content: /**
   * 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 backtype.storm.security.auth.digest;
  
  import java.io.IOException;
  import java.util.Map;
  
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.login.Configuration;
  
  import org.apache.thrift.transport.TSaslClientTransport;
  import org.apache.thrift.transport.TSaslServerTransport;
  import org.apache.thrift.transport.TTransport;
  import org.apache.thrift.transport.TTransportException;
  import org.apache.thrift.transport.TTransportFactory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import backtype.storm.security.auth.AuthUtils;
  import backtype.storm.security.auth.SaslTransportPlugin;
  
  public class DigestSaslTransportPlugin extends SaslTransportPlugin {
      public static final String DIGEST = "DIGEST-MD5";
      private static final Logger LOG = LoggerFactory.getLogger(DigestSaslTransportPlugin.class);
  
      protected TTransportFactory getServerTransportFactory() throws IOException {
          // create an authentication callback handler
          CallbackHandler serer_callback_handler = new ServerCallbackHandler(login_conf);
  
          // create a transport factory that will invoke our auth callback for digest
          TSaslServerTransport.Factory factory = new TSaslServerTransport.Factory();
          factory.addServerDefinition(DIGEST, AuthUtils.SERVICE, "localhost", null, serer_callback_handler);
  
          LOG.info("SASL DIGEST-MD5 transport factory will be used");
          return factory;
      }
  
      @Override
      public TTransport connect(TTransport transport, String serverHost, String asUser) throws TTransportException, IOException {
          ClientCallbackHandler client_callback_handler = new ClientCallbackHandler(login_conf);
          TSaslClientTransport wrapper_transport =
                  new TSaslClientTransport(DIGEST, null, AuthUtils.SERVICE, serverHost, null, client_callback_handler, transport);
  
          wrapper_transport.open();
          LOG.debug("SASL DIGEST-MD5 client transport has been established");
  
          return wrapper_transport;
      }
  
  }
  