1 | # -*- test-case-name: wokkel.test.test_disco -*- |
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2 | # |
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3 | # Copyright (c) Ralph Meijer. |
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4 | # See LICENSE for details. |
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5 | |
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6 | """ |
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7 | XMPP Service Discovery. |
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8 | |
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9 | The XMPP service discovery protocol is documented in |
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10 | U{XEP-0030<http://xmpp.org/extensions/xep-0030.html>}. |
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11 | """ |
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12 | |
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13 | from twisted.internet import defer |
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14 | from twisted.words.protocols.jabber import error, jid |
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15 | from twisted.words.xish import domish |
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16 | |
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17 | from wokkel import data_form, generic |
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18 | from wokkel.iwokkel import IDisco |
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19 | from wokkel.subprotocols import IQHandlerMixin, XMPPHandler |
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20 | |
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21 | NS_DISCO = 'http://jabber.org/protocol/disco' |
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22 | NS_DISCO_INFO = NS_DISCO + '#info' |
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23 | NS_DISCO_ITEMS = NS_DISCO + '#items' |
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24 | |
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25 | IQ_GET = '/iq[@type="get"]' |
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26 | DISCO_INFO = IQ_GET + '/query[@xmlns="' + NS_DISCO_INFO + '"]' |
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27 | DISCO_ITEMS = IQ_GET + '/query[@xmlns="' + NS_DISCO_ITEMS + '"]' |
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28 | |
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29 | class DiscoFeature(unicode): |
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30 | """ |
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31 | XMPP service discovery feature. |
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32 | |
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33 | This extends C{unicode} to convert to and from L{domish.Element}, but |
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34 | further behaves identically. |
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35 | """ |
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36 | |
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37 | def toElement(self): |
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38 | """ |
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39 | Render to a DOM representation. |
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40 | |
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41 | @rtype: L{domish.Element}. |
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42 | """ |
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43 | element = domish.Element((NS_DISCO_INFO, 'feature')) |
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44 | element['var'] = unicode(self) |
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45 | return element |
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46 | |
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47 | |
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48 | @staticmethod |
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49 | def fromElement(element): |
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50 | """ |
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51 | Parse a DOM representation into a L{DiscoFeature} instance. |
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52 | |
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53 | @param element: Element that represents the disco feature. |
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54 | @type element: L{domish.Element}. |
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55 | @rtype L{DiscoFeature}. |
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56 | """ |
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57 | featureURI = element.getAttribute('var', u'') |
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58 | feature = DiscoFeature(featureURI) |
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59 | return feature |
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60 | |
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61 | |
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62 | |
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63 | class DiscoIdentity(object): |
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64 | """ |
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65 | XMPP service discovery identity. |
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66 | |
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67 | @ivar category: The identity category. |
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68 | @type category: C{unicode} |
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69 | @ivar type: The identity type. |
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70 | @type type: C{unicode} |
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71 | @ivar name: The optional natural language name for this entity. |
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72 | @type name: C{unicode} |
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73 | """ |
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74 | |
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75 | def __init__(self, category, idType, name=None): |
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76 | self.category = category |
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77 | self.type = idType |
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78 | self.name = name |
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79 | |
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80 | |
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81 | def toElement(self): |
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82 | """ |
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83 | Generate a DOM representation. |
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84 | |
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85 | @rtype: L{domish.Element}. |
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86 | """ |
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87 | element = domish.Element((NS_DISCO_INFO, 'identity')) |
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88 | if self.category: |
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89 | element['category'] = self.category |
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90 | if self.type: |
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91 | element['type'] = self.type |
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92 | if self.name: |
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93 | element['name'] = self.name |
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94 | return element |
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95 | |
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96 | |
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97 | @staticmethod |
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98 | def fromElement(element): |
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99 | """ |
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100 | Parse a DOM representation into a L{DiscoIdentity} instance. |
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101 | |
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102 | @param element: Element that represents the disco identity. |
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103 | @type element: L{domish.Element}. |
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104 | @rtype L{DiscoIdentity}. |
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105 | """ |
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106 | category = element.getAttribute('category') |
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107 | idType = element.getAttribute('type') |
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108 | name = element.getAttribute('name') |
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109 | feature = DiscoIdentity(category, idType, name) |
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110 | return feature |
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111 | |
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112 | |
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113 | |
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114 | class DiscoInfo(object): |
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115 | """ |
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116 | XMPP service discovery info. |
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117 | |
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118 | @ivar nodeIdentifier: The optional node this info applies to. |
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119 | @type nodeIdentifier: C{unicode} |
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120 | @ivar features: Features as L{DiscoFeature}. |
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121 | @type features: C{set} |
