package com.jspservletcookbook;  

import javax.security.auth.callback.*;
import javax.servlet.ServletRequest;

public class WebCallbackHandler implements CallbackHandler {

    private String userName;
    private String password;
    
    public WebCallbackHandler(ServletRequest request){
    
        userName = request.getParameter("userName");
        password = request.getParameter("password");
        
    }
    
    public void handle(Callback[] callbacks) throws java.io.IOException,
      UnsupportedCallbackException {
				   
		for (int i = 0; i < callbacks.length; i++){
         
            if (callbacks[i] instanceof NameCallback){
            
                NameCallback nameCall = (NameCallback) callbacks[i];
                nameCall.setName(userName);
            
            } else if (callbacks[i] instanceof PasswordCallback){
            
                PasswordCallback passCall = (PasswordCallback) callbacks[i];
                passCall.setPassword(password.toCharArray());
            
            } else{
            
                throw new UnsupportedCallbackException (callbacks[i],
                  "The CallBacks are unrecognized in class: "+getClass().getName());
            
            }
        
        }//for
    }//handle
    
}