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annotate src/plugins/plugin_xep_0020.py @ 1934:2daf7b4c6756

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use of /usr/bin/env instead of /usr/bin/python in shebang
author Goffi <goffi@goffi.org>
date Sun, 17 Apr 2016 14:45:26 +0200
parents d17772b0fe22
children 1d3f73e065e1
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) 2009-2016 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.log import getLogger
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22 log = getLogger(__name__)
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23 from sat.core import exceptions
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24 from twisted.words.xish import domish
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25
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26 from zope.interface import implements
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27
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28 try:
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29 from twisted.words.protocols.xmlstream import XMPPHandler
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30 except ImportError:
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31 from wokkel.subprotocols import XMPPHandler
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32
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33 from wokkel import disco, iwokkel, data_form
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34
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35 NS_FEATURE_NEG = 'http://jabber.org/protocol/feature-neg'
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36
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37 PLUGIN_INFO = {
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38 "name": "XEP 0020 Plugin",
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39 "import_name": "XEP-0020",
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40 "type": "XEP",
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41 "protocols": ["XEP-0020"],
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42 "main": "XEP_0020",
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43 "handler": "yes",
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44 "description": _("""Implementation of Feature Negotiation""")
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45 }
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46
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47
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48 class XEP_0020(object):
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49
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50 def __init__(self, host):
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51 log.info(_("Plugin XEP_0020 initialization"))
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52
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53 def getHandler(self, profile):
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54 return XEP_0020_handler()
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55
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56 def getFeatureElt(self, elt):
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57 """Check element's children to find feature elements
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58
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59 @param elt(domish.Element): parent element of the feature element
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60 @return: feature elements
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61 @raise exceptions.NotFound: no feature element found
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62 """
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63 try:
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64 feature_elt = elt.elements(NS_FEATURE_NEG, 'feature').next()
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65 except StopIteration:
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66 raise exceptions.NotFound
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67 return feature_elt
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68
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69 def _getForm(self, elt, namespace):
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70 """Return the first child data form
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71
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72 @param elt(domish.Element): parent of the data form
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73 @param namespace (None, unicode): form namespace or None to ignore
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74 @return (None, data_form.Form): data form or None is nothing is found
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75 """
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76 if namespace is None:
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77 try:
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78 form_elt = elt.elements(data_form.NS_X_DATA).next()
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79 except StopIteration:
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80 return None
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81 else:
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82 return data_form.Form.fromElement(form_elt)
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83 else:
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84 return data_form.findForm(elt, namespace)
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85
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86 def getChoosedOptions(self, feature_elt, namespace):
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87 """Return choosed feature for feature element
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88
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89 @param feature_elt(domish.Element): feature domish element
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90 @param namespace (None, unicode): form namespace or None to ignore
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91 @return (dict): feature name as key, and choosed option as value
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92 @raise exceptions.NotFound: not data form is found
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93 """
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94 form = self._getForm(feature_elt, namespace)
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95 if form is None:
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96 raise exceptions.NotFound
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97 result = {}
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98 for field in form.fields:
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99 values = form.fields[field].values
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100 result[field] = values[0] if values else None
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101 if len(values) > 1:
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102 log.warning(_(u"More than one value choosed for {}, keeping the first one").format(field))
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103 return result
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104
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105 def negotiate(self, feature_elt, name, negotiable_values, namespace):
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106 """Negotiate the feature options
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107
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108 @param feature_elt(domish.Element): feature element
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109 @param name: the option name (i.e. field's var attribute) to negotiate
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110 @param negotiable_values(iterable): acceptable values for this negotiation
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111 first corresponding value will be returned
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112 @param namespace (None, unicode): form namespace or None to ignore
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113 @raise KeyError: name is not found in data form fields
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114 """
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115 form = self._getForm(feature_elt, namespace)
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116 options = [option.value for option in form.fields[name].options]
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117 for value in negotiable_values:
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118 if value in options:
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119 return value
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120 return None
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121
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122 def chooseOption(self, options, namespace):
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123 """Build a feature element with choosed options
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124
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125 @param options(dict): dict with feature as key and choosed option as value
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126 @param namespace (None, unicode): form namespace or None to ignore
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127 """
383
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128 feature_elt = domish.Element((NS_FEATURE_NEG, 'feature'))
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129 x_form = data_form.Form('submit', formNamespace=namespace)
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130 x_form.makeFields(options)
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131 feature_elt.addChild(x_form.toElement())
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132 return feature_elt
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133
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134 def proposeFeatures(self, options_dict, namespace):
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135 """Build a feature element with options to propose
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136
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137 @param options_dict(dict): dict with feature as key and iterable of acceptable options as value
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138 @param namespace(None, unicode): feature namespace
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139 """
383
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140 feature_elt = domish.Element((NS_FEATURE_NEG, 'feature'))
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141 x_form = data_form.Form('form', formNamespace=namespace)
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142 for field in options_dict:
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143 x_form.addField(data_form.Field('list-single', field,
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144 options=[data_form.Option(option) for option in options_dict[field]]))
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145 feature_elt.addChild(x_form.toElement())
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146 return feature_elt
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147
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148
383
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149 class XEP_0020_handler(XMPPHandler):
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150 implements(iwokkel.IDisco)
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151
383
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152 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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153 return [disco.DiscoFeature(NS_FEATURE_NEG)]
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154
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155 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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156 return []