annotate mod_muc_occupant_id/mod_muc_occupant_id.lua @ 5627:3a5cf8d80089

mod_http_oauth2: Tweak method of centering the UI The percentage here was relative to the viewport width, which on some very wide screens may put the UI slightly outside of the view, requiring scrolling to see. By using a unit relative to the height of the viewport, this is avoided and should work better. But no guarantees, it's still possible to resize the browser or adjust font sizes so that the UI goes out of view.
author Kim Alvefur <zash@zash.se>
date Mon, 31 Jul 2023 07:28:09 +0200
parents ae27f3359df8
children
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1
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2 -- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
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3 -- XEP-0421: Anonymous unique occupant identifiers for MUCs
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5 module:depends("muc");
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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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11 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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13 local function generate_id(occupant, room)
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14 local bare = occupant.bare_jid;
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16 if room._data.occupant_id_salt == nil then
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17 room._data.occupant_id_salt = uuid.generate();
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18 end
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20 -- XXX: Temporary not-so-important migration measure. Remove this next time
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21 -- somebody looks at it. This module used to store every participant's
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22 -- occupant-id all the time forever.
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23 room._data.occupant_ids = nil;
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25 return b64encode(hmac_sha256(bare, room._data.occupant_id_salt));
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26 end
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27
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28 local function update_occupant(event)
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29 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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31 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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32 if dest_occupant ~= nil then
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33 occupant = dest_occupant;
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34 end
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36 -- strip any existing <occupant-id/> tags to avoid forgery
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37 stanza:remove_children("occupant-id", xmlns_occupant_id);
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39 local unique_id = generate_id(occupant, room);
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40 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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41 end
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43 local function muc_private(event)
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44 local stanza, room = event.stanza, event.room;
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45 local occupant = room._occupants[stanza.attr.from];
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47 update_occupant({
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48 stanza = stanza,
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49 room = room,
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50 occupant = occupant,
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51 });
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52 end
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53
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54 module:add_feature(xmlns_occupant_id);
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55 module:hook("muc-disco#info", function (event)
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56 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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57 end);
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58
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59 module:hook("muc-broadcast-presence", update_occupant);
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60 module:hook("muc-occupant-pre-join", update_occupant);
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61 module:hook("muc-occupant-pre-change", update_occupant);
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62 module:hook("muc-occupant-groupchat", update_occupant);
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63 module:hook("muc-private-message", muc_private);