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.ambari.view.examples;
  
  import org.apache.ambari.view.ViewContext;
  import org.apache.ambari.view.AmbariStreamProvider;
  import org.apache.ambari.view.URLStreamProvider;
  import org.apache.ambari.view.cluster.Cluster;
  import org.apache.commons.codec.binary.Base64;
  import jakarta.inject.Inject;
  import jakarta.ws.rs.GET;
  import jakarta.ws.rs.POST;
  import jakarta.ws.rs.Path;
  import jakarta.ws.rs.PathParam;
  import jakarta.ws.rs.Produces;
  import jakarta.ws.rs.Consumes;
  import jakarta.ws.rs.core.Context;
  import jakarta.ws.rs.core.HttpHeaders;
  import jakarta.ws.rs.core.Response;
  import jakarta.ws.rs.core.UriInfo;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.util.Map;
  import java.util.HashMap;
  
  import java.util.Iterator;
  
  /**
   * The AutoClusterService service.
   */
  public class AutoClusterService {
  
    /**
     * The view context.
     */
    @Inject
    ViewContext context;
    
    /**
     * Handles: GET /.
     *
     * @param headers   http headers
     * @param ui        uri info
     *
     * @return value JSON representation
     */
    @GET
    @Path("/")
    @Produces({"text/plain", "application/json"})
    public Response getValue(@Context HttpHeaders headers, @Context UriInfo ui) {
  
      StringBuilder sb = new StringBuilder();
      try {
          InputStream in = null;
  
          //
          // do I have a cluster associated with this view instance?
          //
          Cluster c = context.getCluster();
          if (c != null) {
              AmbariStreamProvider stream = context.getAmbariStreamProvider();
  
              // use the cluster name and AmbariStreamProvider to access Ambari REST API
              String clusterName = c.getName();
              in = stream.readFrom("/api/v1/clusters/"+clusterName, "GET", null, null, true);
          } else {
              URLStreamProvider stream = context.getURLStreamProvider();
              
              // use the view instance configuration to access Ambari REST API
              String baseUrl = context.getProperties().get("ambari.server.url");
              String username = context.getProperties().get("ambari.server.username");
              String password = context.getProperties().get("ambari.server.password");
  
              HashMap<String, String> hds = new HashMap<String, String>();
              hds.put("X-Requested-By", "auto-cluster-view");
  
              String authString = username + ":" + password;
              byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
              String authStringEnc = new String(authEncBytes);
  
              hds.put("Authorization", "Basic " + authStringEnc);
  
              in = stream.readFrom(baseUrl, "GET", null, hds);
          }
          
          BufferedReader r = new BufferedReader(new InputStreamReader(in));
          String str = null;
          while ((str = r.readLine()) != null) {
              sb.append(str);
          }
          
      } catch (java.io.IOException ioe) {
          ioe.printStackTrace(); //!!!
      }
          
      return Response.ok(sb.toString()).build();
    }
      
  } // end AutoClusterService
  