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annotate src/plugins/plugin_xep_0095.py @ 941:c6d8fc63b1db

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core, plugins: host.getClient now raise an exception instead of returning None when no profile is found, plugins have been adapted consequently and a bit cleaned
author Goffi <goffi@goffi.org>
date Fri, 28 Mar 2014 18:07:02 +0100
parents 1a759096ccbd
children 301b342c697a
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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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16
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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 logging import debug, info, error
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23 from twisted.words.xish import domish
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24 from twisted.words.protocols.jabber import client
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25 import uuid
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26
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27 from zope.interface import implements
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28
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29 try:
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30 from twisted.words.protocols.xmlstream import XMPPHandler
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31 except ImportError:
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32 from wokkel.subprotocols import XMPPHandler
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33
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34 from wokkel import disco, iwokkel
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35
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36 IQ_SET = '/iq[@type="set"]'
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37 NS_SI = 'http://jabber.org/protocol/si'
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38 SI_REQUEST = IQ_SET + '/si[@xmlns="' + NS_SI + '"]'
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39 SI_PROFILE_HEADER = "http://jabber.org/protocol/si/profile/"
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40
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41 PLUGIN_INFO = {
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42 "name": "XEP 0095 Plugin",
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43 "import_name": "XEP-0095",
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44 "type": "XEP",
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45 "protocols": ["XEP-0095"],
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46 "main": "XEP_0095",
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47 "handler": "yes",
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48 "description": _("""Implementation of Stream Initiation""")
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49 }
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51
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52 class XEP_0095(object):
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53
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54 def __init__(self, host):
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55 info(_("Plugin XEP_0095 initialization"))
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56 self.host = host
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57 self.si_profiles = {} # key: SI profile, value: callback
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58
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59 def getHandler(self, profile):
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60 return XEP_0095_handler(self)
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61
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62 def registerSIProfile(self, si_profile, callback):
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63 """Add a callback for a SI Profile
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64 param si_profile: SI profile name (e.g. file-transfer)
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65 param callback: method to call when the profile name is asked"""
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66 self.si_profiles[si_profile] = callback
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67
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68 def streamInit(self, iq_el, profile):
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69 """This method is called on stream initiation (XEP-0095 #3.2)
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70 @param iq_el: IQ element
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71 @param profile: %(doc_profile)s"""
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72 info(_("XEP-0095 Stream initiation"))
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73 iq_el.handled = True
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74 si_el = iq_el.firstChildElement()
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75 si_id = si_el.getAttribute('id')
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76 si_mime_type = iq_el.getAttribute('mime-type', 'application/octet-stream')
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77 si_profile = si_el.getAttribute('profile')
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78 si_profile_key = si_profile[len(SI_PROFILE_HEADER):] if si_profile.startswith(SI_PROFILE_HEADER) else si_profile
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79 if si_profile_key in self.si_profiles:
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80 #We know this SI profile, we call the callback
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81 self.si_profiles[si_profile_key](iq_el['id'], iq_el['from'], si_id, si_mime_type, si_el, profile)
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82 else:
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83 #We don't know this profile, we send an error
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84 self.sendBadProfileError(iq_el['id'], iq_el['from'], profile)
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86 def sendRejectedError(self, iq_id, to_jid, reason='Offer Declined', profile=C.PROF_KEY_NONE):
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87 """Helper method to send when the stream is rejected
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88 @param iq_id: IQ id
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89 @param to_jid: recipient
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90 @param reason: human readable reason (string)
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91 @param profile: %(doc_profile)s"""
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92 self.sendError(iq_id, to_jid, 403, 'cancel', {'text': reason}, profile=profile)
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93
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94 def sendBadProfileError(self, iq_id, to_jid, profile):
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95 """Helper method to send when we don't know the SI profile
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96 @param iq_id: IQ id
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97 @param to_jid: recipient
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98 @param profile: %(doc_profile)s"""
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99 self.sendError(iq_id, to_jid, 400, 'modify', profile=profile)
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100
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101 def sendBadRequestError(self, iq_id, to_jid, profile):
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102 """Helper method to send when we don't know the SI profile
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103 @param iq_id: IQ id
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104 @param to_jid: recipient
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105 @param profile: %(doc_profile)s"""
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106 self.sendError(iq_id, to_jid, 400, 'cancel', profile=profile)
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107
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108 def sendFailedError(self, iq_id, to_jid, profile):
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109 """Helper method to send when we transfer failed
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110 @param iq_id: IQ id
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111 @param to_jid: recipient
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112 @param profile: %(doc_profile)s"""
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113 self.sendError(iq_id, to_jid, 500, 'cancel', {'custom': 'failed'}, profile=profile) # as there is no error code for failed transfer, we use 500 (undefined-condition)
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114
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115 def sendError(self, iq_id, to_jid, err_code, err_type='cancel', data={}, profile=C.PROF_KEY_NONE):
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116 """Send IQ error as a result
