Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0020.py @ 4294:a0ed5c976bf8 default tip @
component conferences, plugin XEP-0167, XEP-0298: add stream user metadata:
A/V conference now adds user metadata about the stream it is forwarding through XEP-0298.
This is parsed and added to metadata during confirmation on client side.
rel 448
author | Goffi <goffi@goffi.org> |
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date | Tue, 06 Aug 2024 23:43:11 +0200 |
parents | 0d7bb4df2343 |
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rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
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3 |
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4 # SAT plugin for managing xep-0020 |
3479 | 5 # Copyright (C) 2009-2021 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 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 |
3028 | 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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48 |
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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: |
3028 | 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: |
3028 | 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 _("More than one value choosed for {}, keeping the first one").format( |
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105 field |
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106 ) |
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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 |
3028 | 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 [] |