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 com.alibaba.nacos.api.common.Constants;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.core.context.RequestContextHolder;
  import com.alibaba.nacos.core.utils.WebUtils;
  import com.alibaba.nacos.plugin.auth.api.IdentityContext;
  
  import jakarta.servlet.http.HttpServletRequest;
  
  /**
   * Request util.
   *
   * @author Nacos
   */
  public class RequestUtil {
      
      public static final String CLIENT_APPNAME_HEADER = "Client-AppName";
      
      /**
       * Get real client ip from context first, if no value, use
       * {@link com.alibaba.nacos.core.utils.WebUtils#getRemoteIp(HttpServletRequest)}.
       *
       * @param request {@link HttpServletRequest}
       * @return remote ip address.
       */
      public static String getRemoteIp(HttpServletRequest request) {
          String remoteIp = RequestContextHolder.getContext().getBasicContext().getAddressContext().getSourceIp();
          if (StringUtils.isBlank(remoteIp)) {
              remoteIp = RequestContextHolder.getContext().getBasicContext().getAddressContext().getRemoteIp();
          }
          if (StringUtils.isBlank(remoteIp)) {
              remoteIp = WebUtils.getRemoteIp(request);
          }
          return remoteIp;
      }
      
      /**
       * Gets the name of the client application in the header.
       *
       * @param request {@link HttpServletRequest}
       * @return may be return null
       */
      public static String getAppName(HttpServletRequest request) {
          String result = RequestContextHolder.getContext().getBasicContext().getApp();
          return isUnknownApp(result) ? request.getHeader(CLIENT_APPNAME_HEADER) : result;
      }
      
      private static boolean isUnknownApp(String appName) {
          return StringUtils.isBlank(appName) || StringUtils.equalsIgnoreCase("unknown", appName);
      }
      
      /**
       * Gets the username of the client application in the Attribute.
       *
       * @param request {@link HttpServletRequest}
       * @return may be return null
       */
      public static String getSrcUserName(HttpServletRequest request) {
          IdentityContext identityContext = RequestContextHolder.getContext().getAuthContext().getIdentityContext();
          String result = StringUtils.EMPTY;
          if (null != identityContext) {
              result = (String) identityContext.getParameter(
                      com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_ID);
          }
          // If auth is disabled, get username from parameters by agreed key
          return StringUtils.isBlank(result) ? request.getParameter(Constants.USERNAME) : result;
      }
      
  }
  