presto-main/src/main/java/io/prestosql/server/InternalAuthenticationManager.java/InternalAuthenticationManager/parseJwt
class InternalAuthenticationManager:    private static String parseJwt(byte[] hmac, String jwt)
    {
        return Jwts.parser()
                .setSigningKey(hmac)
                .parseClaimsJws(jwt)
                .getBody()
                .getSubject();
    }