/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.net.www.protocol.http;

import java.io.IOException;

import java.net.Authenticator;

import java.net.PasswordAuthentication;

import java.util.Arrays;

import javax.security.auth.callback.Callback;

import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.callback.NameCallback;

import javax.security.auth.callback.PasswordCallback;

import javax.security.auth.callback.UnsupportedCallbackException;

/**

 * @since 1.6

 */

public class NegotiateCallbackHandler implements CallbackHandler {

    private String username;

    private char[] password;

    public void handle(Callback[] callbacks) throws

            UnsupportedCallbackException, IOException {

        for (int i=0; i<callbacks.length; i++) {

            Callback callBack = callbacks[i];

            if (callBack instanceof NameCallback) {

                if (username == null) {

                    PasswordAuthentication passAuth =

                            Authenticator.requestPasswordAuthentication(

                    username = passAuth.getUserName();

                    password = passAuth.getPassword();

                }

                NameCallback nameCallback =

                        (NameCallback)callBack;

                nameCallback.setName(username);

            } else if (callBack instanceof PasswordCallback) {

                PasswordCallback passwordCallback =

                        (PasswordCallback)callBack;

                if (password == null) {

                    PasswordAuthentication passAuth =

                            Authenticator.requestPasswordAuthentication(

                    username = passAuth.getUserName();

                    password = passAuth.getPassword();

                }

                passwordCallback.setPassword(password);

                Arrays.fill(password, ' ');

            } else {

                throw new UnsupportedCallbackException(callBack,

                        "Call back not supported");

    }

}