Real client ip - jersey request filter

ClientIpFilter.java

package com.monitoringvn.utils.rest.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.PreMatching;
import javax.ws.rs.core.Context;
import java.io.IOException;

/**
 * Created by loind on 12/9/2015.
 */
@PreMatching
public class ClientIpFilter implements ContainerRequestFilter {


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

    @Context
    HttpServletRequest httpServletRequest;

    @Override
    public void filter(ContainerRequestContext request) throws IOException {
        String client_ip = httpServletRequest.getHeader("x-real-ip");
        if(client_ip == null || client_ip.isEmpty()){ // extract from forward ips
            String ipForwarded = httpServletRequest.getHeader("x-forwarded-for");
            String[] ips = ipForwarded == null ? null: ipForwarded.split(",") ;
            client_ip = ( ips == null || ips.length == 0 )? null : ips[0];

            // extract from remote addr
            client_ip = ( client_ip == null || client_ip.isEmpty() ) ? httpServletRequest.getRemoteAddr() : client_ip;
        }
        LOGGER.trace("Real Ip[{}]",client_ip);
        request.getHeaders().putSingle("client_ip",client_ip);
    }

}