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annotate src/plugins/plugin_xep_0095.py @ 1055:abcac1ac27a7

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plugin otr: first draft
author Goffi <goffi@goffi.org>
date Sat, 07 Jun 2014 16:39:08 +0200
parents 301b342c697a
children 069ad98b360d
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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 # SAT plugin for managing xep-0095
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from twisted.words.xish import domish
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25 from twisted.words.protocols.jabber import client
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26 import uuid
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27
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28 from zope.interface import implements
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29
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30 try:
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31 from twisted.words.protocols.xmlstream import XMPPHandler
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32 except ImportError:
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33 from wokkel.subprotocols import XMPPHandler
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34
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35 from wokkel import disco, iwokkel
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36
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37 IQ_SET = '/iq[@type="set"]'
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38 NS_SI = 'http://jabber.org/protocol/si'
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39 SI_REQUEST = IQ_SET + '/si[@xmlns="' + NS_SI + '"]'
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40 SI_PROFILE_HEADER = "http://jabber.org/protocol/si/profile/"
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41
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42 PLUGIN_INFO = {
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43 "name": "XEP 0095 Plugin",
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44 "import_name": "XEP-0095",
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45 "type": "XEP",
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46 "protocols": ["XEP-0095"],
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47 "main": "XEP_0095",
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48 "handler": "yes",
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49 "description": _("""Implementation of Stream Initiation""")
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50 }
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51
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52
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53 class XEP_0095(object):
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54
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55 def __init__(self, host):
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56 log.info(_("Plugin XEP_0095 initialization"))
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57 self.host = host
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58 self.si_profiles = {} # key: SI profile, value: callback
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59
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60 def getHandler(self, profile):
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61 return XEP_0095_handler(self)
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62
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63 def registerSIProfile(self, si_profile, callback):
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64 """Add a callback for a SI Profile
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65 param si_profile: SI profile name (e.g. file-transfer)
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66 param callback: method to call when the profile name is asked"""
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67 self.si_profiles[si_profile] = callback
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68
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69 def streamInit(self, iq_el, profile):
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70 """This method is called on stream initiation (XEP-0095 #3.2)
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71 @param iq_el: IQ element
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72 @param profile: %(doc_profile)s"""
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73 log.info(_("XEP-0095 Stream initiation"))
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74 iq_el.handled = True
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75 si_el = iq_el.firstChildElement()
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76 si_id = si_el.getAttribute('id')
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77 si_mime_type = iq_el.getAttribute('mime-type', 'application/octet-stream')
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78 si_profile = si_el.getAttribute('profile')
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79 si_profile_key = si_profile[len(SI_PROFILE_HEADER):] if si_profile.startswith(SI_PROFILE_HEADER) else si_profile
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80 if si_profile_key in self.si_profiles:
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81 #We know this SI profile, we call the callback
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82 self.si_profiles[si_profile_key](iq_el['id'], iq_el['from'], si_id, si_mime_type, si_el, profile)
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83 else:
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84 #We don't know this profile, we send an error
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85 self.sendBadProfileError(iq_el['id'], iq_el['from'], profile)
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86
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87 def sendRejectedError(self, iq_id, to_jid, reason='Offer Declined', profile=C.PROF_KEY_NONE):
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88 """Helper method to send when the stream is rejected
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89 @param iq_id: IQ id
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90 @param to_jid: recipient
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91 @param reason: human readable reason (string)
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92 @param profile: %(doc_profile)s"""
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93 self.sendError(iq_id, to_jid, 403, 'cancel', {'text': reason}, profile=profile)
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94
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95 def sendBadProfileError(self, iq_id, to_jid, profile):
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96 """Helper method to send when we don't know the SI profile
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97 @param iq_id: IQ id
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98 @param to_jid: recipient
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99 @param profile: %(doc_profile)s"""
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100 self.sendError(iq_id, to_jid, 400, 'modify', profile=profile)
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101
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102 def sendBadRequestError(self, iq_id, to_jid, profile):
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103 """Helper method to send when we don't know the SI profile
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104 @param iq_id: IQ id
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105 @param to_jid: recipient
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106 @param profile: %(doc_profile)s"""
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107 self.sendError(iq_id, to_jid, 400, 'cancel', profile=profile)
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108
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109 def sendFailedError(self, iq_id, to_jid, profile):
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110 """Helper method to send when we transfer failed
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111 @param iq_id: IQ id
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112 @param to_jid: recipient
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113 @param profile: %(doc_profile)s"""
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114 self.sendError(iq_id, to_jid, 500, 'cancel', {'custom': 'failed'}, profile=profile) # as there is no lerror code for failed transfer, we use 500 (undefined-condition)
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115
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116 def sendError(self, iq_id, to_jid, err_code, err_type='cancel', data={}, profile=C.PROF_KEY_NONE):
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117 """Send IQ error as a result
