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 org.apache.calcite.avatica.server;
  
  import javax.servlet.http.HttpServletRequest;
  
  /**
   * A {@link RemoteUserExtractor} that extracts the remote user from the HTTP request.
   */
  public class HttpRequestRemoteUserExtractor implements RemoteUserExtractor {
    @Override public String extract(HttpServletRequest request) throws RemoteUserExtractionException {
      final String remoteUser = request.getRemoteUser();
      if (remoteUser == null) {
        throw new RemoteUserExtractionException(
            "Failed to extract the remote user from the HTTP request");
      }
      return remoteUser;
    }
  
  }
  
  // End HttpRequestRemoteUserExtractor.java
  