97 lines
3.5 KiB
Java
97 lines
3.5 KiB
Java
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/*
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* Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.action;
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import java.security.AccessController;
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/**
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* A convenience class for retrieving the boolean value of a system property
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* as a privileged action.
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*
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* <p>An instance of this class can be used as the argument of
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* <code>AccessController.doPrivileged</code>.
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*
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* <p>The following code retrieves the boolean value of the system
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* property named <code>"prop"</code> as a privileged action:
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*
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* <pre>
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* boolean b = java.security.AccessController.doPrivileged
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* (new GetBooleanAction("prop")).booleanValue();
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* </pre>
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*
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* @author Roland Schemers
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* @see java.security.PrivilegedAction
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* @see java.security.AccessController
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* @since 1.2
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*/
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public class GetBooleanAction
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implements java.security.PrivilegedAction<Boolean> {
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private String theProp;
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/**
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* Constructor that takes the name of the system property whose boolean
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* value needs to be determined.
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*
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* @param theProp the name of the system property.
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*/
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public GetBooleanAction(String theProp) {
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this.theProp = theProp;
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}
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/**
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* Determines the boolean value of the system property whose name was
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* specified in the constructor.
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*
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* @return the <code>Boolean</code> value of the system property.
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*/
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public Boolean run() {
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return Boolean.getBoolean(theProp);
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}
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/**
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* Convenience method to get a property without going through doPrivileged
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* if no security manager is present. This is unsafe for inclusion in a
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* public API but allowable here since this class is now encapsulated.
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*
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* Note that this method performs a privileged action using caller-provided
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* inputs. The caller of this method should take care to ensure that the
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* inputs are not tainted and the returned property is not made accessible
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* to untrusted code if it contains sensitive information.
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*
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* @param theProp the name of the system property.
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*/
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@SuppressWarnings("removal")
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public static boolean privilegedGetProperty(String theProp) {
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if (System.getSecurityManager() == null) {
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return Boolean.getBoolean(theProp);
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} else {
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return AccessController.doPrivileged(
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new GetBooleanAction(theProp));
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}
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}
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}
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