feign之间传递oauth2 token的问题及解决方案

/**
 * 发送FeignClient设置Header信息.
 * http://www.itmuch.com/spring-cloud-sum/hystrix-threadlocal/
 * Hystrix传播ThreadLocal对象
 */
@Component
public class TokenFeignClientInterceptor implements RequestInterceptor {
  /**
   * token放在请求头.
   *
   * @param requestTemplate 请求参数
   */
  @Override
  public void apply(RequestTemplate requestTemplate) {
    RequestAttributes requestAttributes = RequestContextHolder.currentRequestAttributes();
    if (requestAttributes != null) {
      HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
      String token = request.getHeader(TokenContext.KEY_OAUTH2_TOKEN);
      requestTemplate.header(TokenContext.KEY_OAUTH2_TOKEN,
          new String[] {token});
    }
  }
}

hystrix.command.default.execution.isolation.strategy: SEMAPHORE 

security:
  oauth2:
    resource:
      id: user
      user-info-uri: http://${auth.host:localhost}:${auth.port:8002}/user # 这里是授权服务的地址，即auth-service
      prefer-token-info: false
auth:
  host: localhost  #这个不可以用eureka里的服务名，只能使用docker-compose里的服务名
  port: 8002

 Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
    String user = objectMapper.writeValueAsString(authentication.getPrincipal());

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
@Configuration
public class FeignOauth2RequestInterceptor implements RequestInterceptor {
    private final String AUTHORIZATION_HEADER = "Authorization";
    private final String BEARER_TOKEN_TYPE = "Bearer";
    @Override
    public void apply(RequestTemplate requestTemplate) {
        SecurityContext securityContext = SecurityContextHolder.getContext();
        Authentication authentication = securityContext.getAuthentication();
        if (authentication != null && authentication.getDetails() instanceof OAuth2AuthenticationDetails) {
            OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) authentication.getDetails();
            requestTemplate.header(AUTHORIZATION_HEADER, String.format("%s %s", BEARER_TOKEN_TYPE, details.getTokenValue()));
        }
    }
}