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.client.config.utils;
  
  import java.util.List;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.client.utils.IPUtil;
  import com.alibaba.nacos.client.utils.StringUtils;
  
  /**
   * Param check util
   *
   * @author Nacos
   */
  public class ParamUtils {
  
      private static char[] validChars = new char[] {'_', '-', '.', ':'};
  
      /**
       * 白名单的方式检查, 合法的参数只能包含字母、数字、以及validChars中的字符, 并且不能为空
       *
       * @param param
       * @return
       */
      public static boolean isValid(String param) {
          if (param == null) {
              return false;
          }
          int length = param.length();
          for (int i = 0; i < length; i++) {
              char ch = param.charAt(i);
              if (!Character.isLetterOrDigit(ch) && !isValidChar(ch)) {
                  return false;
              }
          }
          return true;
      }
  
      private static boolean isValidChar(char ch) {
          for (char c : validChars) {
              if (c == ch) {
                  return true;
              }
          }
          return false;
      }
  
      public static void checkKeyParam(String dataId, String group) throws NacosException {
          if (StringUtils.isBlank(dataId) || !ParamUtils.isValid(dataId)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "dataId invalid");
          }
          if (StringUtils.isBlank(group) || !ParamUtils.isValid(group)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "group invalid");
          }
      }
  
      public static void checkTDG(String tenant, String dataId, String group) throws NacosException {
          checkTenant(tenant);
          if (StringUtils.isBlank(dataId) || !ParamUtils.isValid(dataId)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "dataId invalid");
          }
          if (StringUtils.isBlank(group) || !ParamUtils.isValid(group)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "group invalid");
          }
      }
  
      public static void checkKeyParam(String dataId, String group, String datumId)
          throws NacosException {
          if (StringUtils.isBlank(dataId) || !ParamUtils.isValid(dataId)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "dataId invalid");
          }
          if (StringUtils.isBlank(group) || !ParamUtils.isValid(group)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "group invalid");
          }
          if (StringUtils.isBlank(datumId) || !ParamUtils.isValid(datumId)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "datumId invalid");
          }
      }
  
      public static void checkKeyParam(List<String> dataIds, String group) throws NacosException {
          if (dataIds == null || dataIds.size() == 0) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "dataIds invalid");
          }
          for (String dataId : dataIds) {
              if (StringUtils.isBlank(dataId) || !ParamUtils.isValid(dataId)) {
                  throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "dataId invalid");
              }
          }
          if (StringUtils.isBlank(group) || !ParamUtils.isValid(group)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "group invalid");
          }
      }
  
      public static void checkParam(String dataId, String group, String content) throws NacosException {
          checkKeyParam(dataId, group);
          if (StringUtils.isBlank(content)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "content invalid");
          }
      }
  
      public static void checkParam(String dataId, String group, String datumId, String content) throws NacosException {
          checkKeyParam(dataId, group, datumId);
          if (StringUtils.isBlank(content)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "content invalid");
          }
      }
  
      public static void checkTenant(String tenant) throws NacosException {
          if (StringUtils.isBlank(tenant) || !ParamUtils.isValid(tenant)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "tenant invalid");
          }
      }
  
      public static void checkBetaIps(String betaIps) throws NacosException {
          if (StringUtils.isBlank(betaIps)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "betaIps invalid");
          }
          String[] ipsArr = betaIps.split(",");
          for (String ip : ipsArr) {
              if (!IPUtil.isIPV4(ip)) {
                  throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "betaIps invalid");
              }
          }
      }
  
      public static void checkContent(String content) throws NacosException {
          if (StringUtils.isBlank(content)) {
              throw new NacosException(NacosException.CLIENT_INVALID_PARAM, "content invalid");
          }
      }
  }
  