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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.rest;
20  
21  import java.io.IOException;
22  
23  import javax.servlet.ServletException;
24  import javax.servlet.http.HttpServletRequest;
25  import javax.servlet.http.HttpServletResponse;
26  
27  import org.apache.hadoop.classification.InterfaceAudience;
28  
29  import com.sun.jersey.spi.container.servlet.ServletContainer;
30  
31  /**
32   * REST servlet container. It is used to get the remote request user
33   * without going through @HttpContext, so that we can minimize code changes.
34   */
35  @InterfaceAudience.Private
36  public class RESTServletContainer extends ServletContainer {
37    private static final long serialVersionUID = -2474255003443394314L;
38  
39    /**
40     * This container is used only if authentication and
41     * impersonation is enabled. The remote request user is used
42     * as a proxy user for impersonation in invoking any REST service.
43     */
44    @Override
45    public void service(final HttpServletRequest request,
46        final HttpServletResponse response) throws ServletException, IOException {
47      RESTServlet.getInstance().setEffectiveUser(request.getRemoteUser());
48      super.service(request, response);
49    }
50  }