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/*
* Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.nio.file;
import java.security.BasicPermission;
/**
* The {@code Permission} class for link creation operations.
*
* <p> The following table provides a summary description of what the permission
* allows, and discusses the risks of granting code the permission.
*
* <table border=1 cellpadding=5
* summary="Table shows permission target name, what the permission allows, and associated risks">
* <tr>
* <th>Permission Target Name</th>
* <th>What the Permission Allows</th>
* <th>Risks of Allowing this Permission</th>
* </tr>
* <tr>
* <td>hard</td>
* <td> Ability to add an existing file to a directory. This is sometimes
* known as creating a link, or hard link. </td>
* <td> Extreme care should be taken when granting this permission. It allows
* linking to any file or directory in the file system thus allowing the
* attacker access to all files. </td>
* </tr>
* <tr>
* <td>symbolic</td>
* <td> Ability to create symbolic links. </td>
* <td> Extreme care should be taken when granting this permission. It allows
* linking to any file or directory in the file system thus allowing the
* attacker to access to all files. </td>
* </tr>
* </table>
*
* @since 1.7
*
* @see Files#createLink
* @see Files#createSymbolicLink
*/
public final class LinkPermission extends BasicPermission {
static final long serialVersionUID = -1441492453772213220L;
private void checkName(String name) {
if (!name.equals("hard") && !name.equals("symbolic")) {
throw new IllegalArgumentException("name: " + name);
}
}
/**
* Constructs a {@code LinkPermission} with the specified name.
*
* @param name
* the name of the permission. It must be "hard" or "symbolic".
*
* @throws IllegalArgumentException
* if name is empty or invalid
*/
public LinkPermission(String name) {
super(name);
checkName(name);
}
/**
* Constructs a {@code LinkPermission} with the specified name.
*
* @param name
* the name of the permission; must be "hard" or "symbolic".
* @param actions
* the actions for the permission; must be the empty string or
* {@code null}
*
* @throws IllegalArgumentException
* if name is empty or invalid, or actions is a non-empty string
*/
public LinkPermission(String name, String actions) {
super(name);
checkName(name);
if (actions != null && !actions.isEmpty()) {
throw new IllegalArgumentException("actions: " + actions);
}
}
}