package edu.yale.its.tp.cas.auth.provider;

import javax.security.auth.callback.*;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * Callback Handler that is used with the KerberosAuthHandler.
 * This Callback Handler is based on the SampleCallbackHandler from Sun.
 * 
 * Two methods are added to this callback handler which allows the 
 * KerberosAuthHandler to pass the username and password received from
 * the CAS Login page.
 *
 */
public class CASCallbackHandler implements CallbackHandler 
{
    
    private String CASUserId;
    private char [] CASPassword;
    
    public void handle(Callback[] callbacks) 
	throws java.io.IOException, UnsupportedCallbackException {
	for (int i = 0; i < callbacks.length; i++) {
	    if (callbacks[i] instanceof NameCallback) {
		NameCallback cb = (NameCallback)callbacks[i];
		cb.setName(CASUserId);
		
	    } else if (callbacks[i] instanceof PasswordCallback) {
		PasswordCallback cb = (PasswordCallback)callbacks[i];
		cb.setPassword(CASPassword);
		
	    } else {
		throw new UnsupportedCallbackException(callbacks[i]);
	    }
	}
    }
    
    public void setUserId(String userid)
    {
	CASUserId = userid;
    }
    
    public void setPassword(String password)
    {
	CASPassword = password.toCharArray();
    }
}