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package org.traccar.helper;
import javax.servlet.http.HttpServletRequest;
/**
* Gets the client's IP address regardless of whether the server is behind a proxy/reverse proxy server or a load balancer.
*
*/
public final class IpRetriever
{
/**
* Retrieves the client's IP address.
* Handles the cases like whether the server is behind a proxy/reverse proxy server or a load balancer
*
* @param request {@link HttpServletRequest} instance
* @return client's IP address
*/
public static String retrieveIP(HttpServletRequest request) {
if(request != null){
String ipAddress = request.getHeader("X-FORWARDED-FOR");
if (ipAddress != null && !ipAddress.isEmpty()) {
return removeUnwantedData(ipAddress);
}
else{
ipAddress = request.getRemoteAddr();
return ipAddress;
}
} else return null;
}
/**
* If the server is behind a reverse proxy, the header value will also contain the IP's from load balancer and reverse proxy
* This method gets rid of them.
*
* @param ipAddress IP address value from the header
* @return IP address of the client
*/
private static String removeUnwantedData(String ipAddress){
return ipAddress.contains(",") ? ipAddress.split(",")[0] : ipAddress;
}
}
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