Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0020.py @ 4146:60d107f2178a

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frontends (tools/webrtc): fix `SINKS_APP` condition check.
author Goffi <goffi@goffi.org>
date Fri, 03 Nov 2023 15:32:17 +0100
parents 4b842c1fb686
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for managing xep-0020
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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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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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 libervia.backend.core.i18n import _
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21 from libervia.backend.core.constants import Const as C
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22 from libervia.backend.core.log import getLogger
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23
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24 log = getLogger(__name__)
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25 from libervia.backend.core import exceptions
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26 from twisted.words.xish import domish
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27
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28 from zope.interface import implementer
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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, data_form
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36
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37 NS_FEATURE_NEG = "http://jabber.org/protocol/feature-neg"
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38
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39 PLUGIN_INFO = {
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40 C.PI_NAME: "XEP 0020 Plugin",
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41 C.PI_IMPORT_NAME: "XEP-0020",
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42 C.PI_TYPE: "XEP",
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43 C.PI_PROTOCOLS: ["XEP-0020"],
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44 C.PI_MAIN: "XEP_0020",
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45 C.PI_HANDLER: "yes",
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46 C.PI_DESCRIPTION: _("""Implementation of Feature Negotiation"""),
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47 }
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49
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50 class XEP_0020(object):
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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 get_handler(self, client):
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55 return XEP_0020_handler()
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56
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57 def get_feature_elt(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 = next(elt.elements(NS_FEATURE_NEG, "feature"))
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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 _get_form(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 = next(elt.elements(data_form.NS_X_DATA))
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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 get_choosed_options(self, feature_elt, namespace):
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88 """Return choosed feature for feature element
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89
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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._get_form(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(
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104 _(
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105 "More than one value choosed for {}, keeping the first one"
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106 ).format(field)
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107 )
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108 return result
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109
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110 def negotiate(self, feature_elt, name, negotiable_values, namespace):
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111 """Negotiate the feature options
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112
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113 @param feature_elt(domish.Element): feature element
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114 @param name: the option name (i.e. field's var attribute) to negotiate
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115 @param negotiable_values(iterable): acceptable values for this negotiation
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116 first corresponding value will be returned
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117 @param namespace (None, unicode): form namespace or None to ignore
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118 @raise KeyError: name is not found in data form fields
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119 """
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120 form = self._get_form(feature_elt, namespace)
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121 options = [option.value for option in form.fields[name].options]
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122 for value in negotiable_values:
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123 if value in options:
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124 return value
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125 return None
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126
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127 def choose_option(self, options, namespace):
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128 """Build a feature element with choosed options
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129
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130 @param options(dict): dict with feature as key and choosed option as value
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131 @param namespace (None, unicode): form namespace or None to ignore
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132 """
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133 feature_elt = domish.Element((NS_FEATURE_NEG, "feature"))
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134 x_form = data_form.Form("submit", formNamespace=namespace)
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135 x_form.makeFields(options)
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136 feature_elt.addChild(x_form.toElement())
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137 return feature_elt
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138
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139 def propose_features(self, options_dict, namespace):
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140 """Build a feature element with options to propose
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141
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142 @param options_dict(dict): dict with feature as key and iterable of acceptable options as value
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143 @param namespace(None, unicode): feature namespace
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144 """
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145 feature_elt = domish.Element((NS_FEATURE_NEG, "feature"))
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146 x_form = data_form.Form("form", formNamespace=namespace)
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147 for field in options_dict:
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148 x_form.addField(
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149 data_form.Field(
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150 "list-single",
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151 field,
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152 options=[data_form.Option(option) for option in options_dict[field]],
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153 )
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154 )
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155 feature_elt.addChild(x_form.toElement())
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156 return feature_elt
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157
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158
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159 @implementer(iwokkel.IDisco)
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160 class XEP_0020_handler(XMPPHandler):
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161
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162 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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163 return [disco.DiscoFeature(NS_FEATURE_NEG)]
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164
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165 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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166 return []