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122 | @ivar identities: Identities as a mapping from (category, type) to name, |
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123 | all C{unicode}. |
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124 | @type identities: C{dict} |
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125 | @ivar extensions: Service discovery extensions as a mapping from the |
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126 | extension form's C{FORM_TYPE} (C{unicode}) to |
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127 | L{data_form.Form}. Forms with no C{FORM_TYPE} field |
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128 | are mapped as C{None}. Note that multiple forms |
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129 | with the same C{FORM_TYPE} have the last in sequence |
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130 | prevail. |
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131 | @type extensions: C{dict} |
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132 | @ivar _items: Sequence of added items. |
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133 | @type _items: C{list} |
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134 | """ |
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135 | |
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136 | def __init__(self): |
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137 | self.nodeIdentifier = '' |
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138 | self.features = set() |
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139 | self.identities = {} |
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140 | self.extensions = {} |
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141 | self._items = [] |
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142 | |
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143 | |
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144 | def __iter__(self): |
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145 | """ |
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146 | Iterator over sequence of items in the order added. |
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147 | """ |
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148 | return iter(self._items) |
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149 | |
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150 | |
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151 | def append(self, item): |
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152 | """ |
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153 | Add a piece of service discovery info. |
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154 | |
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155 | @param item: A feature, identity or extension form. |
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156 | @type item: L{DiscoFeature}, L{DiscoIdentity} or L{data_form.Form} |
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157 | """ |
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158 | self._items.append(item) |
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159 | |
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160 | if isinstance(item, DiscoFeature): |
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161 | self.features.add(item) |
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162 | elif isinstance(item, DiscoIdentity): |
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163 | self.identities[(item.category, item.type)] = item.name |
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164 | elif isinstance(item, data_form.Form): |
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165 | self.extensions[item.formNamespace] = item |
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166 | |
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167 | |
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168 | def toElement(self): |
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169 | """ |
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170 | Generate a DOM representation. |
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171 | |
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172 | This takes the items added with C{append} to create a DOM |
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173 | representation of service discovery information. |
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174 | |
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175 | @rtype: L{domish.Element}. |
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176 | """ |
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177 | element = domish.Element((NS_DISCO_INFO, 'query')) |
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178 | |
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179 | if self.nodeIdentifier: |
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180 | element['node'] = self.nodeIdentifier |
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181 | |
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182 | for item in self: |
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183 | element.addChild(item.toElement()) |
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184 | |
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185 | return element |
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186 | |
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187 | |
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188 | @staticmethod |
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189 | def fromElement(element): |
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190 | """ |
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191 | Parse a DOM representation into a L{DiscoInfo} instance. |
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192 | |
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193 | @param element: Element that represents the disco info. |
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194 | @type element: L{domish.Element}. |
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195 | @rtype L{DiscoInfo}. |
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196 | """ |
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197 | |
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198 | info = DiscoInfo() |
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199 | |
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200 | info.nodeIdentifier = element.getAttribute('node', '') |
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201 | |
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202 | for child in element.elements(): |
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203 | item = None |
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204 | |
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205 | if (child.uri, child.name) == (NS_DISCO_INFO, 'feature'): |
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206 | item = DiscoFeature.fromElement(child) |
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207 | elif (child.uri, child.name) == (NS_DISCO_INFO, 'identity'): |
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208 | item = DiscoIdentity.fromElement(child) |
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209 | elif (child.uri, child.name) == (data_form.NS_X_DATA, 'x'): |
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210 | item = data_form.Form.fromElement(child) |
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211 | |
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212 | if item is not None: |
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213 | info.append(item) |
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214 | |
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215 | return info |
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216 | |
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217 | |
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218 | |
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219 | class DiscoItem(object): |
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220 | """ |
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221 | XMPP service discovery item. |
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222 | |
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223 | @ivar entity: The entity holding the item. |
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224 | @type entity: L{jid.JID} |
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225 | @ivar nodeIdentifier: The optional node identifier for the item. |
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226 | @type nodeIdentifier: C{unicode} |
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227 | @ivar name: The optional natural language name for this entity. |
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228 | @type name: C{unicode} |
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229 | """ |
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230 | |
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231 | def __init__(self, entity, nodeIdentifier='', name=None): |
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232 | self.entity = entity |
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233 | self.nodeIdentifier = nodeIdentifier |
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234 | self.name = name |
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235 | |
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236 | |
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237 | def toElement(self): |
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238 | """ |
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239 | Generate a DOM representation. |
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240 | |
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241 | @rtype: L{domish.Element}. |
