org.acegisecurity.providers.jaas.JaasNameCallbackHandler Maven / Gradle / Ivy

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/* Copyright 2004 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acegisecurity.providers.jaas;

import org.acegisecurity.Authentication;
import org.acegisecurity.userdetails.UserDetails;

import java.io.IOException;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.UnsupportedCallbackException;


/**
 * The most basic Callbacks to be handled when using a LoginContext from JAAS,
 * are the NameCallback and PasswordCallback. The acegi security framework
 * provides the JaasNameCallbackHandler specifically tailored to handling the
 * NameCallback. 

 *
 * @author Ray Krueger
 * @version $Id: JaasNameCallbackHandler.java,v 1.6 2005/11/29 13:10:08 benalex Exp $
 *
 * @see Callback
 * @see NameCallback
 */
public class JaasNameCallbackHandler
    implements JaasAuthenticationCallbackHandler {
    //~ Methods ================================================================

    /**
     * If the callback passed to the 'handle' method is an instance of
     * NameCallback, the JaasNameCallbackHandler will call,
     * callback.setName(authentication.getPrincipal().toString()).
     *
     * @param callback
     * @param authentication
     *
     * @throws IOException
     * @throws UnsupportedCallbackException
     */
    public void handle(Callback callback, Authentication authentication)
            throws IOException, UnsupportedCallbackException {

        if (callback instanceof NameCallback) {

            NameCallback ncb = (NameCallback) callback;
            String username = "";

            Object principal = authentication.getPrincipal();
            if (principal instanceof UserDetails) {
                username = ((UserDetails) principal).getUsername();
            } else {
                username = principal.toString();
            }

            ncb.setName(username);
        }
    }
}