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A version of the Rhino Javascript engine pulled diretly from the Mozialla repos.
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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released May 6, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.javascript;

import java.lang.ref.SoftReference;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessController;
import java.security.CodeSource;
import java.security.Policy;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.SecureClassLoader;
import java.util.Map;
import java.util.WeakHashMap;

import org.mozilla.classfile.ByteCode;
import org.mozilla.classfile.ClassFileWriter;

/**
 * A security controller relying on Java {@link Policy} in effect. When you use
 * this security controller, your securityDomain objects must be instances of
 * {@link CodeSource} representing the location from where you load your 
 * scripts. Any Java policy "grant" statements matching the URL and certificate
 * in code sources will apply to the scripts. If you specify any certificates 
 * within your {@link CodeSource} objects, it is your responsibility to verify
 * (or not) that the script source files are signed in whatever 
 * implementation-specific way you're using.
 * @author Attila Szegedi
 */
public class PolicySecurityController extends SecurityController
{
    private static final byte[] secureCallerImplBytecode = loadBytecode();

    // We're storing a CodeSource -> (ClassLoader -> SecureRenderer), since we
    // need to have one renderer per class loader. We're using weak hash maps
    // and soft references all the way, since we don't want to interfere with
    // cleanup of either CodeSource or ClassLoader objects.
    private static final Map>>
        callers =
            new WeakHashMap>>();
    
    @Override
    public Class getStaticSecurityDomainClassInternal() {
        return CodeSource.class;
    }

    private static class Loader extends SecureClassLoader
    implements GeneratedClassLoader
    {
        private final CodeSource codeSource;
        
        Loader(ClassLoader parent, CodeSource codeSource)
        {
            super(parent);
            this.codeSource = codeSource;
        }

        public Class defineClass(String name, byte[] data)
        {
            return defineClass(name, data, 0, data.length, codeSource);
        }
        
        public void linkClass(Class cl)
        {
            resolveClass(cl);
        }
    }
    
    @Override
    public GeneratedClassLoader createClassLoader(final ClassLoader parent, 
            final Object securityDomain)
    {
        return (Loader)AccessController.doPrivileged(
            new PrivilegedAction