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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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.geode.management.internal.configuration.utils;

import org.apache.geode.distributed.internal.DistributionConfig;
import org.apache.geode.internal.cache.xmlcache.CacheXml;
import org.apache.commons.io.FileUtils;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;

import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/******
 * This class is used to resolve the location of DTD. During development time the dtd for the latest
 * version is not published on the www.gemstone.com , then the dtd should be picked up as a resource
 * from the Jar file.
 *
 * @deprecated As of 8.1 use {@link CacheXml}
 */
@Deprecated
public class DtdResolver implements EntityResolver {

  @Deprecated
  public InputSource resolveEntity(String publicId, String systemId) throws IOException {
    if (!isHttpUrlOK(systemId)) {
      URL dtdURL = getClass().getResource(CacheXml.LATEST_DTD_LOCATION);
      File dtd = new File(DistributionConfig.GEMFIRE_PREFIX + "dtd");
      FileUtils.copyURLToFile(dtdURL, dtd);
      InputSource inputSource = new InputSource(FileUtils.openInputStream(dtd));
      FileUtils.deleteQuietly(dtd);
      return inputSource;
    } else {
      return null;
    }
  }

  /****
   * Checks if the url passed , can be contacted or not.
   * 
   * @param urlString
   * @return true if the URL is up and can be contacted.
   */
  @Deprecated
  public boolean isHttpUrlOK(String urlString) {
    try {
      URL e = new URL(urlString);
      HttpURLConnection urlConnection = (HttpURLConnection) e.openConnection();
      urlConnection.setRequestMethod("HEAD");
      int responseCode = urlConnection.getResponseCode();
      if (responseCode == 200) {
        return true;
      } else {
        return false;
      }
    } catch (Exception e) {
      return false;
    }
  }

  /***
   * Gets the URL for Cache dtd
   * 
   * @return dtd url as string
   * @throws MalformedURLException
   */
  @Deprecated
  public URL getDtdUrl() throws MalformedURLException {
    if (isHttpUrlOK(CacheXml.LATEST_SYSTEM_ID)) {
      return new URL(CacheXml.LATEST_SYSTEM_ID);
    } else {
      URL dtdURL = getClass().getResource(CacheXml.LATEST_DTD_LOCATION);
      return dtdURL;
    }
  }
}