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annotate mod_muc_moderation_delay/delay.lib.lua @ 5938:959382fac20c

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mod_muc_moderation_delay: first commit to prosody-modules.
author John Livingston <git@john-livingston.fr>
date Fri, 26 Jul 2024 15:36:05 +0200
parents
children a86720654fb9
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5938
959382fac20c mod_muc_moderation_delay: first commit to prosody-modules.
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1 -- SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
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2 -- SPDX-License-Identifier: AGPL-3.0-only
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3 local st = require "util.stanza";
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4 local timer = require "util.timer";
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5 local get_time = require "util.time".now;
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6 local get_moderation_delay = module:require("config").get_moderation_delay;
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7
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8 local muc_util = module:require "muc/util";
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9 local valid_roles = muc_util.valid_roles;
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10
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11 local moderation_delay_tag = "moderation-delay";
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12 local xmlns_fasten = "urn:xmpp:fasten:0";
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13 local xmlns_moderated_0 = "urn:xmpp:message-moderate:0";
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14 local xmlns_retract_0 = "urn:xmpp:message-retract:0";
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15 local xmlns_moderated_1 = "urn:xmpp:message-moderate:1";
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16 local xmlns_retract_1 = "urn:xmpp:message-retract:1";
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17 local xmlns_st_id = "urn:xmpp:sid:0";
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18
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19 local queued_stanza_id_timers = {};
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20
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21 -- tests if a stanza is a retractation message.
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22 local function is_retractation_for_stanza_id(stanza)
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23 -- XEP 0425 was revised in 2023. For now, mod_muc_moderation uses the previous version.
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24 -- But we will make the code compatible with both.
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25 local apply_to = stanza:get_child("apply-to", xmlns_fasten);
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26 if apply_to and apply_to.attr.id then
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27 local moderated = apply_to:get_child("moderated", xmlns_moderated_0);
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28 if moderated then
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29 local retract = moderated:get_child("retract", xmlns_retract_0);
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30 if retract then
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31 return apply_to.attr.id;
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32 end
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33 end
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34 end
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35
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36 local moderated = stanza:get_child("moderated", xmlns_moderated_1);
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37 if moderated then
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38 if moderated:get_child("retract", xmlns_retract_1) then
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39 return moderated.attr.id;
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40 end
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41 end
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42
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43 return nil;
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44 end
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45
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46 -- handler for muc-broadcast-message
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47 local function handle_broadcast_message(event)
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48 local room, stanza = event.room, event.stanza;
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49 local delay = get_moderation_delay(room);
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50 if delay == nil then
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51 -- feature disabled on the room, go for it.
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52 return;
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53 end
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54
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55 -- only delay groupchat messages with body.
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56 if stanza.attr.type ~= "groupchat" then
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57 return;
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58 end
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59
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60 -- detect retractations:
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61 local retracted_stanza_id = is_retractation_for_stanza_id(stanza);
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62 if retracted_stanza_id then
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63 module:log("debug", "Got a retractation message for %s", retracted_stanza_id);
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64 if queued_stanza_id_timers[retracted_stanza_id] then
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65 module:log("info", "Got a retractation message, for message %s that is currently waiting for broadcast. Cancelling.", retracted_stanza_id);
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66 timer.stop(queued_stanza_id_timers[retracted_stanza_id]);
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67 queued_stanza_id_timers[retracted_stanza_id] = nil;
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68 -- and we continue...
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69 end
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70 end
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71
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72 if not stanza:get_child("body") then
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73 -- Dont want to delay message without body.
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74 -- This is usually messages like "xxx is typing", or any other service message.
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75 -- This also should concern retractation messages.
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76 -- Clients that will receive retractation messages for message they never got, should just drop them. And that's ok.
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77 return;
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78 end
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79
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80 local stanza_id = nil; -- message stanza id... can be nil!
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81 local stanza_id_child = stanza:get_child("stanza-id", xmlns_st_id);
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82 if not stanza_id_child then
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83 -- this can happen when muc is not archived!
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84 -- in such case, message retractation is not possible.
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85 -- so, this is a normal use case, and we should handle it properly.
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86 else
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87 stanza_id = stanza_id_child.attr.id;
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88 end
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89 local id = stanza.attr.id;
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90 if not id then
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91 -- message should alway have an id, but just in case...
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92 module:log("warn", "Message has no id, wont delay it.");
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93 return;
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94 end
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95
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96 -- Message must be delayed, except for:
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97 -- * room moderators
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98 -- * the user that sent the message (if they don't get the echo quickly, their clients could have weird behaviours)
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99 module:log("debug", "Message %s / %s must be delayed by %i seconds, sending first broadcast wave.", id, stanza_id, delay);
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100 local moderator_role_value = valid_roles["moderator"];
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101
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102 local cloned_stanza = st.clone(stanza); -- we must clone, to send a copy for the second wave.
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103
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104 -- first of all, if the initiator occupant is not moderator, me must send to them.
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105 -- (delaying the echo message could have some quircks in some xmpp clients)
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106 if stanza.attr.from then
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107 local from_occupant = room:get_occupant_by_nick(stanza.attr.from);
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108 if from_occupant and valid_roles[from_occupant.role or "none"] < moderator_role_value then
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109 module:log("debug", "Message %s / %s must be sent separatly to it initialior %s.", id, stanza_id, delay, stanza.attr.from);
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110 room:route_to_occupant(from_occupant, stanza);
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111 end
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112 end
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113
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114 -- adding a tag, so that moderators can know that this message is delayed.
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115 stanza:tag(moderation_delay_tag, {
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116 delay = "" .. delay;
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117 waiting = string.format("%i", get_time() + delay);
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118 }):up();
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119
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120 -- then, sending to moderators (and only moderators):
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121 room:broadcast(stanza, function (nick, occupant)
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122 if valid_roles[occupant.role or "none"] >= moderator_role_value then
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123 return true;
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124 end
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125 return false;
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126 end);
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127
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128 local task = timer.add_task(delay, function ()
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129 module:log("debug", "Message %s has been delayed, sending to remaining participants.", id);
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130 room:broadcast(cloned_stanza, function (nick, occupant)
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131 if valid_roles[occupant.role or "none"] >= moderator_role_value then
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132 return false;
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133 end
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134 if nick == stanza.attr.from then
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135 -- we already sent it to them (because they are moderator, or because we sent them separately)
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136 return false;
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137 end
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138 return true;
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139 end);
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140 end);
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141 if stanza_id then
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142 -- store it, so we can stop timer if there is a retractation.
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143 queued_stanza_id_timers[stanza_id] = task;
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144 end
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145
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146 return true; -- stop the default broadcast_message processing.
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147 end
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148
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149 return {
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150 handle_broadcast_message = handle_broadcast_message;
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151 };