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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript;

/**
 * A java.lang.SecurityManager subclass that provides access to the current top-most
 * script class on the execution stack. This can be used to get the class loader or protection
 * domain of the script that triggered the current action. It is required for JavaAdapters to have
 * the same ProtectionDomain as the script code that created them. Embeddings that
 * implement their own SecurityManager can use this as base class.
 */
public class RhinoSecurityManager extends SecurityManager {

    /**
     * Get the class of the top-most stack element representing a script.
     *
     * @return The class of the top-most script in the current stack, or null if no script is
     *     currently running
     */
    protected Class getCurrentScriptClass() {
        Class[] context = getClassContext();
        for (Class c : context) {
            if (c != InterpretedFunction.class && NativeFunction.class.isAssignableFrom(c)
                    || PolicySecurityController.SecureCaller.class.isAssignableFrom(c)) {
                return c;
            }
        }
        return null;
    }
}