1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
-- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
-- XEP-0421: Anonymous unique occupant identifiers for MUCs
-- (C) 2020 Maxime “pep” Buquet <pep@bouah.net>
-- (C) 2020 Matthew Wild <mwild1@gmail.com>
local uuid = require "util.uuid";
local hmac_sha256 = require "util.hashes".hmac_sha256;
local b64encode = require "util.encodings".base64.encode;
local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
local function get_room_salt(room)
local salt = room._data.occupant_id_salt;
if not salt then
salt = uuid.generate();
room._data.occupant_id_salt = salt;
end
return salt;
end
local function get_occupant_id(room, occupant)
if occupant.stable_id then
return occupant.stable_id;
end
local salt = get_room_salt(room)
occupant.stable_id = b64encode(hmac_sha256(occupant.bare_jid, salt));
return occupant.stable_id;
end
local function update_occupant(event)
local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
-- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
if dest_occupant ~= nil then
occupant = dest_occupant;
end
-- strip any existing <occupant-id/> tags to avoid forgery
stanza:remove_children("occupant-id", xmlns_occupant_id);
local unique_id = get_occupant_id(room, occupant);
stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
end
local function muc_private(event)
local stanza, room = event.stanza, event.room;
local occupant = room._occupants[stanza.attr.from];
update_occupant({
stanza = stanza,
room = room,
occupant = occupant,
});
end
if module:get_option_boolean("muc_occupant_id", true) then
module:add_feature(xmlns_occupant_id);
module:hook("muc-disco#info", function (event)
event.reply:tag("feature", { var = xmlns_occupant_id }):up();
end);
module:hook("muc-broadcast-presence", update_occupant);
module:hook("muc-occupant-pre-join", update_occupant);
module:hook("muc-occupant-pre-change", update_occupant);
module:hook("muc-occupant-groupchat", update_occupant);
module:hook("muc-private-message", muc_private);
end
return {
get_room_salt = get_room_salt;
get_occupant_id = get_occupant_id;
};
|
