001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.servlet.filters.validhostname;
016    
017    import com.liferay.portal.kernel.servlet.TryFilter;
018    import com.liferay.portal.kernel.util.Validator;
019    import com.liferay.portal.servlet.filters.BasePortalFilter;
020    
021    import javax.servlet.http.HttpServletRequest;
022    import javax.servlet.http.HttpServletResponse;
023    
024    /**
025     * @author Shuyang Zhou
026     */
027    public class ValidHostNameFilter extends BasePortalFilter implements TryFilter {
028    
029            public Object doFilterTry(
030                            HttpServletRequest request, HttpServletResponse response)
031                    throws Exception {
032    
033                    String serverName = request.getServerName();
034    
035                    if (!Validator.isHostName(serverName)) {
036                            throw new RuntimeException("Invalid host name " + serverName);
037                    }
038    
039                    return null;
040            }
041    
042    }