/*

* Licensed to the Apache Software Foundation (ASF) under one or more

* contributor license agreements. See the NOTICE file distributed with

* this work for additional information regarding copyright ownership.

* The ASF licenses this file to You 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 org.apache.jasper.security;

import org.apache.jasper.Constants;

/**

* Util class for Security related operations.

*/

public final class SecurityUtil{

private static final boolean packageDefinitionEnabled =

System.getProperty("package.definition") == null ? false : true;

/**

* Return the <code>SecurityManager</code> only if Security is enabled AND

* package protection mechanism is enabled.

*/

public static boolean isPackageProtectionEnabled(){

if (packageDefinitionEnabled && Constants.IS_SECURITY_ENABLED){

return true;

}

return false;

}

/**

* 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);

StringBuilder result = new StringBuilder(content.length + 50);

for (int i = 0; i < content.length; i++) {

switch (content[i]) {

case '<':

result.append("&lt;");

break;

case '>':

result.append("&gt;");

break;

case '&':

result.append("&amp;");

break;

case '"':

result.append("&quot;");

break;

default:

result.append(content[i]);

}

}

return (result.toString());

}

}