feign整合oauth2 使用笔记

1. 编写配置类

   @Slf4j
   public class OAuth2FeignConfiguration {
   
       @Value("${auth.server.access-token-uri}")
       private String accessTokenUri;
       @Value("${auth.server.client-id}")
       private String clientId;
       @Value("${auth.server.client-secret}")
       private String clientSecret;
       @Value("${auth.server.host}")
       private String host;
   
       public OAuth2ClientContext oAuth2ClientContext = new DefaultOAuth2ClientContext();
   
       @Bean
       public ErrorDecoder errorDecoder() {
           return (methodKey, response) -> {
               if (response.status() == HttpStatus.UNAUTHORIZED.value()) {
                   oAuth2ClientContext.setAccessToken(null);
                   throw new RetryableException(response.status(), "access_token expire, retry", response.request().httpMethod(), new Date());
               }
               String message = response.reason();
               try {
                   message = IOUtils.toString(response.body().asInputStream(), StandardCharsets.UTF_8);
               } catch (IOException e) {
                   log.error("error decode error: {}", e);
               }
               return new RuntimeException("[" + methodKey + "], status: " + response.status() + ", message: " + message);
           };
       }
   
       @Bean
       public Retryer feignRetryer() {
           return new Retryer.Default(100, SECONDS.toMillis(1), 2);
       }
   
       @Bean
       RequestInterceptor oauth2FeignRequestInterceptor() {
    	   return new OAuth2FeignInterceptor(oAuth2ClientContext, resource(), host);
       }
       
       private ClientCredentialsResourceDetails resource() {
    	   ClientCredentialsResourceDetails resource = new ClientCredentialsResourceDetails();
    	   resource.setAccessTokenUri(accessTokenUri);
    	   resource.setClientId(clientId);
    	   resource.setClientSecret(clientSecret);
    	   return resource;
       }
   }
   

2. 自定义：OAuth2FeignRequestInterceptor

   @Slf4j
   class OAuth2FeignInterceptor extends OAuth2FeignRequestInterceptor {
   
       private final String target;
   
       public OAuth2FeignInterceptor(OAuth2ClientContext oAuth2ClientContext, OAuth2ProtectedResourceDetails resource, String target) {
           super(oAuth2ClientContext, resource);
           this.target = target;
       }
   
       @Override
       public void apply(RequestTemplate template) {
           if (StringUtils.isNotEmpty(target)) {
               template.target(target);
           }
           super.apply(template);
       }
   }
   

3. 编写测试类

   @FeignClient(
   	  name = "hello-service", 
   	  configuration = OAuth2FeignConfiguration.class
   )
   public interface HelloFeignClient {
   
       @GetMapping("/hello/index/{userId}")
       UserInfo index(@PathVariable("userId") String userId);
   }