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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.hive.service.cli.session;
/**
* Proxy wrapper on HiveSession to execute operations
* by impersonating given user
*/
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hive.service.cli.HiveSQLException;
public class HiveSessionProxy implements InvocationHandler {
private final HiveSession base;
private final UserGroupInformation ugi;
public HiveSessionProxy(HiveSession hiveSession, UserGroupInformation ugi) {
this.base = hiveSession;
this.ugi = ugi;
}
public static HiveSession getProxy(HiveSession hiveSession, UserGroupInformation ugi)
throws IllegalArgumentException, HiveSQLException {
return (HiveSession)Proxy.newProxyInstance(HiveSession.class.getClassLoader(),
new Class<?>[] {HiveSession.class},
new HiveSessionProxy(hiveSession, ugi));
}
@Override
public Object invoke(Object arg0, final Method method, final Object[] args)
throws Throwable {
try {
if (method.getDeclaringClass() == HiveSessionBase.class) {
return invoke(method, args);
}
return ugi.doAs(
new PrivilegedExceptionAction<Object> () {
@Override
public Object run() throws HiveSQLException {
return invoke(method, args);
}
});
} catch (UndeclaredThrowableException e) {
Throwable innerException = e.getCause();
if (innerException instanceof PrivilegedActionException) {
throw innerException.getCause();
} else {
throw e.getCause();
}
}
}
private Object invoke(final Method method, final Object[] args) throws HiveSQLException {
try {
return method.invoke(base, args);
} catch (InvocationTargetException e) {
if (e.getCause() instanceof HiveSQLException) {
throw (HiveSQLException)e.getCause();
}
throw new RuntimeException(e.getCause());
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
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