是否可以在spring网关的application.properties配置中注册路由过滤器？

Question

我在spring网关项目中定义了一个自定义过滤器，现在我发现必须在代码中注册自定义过滤器，如下所示：

@Configuration
public class GatewayConfig {

    private final JwtAuthenticationFilter filter;

    public GatewayConfig(JwtAuthenticationFilter filter) {
        this.filter = filter;
    }

    @Bean
    public RouteLocator routes(RouteLocatorBuilder builder) {
        return builder.routes()
                .route("auth", r -> r.path("/auth/**").filters(f -> f.filter(filter)).uri("lb://auth"))
                .route("music", r -> r.path("/music/**").filters(f -> f.filter(filter)).uri("lb://dolphin-music")).build();
    }
}

如果不注册自定义筛选器，则筛选器将不会生效并按预期工作。但是，我已经在application.properties中像这样配置了路由：

# dolphin music
spring.cloud.gateway.discovery.locator.enabled=true
spring.cloud.gateway.discovery.locator.lower-case-service-id=true
spring.cloud.gateway.routes[0].id=dolphin-music-service
# forward by ip:port way
spring.cloud.gateway.routes[0].uri=http://10.107.64.246:11014
# forward by service name way
# spring.cloud.gateway.routes[0].uri=lb://
spring.cloud.gateway.routes[0].predicates[0]=Path=/music/**

我认为我们不应该在代码和配置文件中定义路由配置，我应该做什么来只注册过滤器？有什么更好的方法来处理这种情况吗？我应该在代码中定义路由吗？我认为文件中的配置会更多的flexible.BTW，这是JwtAuthenticationFilter

@Component
public class JwtAuthenticationFilter implements GatewayFilter {

    @Value("${dolphin.gateway.jwt.verify:true}")
    private boolean jwtVerfiy;

    final static List<String> apiEndpoints = List.of("/register", "/login");

    final static Predicate<ServerHttpRequest> isApiSecured = r -> apiEndpoints.stream()
            .noneMatch(uri -> r.getURI().getPath().contains(uri));

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        
        return chain.filter(exchange);
    }
}

我试图像这样添加MyFilterFactory：

@Component
public class MyFilterFactory extends AbstractGatewayFilterFactory<MyFilterFactory.Config> {

    @Autowired
    private JwtAuthenticationFilter jwtAuthenticationFilter;

    public MyFilterFactory() {
        super(Config.class);
    }

    @Override
    public GatewayFilter apply(Config config) {
        return jwtAuthenticationFilter; 
    }

    public static class Config {
    }

}

并在application.properties中的路由工厂中定义如下：

spring.cloud.gateway.routes[0].filters[0]=MyFilterFactory

问题是，请求没有输入定义的JwtAuthenticationFilter。

Answer 1

是的，有可能，需要注册一个扩展GatewayFilterFactory类的bean。

例如：

@Component
public class MyFilterFactory extends 
  AbstractGatewayFilterFactory<MyFilterFactory.Config> {

    public MyFilterFactory() {
        super(Config.class);
    }

    @Override
    public GatewayFilter apply(Config config) {
        return new MyFilter(); // or MyFilter(config), depending on your needs
    }

    public static class Config {
        // this can be empty if you don't need to pass any filter arguments
    }
}

然后您可以在application.properties文件中使用它的名称。

spring.cloud.gateway.routes[0].filters[0]=MyFilterFactory

不需要在属性文件.中使用工厂名称。