content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.dolphinscheduler.api.interceptor;
  
  import org.apache.dolphinscheduler.common.constants.Constants;
  
  import java.util.Locale;
  
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.springframework.context.i18n.LocaleContextHolder;
  import org.springframework.lang.Nullable;
  import org.springframework.util.StringUtils;
  import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
  import org.springframework.web.util.WebUtils;
  
  public class LocaleChangeInterceptor extends HandlerInterceptorAdapter {
  
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
          Cookie cookie = WebUtils.getCookie(request, Constants.LOCALE_LANGUAGE);
          if (cookie != null) {
              // Proceed in cookie
              return true;
          }
          // Proceed in header
          String newLocale = request.getHeader(Constants.LOCALE_LANGUAGE);
          if (newLocale != null) {
              LocaleContextHolder.setLocale(parseLocaleValue(newLocale));
          }
          return true;
      }
  
      @Nullable
      protected Locale parseLocaleValue(String localeValue) {
          return StringUtils.parseLocale(localeValue);
      }
  
  }
  