content: /*
   * Copyright 1999-2021 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.auth.context;
  
  import com.alibaba.nacos.api.remote.request.Request;
  import com.alibaba.nacos.auth.config.NacosAuthConfig;
  import com.alibaba.nacos.plugin.auth.api.IdentityContext;
  import com.alibaba.nacos.plugin.auth.constant.Constants;
  import com.alibaba.nacos.plugin.auth.spi.server.AuthPluginManager;
  import com.alibaba.nacos.plugin.auth.spi.server.AuthPluginService;
  
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  
  /**
   * Identity context builder for Grpc.
   *
   * @author Nacos
   */
  public class GrpcIdentityContextBuilder implements IdentityContextBuilder<Request> {
      
      private final NacosAuthConfig authConfig;
      
      public GrpcIdentityContextBuilder(NacosAuthConfig authConfig) {
          this.authConfig = authConfig;
      }
      
      /**
       * get identity context from grpc.
       *
       * @param request grpc request
       * @return IdentityContext request context
       */
      
      @Override
      public IdentityContext build(Request request) {
          Optional<AuthPluginService> authPluginService = AuthPluginManager.getInstance()
                  .findAuthServiceSpiImpl(authConfig.getNacosAuthSystemType());
          IdentityContext result = new IdentityContext();
          getRemoteIp(request, result);
          if (!authPluginService.isPresent()) {
              return result;
          }
          Set<String> identityNames = new HashSet<>(authPluginService.get().identityNames());
          Map<String, String> map = request.getHeaders();
          for (Map.Entry<String, String> entry : map.entrySet()) {
              if (identityNames.contains(entry.getKey())) {
                  result.setParameter(entry.getKey(), entry.getValue());
              }
          }
          return result;
      }
      
      private void getRemoteIp(Request request, IdentityContext result) {
          result.setParameter(Constants.Identity.REMOTE_IP, request.getHeader(Constants.Identity.X_REAL_IP));
      }
  }
  