/*
 * Copyright 2005-2010 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.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.ws.soap.security.callback.AbstractCallbackHandler;

/**
 * Callback handler that adds username/password information to a mesage using an Spring Security {@link
 * org.springframework.security.core.context.SecurityContext}.
 *
 * <p>This class handles {@code UsernameCallback}s and {@code PasswordCallback}s, and throws an
 * {@code UnsupportedCallbackException} for others
 *
 * @author Arjen Poutsma
 * @since 1.5.0
 */
public class SpringUsernamePasswordCallbackHandler extends AbstractCallbackHandler {

	@Override
	protected void handleInternal(Callback callback) throws IOException, UnsupportedCallbackException {
		if (callback instanceof UsernameCallback) {
			Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
			if (authentication != null && authentication.getName() != null) {
				UsernameCallback usernameCallback = (UsernameCallback) callback;
				usernameCallback.setUsername(authentication.getName());
				return;
			}
			else {
				logger.warn(
						"Cannot handle UsernameCallback: Spring Security SecurityContext contains no Authentication");
			}
		}
		else if (callback instanceof PasswordCallback) {
			Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
			if (authentication != null && authentication.getName() != null) {
				PasswordCallback passwordCallback = (PasswordCallback) callback;
				passwordCallback.setPassword(authentication.getCredentials().toString());
				return;
			}
			else {
				logger.warn(
						"Canot handle PasswordCallback: Spring Security SecurityContext contains no Authentication");
			}
		}
		throw new UnsupportedCallbackException(callback);
	}
}