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118 @param iq_id: IQ id
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119 @param to_jid: recipient
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120 @param err_code: error err_code (see XEP-0095 #4.2)
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121 @param err_type: one of cancel, modify
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122 @param data: error specific data (dictionary)
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123 @param profile: %(doc_profile)s
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124 """
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125 client_ = self.host.getClient(profile)
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126 result = domish.Element((None, 'iq'))
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127 result['type'] = 'result'
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128 result['id'] = iq_id
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129 result['to'] = to_jid
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130 error_el = result.addElement('error')
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131 error_el['err_code'] = str(err_code)
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132 error_el['type'] = err_type
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133 if err_code == 400 and err_type == 'cancel':
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134 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'bad-request'))
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135 error_el.addElement((NS_SI, 'no-valid-streams'))
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136 elif err_code == 400 and err_type == 'modify':
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137 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'bad-request'))
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138 error_el.addElement((NS_SI, 'bad-profile'))
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139 elif err_code == 403 and err_type == 'cancel':
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140 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'forbidden'))
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141 if 'text' in data:
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142 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'text'), content=data['text'])
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143 elif err_code == 500 and err_type == 'cancel':
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144 condition_el = error_el.addElement((NS_SI, 'undefined-condition'))
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145 if 'custom' in data and data['custom'] == 'failed':
385
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146 condition_el.addContent('Stream failed')
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147
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148 client_.xmlstream.send(result)
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149
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150 def acceptStream(self, iq_id, to_jid, feature_elt, misc_elts=[], profile=C.PROF_KEY_NONE):
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151 """Send the accept stream initiation answer
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152 @param iq_id: IQ id
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153 @param feature_elt: domish element 'feature' containing stream method to use
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154 @param misc_elts: list of domish element to add
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155 @param profile: %(doc_profile)s"""
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156 _client = self.host.getClient(profile)
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157 assert(_client)
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158 log.info(_("sending stream initiation accept answer"))
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159 result = domish.Element((None, 'iq'))
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160 result['type'] = 'result'
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161 result['id'] = iq_id
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162 result['to'] = to_jid
385
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163 si = result.addElement('si', NS_SI)
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164 si.addChild(feature_elt)
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165 for elt in misc_elts:
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166 si.addChild(elt)
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167 _client.xmlstream.send(result)
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168
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169 def proposeStream(self, to_jid, si_profile, feature_elt, misc_elts, mime_type='application/octet-stream', profile_key=C.PROF_KEY_NONE):
385
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170 """Propose a stream initiation
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171 @param to_jid: recipient (JID)
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172 @param si_profile: Stream initiation profile (XEP-0095)
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173 @param feature_elt: feature domish element, according to XEP-0020
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174 @param misc_elts: list of domish element to add for this profile
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175 @param mime_type: stream mime type
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176 @param profile: %(doc_profile)s
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177 @return: session id, offer"""
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178 current_jid, xmlstream = self.host.getJidNStream(profile_key)
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179 if not xmlstream:
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180 log.error(_('Asking for an non-existant or not connected profile'))
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181 return ""
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182
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183 offer = client.IQ(xmlstream, 'set')
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184 sid = str(uuid.uuid4())
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185 log.debug(_("Stream Session ID: %s") % offer["id"])
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186
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187 offer["from"] = current_jid.full()
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188 offer["to"] = to_jid.full()
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189 si = offer.addElement('si', NS_SI)
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190 si['id'] = sid
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191 si["mime-type"] = mime_type
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192 si["profile"] = si_profile
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193 for elt in misc_elts:
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194 si.addChild(elt)
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195 si.addChild(feature_elt)
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196
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197 offer.send()
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198 return sid, offer
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199
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200
385
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201 class XEP_0095_handler(XMPPHandler):
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202 implements(iwokkel.IDisco)
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203
385
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204 def __init__(self, plugin_parent):
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205 self.plugin_parent = plugin_parent
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206 self.host = plugin_parent.host
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207
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
208 def connectionInitialized(self):
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diff changeset
209 self.xmlstream.addObserver(SI_REQUEST, self.plugin_parent.streamInit, profile=self.parent.profile)
385
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210
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
211 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
212 return [disco.DiscoFeature(NS_SI)] + [disco.DiscoFeature("http://jabber.org/protocol/si/profile/%s" % profile_name) for profile_name in self.plugin_parent.si_profiles]
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213
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
214 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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diff changeset
215 return []