Mercurial > libervia-backend

annotate src/plugins/plugin_xep_0020.py @ 2432:c6d859df4b27

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plugin XEP-0060: use new findServiceEntity to get default pubsub service
author Goffi <goffi@goffi.org>
date Wed, 15 Nov 2017 08:55:47 +0100
parents 8b37a62336c3
children 0046283a285d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1934
2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for managing xep-0020
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5 # Copyright (C) 2009-2017 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 sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from sat.core import exceptions
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25 from twisted.words.xish import domish
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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, data_form
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35
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36 NS_FEATURE_NEG = 'http://jabber.org/protocol/feature-neg'
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37
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38 PLUGIN_INFO = {
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39 C.PI_NAME: "XEP 0020 Plugin",
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40 C.PI_IMPORT_NAME: "XEP-0020",
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41 C.PI_TYPE: "XEP",
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42 C.PI_PROTOCOLS: ["XEP-0020"],
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43 C.PI_MAIN: "XEP_0020",
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44 C.PI_HANDLER: "yes",
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45 C.PI_DESCRIPTION: _("""Implementation of Feature Negotiation""")
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46 }
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48
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49 class XEP_0020(object):
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50
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51 def __init__(self, host):
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52 log.info(_("Plugin XEP_0020 initialization"))
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53
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54 def getHandler(self, client):
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55 return XEP_0020_handler()
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56
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57 def getFeatureElt(self, elt):
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58 """Check element's children to find feature elements
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59
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60 @param elt(domish.Element): parent element of the feature element
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61 @return: feature elements
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62 @raise exceptions.NotFound: no feature element found
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63 """
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64 try:
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65 feature_elt = elt.elements(NS_FEATURE_NEG, 'feature').next()
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66 except StopIteration:
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67 raise exceptions.NotFound
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68 return feature_elt
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69
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70 def _getForm(self, elt, namespace):
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71 """Return the first child data form
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72
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73 @param elt(domish.Element): parent of the data form
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74 @param namespace (None, unicode): form namespace or None to ignore
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75 @return (None, data_form.Form): data form or None is nothing is found
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76 """
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77 if namespace is None:
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78 try:
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79 form_elt = elt.elements(data_form.NS_X_DATA).next()
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80 except StopIteration:
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81 return None
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82 else:
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83 return data_form.Form.fromElement(form_elt)
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84 else:
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85 return data_form.findForm(elt, namespace)
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86
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87 def getChoosedOptions(self, feature_elt, namespace):
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88 """Return choosed feature for feature element
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90 @param feature_elt(domish.Element): feature domish element
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91 @param namespace (None, unicode): form namespace or None to ignore
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92 @return (dict): feature name as key, and choosed option as value
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93 @raise exceptions.NotFound: not data form is found
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94 """
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95 form = self._getForm(feature_elt, namespace)
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96 if form is None:
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97 raise exceptions.NotFound
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98 result = {}
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99 for field in form.fields:
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100 values = form.fields[field].values
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101 result[field] = values[0] if values else None
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102 if len(values) > 1:
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103 log.warning(_(u"More than one value choosed for {}, keeping the first one").format(field))
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104 return result
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105
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106 def negotiate(self, feature_elt, name, negotiable_values, namespace):
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107 """Negotiate the feature options
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108
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109 @param feature_elt(domish.Element): feature element
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110 @param name: the option name (i.e. field's var attribute) to negotiate
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111 @param negotiable_values(iterable): acceptable values for this negotiation
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112 first corresponding value will be returned
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113 @param namespace (None, unicode): form namespace or None to ignore
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114 @raise KeyError: name is not found in data form fields
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115 """
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116 form = self._getForm(feature_elt, namespace)
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117 options = [option.value for option in form.fields[name].options]
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118 for value in negotiable_values:
383
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119 if value in options:
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120 return value
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121 return None
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122
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123 def chooseOption(self, options, namespace):
383
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124 """Build a feature element with choosed options
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125
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126 @param options(dict): dict with feature as key and choosed option as value
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127 @param namespace (None, unicode): form namespace or None to ignore
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128 """
383
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129 feature_elt = domish.Element((NS_FEATURE_NEG, 'feature'))
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130 x_form = data_form.Form('submit', formNamespace=namespace)
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131 x_form.makeFields(options)
383
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132 feature_elt.addChild(x_form.toElement())
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133 return feature_elt
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134
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135 def proposeFeatures(self, options_dict, namespace):
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136 """Build a feature element with options to propose
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137
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138 @param options_dict(dict): dict with feature as key and iterable of acceptable options as value
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139 @param namespace(None, unicode): feature namespace
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parents: 1409
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140 """
383
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141 feature_elt = domish.Element((NS_FEATURE_NEG, 'feature'))
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142 x_form = data_form.Form('form', formNamespace=namespace)
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143 for field in options_dict:
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144 x_form.addField(data_form.Field('list-single', field,
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145 options=[data_form.Option(option) for option in options_dict[field]]))
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146 feature_elt.addChild(x_form.toElement())
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147 return feature_elt
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148
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149
383
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150 class XEP_0020_handler(XMPPHandler):
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151 implements(iwokkel.IDisco)
587
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152
383
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153 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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154 return [disco.DiscoFeature(NS_FEATURE_NEG)]
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155
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156 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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157 return []