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242 | """ |
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243 | element = domish.Element((NS_DISCO_ITEMS, 'item')) |
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244 | if self.entity: |
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245 | element['jid'] = self.entity.full() |
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246 | if self.nodeIdentifier: |
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247 | element['node'] = self.nodeIdentifier |
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248 | if self.name: |
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249 | element['name'] = self.name |
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250 | return element |
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251 | |
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252 | |
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253 | @staticmethod |
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254 | def fromElement(element): |
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255 | """ |
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256 | Parse a DOM representation into a L{DiscoItem} instance. |
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257 | |
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258 | @param element: Element that represents the disco iitem. |
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259 | @type element: L{domish.Element}. |
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260 | @rtype L{DiscoItem}. |
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261 | """ |
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262 | try: |
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263 | entity = jid.JID(element.getAttribute('jid', ' ')) |
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264 | except jid.InvalidFormat: |
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265 | entity = None |
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266 | nodeIdentifier = element.getAttribute('node', '') |
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267 | name = element.getAttribute('name') |
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268 | feature = DiscoItem(entity, nodeIdentifier, name) |
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269 | return feature |
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270 | |
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271 | |
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272 | |
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273 | class DiscoItems(object): |
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274 | """ |
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275 | XMPP service discovery items. |
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276 | |
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277 | @ivar nodeIdentifier: The optional node this info applies to. |
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278 | @type nodeIdentifier: C{unicode} |
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279 | @ivar _items: Sequence of added items. |
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280 | @type _items: C{list} |
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281 | """ |
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282 | |
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283 | def __init__(self): |
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284 | self.nodeIdentifier = '' |
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285 | self._items = [] |
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286 | |
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287 | |
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288 | def __iter__(self): |
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289 | """ |
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290 | Iterator over sequence of items in the order added. |
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291 | """ |
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292 | return iter(self._items) |
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293 | |
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294 | |
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295 | def append(self, item): |
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296 | """ |
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297 | Append item to the sequence of items. |
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298 | |
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299 | @param item: Item to be added. |
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300 | @type item: L{DiscoItem} |
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301 | """ |
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302 | self._items.append(item) |
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303 | |
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304 | |
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305 | def toElement(self): |
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306 | """ |
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307 | Generate a DOM representation. |
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308 | |
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309 | This takes the items added with C{append} to create a DOM |
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310 | representation of service discovery items. |
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311 | |
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312 | @rtype: L{domish.Element}. |
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313 | """ |
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314 | element = domish.Element((NS_DISCO_ITEMS, 'query')) |
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315 | |
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316 | if self.nodeIdentifier: |
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317 | element['node'] = self.nodeIdentifier |
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318 | |
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319 | for item in self: |
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320 | element.addChild(item.toElement()) |
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321 | |
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322 | return element |
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323 | |
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324 | |
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325 | @staticmethod |
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326 | def fromElement(element): |
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327 | """ |
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328 | Parse a DOM representation into a L{DiscoItems} instance. |
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329 | |
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330 | @param element: Element that represents the disco items. |
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331 | @type element: L{domish.Element}. |
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332 | @rtype L{DiscoItems}. |
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333 | """ |
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334 | |
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335 | info = DiscoItems() |
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336 | |
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337 | info.nodeIdentifier = element.getAttribute('node', '') |
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338 | |
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339 | for child in element.elements(): |
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340 | if (child.uri, child.name) == (NS_DISCO_ITEMS, 'item'): |
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341 | item = DiscoItem.fromElement(child) |
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342 | info.append(item) |
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343 | |
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344 | return info |
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345 | |
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346 | |
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347 | |
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348 | class _DiscoRequest(generic.Request): |
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349 | """ |
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350 | A Service Discovery request. |
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351 | |
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352 | @ivar verb: Type of request: C{'info'} or C{'items'}. |
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353 | @type verb: C{str} |
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354 | @ivar nodeIdentifier: Optional node to request info for. |
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355 | @type nodeIdentifier: C{unicode} |
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356 | """ |
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357 | |
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358 | verb = None |
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359 | nodeIdentifier = '' |
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360 | |
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361 | _requestVerbMap = { |
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362 | NS_DISCO_INFO: 'info', |
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363 | NS_DISCO_ITEMS: 'items', |
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364 | } |
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365 | |
