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NashornScriptEngineCreator.java
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NashornScriptEngineCreator.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.ranger.plugin.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.script.ScriptEngine;
import org.openjdk.nashorn.api.scripting.ClassFilter;
import org.openjdk.nashorn.api.scripting.NashornScriptEngineFactory;
public class NashornScriptEngineCreator implements ScriptEngineCreator {
private static final Logger LOG = LoggerFactory.getLogger(NashornScriptEngineCreator.class);
private static final String[] SCRIPT_ENGINE_ARGS = new String[] { "--no-java", "--no-syntax-extensions" };
private static final String ENGINE_NAME = "NashornScriptEngine";
@Override
public ScriptEngine getScriptEngine(ClassLoader clsLoader) {
ScriptEngine ret = null;
if (clsLoader == null) {
clsLoader = Thread.currentThread().getContextClassLoader();
}
try {
NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
ret = factory.getScriptEngine(SCRIPT_ENGINE_ARGS, clsLoader, RangerClassFilter.INSTANCE);
} catch (Throwable t) {
LOG.debug("NashornScriptEngineCreator.getScriptEngine(): failed to create engine type {}", ENGINE_NAME, t);
}
return ret;
}
private static class RangerClassFilter implements ClassFilter {
static final RangerClassFilter INSTANCE = new RangerClassFilter();
private RangerClassFilter() {
}
@Override
public boolean exposeToScripts(String className) {
LOG.warn("script blocked: attempt to use Java class {}", className);
return false;
}
}
}