |
| paul@563 | 121 | publishing_dir = [] |
| paul@639 | 122 | preferences_dir = [] |
| paul@666 | 123 | local_smtp = False |
| paul@49 | 124 | |
| paul@49 | 125 | l = [] |
| paul@49 | 126 | |
| paul@49 | 127 | for arg in args: |
| paul@49 | 128 | |
| paul@49 | 129 | # Switch to collecting recipients. |
| paul@49 | 130 | |
| paul@822 | 131 | if arg == "-o": |
| paul@49 | 132 | l = original_recipients |
| paul@49 | 133 | |
| paul@49 | 134 | # Switch to collecting senders. |
| paul@49 | 135 | |
| paul@49 | 136 | elif arg == "-s": |
| paul@49 | 137 | l = senders |
| paul@49 | 138 | |
| paul@60 | 139 | # Switch to getting the LMTP socket. |
| paul@60 | 140 | |
| paul@60 | 141 | elif arg == "-l": |
| paul@60 | 142 | l = lmtp |
| paul@60 | 143 | |
| paul@666 | 144 | # Detect sending to local users via SMTP. |
| paul@666 | 145 | |
| paul@666 | 146 | elif arg == "-L": |
| paul@666 | 147 | local_smtp = True |
| paul@666 | 148 | |
| paul@563 | 149 | # Switch to getting the store directory. |
| paul@563 | 150 | |
| paul@563 | 151 | elif arg == "-S": |
| paul@563 | 152 | l = store_dir |
| paul@563 | 153 | |
| paul@563 | 154 | # Switch to getting the publishing directory. |
| paul@563 | 155 | |
| paul@563 | 156 | elif arg == "-P": |
| paul@563 | 157 | l = publishing_dir |
| paul@563 | 158 | |
| paul@639 | 159 | # Switch to getting the preferences directory. |
| paul@639 | 160 | |
| paul@639 | 161 | elif arg == "-p": |
| paul@639 | 162 | l = preferences_dir |
| paul@639 | 163 | |
| paul@49 | 164 | # Ignore debugging options. |
| paul@49 | 165 | |
| paul@49 | 166 | elif arg == "-d": |
| paul@563 | 167 | self.debug = True |
| paul@49 | 168 | else: |
| paul@49 | 169 | l.append(arg) |
| paul@49 | 170 | |
| paul@666 | 171 | self.messenger = Messenger(lmtp_socket=lmtp and lmtp[0] or None, local_smtp=local_smtp, sender=senders and senders[0] or None) |
| paul@563 | 172 | self.store_dir = store_dir and store_dir[0] or None |
| paul@563 | 173 | self.publishing_dir = publishing_dir and publishing_dir[0] or None |
| paul@639 | 174 | self.preferences_dir = preferences_dir and preferences_dir[0] or None |
| paul@822 | 175 | self.process(stream, original_recipients) |
| paul@49 | 176 | |
| paul@49 | 177 | def __call__(self): |
| paul@49 | 178 | |
| paul@49 | 179 | """ |
| paul@49 | 180 | Obtain arguments from the command line to initialise the processor |
| paul@49 | 181 | before invoking it. |
| paul@49 | 182 | """ |
| paul@49 | 183 | |
| paul@49 | 184 | args = sys.argv[1:] |
| paul@49 | 185 | |
| paul@49 | 186 | if "-d" in args: |
| paul@49 | 187 | self.process_args(args, sys.stdin) |
| paul@49 | 188 | else: |
| paul@49 | 189 | try: |
| paul@49 | 190 | self.process_args(args, sys.stdin) |
| paul@49 | 191 | except SystemExit, value: |
| paul@49 | 192 | sys.exit(value) |
| paul@49 | 193 | except Exception, exc: |
| paul@60 | 194 | if "-v" in args: |
| paul@60 | 195 | raise |
| paul@49 | 196 | type, value, tb = sys.exc_info() |
| paul@310 | 197 | while tb.tb_next: |
| paul@310 | 198 | tb = tb.tb_next |
| paul@310 | 199 | f = tb.tb_frame |
| paul@310 | 200 | co = f and f.f_code |
| paul@310 | 201 | filename = co and co.co_filename |
| paul@310 | 202 | print >>sys.stderr, "Exception %s at %d in %s" % (exc, tb.tb_lineno, filename) |
| paul@82 | 203 | #import traceback |
| paul@82 | 204 | #traceback.print_exc(file=open("/tmp/mail.log", "a")) |
| paul@49 | 205 | sys.exit(EX_TEMPFAIL) |
| paul@49 | 206 | sys.exit(0) |
| paul@49 | 207 | |
| paul@604 | 208 | class Recipient(Client): |
| paul@604 | 209 | |
