1 #!/usr/bin/env python 2 3 """ 4 The handler invocation mechanism. 5 6 Copyright (C) 2014, 2015 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 from imiptools.config import IMIP_COUNTER_AS_REQUEST 23 from imiptools.data import Object, parse_object, get_value 24 25 try: 26 from cStringIO import StringIO 27 except ImportError: 28 from StringIO import StringIO 29 30 def handle_itip_part(part, handlers): 31 32 """ 33 Handle the given iTIP 'part' using the given 'handlers' dictionary. 34 35 Return a list of responses, each response being a tuple of the form 36 (outgoing-recipients, message-part). 37 """ 38 39 method = part.get_param("method") 40 method = method and method.upper() 41 42 # Decode the data and parse it. 43 44 f = StringIO(part.get_payload(decode=True)) 45 46 itip = parse_object(f, part.get_content_charset(), "VCALENDAR") 47 48 # Ignore the part if not a calendar object. 49 50 if not itip: 51 return 52 53 # Require consistency between declared and employed methods. 54 55 itip_method = get_value(itip, "METHOD") 56 57 if itip_method == method or \ 58 IMIP_COUNTER_AS_REQUEST and itip_method == "COUNTER" and method == "REQUEST": 59 60 # Assert the object's method as the definitive one. 61 62 method = itip_method 63 64 # Look for different kinds of sections. 65 66 all_results = [] 67 68 for name, items in itip.items(): 69 70 # Get a handler for the given section. 71 72 handler = handlers.get(name) 73 if not handler: 74 continue 75 76 for item in items: 77 78 # Dispatch to a handler and obtain any response. 79 80 handler.set_object(Object({name : item})) 81 handler.set_identity(method) 82 83 if handler.is_usable(method): 84 85 # Perform the method in a critical section. 86 87 handler.acquire_lock() 88 try: 89 methods[method](handler)() 90 finally: 91 handler.release_lock() 92 93 # Handler registry. 94 95 methods = { 96 "ADD" : lambda handler: handler.add, 97 "CANCEL" : lambda handler: handler.cancel, 98 "COUNTER" : lambda handler: handler.counter, 99 "DECLINECOUNTER" : lambda handler: handler.declinecounter, 100 "PUBLISH" : lambda handler: handler.publish, 101 "REFRESH" : lambda handler: handler.refresh, 102 "REPLY" : lambda handler: handler.reply, 103 "REQUEST" : lambda handler: handler.request, 104 } 105 106 # vim: tabstop=4 expandtab shiftwidth=4