Spring网络流量

Question

我目前正在使用自定义JWT身份验证进行SpringCloudGateway。身份验证后，我希望使用GlobalFilter将标头中的JWT令牌字符串传递到下游服务：

public class AddJwtHeaderGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        Mono<Principal> principal = exchange.getPrincipal();


        String jwtString = extract(principal);

        ServerHttpRequest request = exchange.getRequest()
                .mutate()
                .header("Authorization", new String[]{jwtString})
                .build();
        ServerWebExchange newExchange = exchange.mutate().request(request).build();
        return chain.filter(newExchange);
    }

    // how to implement this method in order to get a String type of jwt token?
    private String extract(Mono<Principal> principal) {
        //need to call getJwtString(Principal) and return the jwt string
        return null;
    }

    private String getJwtString(Principal principal) {
        return principal.getName();
    }

    @Override
    public int getOrder() {
        return HIGHEST_PRECEDENCE;
    }
}

JWT令牌字符串可以通过调用主体来获得。getName（）；

我的问题是：我如何实现字符串提取（Mono




Answer 1

通过链接到你的Mono，然后声明你想做什么。

@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) 
{
    return exchange.getPrincipal().flatMap(principal -> {

        // Do what you need to do

        return chain.filter( ... );
    });
}