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The source code/* * $Header: /home/cvs/jakarta-tomcat/src/examples/WEB-INF/classes/util/HTMLFilter.java,v 1.2 2004/02/22 22:57:59 billbarker Exp $ * $Revision: 1.2 $ * $Date: 2004/02/22 22:57:59 $ * * * Copyright 1999-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package util; /** * HTML filter utility. * * @author Craig R. McClanahan * @author Tim Tye * @version $Revision: 1.2 $ */ public final class HTMLFilter { /** * Filter the specified message string for characters that are sensitive * in HTML. This avoids potential attacks caused by including JavaScript * codes in the request URL that is often reported in error messages. * * @param message The message string to be filtered */ public static String filter(String message) { if (message == null) return (null); char content[] = new char[message.length()]; message.getChars(0, message.length(), content, 0); StringBuffer result = new StringBuffer(content.length + 50); for (int i = 0; i < content.length; i++) { switch (content[i]) { case '<': result.append("<"); break; case '>': result.append(">"); break; case '&': result.append("&"); break; case '"': result.append("""); break; default: result.append(content[i]); } } return (result.toString()); } } |
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