content: /*
   * Copyright 1999-2023 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.paramcheck;
  
  import com.alibaba.nacos.api.exception.runtime.NacosRuntimeException;
  import com.alibaba.nacos.common.paramcheck.ParamInfo;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.config.server.constant.Constants;
  import com.alibaba.nacos.core.exception.ErrorCode;
  import com.alibaba.nacos.core.paramcheck.AbstractHttpParamExtractor;
  
  import jakarta.servlet.http.HttpServletRequest;
  import java.io.UnsupportedEncodingException;
  import java.net.URLDecoder;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * ConfigListener http param extractor.
   *
   * @author zhuoguang
   */
  public class ConfigListenerHttpParamExtractor extends AbstractHttpParamExtractor {
      
      static final char WORD_SEPARATOR_CHAR = (char) 2;
      
      static final char LINE_SEPARATOR_CHAR = (char) 1;
      
      @Override
      public List<ParamInfo> extractParam(HttpServletRequest request) throws NacosRuntimeException {
          ArrayList<ParamInfo> paramInfos = new ArrayList<>();
          String listenConfigs = request.getParameter("Listening-Configs");
          if (StringUtils.isBlank(listenConfigs)) {
              return paramInfos;
          }
          try {
              listenConfigs = URLDecoder.decode(listenConfigs, Constants.ENCODE);
          } catch (UnsupportedEncodingException e) {
              throw new NacosRuntimeException(ErrorCode.UnKnowError.getCode(), e);
          }
          if (StringUtils.isBlank(listenConfigs)) {
              return paramInfos;
          }
          String[] lines = listenConfigs.split(Character.toString(LINE_SEPARATOR_CHAR));
          for (String line : lines) {
              ParamInfo paramInfo = new ParamInfo();
              String[] words = line.split(Character.toString(WORD_SEPARATOR_CHAR));
              if (words.length < 2 || words.length > 4) {
                  throw new IllegalArgumentException("invalid probeModify");
              }
              paramInfo.setDataId(words[0]);
              paramInfo.setGroup(words[1]);
              if (words.length == 4) {
                  paramInfo.setNamespaceId(words[3]);
              }
              paramInfos.add(paramInfo);
          }
          return paramInfos;
      }
  }
  