apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/oidc/PlaceholderPasswordEncoder.java/PlaceholderPasswordEncoder/encode
class PlaceholderPasswordEncoder:  @Override
  public String encode(CharSequence rawPassword) {
    byte[] bytes = new byte[32];
    ThreadLocalRandom.current().nextBytes(bytes);
    return Base64.getEncoder().encodeToString(bytes);
  }