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366 | _verbRequestMap = dict(((v, k) for k, v in _requestVerbMap.iteritems())) |
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367 | |
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368 | def __init__(self, verb=None, nodeIdentifier='', |
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369 | recipient=None, sender=None): |
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370 | generic.Request.__init__(self, recipient=recipient, sender=sender, |
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371 | stanzaType='get') |
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372 | self.verb = verb |
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373 | self.nodeIdentifier = nodeIdentifier |
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374 | |
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375 | |
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376 | def parseElement(self, element): |
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377 | generic.Request.parseElement(self, element) |
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378 | |
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379 | verbElement = None |
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380 | for child in element.elements(): |
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381 | if child.name == 'query' and child.uri in self._requestVerbMap: |
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382 | self.verb = self._requestVerbMap[child.uri] |
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383 | verbElement = child |
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384 | |
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385 | if verbElement: |
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386 | self.nodeIdentifier = verbElement.getAttribute('node', '') |
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387 | |
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388 | |
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389 | def toElement(self): |
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390 | element = generic.Request.toElement(self) |
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391 | |
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392 | childURI = self._verbRequestMap[self.verb] |
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393 | query = element.addElement((childURI, 'query')) |
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394 | |
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395 | if self.nodeIdentifier: |
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396 | query['node'] = self.nodeIdentifier |
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397 | |
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398 | return element |
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399 | |
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400 | |
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401 | |
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402 | class DiscoClientProtocol(XMPPHandler): |
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403 | """ |
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404 | XMPP Service Discovery client protocol. |
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405 | """ |
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406 | |
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407 | def requestInfo(self, entity, nodeIdentifier='', sender=None): |
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408 | """ |
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409 | Request information discovery from a node. |
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410 | |
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411 | @param entity: Entity to send the request to. |
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412 | @type entity: L{jid.JID} |
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413 | |
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414 | @param nodeIdentifier: Optional node to request info from. |
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415 | @type nodeIdentifier: C{unicode} |
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416 | |
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417 | @param sender: Optional sender address. |
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418 | @type sender: L{jid.JID} |
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419 | """ |
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420 | |
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421 | request = _DiscoRequest('info', nodeIdentifier) |
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422 | request.sender = sender |
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423 | request.recipient = entity |
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424 | |
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425 | d = self.request(request) |
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426 | d.addCallback(lambda iq: DiscoInfo.fromElement(iq.query)) |
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427 | return d |
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428 | |
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429 | |
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430 | def requestItems(self, entity, nodeIdentifier='', sender=None): |
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431 | """ |
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432 | Request items discovery from a node. |
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433 | |
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434 | @param entity: Entity to send the request to. |
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435 | @type entity: L{jid.JID} |
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436 | |
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437 | @param nodeIdentifier: Optional node to request info from. |
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438 | @type nodeIdentifier: C{unicode} |
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439 | |
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440 | @param sender: Optional sender address. |
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441 | @type sender: L{jid.JID} |
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442 | """ |
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443 | |
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444 | request = _DiscoRequest('items', nodeIdentifier) |
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445 | request.sender = sender |
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446 | request.recipient = entity |
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447 | |
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448 | d = self.request(request) |
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449 | d.addCallback(lambda iq: DiscoItems.fromElement(iq.query)) |
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450 | return d |
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451 | |
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452 | |
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453 | |
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454 | class DiscoHandler(XMPPHandler, IQHandlerMixin): |
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455 | """ |
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456 | Protocol implementation for XMPP Service Discovery. |
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457 | |
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458 | This handler will listen to XMPP service discovery requests and |
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459 | query the other handlers in L{parent} (see L{XMPPHandlerContainer}) for |
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460 | their identities, features and items according to L{IDisco}. |
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461 | """ |
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462 | |
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463 | iqHandlers = {DISCO_INFO: '_onDiscoInfo', |
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464 | DISCO_ITEMS: '_onDiscoItems'} |
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465 | |
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466 | def connectionInitialized(self): |
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467 | self.xmlstream.addObserver(DISCO_INFO, self.handleRequest) |
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468 | self.xmlstream.addObserver(DISCO_ITEMS, self.handleRequest) |
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469 | |
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470 | |
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471 | def _onDiscoInfo(self, iq): |
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472 | """ |
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473 | Called for incoming disco info requests. |
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474 | |
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475 | @param iq: The request iq element. |
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476 | @type iq: L{Element<twisted.words.xish.domish.Element>} |
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477 | """ |
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478 | request = _DiscoRequest.fromElement(iq) |
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479 | |
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480 | def toResponse(info): |
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481 | if request.nodeIdentifier and not info: |
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482 | raise error.StanzaError('item-not-found') |
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483 | else: |
