使用OAuth2资源所有者密码授予类型在Spring Cloud Gateway中创建路由

Question

如何将Spring Cloud Gateway中的路由配置为使用具有authorization-grant-type:password的OAuth2客户端？换句话说，如何将请求中带有令牌的授权头添加到API？因为我正在与遗留应用程序集成，所以必须使用grant类型密码。

我有这个申请：

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
        return builder.routes()
           .route("route_path", r -> r.path("/**")
                   .filters(f -> f.addRequestHeader("Authorization", "bearer <token>"))
                   .uri("http://localhost:8092/messages"))
           .build();
    }
}

用一个实际的令牌替换 ，一切正常。

我发现这个项目做了类似的事情:https://github.com/jgrandja/spring-security-oauth-5-2-migrate。它有一个客户机(messaging-client-password)，用于配置WebClient，以添加OAuth2支持来发出请求（即通过添加授权头）。

首先，我发现了如何将WebClientConfig转换为反应性：

@Configuration
public class WebClientConfig {

    @Bean
    WebClient webClient(ReactiveOAuth2AuthorizedClientManager authorizedClientManager) {
        ServerOAuth2AuthorizedClientExchangeFilterFunction oauth =
                new ServerOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
        oauth.setDefaultOAuth2AuthorizedClient(true);
        oauth.setDefaultClientRegistrationId("messaging-client-password");
        return WebClient.builder()
                .filter(oauth)
                .build();
    }

    @Bean
    ReactiveOAuth2AuthorizedClientManager authorizedClientManager(
            ReactiveClientRegistrationRepository clientRegistrationRepository,
            ServerOAuth2AuthorizedClientRepository authorizedClientRepository) {

        ReactiveOAuth2AuthorizedClientProvider authorizedClientProvider =
                ReactiveOAuth2AuthorizedClientProviderBuilder.builder()
                        .refreshToken()
                        .password()
                        .build();
        DefaultReactiveOAuth2AuthorizedClientManager authorizedClientManager =
                new DefaultReactiveOAuth2AuthorizedClientManager(
                        clientRegistrationRepository, authorizedClientRepository);
        authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

        // For the `password` grant, the `username` and `password` are supplied via request parameters,
        // so map it to `OAuth2AuthorizationContext.getAttributes()`.
        authorizedClientManager.setContextAttributesMapper(contextAttributesMapper());

        return authorizedClientManager;
    }

    private Function<OAuth2AuthorizeRequest, Mono<Map<String, Object>>> contextAttributesMapper() {
        return authorizeRequest -> {
            Map<String, Object> contextAttributes = Collections.emptyMap();
            ServerWebExchange serverWebExchange = authorizeRequest.getAttribute(ServerWebExchange.class.getName());
            String username = serverWebExchange.getRequest().getQueryParams().getFirst(OAuth2ParameterNames.USERNAME);
            String password = serverWebExchange.getRequest().getQueryParams().getFirst(OAuth2ParameterNames.PASSWORD);
            if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
                contextAttributes = new HashMap<>();

                // `PasswordOAuth2AuthorizedClientProvider` requires both attributes
                contextAttributes.put(OAuth2AuthorizationContext.USERNAME_ATTRIBUTE_NAME, username);
                contextAttributes.put(OAuth2AuthorizationContext.PASSWORD_ATTRIBUTE_NAME, password);
            }
            return Mono.just(contextAttributes);
        };
    }
}

通过这种配置，我们可以使用WebClient发出请求。这在调用endpoint后以某种方式初始化OAuth2客户机：

@GetMapping("/explicit")
public Mono<String[]> explicit() {
    return this.webClient
        .get()
        .uri("http://localhost:8092/messages")
        .attributes(clientRegistrationId("messaging-client-password"))
        .retrieve()
        .bodyToMono(String[].class);
}

然后，通过调用这个函数，我们可以获得对授权客户机的引用：

private OAuth2AuthorizedClient authorizedClient;
@GetMapping("/token")
public String token(@RegisteredOAuth2AuthorizedClient("messaging-client-password") OAuth2AuthorizedClient authorizedClient) {
    this.authorizedClient = authorizedClient;
    return authorizedClient.getAccessToken().getTokenValue();
}

@Bean
public GlobalFilter customGlobalFilter() {
    return (exchange, chain) -> {
        //adds header to proxied request
        exchange.getRequest().mutate().header("Authorization", authorizedClient.getAccessToken().getTokenType().getValue() + " " + authorizedClient.getAccessToken().getTokenValue()).build();
        return chain.filter(exchange);
    };
}

1. 在筛选器中获取授权客户端的引用
2. 使用ContextAttributesMapper
用凭据初始化授权客户端
3. 将所有这些都写入筛选器，而不是全局筛选器。TokenRelayGatewayFilterFactory实现可以提供很好的帮助。

Answer 1

我使用WebClienthtTProutingFilter实现了authorization-grant-type:password。

默认情况下，spring cloud gateway使用Netty Routing Filter，但也有一种不需要Netty的选择(https://cloud.spring.io/spring-cloud-gateway/reference/html/#the-netty-routing-filter）

WebClienthtTProutingFilter使用WebClient路由请求。

WebClient可以通过ExchangeFilterFunction(https://docs.spring.io/spring-security/site/docs/current/reference/html5/#WebClient)配置ReactiveOAuth2AuthorizedClientManager。ReactiveOAuth2AuthorizedClientManager将负责管理访问/刷新令牌，并为您完成所有艰巨的工作

在这里，您可以回顾这个实现。此外，我用这种方法实现了客户机凭据授予