content: /*
   * Copyright (C) 2012-2023 52°North Spatial Information Research GmbH
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * If the program is linked with libraries which are licensed under one of
   * the following licenses, the combination of the program with the linked
   * library is not considered a "derivative work" of the program:
   *
   *     - Apache License, version 2.0
   *     - Apache Software License, version 1.0
   *     - GNU Lesser General Public License, version 3
   *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
   *     - Common Development and Distribution License (CDDL), version 1.0
   *
   * Therefore the distribution of the program linked with libraries licensed
   * under the aforementioned licenses, is permitted by the copyright holders
   * if the distribution is compliant with both the GNU General Public
   * License version 2 and the aforementioned licenses.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   * Public License for more details.
   */
  package org.n52.sos.ds.hibernate.util.procedure.create;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.util.Locale;
  import java.util.Scanner;
  
  import org.hibernate.Session;
  import org.n52.series.db.beans.ProcedureEntity;
  import org.n52.shetland.ogc.ows.exception.NoApplicableCodeException;
  import org.n52.shetland.ogc.ows.exception.OwsExceptionReport;
  import org.n52.shetland.ogc.sos.SosProcedureDescription;
  import org.n52.shetland.ogc.sos.SosProcedureDescriptionUnknownType;
  import org.n52.sos.ds.hibernate.util.procedure.HibernateProcedureCreationContext;
  import org.n52.svalbard.decode.exception.DecodingException;
  import org.n52.svalbard.util.XmlHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.base.Strings;
  
  public class LinkedDescriptionCreationStrategy implements DescriptionCreationStrategy {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(LinkedDescriptionCreationStrategy.class);
  
      @Override
      public boolean apply(ProcedureEntity p) {
          return p != null && !Strings.isNullOrEmpty(p.getDescriptionFile())
                  && (p.getDescriptionFile().startsWith("http"));
      }
  
      @Override
      public SosProcedureDescription<?> create(ProcedureEntity p, String descriptionFormat, Locale i18n,
              HibernateProcedureCreationContext ctx, Session s) throws OwsExceptionReport {
          String xml = loadDescriptionFromHttp(p.getDescriptionFile());
          return new SosProcedureDescriptionUnknownType(p.getIdentifier(), p.getFormat().getFormat(), xml);
      }
  
      private String loadDescriptionFromHttp(String descriptionFile) throws OwsExceptionReport {
          InputStream is = null;
          Scanner scanner = null;
          try {
              URL url = new URL(descriptionFile);
              HttpURLConnection request1 = (HttpURLConnection) url.openConnection();
              request1.setRequestMethod("GET");
              request1.connect();
              is = request1.getInputStream();
              scanner = new Scanner(is, "UTF-8");
              String inputStreamString = scanner.useDelimiter("\\A").next();
              return checkXml(inputStreamString);
          } catch (IOException | DecodingException e) {
              throw new NoApplicableCodeException().causedBy(e)
                      .withMessage("Error while querying sensor description from:{}", descriptionFile);
          } finally {
              if (scanner != null) {
                  scanner.close();
              }
              if (is != null) {
                  try {
                      is.close();
                  } catch (IOException ioe) {
                      LOGGER.error("Error while closing inputStream", ioe);
                  }
              }
          }
      }
  
      private String checkXml(String xml) throws DecodingException {
          XmlHelper.parseXmlString(xml);
          if (xml.startsWith("<?xml")) {
              return xml.substring(xml.indexOf(">") + 1);
          }
          return xml;
      }
  }
  