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annotate src/plugins/plugin_xep_0059.py @ 1223:802b7e6bf098

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author souliane <souliane@mailoo.org>
date Sat, 04 Oct 2014 10:23:13 +0200
parents 16484ebb695b
children ea692d51a0ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1219
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
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parents:
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Result Set Management (XEP-0059)
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2013, 2014 Adrien Cossa (souliane@mailoo.org)
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7
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8 # This program is free software: you can redistribute it and/or modify
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9 # it under the terms of the GNU Affero General Public License as published by
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
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10 # the Free Software Foundation, either version 3 of the License, or
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11 # (at your option) any later version.
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12
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13 # This program is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
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16 # GNU Affero General Public License for more details.
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17
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18 # You should have received a copy of the GNU Affero General Public License
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
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19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 from sat.core.i18n import _
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22 from sat.core.log import getLogger
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23 log = getLogger(__name__)
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24
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25 from twisted.words.xish import domish
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26 from wokkel import disco, iwokkel
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27 try:
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28 from twisted.words.protocols.xmlstream import XMPPHandler
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29 except ImportError:
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30 from wokkel.subprotocols import XMPPHandler
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31 from zope.interface import implements
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32
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33
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34 NS_RSM = 'http://jabber.org/protocol/rsm'
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35
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36 PLUGIN_INFO = {
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37 "name": "Result Set Management",
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38 "import_name": "XEP-0059",
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39 "type": "XEP",
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40 "protocols": ["XEP-0059"],
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41 "main": "XEP_0059",
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42 "handler": "no",
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43 "description": _("""Implementation of Result Set Management""")
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44 }
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45
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46
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47 class XEP_0059(object):
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48
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49 def __init__(self, host):
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50 log.info(_("Result Set Management plugin initialization"))
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51 self.host = host
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52
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53 def requestPage(self, stanza, limit=10, index=None, after=None, before=None):
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54 """Embed a RSM page request in the given stanza.
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55
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56 @param stanza (domish.Element): any stanza to which RSM applies
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57 @param limit (int): the maximum number of items in the page
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58 @param index (int): the starting index of the requested page
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59 @param after (str, int): the element immediately preceding the page
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60 @param before (str, int): the element immediately following the page
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61 """
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62 main_elt = None
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63 try:
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64 main_elt = domish.generateElementsNamed(stanza.elements(), name="query").next()
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65 except StopIteration:
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66 try:
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67 main_elt = domish.generateElementsNamed(stanza.elements(), name="pubsub").next()
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68 except StopIteration:
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69 log.warning("Injection of a RSM element only applies to query or pubsub stanzas")
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70 return
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71 limit = str(int(limit))
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72
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73 # in case the service doesn't support RSM, do this at least
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74 main_elt.items.attributes['max_items'] = limit
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75
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76 set_elt = main_elt.addElement('set', NS_RSM)
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77 set_elt.addElement('max').addContent(limit)
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78 if index:
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79 assert(after is None and before is None)
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80 set_elt.addElement('index').addContent(str(int(index)))
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81 if after:
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82 assert(before is None) # could not specify both at the same time
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83 set_elt.addElement('after').addContent(str(after))
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84 if before is not None:
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85 if before == '': # request the last page, according to http://xmpp.org/extensions/xep-0059.html#last
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86 set_elt.addElement('before')
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87 else:
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88 set_elt.addElement('before').addContent(str(before))
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89
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90 def countItems(self, stanza):
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91 """Count the items without retrieving any of them.
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92
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93 @param stanza (domish.Element): any stanza to which RSM applies
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94 """
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95 self.requestPage(stanza, limit=0)
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96
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97 def extractMetadata(self, stanza):
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98 """Extract the RSM metadata from the given stanza.
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99
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100 @param stanza (domish.Element, wokkel.pubsub.PubSubRequest):
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101 any stanza to which RSM applies. When used by XEP-0060,
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102 wokkel's PubSubRequest instance is also accepted.
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103 @return: dict containing the page metadata
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104 """
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105 try:
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106 main_elt = domish.generateElementsNamed(stanza.elements(), name="query").next()
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107 except StopIteration:
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108 try:
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109 main_elt = domish.generateElementsNamed(stanza.elements(), name="pubsub").next()
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110 except StopIteration:
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111 log.warning("Extracting data from a RSM element only applies to query or pubsub stanzas")
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112 return {}
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113 try:
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114 set_elt = domish.generateElementsQNamed(main_elt.elements(), name="set", uri=NS_RSM).next()
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115 except StopIteration:
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116 log.debug("There's no RSM element in the stanza")
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117 return {}
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118
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119 data = {}
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120 elts = set_elt.elements()
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121 try:
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122 elt = elts.next()
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123 if elt.name == "first":
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124 data["first"] = "".join(elt.children)
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125 data["first_index"] = int(elt.getAttribute("index"))
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126 elif elt.name == "last":
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127 data["last"] = "".join(elt.children)
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128 elif elt.name == "count":
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129 data["count"] = int("".join(elt.children))
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130 except StopIteration:
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131 pass
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souliane <souliane@mailoo.org>
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132 if "count" not in data:
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133 log.warning("There's no 'count' element in the RSM element!")
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134 return data
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135
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
souliane <souliane@mailoo.org>
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136
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137 class XEP_0059_handler(XMPPHandler):
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138 implements(iwokkel.IDisco)
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139
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140 def __init__(self, plugin_parent, profile):
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141 self.plugin_parent = plugin_parent
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142 self.host = plugin_parent.host
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143 self.profile = profile
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144
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145 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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146 return [disco.DiscoFeature(NS_RSM)]
16484ebb695b plugin XEP-0059: first draft, pubsub and jabber search do not exploit it yet
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147
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148 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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149 return []