prosody
9c4dc1e6d2c9
plugins/muc/occupant_id.lib.lua

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plugins/muc/occupant_id.lib.lua @ 13107:9c4dc1e6d2c9

mod_http: Add way to retrieve internal URL instead of external This could be of help when configuring reverse proxies, as it is the internal URL the proxy must point at. Argument treated as an enum "internal" "external"(default) to allow for future extensibility.
author Kim Alvefur <zash@zash.se>
date Wed, 24 May 2023 14:43:45 +0200
parent 12977:74b9e05af71e
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rev   line source
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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 "prosody.util.uuid";
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8 local hmac_sha256 = require "prosody.util.hashes".hmac_sha256;
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9 local b64encode = require "prosody.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_room_salt(room)
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14 local salt = room._data.occupant_id_salt;
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15 if not salt then
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16 salt = uuid.generate();
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17 room._data.occupant_id_salt = salt;
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18 end
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19 return salt;
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20 end
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21
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22 local function get_occupant_id(room, occupant)
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23 if occupant.stable_id then
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24 return occupant.stable_id;
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25 end
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26
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27 local salt = get_room_salt(room)
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28
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29 occupant.stable_id = b64encode(hmac_sha256(occupant.bare_jid, salt));
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30
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31 return occupant.stable_id;
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32 end
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33
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34 local function update_occupant(event)
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35 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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36
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37 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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38 if dest_occupant ~= nil then
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39 occupant = dest_occupant;
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40 end
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41
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42 -- strip any existing <occupant-id/> tags to avoid forgery
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43 stanza:remove_children("occupant-id", xmlns_occupant_id);
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44
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45 local unique_id = get_occupant_id(room, occupant);
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46 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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47 end
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48
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49 local function muc_private(event)
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50 local stanza, room = event.stanza, event.room;
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51 local occupant = room._occupants[stanza.attr.from];
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52
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53 update_occupant({
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54 stanza = stanza,
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55 room = room,
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56 occupant = occupant,
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57 });
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58 end
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59
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60 if module:get_option_boolean("muc_occupant_id", true) then
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61 module:add_feature(xmlns_occupant_id);
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62 module:hook("muc-disco#info", function (event)
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63 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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64 end);
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65
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66 module:hook("muc-broadcast-presence", update_occupant);
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67 module:hook("muc-occupant-pre-join", update_occupant);
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68 module:hook("muc-occupant-pre-change", update_occupant);
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69 module:hook("muc-occupant-groupchat", update_occupant);
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70 module:hook("muc-private-message", muc_private);
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71 end
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72
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73 return {
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74 get_room_salt = get_room_salt;
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75 get_occupant_id = get_occupant_id;
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76 };