mod_http_oauth2: Advertise the currently supported id_token signing algorithm This field is REQUIRED. The algorithm RS256 MUST be included, but isn't because we don't implement it, as that would require implementing a pile of additional cryptography and JWT stuff. Instead the id_token is signed using the client secret, which allows verification by the client, since it's a shared secret per OpenID Connect Core 1.0 § 10.1 under Symmetric Signatures. OpenID Connect Discovery 1.0 has a lot of REQUIRED and MUST clauses that are not supported here, but that's okay because this is served from the RFC 8414 OAuth 2.0 Authorization Server Metadata .well-known endpoint!

module:set_global();

local traceback = require "util.debug".traceback;

require"util.signal".signal(module:get_option_string(module.name, "SIGUSR1"), function ()
	module:log("info", "Received SIGUSR1, writing traceback");
	local f = io.open(prosody.paths.data.."/traceback.txt", "a+");
	f:write(traceback(), "\n");
	f:close();
end);