LoggingFilter4Logback.java

/*
 * Copyright 2006-2014 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.jrecruiter.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.security.core.context.SecurityContextHolder;

/**
 * Servlet Filter implementation class LoggingFilter4Logback
 *
 * @author Gunnar Hillert
 *
 */
public class LoggingFilter4Logback implements Filter {

	private final static Logger LOGGER = LoggerFactory.getLogger(LoggingFilter4Logback.class);

	public void destroy() {
	}

	public void doFilter(final ServletRequest req,
			final ServletResponse res,
			final FilterChain chain) throws IOException, ServletException {

		final HttpServletResponse response;
		final HttpServletRequest  request;

		if (res instanceof HttpServletResponse) {
			response = (HttpServletResponse) res;
		} else {
			throw new IllegalStateException("Cannot cast ServletResponse to HttpServletResponse.");
		}

		if (req instanceof HttpServletRequest) {
			request  = (HttpServletRequest) req;
		} else {
			throw new IllegalStateException("Cannot cast ServletRequest to HttpServletRequest.");
		}

		final ErrorAwareHttpServletResponseWrapper errorAwareResponse = new ErrorAwareHttpServletResponseWrapper(response);

		final String username;

		if (SecurityContextHolder.getContext() != null && SecurityContextHolder.getContext().getAuthentication() != null) {
			username = SecurityContextHolder.getContext().getAuthentication().getName();
		} else {
			username = null;
		}

		final String sessionId    = request.getSession().getId();
		final String requestUrl   = request.getRequestURL().toString();

		MDC.put("username",   username);
		MDC.put("sessionId",  sessionId);
		MDC.put("requestUrl", requestUrl);

		try {

			chain.doFilter(request, errorAwareResponse);

			if (HttpServletResponse.SC_NOT_FOUND == errorAwareResponse.getErrorCode()) {
				 LOGGER.error("Page '" + request.getServletPath() + "' was not found.");
			}


		} finally {
			MDC.remove("username");
			MDC.remove("sessionId");
			MDC.remove("requestUrl");

		}
	}

	public void init(FilterConfig arg0) throws ServletException {
	}

}