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annotate plugins/muc/occupant_id.lib.lua @ 13946:f5e8ab42c708

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mod_http_file_share: Check that files are still there with correct size Failed uploads can leave behind unused slots. Files shouldn't change size after they have been successfully uploaded, but might as well double check it.
author Kim Alvefur <zash@zash.se>
date Sat, 04 Dec 2021 18:56:51 +0100
parents 0e346f4d88ce
children
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a45b209302c1 muc: Update link to XEP-0421 (instead of inbox)
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1 -- Implementation of https://xmpp.org/extensions/xep-0421.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 get_occupant_id_from_jid(room, real_bare_jid)
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35 local salt = get_room_salt(room)
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36 return b64encode(hmac_sha256(real_bare_jid, salt));
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37 end
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38
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39 local function update_occupant(event)
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40 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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41
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42 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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43 if dest_occupant ~= nil then
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44 occupant = dest_occupant;
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45 end
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46
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47 -- strip any existing <occupant-id/> tags to avoid forgery
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48 stanza:remove_children("occupant-id", xmlns_occupant_id);
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49
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50 local unique_id = get_occupant_id(room, occupant);
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51 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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52 end
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53
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54 local function muc_private(event)
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55 local stanza, room = event.stanza, event.room;
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56 local occupant = room._occupants[stanza.attr.from];
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57
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58 update_occupant({
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59 stanza = stanza,
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60 room = room,
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61 occupant = occupant,
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62 });
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63 end
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64
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65 if module:get_option_boolean("muc_occupant_id", true) then
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66 module:add_feature(xmlns_occupant_id);
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67 module:hook("muc-disco#info", function (event)
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68 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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69 end);
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70
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71 module:hook("muc-broadcast-presence", update_occupant);
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72 module:hook("muc-occupant-pre-join", update_occupant);
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73 module:hook("muc-occupant-pre-change", update_occupant);
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74 module:hook("muc-occupant-groupchat", update_occupant);
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75 module:hook("muc-private-message", muc_private);
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76 end
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78 return {
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79 get_room_salt = get_room_salt;
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80 get_occupant_id = get_occupant_id;
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81 get_occupant_id_from_jid = get_occupant_id_from_jid;
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82 };