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.chemistry.opencmis.server.shared;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  
  import org.apache.chemistry.opencmis.commons.server.CallContext;
  
  /**
   * Call Context handler that takes the user from a request attribute.
   * 
   * If the current user is determined in a filter, the filter can set the
   * following attribute to pass down the user name to OpenCMIS with this
   * CallContextHandler.
   * 
   * <pre>
   * {@code
   *  request.setAttribute(AttributeCallContextHandler.USERNAME_ATTRIBUTE, user);
   * }
   * </pre>
   */
  public class AttributeCallContextHandler implements CallContextHandler, Serializable {
  
      private static final long serialVersionUID = 1L;
  
      public static final String USERNAME_ATTRIBUTE = "org.apache.chemistry.opencmis.server.username";
  
      /**
       * Constructor.
       */
      public AttributeCallContextHandler() {
      }
  
      @Override
      public Map<String, String> getCallContextMap(HttpServletRequest request) {
          assert request != null;
  
          Map<String, String> result = null;
  
          if (request.getAttribute(USERNAME_ATTRIBUTE) != null) {
              result = new HashMap<String, String>(2);
              result.put(CallContext.USERNAME, request.getAttribute(USERNAME_ATTRIBUTE).toString());
          }
  
          return result;
      }
  }
  