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}