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annotate sat/plugins/plugin_xep_0422.py @ 3959:da0e772881c3

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cli (pubsub): new `signature` subcommands: A first `check` command can be used to check signature using the signature JSON data. More commands should follow to check or sign items. rel 381
author Goffi <goffi@goffi.org>
date Fri, 28 Oct 2022 18:47:17 +0200
parents 60724ff3f273
children 524856bd7b19
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3799
60724ff3f273 plugin XEP-0422: Message Fastening implementation:
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1 #!/usr/bin/env python3
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2
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3 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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4
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5 # This program is free software: you can redistribute it and/or modify
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6 # it under the terms of the GNU Affero General Public License as published by
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7 # the Free Software Foundation, either version 3 of the License, or
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8 # (at your option) any later version.
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9
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10 # This program is distributed in the hope that it will be useful,
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 # GNU Affero General Public License for more details.
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14
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15 # You should have received a copy of the GNU Affero General Public License
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16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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17
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18 from typing import Optional, List, Tuple, Union, NamedTuple
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19 from collections import namedtuple
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20
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21 from twisted.words.protocols.jabber import xmlstream
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22 from twisted.words.xish import domish
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23 from wokkel import disco
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24 from zope.interface import implementer
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25
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26 from sat.core.constants import Const as C
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27 from sat.core.i18n import _
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28 from sat.core.log import getLogger
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29 from sat.core.core_types import SatXMPPEntity
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30 from sat.memory.sqla_mapping import History
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31 from sat.tools.common.async_utils import async_lru
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32
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33 log = getLogger(__name__)
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34
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "Message Fastening",
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38 C.PI_IMPORT_NAME: "XEP-0422",
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39 C.PI_TYPE: "XEP",
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40 C.PI_MODES: C.PLUG_MODE_BOTH,
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41 C.PI_PROTOCOLS: ["XEP-0359", "XEP-0422"],
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42 C.PI_MAIN: "XEP_0422",
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43 C.PI_HANDLER: "yes",
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44 C.PI_DESCRIPTION: _("""Implementation Message Fastening"""),
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45 }
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46
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47 NS_FASTEN = "urn:xmpp:fasten:0"
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48
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49
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50 class FastenMetadata(NamedTuple):
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51 elements: List[domish.Element]
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52 id: str
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53 history: Optional[History]
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54 clear: bool
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55 shell: bool
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56
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57
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58 class XEP_0422(object):
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59
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60 def __init__(self, host):
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61 log.info(_("XEP-0422 (Message Fastening) plugin initialization"))
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62 self.host = host
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63 host.registerNamespace("fasten", NS_FASTEN)
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64
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65 def getHandler(self, __):
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66 return XEP_0422_handler()
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67
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68 def applyToElt(
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69 self,
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70 message_elt: domish.Element,
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71 origin_id: str,
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72 clear: Optional[bool] = None,
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73 shell: Optional[bool] = None,
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74 children: Optional[List[domish.Element]] = None,
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75 external: Optional[List[Union[str, Tuple[str, str]]]] = None
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76 ) -> domish.Element:
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77 """Generate, add and return <apply-to> element
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78
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79 @param message_elt: wrapping <message> element
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80 @param origin_id: origin ID of the target message
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81 @param clear: set to True to remove a fastening
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82 @param shell: set to True when using e2ee shell
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83 cf. https://xmpp.org/extensions/xep-0422.html#encryption
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84 @param children: element to fasten to the target message
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85 <apply-to> element is returned, thus children can also easily be added
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86 afterwards
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87 @param external: <external> element to add
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88 cf. https://xmpp.org/extensions/xep-0422.html#external-payloads
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89 the list items can either be a str with only the element name,
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90 or a tuple which must then be (namespace, name)
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91 @return: <apply-to> element, which is already added to the wrapping message_elt
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92 """
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93 apply_to_elt = message_elt.addElement((NS_FASTEN, "apply-to"))
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94 apply_to_elt["id"] = origin_id
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95 if clear is not None:
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96 apply_to_elt["clear"] = C.boolConst(clear)
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97 if shell is not None:
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98 apply_to_elt["shell"] = C.boolConst(shell)
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99 if children is not None:
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100 for child in children:
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101 apply_to_elt.addChild(child)
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102 if external is not None:
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103 for ext in external:
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104 external_elt = apply_to_elt.addElement("external")
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105 if isinstance(ext, str):
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106 external_elt["name"] = ext
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107 else:
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108 ns, name = ext
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109 external_elt["name"] = name
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110 external_elt["element-namespace"] = ns
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111 return apply_to_elt
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112
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113 @async_lru(maxsize=5)
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114 async def getFastenedElts(
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115 self,
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116 client: SatXMPPEntity,
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117 message_elt: domish.Element
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118 ) -> Optional[FastenMetadata]:
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119 """Get fastened elements
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120
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121 if the message contains no <apply-to> element, None is returned
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122 """
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123 try:
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124 apply_to_elt = next(message_elt.elements(NS_FASTEN, "apply-to"))
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125 except StopIteration:
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126 return None
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127 else:
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128 origin_id = apply_to_elt.getAttribute("id")
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129 if not origin_id:
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130 log.warning(
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131 f"Received invalid fastening message: {message_elt.toXml()}"
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132 )
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133 return None
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134 elements = apply_to_elt.children
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135 if not elements:
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136 log.warning(f"No element to fasten: {message_elt.toXml()}")
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137 return None
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138 history = await self.host.memory.storage.get(
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139 client,
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140 History,
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141 History.origin_id,
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142 origin_id,
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143 (History.messages, History.subjects, History.thread)
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144 )
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145 return FastenMetadata(
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146 elements,
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147 origin_id,
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148 history,
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149 C.bool(apply_to_elt.getAttribute("clear", C.BOOL_FALSE)),
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150 C.bool(apply_to_elt.getAttribute("shell", C.BOOL_FALSE)),
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151 )
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152
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153
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154 @implementer(disco.IDisco)
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155 class XEP_0422_handler(xmlstream.XMPPHandler):
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156
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157 def getDiscoInfo(self, __, target, nodeIdentifier=""):
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158 return [disco.DiscoFeature(NS_FASTEN)]
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159
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160 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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161 return []