将OAuth2RestTemplate公开为AsyncRestTemplate

Question

我有一个可以工作的OAuth2RestTemplate客户端(我使用的是spring-security-OAuth22.0.7.RELEASE)。现在，我想将其公开/包装为AsyncRestTemplate，以利用ListenableFuture的异步语义。不幸的是，以下简单的方法不起作用：

// instantiate and configure OAuth2RestTemplate - works
OAuth2RestTemplate oAuth2RestTemplate = new OAuth2RestTemplate(...);

// wrap sync restTemplate with AsyncRestTemplate - doesn't work 
AsyncRestTemplate asyncRestTemplate = new AsyncRestTemplate(
    new HttpComponentsAsyncClientHttpRequestFactory(), oAuth2RestTemplate);

如何为我的OAuth2服务获取HTTP客户端作为AsyncRestTemplate？

Answer 1

好的，我可以通过手动设置"Authorization“头和OAuth2RestTemplate中的accessToken来让AsyncRestTemplate工作；下面是Spring java的配置：

@Bean
public OAuth2RestTemplate restTemplate() {
    ClientCredentialsResourceDetails details = new ClientCredentialsResourceDetails();
    // configure oauth details

    OAuth2RestTemplate restTemplate = new OAuth2RestTemplate(details);
    restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());

    return restTemplate;
}

@Bean
public AsyncRestTemplate asyncRestTemplate(final OAuth2RestTemplate oAuth2RestTemplate) {
    HttpComponentsAsyncClientHttpRequestFactory asyncRequestFactory = new HttpComponentsAsyncClientHttpRequestFactory() {
        @Override
        public AsyncClientHttpRequest createAsyncRequest(URI uri, HttpMethod httpMethod) throws IOException {
            AsyncClientHttpRequest asyncRequest = super.createAsyncRequest(uri, httpMethod);

            OAuth2AccessToken accessToken = oAuth2RestTemplate.getAccessToken();
            asyncRequest.getHeaders().set("Authorization", String.format("%s %s", accessToken.getTokenType(), accessToken.getValue()));

            return asyncRequest;
        }
    };
    return new AsyncRestTemplate(asyncRequestFactory, oAuth2RestTemplate);
}

我希望有更简单的方法在Spring中将已配置的OAuth2RestTemplate公开为AsyncRestTemplate。

Answer 2

上面的方法是有效的，但我发现了一种更简洁的方法。注册实现AsyncClientHttpRequestInterceptor

示例代码：

private class Oauth2RequestInterceptor implements AsyncClientHttpRequestInterceptor
{
    private final OAuth2RestTemplate oAuth2RestTemplate;

    public Oauth2RequestInterceptor( OAuth2RestTemplate oAuth2RestTemplate )
    {
        this.oAuth2RestTemplate = oAuth2RestTemplate;
    }

    public ListenableFuture<ClientHttpResponse> intercept( HttpRequest request, byte[] body,
        AsyncClientHttpRequestExecution execution ) throws IOException
    {
        OAuth2AccessToken accessToken = oAuth2RestTemplate.getAccessToken();
        request.getHeaders()
            .set( "Authorization", String.format( "%s %s", accessToken.getTokenType(), accessToken.getValue() ) );
        return execution.executeAsync( request, body );
    }
}

然后将其注册到您的AsyncRestTemplate

@Bean
public AsyncRestTemplate asyncRestTemplate( AsyncClientHttpRequestFactory factory, OAuth2RestTemplate restTemplate )
{
    AsyncRestTemplate asyncRestTemplate = new AsyncRestTemplate( factory, restTemplate );
    asyncRestTemplate.setInterceptors( Collections.singletonList( new Oauth2RequestInterceptor( restTemplate ) ) );
    return asyncRestTemplate;
}