Mercurial > libervia-backend

annotate sat/plugins/plugin_xep_0020.py @ 3167:d0fb79f97466

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quick frontends (app): added an "ignore_missing" argument to RemoveListener: normally an error is logged when removeListener is call on a inexisting listener, but sometimes listeners are added only in specific scenarios, and it may be handy to try to delete them without having to explictly check that they have been used.
author Goffi <goffi@goffi.org>
date Wed, 12 Feb 2020 19:44:05 +0100
parents 559a625a236b
children be6d91572633
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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4 # SAT plugin for managing xep-0020
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5 # Copyright (C) 2009-2020 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 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
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24 log = getLogger(__name__)
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25 from sat.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 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 = 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 _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 = 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 getChoosedOptions(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._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(
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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._getForm(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 chooseOption(self, options, namespace):
383
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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 proposeFeatures(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 []