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!

-- mod_statistics_auth
module:set_global();

local auth_ok, auth_fail = 0, 0

function module.add_host(module)
	module:hook("authentication-success", function(event)
		auth_ok = auth_ok + 1
	end);
	module:hook("authentication-failure", function(event)
		auth_fail = auth_fail + 1
	end);
end

module:provides("statistics", {
	statistics = {
		c2s_auth = {
			get = function ()
				return auth_ok;
			end;
			tostring = tostring;
		};
		c2s_authfail = {
			get = function ()
				return auth_fail;
			end;
			tostring = tostring;
		};
	}
});