Implementing session timeout in playframework

According to play documentation "There is no technical timeout for the Session. It expires when the user closes the web browser. If you need a functional timeout for a specific application, just store a timestamp into the user Session and use it however your application needs (e.g. for a maximum session duration, maximum inactivity duration, etc.)."

So I used the following way to implement a session timeout. Following custom authenticator class was used to implement this.

  public class ValidateUserSessionAction extends Security.Authenticator{

    @Override
    public String getUsername(Http.Context ctx) {
        long currentTime=System.currentTimeMillis();
        long timeOut=Long.parseLong(Play.application().configuration().getString("sessionTimeout")) * 1000 * 60;
        String temp=ctx.session().get(Constants.LAST_SEEN_KEY);
        if (temp == null) {
            temp = String.valueOf(currentTime);
        }
        if((currentTime-Long.parseLong(temp))<timeOut) {
            //If multiple instances are running, time should be synchronized between nodes
            ctx.session().put(Constants.LAST_SEEN_KEY, String.valueOf(System.currentTimeMillis()));
            return ctx.session().get(Constants.SESSION_USER_KEY);
        }else{
            ctx.session().clear();
            return null;
        }
    }

    @Override
    public Result onUnauthorized(Http.Context ctx) {
        return redirect(controllers.routes.UserController.signIn());
    }

    
}

Above authenticator class can be used to validate user actions like below.
 
 @Security.Authenticated(ValidateUserSessionAction.class)
    public static F.Promise<result< updateEmail() {
        //do something
        return ok();
    }

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