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.cloudstack.network.tungsten.vrouter;
  
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpUriRequest;
  import org.apache.http.impl.client.CloseableHttpClient;
  import org.apache.http.impl.client.HttpClients;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.w3c.dom.Document;
  import org.xml.sax.SAXException;
  
  import java.io.IOException;
  
  import javax.xml.XMLConstants;
  import javax.xml.parsers.DocumentBuilder;
  import javax.xml.parsers.DocumentBuilderFactory;
  import javax.xml.parsers.ParserConfigurationException;
  
  public class IntrospectApiConnectorImpl implements IntrospectApiConnector {
      protected Logger logger = LogManager.getLogger(getClass());
      private final String vrouterUrl;
  
      public IntrospectApiConnectorImpl(VRouter vRouter) {
          vrouterUrl = "http://" + vRouter.getHost() + ":" + vRouter.getPort() + "/";
      }
  
      public Document getSnhItfReq(String uuid) {
          HttpUriRequest request = new HttpGet(this.vrouterUrl + "Snh_ItfReq?uuid=" + uuid);
          try (CloseableHttpClient httpClient = HttpClients.createDefault();
              CloseableHttpResponse httpResponse = httpClient.execute(request)) {
              return getResponse(httpResponse);
          } catch (IOException ex) {
              logger.error("Failed to connect host : " + ex.getMessage());
              return null;
          } catch (ParserConfigurationException ex) {
              logger.error("Failed to parse xml configuration : " + ex.getMessage());
              return null;
          } catch (SAXException ex) {
              logger.error("Failed to get xml data : " + ex.getMessage());
              return null;
          }
      }
  
      private Document getResponse(final CloseableHttpResponse httpResponse)
          throws IOException, ParserConfigurationException, SAXException {
          DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
          documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
          documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
          documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
          documentBuilderFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
          documentBuilderFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");
          documentBuilderFactory.setExpandEntityReferences(false);
          DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
          return documentBuilder.parse(httpResponse.getEntity().getContent());
      }
  }
  