content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.common.tls;
  
  import com.alibaba.nacos.common.utils.InternetAddressUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.SSLSession;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * A HostnameVerifier verify ipv4 and localhost.
   *
   * @author wangwei
   */
  
  public final class SelfHostnameVerifier implements HostnameVerifier {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(SelfHostnameVerifier.class);
      
      private final HostnameVerifier hv;
      
      private static final ConcurrentHashMap<String, Boolean> HOSTS = new ConcurrentHashMap<>();
      
      private static final String[] LOCALHOST_HOSTNAME = new String[] {InternetAddressUtil.LOCAL_HOST,
              InternetAddressUtil.localHostIp()};
      
      public SelfHostnameVerifier(HostnameVerifier hv) {
          this.hv = hv;
      }
      
      @Override
      public boolean verify(String hostname, SSLSession session) {
          if (LOCALHOST_HOSTNAME[0].equalsIgnoreCase(hostname) || LOCALHOST_HOSTNAME[1].equals(hostname)) {
              return true;
          }
          if (isIp(hostname)) {
              return true;
          }
          return hv.verify(hostname, session);
      }
      
      private static boolean isIp(String host) {
          if (host == null || host.isEmpty()) {
              LOGGER.warn("host is empty, isIp = false");
              return false;
          }
          Boolean cacheHostVerify = HOSTS.get(host);
          if (cacheHostVerify != null) {
              return cacheHostVerify;
          }
          boolean isIp = InternetAddressUtil.isIp(host);
          HOSTS.putIfAbsent(host, isIp);
          return isIp;
      }
  }
  