content: /*
   * Copyright 1999-$toady.year 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.service.query.handler;
  
  import com.alibaba.nacos.config.server.model.CacheItem;
  import com.alibaba.nacos.config.server.model.ConfigCacheGray;
  import com.alibaba.nacos.config.server.service.dump.disk.ConfigDiskServiceFactory;
  import com.alibaba.nacos.config.server.service.query.model.ConfigQueryChainRequest;
  import com.alibaba.nacos.config.server.service.query.model.ConfigQueryChainResponse;
  
  import java.io.IOException;
  
  /**
   * GrayRuleMatchHandler. This class represents a gray rule handler in the configuration query processing chain. It
   * checks if the request matches any gray rules and processes the request accordingly.
   *
   * @author Nacos
   */
  public class GrayRuleMatchHandler extends AbstractConfigQueryHandler {
      
      private static final String GRAY_RULE_MATCH_HANDLER = "grayRuleMatchHandler";
      
      @Override
      public String getName() {
          return GRAY_RULE_MATCH_HANDLER;
      }
      
      @Override
      public ConfigQueryChainResponse handle(ConfigQueryChainRequest request) throws IOException {
          // Check if the request matches any gray rules
          CacheItem cacheItem = ConfigChainEntryHandler.getThreadLocalCacheItem();
          ConfigCacheGray matchedGray = null;
          if (cacheItem.getSortConfigGrays() != null && !cacheItem.getSortConfigGrays().isEmpty()) {
              for (ConfigCacheGray configCacheGray : cacheItem.getSortConfigGrays()) {
                  if (configCacheGray.match(request.getAppLabels())) {
                      matchedGray = configCacheGray;
                      break;
                  }
              }
          }
          
          if (matchedGray != null) {
              ConfigQueryChainResponse response = new ConfigQueryChainResponse();
              
              long lastModified = matchedGray.getLastModifiedTs();
              String md5 = matchedGray.getMd5();
              String encryptedDataKey = matchedGray.getEncryptedDataKey();
              String content = ConfigDiskServiceFactory.getInstance()
                      .getGrayContent(request.getDataId(), request.getGroup(), request.getTenant(),
                              matchedGray.getGrayName());
              
              response.setContent(content);
              response.setMd5(md5);
              response.setLastModified(lastModified);
              response.setEncryptedDataKey(encryptedDataKey);
              response.setMatchedGray(matchedGray);
              response.setConfigType(cacheItem.getType());
              response.setStatus(ConfigQueryChainResponse.ConfigQueryStatus.CONFIG_FOUND_GRAY);
              
              return response;
          } else {
              return nextHandler.handle(request);
          }
      }
  }