001/* 002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * matic 018 */ 019package org.nuxeo.ecm.platform.web.common.requestcontroller.filter; 020 021import java.util.Arrays; 022import java.util.List; 023 024import javax.servlet.http.HttpServletRequest; 025 026/** 027 * @author matic 028 */ 029public class RemoteHostGuessExtractor { 030 031 static final List<String> HEADER_NAMES = Arrays.asList("x-forwarded-for", "x-forwarded", "forwarded-for", "via", 032 "x-coming-from", "coming-from"); 033 034 public static String getRemoteHost(HttpServletRequest request) { 035 for (String name : HEADER_NAMES) { 036 String value = request.getHeader(name); 037 if (value != null) { 038 return value; 039 } 040 } 041 return request.getRemoteAddr(); 042 } 043 044}