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76 lines
2.2 KiB
76 lines
2.2 KiB
-- Implementation of https://xmpp.org/extensions/xep-0421.html
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-- XEP-0421: Anonymous unique occupant identifiers for MUCs
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-- (C) 2020 Maxime “pep” Buquet <pep@bouah.net>
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-- (C) 2020 Matthew Wild <mwild1@gmail.com>
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local uuid = require "prosody.util.uuid";
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local hmac_sha256 = require "prosody.util.hashes".hmac_sha256;
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local b64encode = require "prosody.util.encodings".base64.encode;
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local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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local function get_room_salt(room)
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local salt = room._data.occupant_id_salt;
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if not salt then
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salt = uuid.generate();
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room._data.occupant_id_salt = salt;
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end
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return salt;
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end
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local function get_occupant_id(room, occupant)
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if occupant.stable_id then
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return occupant.stable_id;
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end
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local salt = get_room_salt(room)
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occupant.stable_id = b64encode(hmac_sha256(occupant.bare_jid, salt));
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return occupant.stable_id;
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end
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local function update_occupant(event)
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local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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-- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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if dest_occupant ~= nil then
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occupant = dest_occupant;
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end
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-- strip any existing <occupant-id/> tags to avoid forgery
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stanza:remove_children("occupant-id", xmlns_occupant_id);
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local unique_id = get_occupant_id(room, occupant);
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stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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end
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local function muc_private(event)
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local stanza, room = event.stanza, event.room;
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local occupant = room._occupants[stanza.attr.from];
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update_occupant({
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stanza = stanza,
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room = room,
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occupant = occupant,
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});
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end
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if module:get_option_boolean("muc_occupant_id", true) then
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module:add_feature(xmlns_occupant_id);
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module:hook("muc-disco#info", function (event)
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event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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end);
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module:hook("muc-broadcast-presence", update_occupant);
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module:hook("muc-occupant-pre-join", update_occupant);
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module:hook("muc-occupant-pre-change", update_occupant);
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module:hook("muc-occupant-groupchat", update_occupant);
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module:hook("muc-private-message", muc_private);
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end
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return {
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get_room_salt = get_room_salt;
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get_occupant_id = get_occupant_id;
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};
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