/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.myfaces.tobago.internal.webapp;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.slf4j.MDC;
  
  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.HttpSession;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  
  public class LoggingMdcFilter implements Filter {
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
      if (LOG.isInfoEnabled()) {
        LOG.info("init " + getClass().getName());
      }
    }
  
    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
        throws IOException, ServletException {
  
      try {
        if (request instanceof HttpServletRequest) {
          final HttpServletRequest httpRequest = (HttpServletRequest) request;
          final HttpSession session = httpRequest.getSession(false);
          if (session != null) {
            MDC.put("sessionId", session.getId());
          }
          final String remoteAddr = httpRequest.getRemoteAddr();
          if (remoteAddr != null) {
            MDC.put("ip", remoteAddr);
          }
          final String remoteUser = httpRequest.getRemoteUser();
          if (remoteUser != null) {
            MDC.put("user", remoteUser);
          }
        }
  
        chain.doFilter(request, response);
  
      } finally {
        MDC.clear();
      }
    }
  
    @Override
    public void destroy() {
  
    }
  }