/*
 * Copyright 2005-2014 the original author or authors.
 *
 * 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.springframework.ws.soap.security.xwss.callback;

import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.UnsupportedCallbackException;

import com.sun.xml.wss.impl.callback.PasswordCallback;
import com.sun.xml.wss.impl.callback.UsernameCallback;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import org.springframework.ws.soap.security.callback.AbstractCallbackHandler;

/**
 * Simple callback handler that supplies a username and password to a username token at runtime.
 *
 * <p>This class handles {@code UsernameCallback}s and {@code PasswordCallback}s, and throws an
 * {@code UnsupportedCallbackException} for others
 *
 * @author Arjen Poutsma
 * @see #setUsername(String)
 * @see #setPassword(String)
 * @since 1.0.0
 */
public class SimpleUsernamePasswordCallbackHandler extends AbstractCallbackHandler implements InitializingBean {

	private String username;

	private String password;


	/**
	 * Constructs an empty instance of the {@code SimpleUsernamePasswordCallbackHandler}.
	 */
	public SimpleUsernamePasswordCallbackHandler() {
	}

	/**
	 * Constructs an instance of the {@code SimpleUsernamePasswordCallbackHandler} with the given name and password.
	 */
	public SimpleUsernamePasswordCallbackHandler(String username, String password) {
		this.username = username;
		this.password = password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		Assert.hasLength(username, "username must be set");
		Assert.hasLength(password, "password must be set");
	}

	@Override
	protected void handleInternal(Callback callback) throws IOException, UnsupportedCallbackException {
		if (callback instanceof UsernameCallback) {
			UsernameCallback usernameCallback = (UsernameCallback) callback;
			usernameCallback.setUsername(username);
		}
		else if (callback instanceof PasswordCallback) {
			PasswordCallback passwordCallback = (PasswordCallback) callback;
			passwordCallback.setPassword(password);
		}
		else {
			throw new UnsupportedCallbackException(callback);
		}
	}
}