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mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret

local bare_jid = require"util.jid".bare;
local st = require"util.stanza";

-- Support both old and new MUC code
local mod_muc = module:depends"muc";
local rooms = rawget(mod_muc, "rooms");
local get_room_from_jid = rawget(mod_muc, "get_room_from_jid") or
	function (jid)
		return rooms[jid];
	end

module:hook("message/full", function(event)
	local stanza, origin = event.stanza, event.origin;
	if stanza.attr.type == "error" then
		return
	end
	local to, from = stanza.attr.to, stanza.attr.from;
	local room = get_room_from_jid(bare_jid(to));
	local to_occupant = room and room._occupants[to];
	local from_occupant = room and room._occupants[room._jid_nick[from]]
	if not ( to_occupant and from_occupant ) then return end

	if from_occupant.affiliation then
		to_occupant._pm_block_override = true;
	elseif not from_occupant._pm_block_override then
		origin.send(st.error_reply(stanza, "cancel", "not-authorized", "Private messages are disabled"));
		return true;
	end
end, 1);