Spring 引导：调用受 OAuth2 保护的 REST 服务

Question

我有一个现有的 REST API 使用 Spring 引导构建。 在服务层上的一项功能中，我需要调用受 OAuth2（客户端凭据）保护的外部 REST 服务。

使用 Spring Boot 2.3，我意识到OAuth2RestTemplate已被弃用，所以我使用WebClient 。

按照本教程 - https://www.baeldung.com/spring-webclient-oauth2 ，我现在有我的WebClientConfig class 如下：

@Configuration
class WebClientConfig {    
    @Bean
    fun webClient(
            clientRegistrations: ClientRegistrationRepository?,
            authorizedClients: OAuth2AuthorizedClientRepository?): WebClient? {
        val oauth2 = ServletOAuth2AuthorizedClientExchangeFilterFunction(clientRegistrations, authorizedClients)
        oauth2.setDefaultOAuth2AuthorizedClient(false)
        oauth2.setDefaultClientRegistrationId("test")
        return WebClient.builder()
                .apply(oauth2.oauth2Configuration())
                .build()
    }
}

在我的属性文件中，我有：

spring:
  security:
    oauth2:
      client:
        registration:
          test:
            client-id: <redacted>
            client-secret: <redacted>
            authorization-grant-type: client_credentials
        provider:
          test:
            token-uri: <redacted>

我什至无法判断这是否有效，因为在访问与此 OAuth2 身份验证无关的 API 上的不同端点时，我不断收到以下错误：

java.lang.IllegalArgumentException: Invalid Authorization Grant Type (client_credentials) for Client Registration with Id: test

我束手无策，因为我无法克服这个问题......任何帮助将不胜感激！ 谢谢！

Answer 1

这对我有用：

  @Bean
  public WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
    ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client = new ServletOAuth2AuthorizedClientExchangeFilterFunction(
        authorizedClientManager);
    oauth2Client.setDefaultClientRegistrationId("test");

    return WebClient.builder()
        .apply(oauth2Client.oauth2Configuration())
        .build();
  }

  @Bean
  public OAuth2AuthorizedClientManager authorizedClientManager(
      ClientRegistrationRepository clientRegistrationRepository,
      OAuth2AuthorizedClientRepository authorizedClientRepository) {

    OAuth2AuthorizedClientProvider authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
        .refreshToken()
        .clientCredentials()
        .build();

    DefaultOAuth2AuthorizedClientManager authorizedClientManager = new DefaultOAuth2AuthorizedClientManager(
        clientRegistrationRepository, authorizedClientRepository);
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

    return authorizedClientManager;
  }