/* 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.authentication.event;

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


/**
 * Outputs authentication-related application events to Commons Logging.
 * <p>
 * All authentication events are logged at the warning level.
 *
 * @author Ben Alex
 */
public class LoggerListener implements ApplicationListener<AbstractAuthenticationEvent> {
    //~ Static fields/initializers =====================================================================================

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

    /** If set to true, {@link InteractiveAuthenticationSuccessEvent} will be logged (defaults to true) */
    private boolean logInteractiveAuthenticationSuccessEvents = true;

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

    public void onApplicationEvent(AbstractAuthenticationEvent event) {
        if (!logInteractiveAuthenticationSuccessEvents && event instanceof InteractiveAuthenticationSuccessEvent) {
            return;
        }

        if (logger.isWarnEnabled()) {
            final StringBuilder builder = new StringBuilder();
            builder.append("Authentication event ");
            builder.append(ClassUtils.getShortName(event.getClass()));
            builder.append(": ");
            builder.append(event.getAuthentication().getName());
            builder.append("; details: ");
            builder.append(event.getAuthentication().getDetails());

            if (event instanceof AbstractAuthenticationFailureEvent) {
                builder.append("; exception: ");
                builder.append(((AbstractAuthenticationFailureEvent) event).getException().getMessage());
            }

            logger.warn(builder.toString());
        }
    }

    public boolean isLogInteractiveAuthenticationSuccessEvents() {
        return logInteractiveAuthenticationSuccessEvents;
    }

    public void setLogInteractiveAuthenticationSuccessEvents(
            boolean logInteractiveAuthenticationSuccessEvents) {
        this.logInteractiveAuthenticationSuccessEvents = logInteractiveAuthenticationSuccessEvents;
    }
}
