content: /*
   * Copyright 1999-2024 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.config.server.utils;
  
  import com.alibaba.nacos.config.server.model.ConfigListenState;
  import com.alibaba.nacos.config.server.service.ConfigCacheService;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static com.alibaba.nacos.api.common.Constants.VIPSERVER_TAG;
  
  /**
   * The type Nacos md5 comparator.
   *
   * @author Sunrisea
   */
  public class NacosMd5Comparator implements Md5Comparator {
      
      @Override
      public String getName() {
          return "nacos";
      }
      
      @Override
      public Map<String, ConfigListenState> compareMd5(HttpServletRequest request, HttpServletResponse response,
              Map<String, ConfigListenState> clientMd5Map) {
          HashMap<String, ConfigListenState> changedGroupKeys = new HashMap<>(clientMd5Map.size());
          String tag = request.getHeader(VIPSERVER_TAG);
          for (Map.Entry<String, ConfigListenState> entry : clientMd5Map.entrySet()) {
              String groupKey = entry.getKey();
              String clientMd5 = entry.getValue().getMd5();
              String ip = RequestUtil.getRemoteIp(request);
              boolean isUptodate = ConfigCacheService.isUptodate(groupKey, clientMd5, ip, tag);
              if (!isUptodate) {
                  changedGroupKeys.put(entry.getKey(), entry.getValue());
              }
          }
          return changedGroupKeys;
      }
  }
  