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annotate sat_pubsub/delegation.py @ 287:61f92273fb69

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implementation of XEP-0355 (Namespace Delegation) to use SàT Pubsub as PEP service, first draft
author Goffi <goffi@goffi.org>
date Thu, 16 Apr 2015 21:06:19 +0200
parents sat_pubsub/privilege.py@2f87fa282dfd
children 073161f6f143
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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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23 This module implements XEP-0355 (Namespace delegation) to use SàT Pubsub as PEP service
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24 """
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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 twisted.python import log
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30 DELEGATION_NS = 'urn:xmpp:delegation:1'
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31 FORWARDED_NS = 'urn:xmpp:forward:0'
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32 DELEGATION_ADV_XPATH = '/message/delegation[@xmlns="{}"]'.format(DELEGATION_NS)
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34 class InvalidStanza(Exception):
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35 pass
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36
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37 class DelegationsHandler(XMPPHandler):
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39 def __init__(self):
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40 super(DelegationsHandler, self).__init__()
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42 def connectionInitialized(self):
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43 self.xmlstream.addObserver(DELEGATION_ADV_XPATH, self.onAdvertise)
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45 def onAdvertise(self, message):
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46 """Managage the <message/> advertising delegations"""
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47 delegation_elt = message.elements(DELEGATION_NS, 'delegation').next()
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48 delegated = {}
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49 for delegated_elt in delegation_elt.elements(DELEGATION_NS):
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50 try:
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51 if delegated_elt.name != 'delegated':
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52 raise InvalidStanza(u'unexpected element {}'.format(delegated_elt.name))
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53 try:
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54 namespace = delegated_elt['namespace']
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55 except KeyError:
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56 raise InvalidStanza(u'was expecting a "namespace" attribute in delegated element')
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57 delegated[namespace] = []
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58 for attribute_elt in delegated_elt.elements(DELEGATION_NS, 'attribute'):
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59 try:
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60 delegated[namespace].append(attribute_elt["name"])
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61 except KeyError:
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62 raise InvalidStanza(u'was expecting a "name" attribute in attribute element')
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63 except InvalidStanza as e:
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64 log.msg("Invalid stanza received ({})".format(e))
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66 log.msg(u'delegations updated:\n{}'.format(
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67 u'\n'.join([u" - namespace {}{}".format(ns,
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68 u"" if not attributes else u" with filtering on {} attribute(s)".format(
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69 u", ".join(attributes))) for ns, attributes in delegated.items()])))
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71 if not pubsub.NS_PUBSUB in delegated:
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72 log.msg(u"Didn't got pubsub delegation from server, can't act as a PEP service")
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73