Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0059.py @ 4165:81faa85c9cfa

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author Goffi <goffi@goffi.org>
date Tue, 28 Nov 2023 17:41:49 +0100
parents 4b842c1fb686
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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3 # Result Set Management (XEP-0059)
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.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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20 from typing import Optional
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21 from zope.interface import implementer
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22 from twisted.words.protocols.jabber import xmlstream
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23 from wokkel import disco
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24 from wokkel import iwokkel
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25 from wokkel import rsm
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26 from libervia.backend.core.i18n import _
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27 from libervia.backend.core.constants import Const as C
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28 from libervia.backend.core.log import getLogger
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29
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30
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31 log = getLogger(__name__)
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32
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33
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34 PLUGIN_INFO = {
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35 C.PI_NAME: "Result Set Management",
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36 C.PI_IMPORT_NAME: "XEP-0059",
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37 C.PI_TYPE: "XEP",
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38 C.PI_MODES: C.PLUG_MODE_BOTH,
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39 C.PI_PROTOCOLS: ["XEP-0059"],
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40 C.PI_MAIN: "XEP_0059",
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41 C.PI_HANDLER: "yes",
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42 C.PI_DESCRIPTION: _("""Implementation of Result Set Management"""),
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43 }
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44
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45 RSM_PREFIX = "rsm_"
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46
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47
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48 class XEP_0059(object):
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49 # XXX: RSM management is done directly in Wokkel.
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50
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51 def __init__(self, host):
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52 log.info(_("Result Set Management plugin initialization"))
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53
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54 def get_handler(self, client):
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55 return XEP_0059_handler()
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56
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57 def parse_extra(self, extra):
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58 """Parse extra dictionnary to retrieve RSM arguments
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59
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60 @param extra(dict): data for parse
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61 @return (rsm.RSMRequest, None): request with parsed arguments
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62 or None if no RSM arguments have been found
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63 """
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64 if int(extra.get(RSM_PREFIX + 'max', 0)) < 0:
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65 raise ValueError(_("rsm_max can't be negative"))
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66
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67 rsm_args = {}
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68 for arg in ("max", "after", "before", "index"):
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69 try:
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70 argname = "max_" if arg == "max" else arg
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71 rsm_args[argname] = extra.pop(RSM_PREFIX + arg)
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72 except KeyError:
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73 continue
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74
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75 if rsm_args:
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76 return rsm.RSMRequest(**rsm_args)
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77 else:
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78 return None
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79
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80 def response2dict(self, rsm_response, data=None):
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81 """Return a dict with RSM response
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82
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83 Key set in data can be:
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84 - rsm_first: first item id in the page
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85 - rsm_last: last item id in the page
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86 - rsm_index: position of the first item in the full set (may be approximate)
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87 - rsm_count: total number of items in the full set (may be approximage)
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88 If a value doesn't exists, it's not set.
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89 All values are set as strings.
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90 @param rsm_response(rsm.RSMResponse): response to parse
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91 @param data(dict, None): dict to update with rsm_* data.
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92 If None, a new dict is created
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93 @return (dict): data dict
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94 """
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95 if data is None:
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96 data = {}
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97 if rsm_response.first is not None:
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98 data["first"] = rsm_response.first
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99 if rsm_response.last is not None:
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100 data["last"] = rsm_response.last
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101 if rsm_response.index is not None:
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102 data["index"] = rsm_response.index
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103 return data
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104
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105 def get_next_request(
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106 self,
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107 rsm_request: rsm.RSMRequest,
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108 rsm_response: rsm.RSMResponse,
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109 log_progress: bool = True,
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110 ) -> Optional[rsm.RSMRequest]:
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111 """Generate next request to paginate through all items
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112
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113 Page will be retrieved forward
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114 @param rsm_request: last request used
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115 @param rsm_response: response from the last request
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116 @return: request to retrive next page, or None if we are at the end
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117 or if pagination is not possible
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118 """
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119 if rsm_request.max == 0:
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120 log.warning("Can't do pagination if max is 0")
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121 return None
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122 if rsm_response is None:
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123 # may happen if result set it empty, or we are at the end
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124 return None
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125 if (
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126 rsm_response.count is not None
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127 and rsm_response.index is not None
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128 ):
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129 next_index = rsm_response.index + rsm_request.max
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130 if next_index >= rsm_response.count:
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131 # we have reached the last page
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132 return None
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133
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134 if log_progress:
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135 log.debug(
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136 f"retrieving items {next_index} to "
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137 f"{min(next_index+rsm_request.max, rsm_response.count)} on "
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138 f"{rsm_response.count} ({next_index/rsm_response.count*100:.2f}%)"
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139 )
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140
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141 if rsm_response.last is None:
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766729ac4146 plugin XEP-0059: don't show warning message when <last> is missing if there is not message
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142 if rsm_response.count:
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143 log.warning("Can't do pagination, no \"last\" received")
3592
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144 return None
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145
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146 return rsm.RSMRequest(
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147 max_=rsm_request.max,
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148 after=rsm_response.last
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149 )
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150
1219
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151
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ab2696e34d29 Python 3 port:
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152 @implementer(iwokkel.IDisco)
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153 class XEP_0059_handler(xmlstream.XMPPHandler):
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154
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155 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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156 return [disco.DiscoFeature(rsm.NS_RSM)]
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157
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158 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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159 return []