1 files changed, 91 insertions, 0 deletions
diff --git a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/session/HiveSessionProxy.java b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/session/HiveSessionProxy.java
new file mode 100644
index 0000000000..5b10521feb
--- /dev/null
+++ b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/session/HiveSessionProxy.java
@@ -0,0 +1,91 @@
+/**
+ * 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);
+    }
+  }
+}
+