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.console.handler.impl;
  
  import com.alibaba.nacos.console.handler.ServerStateHandler;
  import com.alibaba.nacos.sys.env.EnvUtil;
  import com.alibaba.nacos.sys.utils.DiskUtils;
  
  import java.io.File;
  
  import static com.alibaba.nacos.common.utils.StringUtils.FOLDER_SEPARATOR;
  import static com.alibaba.nacos.common.utils.StringUtils.TOP_PATH;
  import static com.alibaba.nacos.common.utils.StringUtils.WINDOWS_FOLDER_SEPARATOR;
  
  /**
   * Abstract Server state handler.
   *
   * @author xiweng.yy
   */
  public abstract class AbstractServerStateHandler implements ServerStateHandler {
      
      private static final String ANNOUNCEMENT_FILE = "announcement.conf";
      
      private static final String GUIDE_FILE = "console-guide.conf";
      
      @Override
      public String getAnnouncement(String language) {
          String file = ANNOUNCEMENT_FILE.substring(0, ANNOUNCEMENT_FILE.length() - 5) + "_" + language + ".conf";
          if (file.contains(TOP_PATH) || file.contains(FOLDER_SEPARATOR) || file.contains(WINDOWS_FOLDER_SEPARATOR)) {
              throw new IllegalArgumentException("Invalid filename");
          }
          File announcementFile = new File(EnvUtil.getConfPath(), file);
          String announcement = null;
          if (announcementFile.exists() && announcementFile.isFile()) {
              announcement = DiskUtils.readFile(announcementFile);
          }
          return announcement;
      }
      
      @Override
      public String getConsoleUiGuide() {
          File guideFile = new File(EnvUtil.getConfPath(), GUIDE_FILE);
          String guideInformation = null;
          if (guideFile.exists() && guideFile.isFile()) {
              guideInformation = DiskUtils.readFile(guideFile);
          }
          return guideInformation;
      }
  }
  