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.authorizer;
  
  import java.util.Map;
  
  import backtype.storm.security.auth.IAuthorizer;
  import backtype.storm.security.auth.ReqContext;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public abstract class DRPCAuthorizerBase implements IAuthorizer {
      public static Logger LOG = LoggerFactory.getLogger(DRPCAuthorizerBase.class);
  
      /**
       * A key name for the function requested to be executed by a user.
       */
      public static final String FUNCTION_NAME = "function.name";
  
      @Override
      public abstract void prepare(Map conf);
  
      abstract protected boolean permitClientRequest(ReqContext context, String operation, Map params);
  
      abstract protected boolean permitInvocationRequest(ReqContext context, String operation, Map params);
  
      /**
       * Authorizes request from to the DRPC server.
       * 
       * @param context the client request context
       * @param operation the operation requested by the DRPC server
       * @param params a Map with any key-value entries of use to the authorization implementation
       */
      @Override
      public boolean permit(ReqContext context, String operation, Map params) {
          if ("execute".equals(operation)) {
              return permitClientRequest(context, operation, params);
          } else if ("failRequest".equals(operation) || "fetchRequest".equals(operation) || "result".equals(operation)) {
              return permitInvocationRequest(context, operation, params);
          }
          // Deny unsupported operations.
          LOG.warn("Denying unsupported operation \"" + operation + "\" from " + context.remoteAddress());
          return false;
      }
  }
  