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annotate libervia/backend/plugins/plugin_xep_0334.py @ 4335:430d5d99a740

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plugin XEP-0358: "Publishing Available Jingle Sessions" implementation: rel 453
author Goffi <goffi@goffi.org>
date Tue, 03 Dec 2024 00:13:07 +0100
parents 0d7bb4df2343
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for Delayed Delivery (XEP-0334)
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2013-2016 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
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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
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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
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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 typing import Iterable
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22 from libervia.backend.core.i18n import _, D_
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23 from libervia.backend.core.log import getLogger
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24
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25 log = getLogger(__name__)
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26 from libervia.backend.core.constants import Const as C
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27
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28 from libervia.backend.tools.common import data_format
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29
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30 from wokkel import disco, iwokkel
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31
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32 from twisted.words.protocols.jabber import xmlstream
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33 from twisted.words.xish import domish
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34 from zope.interface import implementer
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35 from textwrap import dedent
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37
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38 PLUGIN_INFO = {
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39 C.PI_NAME: "Message Processing Hints",
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40 C.PI_IMPORT_NAME: "XEP-0334",
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41 C.PI_TYPE: "XEP",
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42 C.PI_MODES: C.PLUG_MODE_BOTH,
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43 C.PI_PROTOCOLS: ["XEP-0334"],
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44 C.PI_MAIN: "XEP_0334",
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45 C.PI_HANDLER: "yes",
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46 C.PI_DESCRIPTION: D_("""Implementation of Message Processing Hints"""),
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47 C.PI_USAGE: dedent(
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48 D_(
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49 """\
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50 Frontends can use HINT_* constants in mess_data['extra'] in a serialized 'hints' dict.
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51 Internal plugins can use directly add_hint([HINT_* constant]).
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52 Will set mess_data['extra']['history'] to 'skipped' when no store is requested and message is not saved in history."""
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53 )
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54 ),
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55 }
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56
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57 NS_HINTS = "urn:xmpp:hints"
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58
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59
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60 class XEP_0334(object):
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61 HINT_NO_PERMANENT_STORE = "no-permanent-store"
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62 HINT_NO_STORE = "no-store"
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63 HINT_NO_COPY = "no-copy"
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64 HINT_STORE = "store"
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65 HINTS = (HINT_NO_PERMANENT_STORE, HINT_NO_STORE, HINT_NO_COPY, HINT_STORE)
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66
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67 def __init__(self, host):
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68 log.info(_("Message Processing Hints plugin initialization"))
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69 self.host = host
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70 host.trigger.add("sendMessage", self.send_message_trigger)
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71 host.trigger.add(
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72 "message_received", self.message_received_trigger, priority=-1000
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73 )
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74
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75 def get_handler(self, client):
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76 return XEP_0334_handler()
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77
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78 def add_hint(self, mess_data, hint):
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79 if hint == self.HINT_NO_COPY and not mess_data["to"].resource:
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80 log.error(
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81 "{hint} can only be used with full jids! Ignoring it.".format(hint=hint)
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82 )
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83 return
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84 hints = mess_data.setdefault("hints", set())
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85 if hint in self.HINTS:
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86 hints.add(hint)
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87 else:
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88 log.error("Unknown hint: {}".format(hint))
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89
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90 def add_hint_elements(
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91 self, message_elt: domish.Element, hints: Iterable[str]
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92 ) -> None:
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93 """Add hints elements to message stanza
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94
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95 @param message_elt: stanza where hints must be added
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96 @param hints: hints to add
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97 """
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98 for hint in hints:
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99 if not list(message_elt.elements(NS_HINTS, hint)):
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100 message_elt.addElement((NS_HINTS, hint))
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101 else:
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102 log.debug(f"Not adding {hint!r} hint: it is already present in <message>")
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103
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104 def _send_post_xml_treatment(self, mess_data):
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105 if "hints" in mess_data:
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106 self.add_hint_elements(mess_data["xml"], mess_data["hints"])
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107 return mess_data
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108
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109 def send_message_trigger(
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110 self, client, mess_data, pre_xml_treatments, post_xml_treatments
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111 ):
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112 """Add the hints element to the message to be sent"""
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113 if "hints" in mess_data["extra"]:
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114 for hint in data_format.dict2iter("hints", mess_data["extra"], pop=True):
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115 self.add_hint(hint)
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116
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117 post_xml_treatments.addCallback(self._send_post_xml_treatment)
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118 return True
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119
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120 def _received_skip_history(self, mess_data):
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121 mess_data["history"] = C.HISTORY_SKIP
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122 return mess_data
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123
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124 def message_received_trigger(self, client, message_elt, post_treat):
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125 """Check for hints in the received message"""
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126 for elt in message_elt.elements():
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127 if elt.uri == NS_HINTS and elt.name in (
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128 self.HINT_NO_PERMANENT_STORE,
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129 self.HINT_NO_STORE,
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130 ):
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131 log.debug("history will be skipped for this message, as requested")
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132 post_treat.addCallback(self._received_skip_history)
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133 break
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134 return True
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135
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136
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137 @implementer(iwokkel.IDisco)
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138 class XEP_0334_handler(xmlstream.XMPPHandler):
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139
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140 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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141 return [disco.DiscoFeature(NS_HINTS)]
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142
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143 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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144 return []