/*
 * 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.kyuubi.jdbc.hive.auth;

import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.security.auth.Subject;
import org.apache.kyuubi.shaded.thrift.transport.TTransport;
import org.apache.kyuubi.shaded.thrift.transport.TTransportException;
import org.apache.kyuubi.util.SubjectUtil;

/**
 * This is used on the client side, where the API explicitly opens transport to the server using the
 * Subject.doAs().
 */
public class TSubjectTransport extends TFilterTransport {

  private final Subject subject;

  public TSubjectTransport(TTransport wrapped, Subject subject) {
    super(wrapped);
    this.subject = subject;
  }

  @Override
  public void open() throws TTransportException {
    try {
      SubjectUtil.doAs(
          subject,
          (PrivilegedExceptionAction<Void>)
              () -> {
                try {
                  wrapped.open();
                } catch (TTransportException tte) {
                  // Wrap the transport exception in an RTE, since Subject.doAs() then goes
                  // and unwraps this for us out of the doAs block. We then unwrap one
                  // more time in our catch clause to get back the TTE. (ugh)
                  throw new RuntimeException(tte);
                }
                return null;
              });
    } catch (PrivilegedActionException ioe) {
      throw new RuntimeException("Received an ioe we never threw!", ioe);
    } catch (RuntimeException rte) {
      if (rte.getCause() instanceof TTransportException) {
        throw (TTransportException) rte.getCause();
      } else {
        throw rte;
      }
    }
  }
}
