content: /*
   * Copyright 1999-2025 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.plugin.auth.impl.users;
  
  import com.alibaba.nacos.api.model.Page;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.core.utils.Loggers;
  import com.alibaba.nacos.plugin.auth.impl.persistence.User;
  import org.springframework.scheduling.annotation.Scheduled;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Nacos abstract cached user service.
   *
   * @author xiweng.yy
   */
  public abstract class AbstractCachedUserService implements NacosUserService {
      
      private Map<String, User> userMap = new ConcurrentHashMap<>();
      
      protected AbstractCachedUserService() {
      }
      
      protected Map<String, User> getCachedUserMap() {
          return userMap;
      }
      
      @Scheduled(initialDelay = 5000, fixedDelay = 15000)
      protected void reload() {
          try {
              Page<User> users = getUsers(1, Integer.MAX_VALUE, StringUtils.EMPTY);
              if (users == null) {
                  return;
              }
              
              Map<String, User> map = new ConcurrentHashMap<>(16);
              for (User user : users.getPageItems()) {
                  map.put(user.getUsername(), user);
              }
              userMap = map;
          } catch (Exception e) {
              Loggers.AUTH.warn("[LOAD-USERS] load failed", e);
          }
      }
  
      /**
       * [ISSUE #13625] check username and password is blank.
       */
      protected void validateUserCredentials(String username, String password) {
          if (StringUtils.isBlank(username)) {
              throw new IllegalArgumentException("username is blank");
          }
          if (StringUtils.isBlank(password)) {
              throw new IllegalArgumentException("password is blank");
          }
      }
  }
  