prosody
82f6a0b0a425
plugins/muc/occupant_id.lib.lua

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plugins/muc/occupant_id.lib.lua @ 12037:82f6a0b0a425

tools/generate_format_spec: Apply lua-format to silence luacheck
author Kim Alvefur <zash@zash.se>
date Sat, 11 Dec 2021 20:58:09 +0100
parent 11215:9ce0a899ff07
child 12108:e9882c4c397f
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rev   line source
11215
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1 -- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
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2 -- XEP-0421: Anonymous unique occupant identifiers for MUCs
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3
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4 -- (C) 2020 Maxime “pep” Buquet <pep@bouah.net>
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5 -- (C) 2020 Matthew Wild <mwild1@gmail.com>
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6
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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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10
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11 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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12
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13 local function get_occupant_id(room, occupant)
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14 if occupant.stable_id then
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15 return occupant.stable_id;
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16 end
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17
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18 local salt = room._data.occupant_id_salt;
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19 if not salt then
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20 salt = uuid.generate();
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21 room._data.occupant_id_salt = salt;
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22 end
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23
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24 occupant.stable_id = b64encode(hmac_sha256(occupant.bare_jid, salt));
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25
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26 return occupant.stable_id;
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27 end
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28
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29 local function update_occupant(event)
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30 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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31
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32 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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33 if dest_occupant ~= nil then
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34 occupant = dest_occupant;
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35 end
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36
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37 -- strip any existing <occupant-id/> tags to avoid forgery
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38 stanza:remove_children("occupant-id", xmlns_occupant_id);
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39
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40 local unique_id = get_occupant_id(room, occupant);
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41 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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42 end
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43
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44 local function muc_private(event)
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45 local stanza, room = event.stanza, event.room;
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46 local occupant = room._occupants[stanza.attr.from];
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47
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48 update_occupant({
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49 stanza = stanza,
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50 room = room,
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51 occupant = occupant,
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52 });
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53 end
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54
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55 if module:get_option_boolean("muc_occupant_id", true) then
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56 module:add_feature(xmlns_occupant_id);
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57 module:hook("muc-disco#info", function (event)
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58 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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59 end);
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60
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61 module:hook("muc-broadcast-presence", update_occupant);
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62 module:hook("muc-occupant-pre-join", update_occupant);
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63 module:hook("muc-occupant-pre-change", update_occupant);
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64 module:hook("muc-occupant-groupchat", update_occupant);
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65 module:hook("muc-private-message", muc_private);
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66 end
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67
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68 return {
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69 get_occupant_id = get_occupant_id;
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70 };