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The source code/* * $Header: /cvsroot/mvnforum/myvietnam/src/net/myvietnam/mvncore/filter/UserAgentFilter.java,v 1.6 2005/01/26 04:54:40 minhnn Exp $ * $Author: minhnn $ * $Revision: 1.6 $ * $Date: 2005/01/26 04:54:40 $ * * ==================================================================== * * Copyright (C) 2002-2005 by MyVietnam.net * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or any later version. * * All copyright notices regarding MyVietnam and MyVietnam CoreLib * MUST remain intact in the scripts and source code. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Correspondence and Marketing Questions can be sent to: * info@MyVietnam.net * * @author: Minh Nguyen minhnn@MyVietnam.net * @author: Mai Nguyen mai.nh@MyVietnam.net */ package net.myvietnam.mvncore.filter; import javax.servlet.http.HttpServletRequest; import net.myvietnam.mvncore.MVNCoreConfig; import net.myvietnam.mvncore.util.StringUtil; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public final class UserAgentFilter { private static Log log = LogFactory.getLog(UserAgentFilter.class); private static String[] blockedUserAgent = null; private UserAgentFilter() { //prevent instantiation } static { //UserAgentOptions UserAgentOptions = new UserAgentOptions(); //blockedUserAgent = StringUtil.getStringArray(UserAgentOptions.blockedUserAgent, ";"); blockedUserAgent = StringUtil.getStringArray(MVNCoreConfig.getBlockedUserAgents(), ";"); } /** * Filter the UserAgent * @param request * @return true if the UserAgent in this request is ok * false if the UserAgent in this request is blocked */ public static boolean filter(HttpServletRequest request) { if (request == null) { throw new NullPointerException("Cannot accept a null request in UserAgentFilter"); } String checkUserAgent = request.getHeader("User-Agent"); //@todo: in this case, should we return true or false ? if (checkUserAgent == null) return true; for (int i = 0; i < blockedUserAgent.length; i++) { String currentBlockedUserAgent = blockedUserAgent[i]; if (checkUserAgent.indexOf(currentBlockedUserAgent) != -1) { return false; } } return true; } } |
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