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

module:set_global();

local measure = require"core.statsmanager".measure;

local counters = {
	unknown = measure("amount", "client_identities.unknown"),
};

module:hook("stats-update", function ()
	local buckets = {
		unknown = 0,
	};
	for _, session in pairs(prosody.full_sessions) do
		if session.caps_cache ~= nil then
			local node_string = session.caps_cache.attr.node;
			local node = node_string:match("([^#]+)");
			if buckets[node] == nil then
				buckets[node] = 0;
			end
			buckets[node] = buckets[node] + 1;
		else
			buckets.unknown = buckets.unknown + 1;
		end
	end
	local visited = {};
	for bucket, count in pairs(buckets) do
		if counters[bucket] == nil then
			counters[bucket] = measure("amount", "client_identities."..bucket);
		end
		counters[bucket](count);
		visited[bucket] = true;
	end
	for bucket, counter in pairs(counters) do
		if not visited[bucket] then
			counter(0);
		end
	end
end)