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484 | response = DiscoInfo() |
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485 | response.nodeIdentifier = request.nodeIdentifier |
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486 | |
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487 | for item in info: |
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488 | response.append(item) |
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489 | |
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490 | return response.toElement() |
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491 | |
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492 | d = self.info(request.sender, request.recipient, |
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493 | request.nodeIdentifier) |
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494 | d.addCallback(toResponse) |
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495 | return d |
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496 | |
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497 | |
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498 | def _onDiscoItems(self, iq): |
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499 | """ |
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500 | Called for incoming disco items requests. |
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501 | |
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502 | @param iq: The request iq element. |
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503 | @type iq: L{Element<twisted.words.xish.domish.Element>} |
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504 | """ |
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505 | request = _DiscoRequest.fromElement(iq) |
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506 | |
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507 | def toResponse(items): |
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508 | response = DiscoItems() |
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509 | response.nodeIdentifier = request.nodeIdentifier |
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510 | |
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511 | for item in items: |
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512 | response.append(item) |
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513 | |
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514 | return response.toElement() |
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515 | |
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516 | d = self.items(request.sender, request.recipient, |
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517 | request.nodeIdentifier) |
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518 | d.addCallback(toResponse) |
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519 | return d |
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520 | |
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521 | |
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522 | def _gatherResults(self, deferredList): |
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523 | """ |
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524 | Gather results from a list of deferreds. |
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525 | |
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526 | Similar to L{defer.gatherResults}, but flattens the returned results, |
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527 | consumes errors after the first one and fires the errback of the |
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528 | returned deferred with the failure of the first deferred that fires its |
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529 | errback. |
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530 | |
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531 | @param deferredList: List of deferreds for which the results should be |
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532 | gathered. |
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533 | @type deferredList: C{list} |
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534 | @return: Deferred that fires with a list of gathered results. |
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535 | @rtype: L{defer.Deferred} |
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536 | """ |
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537 | def cb(resultList): |
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538 | results = [] |
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539 | for success, value in resultList: |
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540 | results.extend(value) |
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541 | return results |
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542 | |
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543 | def eb(failure): |
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544 | failure.trap(defer.FirstError) |
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545 | return failure.value.subFailure |
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546 | |
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547 | d = defer.DeferredList(deferredList, fireOnOneErrback=1, |
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548 | consumeErrors=1) |
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549 | d.addCallbacks(cb, eb) |
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550 | return d |
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551 | |
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552 | |
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553 | def info(self, requestor, target, nodeIdentifier): |
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554 | """ |
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555 | Inspect all sibling protocol handlers for disco info. |
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556 | |
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557 | Calls the L{getDiscoInfo<IDisco.getDiscoInfo>} method on all child |
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558 | handlers of the parent, that provide L{IDisco}. |
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559 | |
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560 | @param requestor: The entity that sent the request. |
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561 | @type requestor: L{JID<twisted.words.protocols.jabber.jid.JID>} |
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562 | @param target: The entity the request was sent to. |
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563 | @type target: L{JID<twisted.words.protocols.jabber.jid.JID>} |
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564 | @param nodeIdentifier: The optional node being queried, or C{''}. |
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565 | @type nodeIdentifier: C{unicode} |
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566 | @return: Deferred with the gathered results from sibling handlers. |
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567 | @rtype: L{defer.Deferred} |
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568 | """ |
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569 | dl = [defer.maybeDeferred(handler.getDiscoInfo, requestor, target, |
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570 | nodeIdentifier) |
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571 | for handler in self.parent |
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572 | if IDisco.providedBy(handler)] |
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573 | return self._gatherResults(dl) |
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574 | |
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575 | |
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576 | def items(self, requestor, target, nodeIdentifier): |
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577 | """ |
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578 | Inspect all sibling protocol handlers for disco items. |
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579 | |
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580 | Calls the L{getDiscoItems<IDisco.getDiscoItems>} method on all child |
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581 | handlers of the parent, that provide L{IDisco}. |
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582 | |
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583 | @param requestor: The entity that sent the request. |
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584 | @type requestor: L{JID<twisted.words.protocols.jabber.jid.JID>} |
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585 | @param target: The entity the request was sent to. |
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586 | @type target: L{JID<twisted.words.protocols.jabber.jid.JID>} |
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587 | @param nodeIdentifier: The optional node being queried, or C{''}. |
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588 | @type nodeIdentifier: C{unicode} |
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589 | @return: Deferred with the gathered results from sibling handlers. |
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590 | @rtype: L{defer.Deferred} |
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591 | """ |
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592 | dl = [defer.maybeDeferred(handler.getDiscoItems, requestor, target, |
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593 | nodeIdentifier) |
---|
594 | for handler in self.parent |
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595 | if IDisco.providedBy(handler)] |
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596 | return self._gatherResults(dl) |
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