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117 @param iq_id: IQ id
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118 @param to_jid: recipient
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119 @param err_code: error err_code (see XEP-0095 #4.2)
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120 @param err_type: one of cancel, modify
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121 @param data: error specific data (dictionary)
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122 @param profile: %(doc_profile)s
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123 """
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124 client_ = self.host.getClient(profile)
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125 result = domish.Element((None, 'iq'))
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126 result['type'] = 'result'
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127 result['id'] = iq_id
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128 result['to'] = to_jid
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129 error_el = result.addElement('error')
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130 error_el['err_code'] = str(err_code)
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131 error_el['type'] = err_type
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132 if err_code == 400 and err_type == 'cancel':
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133 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'bad-request'))
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134 error_el.addElement((NS_SI, 'no-valid-streams'))
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135 elif err_code == 400 and err_type == 'modify':
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136 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'bad-request'))
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137 error_el.addElement((NS_SI, 'bad-profile'))
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138 elif err_code == 403 and err_type == 'cancel':
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139 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'forbidden'))
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140 if 'text' in data:
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141 error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'text'), content=data['text'])
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142 elif err_code == 500 and err_type == 'cancel':
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143 condition_el = error_el.addElement((NS_SI, 'undefined-condition'))
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144 if 'custom' in data and data['custom'] == 'failed':
385
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145 condition_el.addContent('Stream failed')
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146
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147 client_.xmlstream.send(result)
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148
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149 def acceptStream(self, iq_id, to_jid, feature_elt, misc_elts=[], profile=C.PROF_KEY_NONE):
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150 """Send the accept stream initiation answer
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151 @param iq_id: IQ id
385
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152 @param feature_elt: domish element 'feature' containing stream method to use
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153 @param misc_elts: list of domish element to add
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154 @param profile: %(doc_profile)s"""
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155 _client = self.host.getClient(profile)
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156 assert(_client)
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157 info(_("sending stream initiation accept answer"))
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158 result = domish.Element((None, 'iq'))
385
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159 result['type'] = 'result'
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160 result['id'] = iq_id
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161 result['to'] = to_jid
385
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162 si = result.addElement('si', NS_SI)
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163 si.addChild(feature_elt)
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164 for elt in misc_elts:
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165 si.addChild(elt)
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166 _client.xmlstream.send(result)
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167
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168 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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169 """Propose a stream initiation
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170 @param to_jid: recipient (JID)
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171 @param si_profile: Stream initiation profile (XEP-0095)
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172 @param feature_elt: feature domish element, according to XEP-0020
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173 @param misc_elts: list of domish element to add for this profile
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174 @param mime_type: stream mime type
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175 @param profile: %(doc_profile)s
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176 @return: session id, offer"""
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177 current_jid, xmlstream = self.host.getJidNStream(profile_key)
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178 if not xmlstream:
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179 error(_('Asking for an non-existant or not connected profile'))
385
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180 return ""
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181
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182 offer = client.IQ(xmlstream, 'set')
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183 sid = str(uuid.uuid4())
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184 debug(_("Stream Session ID: %s") % offer["id"])
385
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185
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186 offer["from"] = current_jid.full()
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187 offer["to"] = to_jid.full()
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diff changeset
188 si = offer.addElement('si', NS_SI)
385
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189 si['id'] = sid
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190 si["mime-type"] = mime_type
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191 si["profile"] = si_profile
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192 for elt in misc_elts:
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193 si.addChild(elt)
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194 si.addChild(feature_elt)
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195
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196 offer.send()
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197 return sid, offer
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198
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199
385
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200 class XEP_0095_handler(XMPPHandler):
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201 implements(iwokkel.IDisco)
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202
385
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203 def __init__(self, plugin_parent):
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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204 self.plugin_parent = plugin_parent
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205 self.host = plugin_parent.host
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
206
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
Goffi <goffi@goffi.org>
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diff changeset
207 def connectionInitialized(self):
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diff changeset
208 self.xmlstream.addObserver(SI_REQUEST, self.plugin_parent.streamInit, profile=self.parent.profile)
385
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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209
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
210 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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parents:
diff changeset
211 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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diff changeset
212
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
213 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
41fdaeb005bc plugins: Stream initiation (xep-0095) implementation
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diff changeset
214 return []