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 
  24 import java.io.File;
  25 import java.io.IOException;
  26 import java.net.URL;
  27 import java.nio.file.Files;
  28 import java.security.AllPermission;
  29 import java.security.Permissions;
  30 import 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  */
  39 public class CustomSystemClassLoader extends ClassLoader {
  40 
  41 
  42     Class<?> loggerFinderClass = null;
  43 //    Class<?> loggerImplClass = null;
  44 
  45     public CustomSystemClassLoader() {
  46         super();
  47     }
  48     public CustomSystemClassLoader(ClassLoader parent) {
  49         super(parent);
  50     }
  51 
  52     private Class<?> defineFinderClass(String name)
  53         throws ClassNotFoundException {
  54         final Object obj = getClassLoadingLock(name);
  55         synchronized(obj) {
  56             if (loggerFinderClass != null) return loggerFinderClass;
  57 
  58             URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
  59             File file = new File(url.getPath(), name+".class");
  60             if (file.canRead()) {
  61                 try {
  62                     byte[] b = Files.readAllBytes(file.toPath());
  63                     Permissions perms = new Permissions();
  64                     perms.add(new AllPermission());
  65                     loggerFinderClass = defineClass(
  66                             name, b, 0, b.length, new ProtectionDomain(
  67                             this.getClass().getProtectionDomain().getCodeSource(),
  68                             perms));
  69                     System.out.println("Loaded " + name);
  70                     return loggerFinderClass;
  71                 } catch (Throwable ex) {
  72                     ex.printStackTrace();
  73                     throw new ClassNotFoundException(name, ex);
  74                 }
  75             } else {
  76                 throw new ClassNotFoundException(name,
  77                         new IOException(file.toPath() + ": can't read"));
  78             }
  79         }
  80     }
  81 //    private Class<?> defineLoggerImplClass(String name)
  82 //        throws ClassNotFoundException {
  83 //        final Object obj = getClassLoadingLock(name);
  84 //        synchronized(obj) {
  85 //            if (loggerImplClass != null) return loggerImplClass;
  86 //
  87 //            URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
  88 //            File file = new File(url.getPath(), name+".class");
  89 //            if (file.canRead()) {
  90 //                try {
  91 //                    byte[] b = Files.readAllBytes(file.toPath());
  92 //                    Permissions perms = new Permissions();
  93 //                    perms.add(new AllPermission());
  94 //                    loggerImplClass = defineClass(
  95 //                            name, b, 0, b.length, new ProtectionDomain(
  96 //                            this.getClass().getProtectionDomain().getCodeSource(),
  97 //                            perms));
  98 //                    System.out.println("Loaded " + name);
  99 //                    return loggerImplClass;
 100 //                } catch (Throwable ex) {
 101 //                    ex.printStackTrace();
 102 //                    throw new ClassNotFoundException(name, ex);
 103 //                }
 104 //            } else {
 105 //                throw new ClassNotFoundException(name,
 106 //                        new IOException(file.toPath() + ": can't read"));
 107 //            }
 108 //        }
 109 //    }
 110 //
 111     @Override
 112     public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
 113         if (name.endsWith("$LogProducerFinder")) {
 114             Class<?> c = defineFinderClass(name);
 115             if (resolve) {
 116                 resolveClass(c);
 117             }
 118             return c;
 119         }
 120 //        if (name.endsWith("$LogProducerFinder$LoggerImpl")) {
 121 //            Class<?> c = defineLoggerImplClass(name);
 122 //            if (resolve) {
 123 //                resolveClass(c);
 124 //            }
 125 //            return c;
 126 //        }
 127         return super.loadClass(name, resolve);
 128     }
 129 
 130     @Override
 131     protected Class<?> findClass(String name) throws ClassNotFoundException {
 132 //        if (name.endsWith("$LogProducerFinder$LoggerImpl")) {
 133 //            return defineLoggerImplClass(name);
 134 //        }
 135         if (name.endsWith("$$LogProducerFinder")) {
 136             return defineFinderClass(name);
 137         }
 138         return super.findClass(name);
 139     }
 140 
 141 }