AccessControlContextFactory.java revision 1551:f3b883bec2d0 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.dynalink.internal;
27
28import java.security.AccessControlContext;
29import java.security.Permission;
30import java.security.Permissions;
31import java.security.ProtectionDomain;
32import java.util.stream.Stream;
33
34/**
35 * Utility class for creating permission-restricting {@link AccessControlContext}s.
36 */
37public final class AccessControlContextFactory {
38    private AccessControlContextFactory () {
39    }
40
41    /**
42     * Creates an access control context with no permissions.
43     * @return an access control context with no permissions.
44     */
45    public static AccessControlContext createAccessControlContext() {
46        return createAccessControlContext(new Permission[0]);
47    }
48
49    /**
50     * Creates an access control context limited to only the specified permissions.
51     * @param permissions the permissions for the newly created access control context.
52     * @return a new access control context limited to only the specified permissions.
53     */
54    public static AccessControlContext createAccessControlContext(final Permission... permissions) {
55        final Permissions perms = new Permissions();
56        for(final Permission permission: permissions) {
57            perms.add(permission);
58        }
59        return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) });
60    }
61
62    /**
63     * Creates an access control context limited to only the {@link RuntimePermission}s
64     * of the given names.
65     * @param runtimePermissionNames the names of runtime permissions for the
66     * newly created access control context.
67     * @return a new access control context limited to only the runtime
68     * permissions with the specified names.
69     */
70    public static AccessControlContext createAccessControlContext(final String... runtimePermissionNames) {
71        return createAccessControlContext(makeRuntimePermissions(runtimePermissionNames));
72    }
73
74    private static Permission[] makeRuntimePermissions(final String... runtimePermissionNames) {
75        return Stream.of(runtimePermissionNames).map(RuntimePermission::new).toArray(Permission[]::new);
76    }
77}
78