001/*
002 * (C) Copyright 2006-2008 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     matic
016 */
017package org.nuxeo.ecm.platform.web.common.requestcontroller.filter;
018
019import java.util.Arrays;
020import java.util.List;
021
022import javax.servlet.http.HttpServletRequest;
023
024/**
025 * @author matic
026 */
027public class RemoteHostGuessExtractor {
028
029    static final List<String> HEADER_NAMES = Arrays.asList("x-forwarded-for", "x-forwarded", "forwarded-for", "via",
030            "x-coming-from", "coming-from");
031
032    public static String getRemoteHost(HttpServletRequest request) {
033        for (String name : HEADER_NAMES) {
034            String value = request.getHeader(name);
035            if (value != null) {
036                return value;
037            }
038        }
039        return request.getRemoteAddr();
040    }
041
042}