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mod_muc_occupant_id/mod_muc_occupant_id.lua @ 3803:dc2b5a412286
mod_rest: Log sent and received stanzas in style of mod_c2s etc
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 01 Jan 2020 05:36:09 +0100 |
parent | 3775:d60efdb947fd |
child | 3829:f20a5d28910f |
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-- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html -- XEP-0421: Anonymous unique occupant identifiers for MUCs module:depends("muc"); 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 edit_occupant(event) local occupant, room = event.occupant, event.room; local bare = occupant.bare_jid; -- TODO: Move the salt on the MUC component. Setting the salt on the room -- can be problematic when the room is destroyed. Next time it's recreated -- the salt will be different and so will be the unique_id. Or maybe we want -- this anyway? if room._data.occupant_id_salt == nil then local salt = uuid.generate(); room._data.occupant_id_salt = salt; end local unique_id = b64encode(hmac_sha256(bare, room._data.occupant_id_salt)); -- TODO: Store this only once per bare jid and not once per occupant? local stanza = event.stanza; stanza:tag("occupant-id", { xmlns = xmlns_occupant_id }) :text(unique_id) :up(); end local function handle_stanza(event) local stanza, occupant = event.stanza, event.occupant; -- TODO: Handle MAM. -- strip any existing <occupant-id/> tags to avoid forgery stanza:remove_children("occupant-id", xmlns_occupant_id); local unique_id = occupant.sessions[stanza.attr.from] :get_child("occupant-id", xmlns_occupant_id) :get_text(); stanza:tag("occupant-id", { xmlns = xmlns_occupant_id }) :text(unique_id) :up(); end 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-occupant-pre-join", edit_occupant); module:hook("muc-occupant-groupchat", handle_stanza);