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 cm = require("core.configmanager");

local function format_host(host, conf)
	if host == "*" then
		return "Global"
	end
	local component_module = conf["component_module"];
	if type(component_module) == "string" then
		if component_module == "component" then
			return string.format("Component %q", host)
		else
			return string.format("Component %q %q", host, component_module)
		end
	else
		return string.format("VirtualHost %q", host)
	end
end

function module.command(arg)

	local config = cm.getconfig();

	print("digraph \"prosody\" {")
	for host, conf in pairs(config) do
		print(string.format("%q [label=%q]", host, format_host(host, conf)));
		local parent = host:match("%.(.*)");
		if parent and rawget(config, parent) then
			print(string.format("%q -> %q", parent, host));
		end
		local disco_items = conf["disco_items"]
		if type(disco_items) == "table" then
			for _, pair in ipairs(disco_items) do
				print(string.format("%q -> %q", host, pair[1]));
			end
		end

	end

	print("}")

	return 0
end