plugins/network-elements/tungsten/src/main/java/org/apache/cloudstack/network/tungsten/vrouter/IntrospectApiConnectorImpl.java

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// 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
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// 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.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 {
    private static final Logger s_logger = Logger.getLogger(IntrospectApiConnectorImpl.class);
    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) {
            s_logger.error("Failed to connect host : " + ex.getMessage());
            return null;
        } catch (ParserConfigurationException ex) {
            s_logger.error("Failed to parse xml configuration : " + ex.getMessage());
            return null;
        } catch (SAXException ex) {
            s_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());
    }
}