DetectClientInfoUtil.java

package it.miriade.commons.web.utils;

import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

public class DetectClientInfoUtil {

	public static final String[] CLIENT_IP_HEADERS = { "X-FORWARDED-FOR", "VIA", "PROXY-CLIENT-IP", "WL-PROXY-CLIENT-IP", "HTTP_X_FORWARDED_FOR", "HTTP_X_FORWARDED", "HTTP_X_CLUSTER_CLIENT_IP", "HTTP_CLIENT_IP", "HTTP_FORWARDED_FOR",
		"HTTP_FORWARDED", "HTTP_VIA", "REMOTE_ADDR" };

	private static final Set<String> LOCALHOST_IPs = new HashSet<String>(Arrays.asList(new String[] { "0:0:0:0:0:0:0:1", "127.0.0.1" }));

	public static final String COOKIE_HEADER = "cookie";
	public static final String COOKIE_HEADER_JSESSIONID = "JSESSIONID";

	/**
	 * Ritorna IP address del client
	 * 
	 * @param request
	 * @return
	 */
	public static String getClientIpAddress(HttpServletRequest request) {
		String ip;
		for (String header : CLIENT_IP_HEADERS) {
			ip = request.getHeader(header);
			if (StringUtils.isNotBlank(ip) && !"unknown".equalsIgnoreCase(ip)) {
				return ip;
			}
		}
		ip = request.getRemoteAddr();
		if (LOCALHOST_IPs.contains(ip))
			ip = request.getServerName();
		return ip;
	}

	/**
	 * Ritorna un ID identificativo della sessione
	 * 
	 * @param request
	 * @return
	 */
	public static String getClientId(HttpServletRequest request) {

		String id = request.getRequestedSessionId();
		if (StringUtils.isNotBlank(id))
			return id;

		id = getCookieJSessionID(request);
		if (StringUtils.isNotBlank(id))
			return id;

		return "";
	}

	/**
	 * Ritorna un ID identificativo della sessione prendendolo dai cookies
	 * 
	 * @param request
	 * @return
	 */
	public static String getCookieJSessionID(HttpServletRequest request) {
		Enumeration<String> enumeration = request.getHeaderNames();
		while (enumeration.hasMoreElements()) {
			String temp = enumeration.nextElement();
			String header = request.getHeader(temp);
			if (COOKIE_HEADER.equalsIgnoreCase(temp))
				try {
					for (String cookie : header.split(";"))
						if (cookie.split("=")[0].trim().equalsIgnoreCase(COOKIE_HEADER_JSESSIONID))
							return cookie.split("=")[1];
				} catch (Exception e) {
				}
		}
		return "";
	}

}