| paul@604 | 210 | "A processor acting as a client on behalf of a recipient." |
| paul@604 | 211 | |
| paul@822 | 212 | def __init__(self, user, messenger, store, publisher, preferences_dir, handlers, outgoing_only, debug): |
| paul@604 | 213 | |
| paul@604 | 214 | """ |
| paul@604 | 215 | Initialise the recipient with the given 'user' identity, 'messenger', |
| paul@822 | 216 | 'store', 'publisher', 'preferences_dir', 'handlers', 'outgoing_only' and |
| paul@822 | 217 | 'debug' status. |
| paul@604 | 218 | """ |
| paul@604 | 219 | |
| paul@639 | 220 | Client.__init__(self, user, messenger, store, publisher, preferences_dir) |
| paul@607 | 221 | self.handlers = handlers |
| paul@822 | 222 | self.outgoing_only = outgoing_only |
| paul@607 | 223 | self.debug = debug |
| paul@604 | 224 | |
| paul@822 | 225 | def process(self, msg, senders): |
| paul@604 | 226 | |
| paul@604 | 227 | """ |
| paul@604 | 228 | Process the given 'msg' for a single recipient, having the given |
| paul@822 | 229 | 'senders'. |
| paul@604 | 230 | |
| paul@604 | 231 | Processing individually means that contributions to resulting messages |
| paul@604 | 232 | may be constructed according to individual preferences. |
| paul@604 | 233 | """ |
| paul@604 | 234 | |
| paul@604 | 235 | handlers = dict([(name, cls(senders, self.user and get_address(self.user), |
| paul@639 | 236 | self.messenger, self.store, self.publisher, |
| paul@639 | 237 | self.preferences_dir)) |
| paul@607 | 238 | for name, cls in self.handlers]) |
| paul@604 | 239 | handled = False |
| paul@604 | 240 | |
| paul@667 | 241 | # Check for participating recipients. Non-participating recipients will |
| paul@667 | 242 | # have their messages left as being unhandled. |
| paul@667 | 243 | |
| paul@822 | 244 | if self.outgoing_only or self.is_participating(): |
| paul@667 | 245 | |
| paul@667 | 246 | # Check for returned messages. |
| paul@665 | 247 | |
| paul@665 | 248 | for part in msg.walk(): |
| paul@667 | 249 | if part.get_content_type() == "message/delivery-status": |
| paul@667 | 250 | break |
| paul@667 | 251 | else: |
| paul@667 | 252 | for part in msg.walk(): |
| paul@667 | 253 | if part.get_content_type() in itip_content_types and \ |
| paul@667 | 254 | part.get_param("method"): |
| paul@604 | 255 | |
| paul@667 | 256 | handle_itip_part(part, handlers) |
| paul@667 | 257 | handled = True |
| paul@604 | 258 | |
| paul@604 | 259 | # When processing outgoing messages, no replies or deliveries are |
| paul@604 | 260 | # performed. |
| paul@604 | 261 | |
| paul@822 | 262 | if self.outgoing_only: |
| paul@604 | 263 | return |
| paul@604 | 264 | |
| paul@604 | 265 | # Get responses from the handlers. |
| paul@604 | 266 | |
| paul@604 | 267 | all_responses = [] |
| paul@604 | 268 | for handler in handlers.values(): |
| paul@604 | 269 | all_responses += handler.get_results() |
| paul@604 | 270 | |
| paul@604 | 271 | # Pack any returned parts into messages. |
| paul@604 | 272 | |
| paul@604 | 273 | if all_responses: |
| paul@604 | 274 | outgoing_parts = {} |
| paul@604 | 275 | forwarded_parts = [] |
| paul@604 | 276 | |
| paul@604 | 277 | for outgoing_recipients, part in all_responses: |
| paul@604 | 278 | if outgoing_recipients: |
| paul@604 | 279 | for outgoing_recipient in outgoing_recipients: |
| paul@604 | 280 | if not outgoing_parts.has_key(outgoing_recipient): |
| paul@604 | 281 | outgoing_parts[outgoing_recipient] = [] |
| paul@604 | 282 | outgoing_parts[outgoing_recipient].append(part) |
| paul@604 | 283 | else: |
| paul@604 | 284 | forwarded_parts.append(part) |
