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annotate mod_muc_occupant_id/mod_muc_occupant_id.lua @ 5648:c217f4edfc4f

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misc/mtail: Start of an mtail config Stashing it here in case anyone wants to continue working on it. Currently it's only counting log messages by level. Due to the permissions set by systemd on Prosody logs, mtail never managed to start correctly until permissions were manually relaxed.
author Kim Alvefur <zash@zash.se>
date Sun, 17 Sep 2023 13:36:30 +0200
parents ae27f3359df8
children
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1
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2 -- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
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3 -- XEP-0421: Anonymous unique occupant identifiers for MUCs
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5 module:depends("muc");
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7 local uuid = require "util.uuid";
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8 local hmac_sha256 = require "util.hashes".hmac_sha256;
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9 local b64encode = require "util.encodings".base64.encode;
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11 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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13 local function generate_id(occupant, room)
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14 local bare = occupant.bare_jid;
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16 if room._data.occupant_id_salt == nil then
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17 room._data.occupant_id_salt = uuid.generate();
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18 end
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20 -- XXX: Temporary not-so-important migration measure. Remove this next time
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21 -- somebody looks at it. This module used to store every participant's
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22 -- occupant-id all the time forever.
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23 room._data.occupant_ids = nil;
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25 return b64encode(hmac_sha256(bare, room._data.occupant_id_salt));
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26 end
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28 local function update_occupant(event)
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29 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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31 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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32 if dest_occupant ~= nil then
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33 occupant = dest_occupant;
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34 end
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36 -- strip any existing <occupant-id/> tags to avoid forgery
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37 stanza:remove_children("occupant-id", xmlns_occupant_id);
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39 local unique_id = generate_id(occupant, room);
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40 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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41 end
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43 local function muc_private(event)
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44 local stanza, room = event.stanza, event.room;
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45 local occupant = room._occupants[stanza.attr.from];
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47 update_occupant({
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48 stanza = stanza,
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49 room = room,
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50 occupant = occupant,
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51 });
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52 end
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54 module:add_feature(xmlns_occupant_id);
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55 module:hook("muc-disco#info", function (event)
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56 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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57 end);
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58
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59 module:hook("muc-broadcast-presence", update_occupant);
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60 module:hook("muc-occupant-pre-join", update_occupant);
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61 module:hook("muc-occupant-pre-change", update_occupant);
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62 module:hook("muc-occupant-groupchat", update_occupant);
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63 module:hook("muc-private-message", muc_private);