/*
 * Copyright 2004, 2005, 2006 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.springframework.security.access.event;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationListener;

/**
 * Outputs interceptor-related application events to Commons Logging.
 * <p>
 * All failures are logged at the warning level, with success events logged at the
 * information level, and public invocation events logged at the debug level.
 * </p>
 *
 * @author Ben Alex
 */
public class LoggerListener implements ApplicationListener<AbstractAuthorizationEvent> {
	// ~ Static fields/initializers
	// =====================================================================================

	private static final Log logger = LogFactory.getLog(LoggerListener.class);

	// ~ Methods
	// ========================================================================================================

	public void onApplicationEvent(AbstractAuthorizationEvent event) {
		if (event instanceof AuthenticationCredentialsNotFoundEvent) {
			AuthenticationCredentialsNotFoundEvent authEvent = (AuthenticationCredentialsNotFoundEvent) event;

			if (logger.isWarnEnabled()) {
				logger.warn("Security interception failed due to: "
						+ authEvent.getCredentialsNotFoundException()
						+ "; secure object: " + authEvent.getSource()
						+ "; configuration attributes: "
						+ authEvent.getConfigAttributes());
			}
		}

		if (event instanceof AuthorizationFailureEvent) {
			AuthorizationFailureEvent authEvent = (AuthorizationFailureEvent) event;

			if (logger.isWarnEnabled()) {
				logger.warn("Security authorization failed due to: "
						+ authEvent.getAccessDeniedException()
						+ "; authenticated principal: " + authEvent.getAuthentication()
						+ "; secure object: " + authEvent.getSource()
						+ "; configuration attributes: "
						+ authEvent.getConfigAttributes());
			}
		}

		if (event instanceof AuthorizedEvent) {
			AuthorizedEvent authEvent = (AuthorizedEvent) event;

			if (logger.isInfoEnabled()) {
				logger.info("Security authorized for authenticated principal: "
						+ authEvent.getAuthentication() + "; secure object: "
						+ authEvent.getSource() + "; configuration attributes: "
						+ authEvent.getConfigAttributes());
			}
		}

		if (event instanceof PublicInvocationEvent) {
			PublicInvocationEvent authEvent = (PublicInvocationEvent) event;

			if (logger.isInfoEnabled()) {
				logger.info("Security interception not required for public secure object: "
						+ authEvent.getSource());
			}
		}
	}
}
