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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.io.File;
25import java.io.IOException;
26import java.net.URL;
27import java.nio.file.Files;
28import java.security.AllPermission;
29import java.security.Permissions;
30import java.security.ProtectionDomain;
31
32
33/**
34 * A custom ClassLoader to load the concrete LoggerFinder class
35 * with all permissions.
36 *
37 * @author danielfuchs
38 */
39public class CustomSystemClassLoader extends ClassLoader {
40
41
42    Class<?> finderClass = null;
43
44    public CustomSystemClassLoader() {
45        super();
46    }
47    public CustomSystemClassLoader(ClassLoader parent) {
48        super(parent);
49    }
50
51    private Class<?> defineFinderClass(String name)
52        throws ClassNotFoundException {
53        final Object obj = getClassLoadingLock(name);
54        synchronized(obj) {
55            if (finderClass != null) return finderClass;
56
57            URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
58            File file = new File(url.getPath(), name+".class");
59            if (file.canRead()) {
60                try {
61                    byte[] b = Files.readAllBytes(file.toPath());
62                    Permissions perms = new Permissions();
63                    perms.add(new AllPermission());
64                    finderClass = defineClass(
65                            name, b, 0, b.length, new ProtectionDomain(
66                            this.getClass().getProtectionDomain().getCodeSource(),
67                            perms));
68                    System.out.println("Loaded " + name);
69                    return finderClass;
70                } catch (Throwable ex) {
71                    ex.printStackTrace();
72                    throw new ClassNotFoundException(name, ex);
73                }
74            } else {
75                throw new ClassNotFoundException(name,
76                        new IOException(file.toPath() + ": can't read"));
77            }
78        }
79    }
80
81    @Override
82    public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
83        if (name.endsWith("$BaseLoggerFinder")) {
84            Class<?> c = defineFinderClass(name);
85            if (resolve) {
86                resolveClass(c);
87            }
88            return c;
89        }
90        return super.loadClass(name, resolve);
91    }
92
93    @Override
94    protected Class<?> findClass(String name) throws ClassNotFoundException {
95        if (name.endsWith("$BaseLoggerFinder")) {
96            return defineFinderClass(name);
97        }
98        return super.findClass(name);
99    }
100
101}
102