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annotate sat_pubsub/delegation.py @ 289:f08f8536cab8

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mod delegation: extensions management (XEP-0128)
author Goffi <goffi@goffi.org>
date Sat, 18 Apr 2015 00:15:01 +0200
parents 073161f6f143
children 61fb4817b77f
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1 #!/usr/bin/python
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2 #-*- coding: utf-8 -*-
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3 #
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4 """
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5 Copyright (c) 2015 Jérôme Poisson
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6
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7
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8 This program is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU Affero General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU Affero General Public License for more details.
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17
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18 You should have received a copy of the GNU Affero General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 ---
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22
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23 This module implements XEP-0355 (Namespace delegation) to use SàT Pubsub as PEP service
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24 """
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25
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26 from wokkel.subprotocols import XMPPHandler
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27 from wokkel import pubsub
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28 from wokkel import data_form
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29 from wokkel import disco, iwokkel
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30 from twisted.python import log
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31 from twisted.words.protocols.jabber import error
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32 from zope.interface import implements
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33
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34 DELEGATION_NS = 'urn:xmpp:delegation:1'
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35 FORWARDED_NS = 'urn:xmpp:forward:0'
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36 DELEGATION_ADV_XPATH = '/message/delegation[@xmlns="{}"]'.format(DELEGATION_NS)
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37
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38 DELEGATION_MAIN_SEP = "::"
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39 DELEGATION_BARE_SEP = ":bare:"
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40
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41 class InvalidStanza(Exception):
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42 pass
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43
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44 class DelegationsHandler(XMPPHandler):
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45 implements(iwokkel.IDisco)
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46
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47 def __init__(self):
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48 super(DelegationsHandler, self).__init__()
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49
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50 def connectionInitialized(self):
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51 self.xmlstream.addObserver(DELEGATION_ADV_XPATH, self.onAdvertise)
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52
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53 def onAdvertise(self, message):
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54 """Managage the <message/> advertising delegations"""
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55 delegation_elt = message.elements(DELEGATION_NS, 'delegation').next()
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56 delegated = {}
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57 for delegated_elt in delegation_elt.elements(DELEGATION_NS):
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58 try:
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59 if delegated_elt.name != 'delegated':
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60 raise InvalidStanza(u'unexpected element {}'.format(delegated_elt.name))
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61 try:
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62 namespace = delegated_elt['namespace']
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63 except KeyError:
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64 raise InvalidStanza(u'was expecting a "namespace" attribute in delegated element')
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65 delegated[namespace] = []
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66 for attribute_elt in delegated_elt.elements(DELEGATION_NS, 'attribute'):
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67 try:
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68 delegated[namespace].append(attribute_elt["name"])
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69 except KeyError:
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70 raise InvalidStanza(u'was expecting a "name" attribute in attribute element')
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71 except InvalidStanza as e:
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72 log.msg("Invalid stanza received ({})".format(e))
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73
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74 log.msg(u'delegations updated:\n{}'.format(
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75 u'\n'.join([u" - namespace {}{}".format(ns,
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76 u"" if not attributes else u" with filtering on {} attribute(s)".format(
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77 u", ".join(attributes))) for ns, attributes in delegated.items()])))
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78
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79 if not pubsub.NS_PUBSUB in delegated:
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80 log.msg(u"Didn't got pubsub delegation from server, can't act as a PEP service")
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81
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82 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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83 """Manage disco nesting
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84
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85 This method looks for DiscoHandler in sibling handlers and use it to
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86 collect main disco infos. It then filters by delegated namespace and return it.
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87 An identity is added for PEP if pubsub namespace is requested.
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88
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89 The same features/identities are returned for main and bare nodes
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90 """
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91 if not nodeIdentifier.startswith(DELEGATION_NS):
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92 return []
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93
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94 try:
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95 _, namespace = nodeIdentifier.split(DELEGATION_MAIN_SEP, 1)
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96 except ValueError:
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97 try:
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98 _, namespace = nodeIdentifier.split(DELEGATION_BARE_SEP, 1)
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99 except ValueError:
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100 log.msg("Unexpected disco node: {}".format(nodeIdentifier))
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101 raise error.StanzaError('not-acceptable')
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102
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103 if not namespace:
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104 log.msg("No namespace found in node {}".format(nodeIdentifier))
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105 return []
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106
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107 def gotInfos(infos):
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108 ns_features = []
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109 for info in infos:
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110 if isinstance(info, disco.DiscoFeature) and info.startswith(namespace):
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111 ns_features.append(info)
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112 elif (isinstance(info, data_form.Form) and info.formNamespace
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113 and info.formNamespace.startwith(namespace)):
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114 # extensions management (XEP-0128)
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115 ns_features.append(info)
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116
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117 if namespace == pubsub.NS_PUBSUB:
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118 ns_features.append(disco.DiscoIdentity('pubsub', 'pep'))
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119
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120 return ns_features
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121
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122 for handler in self.parent.handlers:
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123 if isinstance(handler, disco.DiscoHandler):
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124 break
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125
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126 if not isinstance(handler, disco.DiscoHandler):
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127 log.err("Can't find DiscoHandler")
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128 return []
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129
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130 d = handler.info(requestor, target, '')
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131 d.addCallback(gotInfos)
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132 return d
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133
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Goffi <goffi@goffi.org>
parents: 287
diff changeset
134 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
073161f6f143 namespace delegation: disco nesting management
Goffi <goffi@goffi.org>
parents: 287
diff changeset
135 return []