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annotate mod_muc_occupant_id/mod_muc_occupant_id.lua @ 3834:2f189f022b84

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mod_muc_occupant_id: Simplify handling of occupants (all into one function)
author Maxime “pep” Buquet <pep@bouah.net>
date Sat, 04 Jan 2020 19:47:55 +0100
parents 435f5b4ebd06
children 5258f0afa8b4
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1
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d6164ae6179c mod_muc_occupant_id: Update links to the XEP inbox.
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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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83a68f5fde1d mod_muc_occupant_id: depend on muc.
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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 if room._data.occupant_ids == nil then
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21 room._data.occupant_ids = {};
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22 end
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24 if room._data.occupant_ids[bare] == nil then
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25 local unique_id = b64encode(hmac_sha256(bare, room._data.occupant_id_salt));
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26 room._data.occupant_ids[bare] = unique_id;
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27 end
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29 return room._data.occupant_ids[bare];
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30 end
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32 local function update_occupant(event)
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33 local stanza, occupant, room = event.stanza, event.occupant, event.room;
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35 -- strip any existing <occupant-id/> tags to avoid forgery
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36 stanza:remove_children("occupant-id", xmlns_occupant_id);
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38 local unique_id = generate_id(occupant, room);
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39 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id })
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40 :text(unique_id)
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41 :up();
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42 end
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44 module:add_feature(xmlns_occupant_id);
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45 module:hook("muc-disco#info", function (event)
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46 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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47 end);
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49 module:hook("muc-occupant-pre-join", update_occupant);
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50 module:hook("muc-occupant-groupchat", update_occupant);