prosody
03e9587fbfd2
plugins/muc/occupant_id.lib.lua

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plugins/muc/occupant_id.lib.lua @ 12053:03e9587fbfd2

mod_smacks: Switch storage for tracking resumption tokens All that was a complicated way to limit the number of resumable sessions. Let's control resource usage some other way. This leaves the essence of mapping resumption tokens to live sessions. This keeps resumption state across reloads.
author Kim Alvefur <zash@zash.se>
date Thu, 02 Dec 2021 14:41:19 +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 };