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package org.elasticsearch.plugin.hadoop.hdfs;
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
import org.elasticsearch.SpecialPermission;
import java.net.URL;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.DomainCombiner;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
public abstract class Utils {
protected static AccessControlContext hadoopACC() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
// unprivileged code such as scripts do not have SpecialPermission
sm.checkPermission(new SpecialPermission());
}
return AccessController.doPrivileged(new PrivilegedAction<AccessControlContext>() {
@Override
public AccessControlContext run() {
return new AccessControlContext(AccessController.getContext(), new HadoopDomainCombiner());
}
});
}
private static class HadoopDomainCombiner implements DomainCombiner {
private static String BASE_LIB = detectLibFolder();
@Override
public ProtectionDomain[] combine(ProtectionDomain[] currentDomains, ProtectionDomain[] assignedDomains) {
for (ProtectionDomain pd : assignedDomains) {
if (pd.getCodeSource().getLocation().toString().startsWith(BASE_LIB)) {
return assignedDomains;
}
}
return currentDomains;
}
}
static String detectLibFolder() {
ClassLoader cl = Utils.class.getClassLoader();
// we could get the URL from the URLClassloader directly
// but that can create issues when running the tests from the IDE
// we could detect that by loading resources but that as well relies on
// the JAR URL
String classToLookFor = HdfsPlugin.class.getName().replace(".", "/").concat(".class");
URL classURL = cl.getResource(classToLookFor);
if (classURL == null) {
throw new IllegalStateException("Cannot detect itself; something is wrong with this ClassLoader " + cl);
}
String base = classURL.toString();
// extract root
// typically a JAR URL
int index = base.indexOf("!/");
if (index > 0) {
base = base.substring(0, index);
// remove its prefix (jar:)
base = base.substring(4);
// remove the trailing jar
index = base.lastIndexOf("/");
base = base.substring(0, index + 1);
}
// not a jar - something else, do a best effort here
else {
// remove the class searched
base = base.substring(0, base.length() - classToLookFor.length());
}
// append /
if (!base.endsWith("/")) {
base = base.concat("/");
}
return base;
}
}
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