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 it = require "util.iterators";
local jid = require "util.jid";
local set = require "util.set";
local st = require "util.stanza";

local roles_store = module:open_store("roles", "map");
local config_admins = module:get_option_inherited_set("admins", {}) / jid.prep;

local function append_host(username)
	return username.."@"..module.host;
end

local function get_admins()
	local role_admins = roles_store:get_all("prosody:admin") or {};
	local admins = config_admins + (set.new(it.to_array(it.keys(role_admins))) / append_host);
	return admins;
end

function notify(text) --luacheck: ignore 131/notify
	local base_msg = st.message({ from = module.host })
		:text_tag("body", text);
	for admin_jid in get_admins() do
		local msg = st.clone(base_msg);
		msg.attr.to = admin_jid;
		module:send(msg);
	end
end