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.config.server.utils;
  
  import java.util.Map;
  
  import com.alibaba.nacos.config.server.exception.NacosException;
  
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * 参数合法性检查工具类
   *
   * @author Nacos
   */
  public class ParamUtils {
  
      private static char[] validChars = new char[] {'_', '-', '.', ':'};
  
      private final static int TAG_MAX_LEN = 16;
  
      private final static int TANANT_MAX_LEN = 128;
  
      /**
       * 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 checkParam(String dataId, String group, String datumId, String content) throws NacosException {
          if (StringUtils.isBlank(dataId) || !ParamUtils.isValid(dataId.trim())) {
              throw new NacosException(NacosException.INVALID_PARAM, "invalid dataId");
          } else if (StringUtils.isBlank(group) || !ParamUtils.isValid(group)) {
              throw new NacosException(NacosException.INVALID_PARAM, "invalid group");
          } else if (StringUtils.isBlank(datumId) || !ParamUtils.isValid(datumId)) {
              throw new NacosException(NacosException.INVALID_PARAM, "invalid datumId");
          } else if (StringUtils.isBlank(content)) {
              throw new NacosException(NacosException.INVALID_PARAM, "content is blank");
          } else if (content.length() > PropertyUtil.getMaxContent()) {
              throw new NacosException(NacosException.INVALID_PARAM,
                  "invalid content, over " + PropertyUtil.getMaxContent());
          }
      }
  
      public static void checkParam(String tag) {
          if (StringUtils.isNotBlank(tag)) {
              if (!ParamUtils.isValid(tag.trim())) {
                  throw new IllegalArgumentException("invalid tag");
              }
              if (tag.length() > TAG_MAX_LEN) {
                  throw new IllegalArgumentException("too long tag, over 16");
              }
          }
      }
  
      public static void checkTenant(String tenant) {
          if (StringUtils.isNotBlank(tenant)) {
              if (!ParamUtils.isValid(tenant.trim())) {
                  throw new IllegalArgumentException("invalid tenant");
              }
              if (tenant.length() > TANANT_MAX_LEN) {
                  throw new IllegalArgumentException("too long tag, over 128");
              }
          }
      }
  
      public static void checkParam(Map<String, Object> configAdvanceInfo) throws NacosException {
          for (Map.Entry<String, Object> configAdvanceInfoTmp : configAdvanceInfo.entrySet()) {
              if ("config_tags".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null) {
                      String[] tagArr = ((String)configAdvanceInfoTmp.getValue()).split(",");
                      if (tagArr.length > 5) {
                          throw new NacosException(NacosException.INVALID_PARAM, "too much config_tags, over 5");
                      }
                      for (String tag : tagArr) {
                          if (tag.length() > 64) {
                              throw new NacosException(NacosException.INVALID_PARAM, "too long tag, over 64");
                          }
                      }
                  }
              } else if ("desc".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null
                      && ((String)configAdvanceInfoTmp.getValue()).length() > 128) {
                      throw new NacosException(NacosException.INVALID_PARAM, "too long desc, over 128");
                  }
              } else if ("use".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null
                      && ((String)configAdvanceInfoTmp.getValue()).length() > 32) {
                      throw new NacosException(NacosException.INVALID_PARAM, "too long use, over 32");
                  }
              } else if ("effect".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null
                      && ((String)configAdvanceInfoTmp.getValue()).length() > 32) {
                      throw new NacosException(NacosException.INVALID_PARAM, "too long effect, over 32");
                  }
              } else if ("type".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null
                      && ((String)configAdvanceInfoTmp.getValue()).length() > 32) {
                      throw new NacosException(NacosException.INVALID_PARAM, "too long type, over 32");
                  }
              } else if ("schema".equals(configAdvanceInfoTmp.getKey())) {
                  if (configAdvanceInfoTmp.getValue() != null
                      && ((String)configAdvanceInfoTmp.getValue()).length() > 32768) {
                      throw new NacosException(NacosException.INVALID_PARAM, "too long schema, over 32768");
                  }
              } else {
                  throw new NacosException(NacosException.INVALID_PARAM, "invalid param");
              }
          }
      }
  
  }
  