| paul@604 | 285 | |
| paul@604 | 286 | # Reply using any outgoing parts in a new message. |
| paul@604 | 287 | |
| paul@604 | 288 | if outgoing_parts: |
| paul@604 | 289 | |
| paul@604 | 290 | # Obtain free/busy details, if configured to do so. |
| paul@604 | 291 | |
| paul@604 | 292 | fb = self.can_provide_freebusy(handlers) and self.get_freebusy_part() |
| paul@604 | 293 | |
| paul@604 | 294 | for outgoing_recipient, parts in outgoing_parts.items(): |
| paul@604 | 295 | |
| paul@604 | 296 | # Bundle free/busy messages, if configured to do so. |
| paul@604 | 297 | |
| paul@604 | 298 | if fb: parts.append(fb) |
| paul@604 | 299 | message = self.messenger.make_outgoing_message(parts, [outgoing_recipient]) |
| paul@604 | 300 | |
| paul@607 | 301 | if self.debug: |
| paul@604 | 302 | print >>sys.stderr, "Outgoing parts for %s..." % outgoing_recipient |
| paul@604 | 303 | print message |
| paul@604 | 304 | else: |
| paul@604 | 305 | self.messenger.sendmail([outgoing_recipient], message.as_string()) |
| paul@604 | 306 | |
| paul@604 | 307 | # Forward messages to their recipients either wrapping the existing |
| paul@604 | 308 | # message, accompanying it or replacing it. |
| paul@604 | 309 | |
| paul@604 | 310 | if forwarded_parts: |
| paul@604 | 311 | |
| paul@604 | 312 | # Determine whether to wrap, accompany or replace the message. |
| paul@604 | 313 | |
| paul@604 | 314 | prefs = self.get_preferences() |
| paul@749 | 315 | incoming = prefs.get("incoming", config.INCOMING_DEFAULT) |
| paul@604 | 316 | |
| paul@604 | 317 | if incoming == "message-only": |
| paul@604 | 318 | messages = [msg] |
| paul@604 | 319 | else: |
| paul@604 | 320 | summary = self.messenger.make_summary_message(msg, forwarded_parts) |
| paul@604 | 321 | if incoming == "summary-then-message": |
| paul@604 | 322 | messages = [summary, msg] |
| paul@604 | 323 | elif incoming == "message-then-summary": |
| paul@604 | 324 | messages = [msg, summary] |
| paul@604 | 325 | elif incoming == "summary-only": |
| paul@604 | 326 | messages = [summary] |
| paul@604 | 327 | else: # incoming == "summary-wraps-message": |
| paul@604 | 328 | messages = [self.messenger.wrap_message(msg, forwarded_parts)] |
| paul@604 | 329 | |
| paul@604 | 330 | for message in messages: |
| paul@607 | 331 | if self.debug: |
| paul@604 | 332 | print >>sys.stderr, "Forwarded parts..." |
| paul@604 | 333 | print message |
| paul@607 | 334 | elif self.messenger.local_delivery(): |
| paul@666 | 335 | self.messenger.sendmail([get_address(self.user)], message.as_string()) |
| paul@604 | 336 | |
| paul@604 | 337 | # Unhandled messages are delivered as they are. |
| paul@604 | 338 | |
| paul@604 | 339 | if not handled: |
| paul@607 | 340 | if self.debug: |
| paul@604 | 341 | print >>sys.stderr, "Unhandled parts..." |
| paul@604 | 342 | print msg |
| paul@607 | 343 | elif self.messenger.local_delivery(): |
| paul@666 | 344 | self.messenger.sendmail([get_address(self.user)], msg.as_string()) |
| paul@604 | 345 | |
| paul@604 | 346 | def can_provide_freebusy(self, handlers): |
| paul@604 | 347 | |
| paul@604 | 348 | "Test for any free/busy information produced by 'handlers'." |
| paul@604 | 349 | |
| paul@604 | 350 | fbhandler = handlers.get("VFREEBUSY") |
| paul@604 | 351 | if fbhandler: |
| paul@604 | 352 | fbmethods = fbhandler.get_outgoing_methods() |
| paul@604 | 353 | return not "REPLY" in fbmethods and not "PUBLISH" in fbmethods |
| paul@604 | 354 | else: |
| paul@604 | 355 | return False |
| paul@604 | 356 | |
| paul@49 | 357 | # vim: tabstop=4 expandtab shiftwidth=4 |
