spring-cloud - route.uri 字段的文件方案

Question

像这样：
spring: cloud: gateway: routes: - id: static-file uri: file:///data/pub/ predicates: - Path=/file/** 它支持吗？
我想以ResourceHandlerRegistry.addResourceHandler这种方式替换。

Answer 1

我的实现是这样的：

@Component
public class GlobalFileRoutingFilter implements GlobalFilter, Ordered {

    private static final Log log = LogFactory.getLog(GlobalFileRoutingFilter.class);

    private final DispatcherHandler dispatcherHandler;

    public GlobalFileRoutingFilter(DispatcherHandler dispatcherHandler) {
        this.dispatcherHandler = dispatcherHandler;
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        Route route = (Route)exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR);
        if (route == null) {
            return chain.filter(exchange);
        } else {
            log.trace("GlobalFileRoutingFilter start");

            URI routeUri = route.getUri();
            String scheme = routeUri.getScheme();
            if (isAlreadyRouted(exchange) || !"file".equals(scheme)) {
                return chain.filter(exchange);
            }
            setAlreadyRouted(exchange);

            ServerHttpRequest request = exchange.getRequest();
            ServerHttpResponse response = exchange.getResponse();
            String filePath = routeUri.getPath() + File.separator + request.getURI().getPath();

            if (log.isTraceEnabled()) {
                log.trace("Reading from file: "+filePath);
            }

            if ("HEAD".equalsIgnoreCase(request.getMethod().toString())) {
                response.getHeaders().set(HttpHeaders.ACCEPT_RANGES, "none");
            } else {
                File file = new File(filePath);
                if (!file.exists()) {
                    response.setStatusCode(HttpStatus.NOT_FOUND);
                } else {
                    DataBuffer dataBuffer = response.bufferFactory().allocateBuffer();
                    try {
                        dataBuffer.write(IOUtils.toByteArray(new FileInputStream(file)));
                    } catch (IOException e) {
                        if (log.isErrorEnabled()) {
                            log.error(e);
                        }
                    }
                    return response.writeAndFlushWith(Flux.just(Flux.just(dataBuffer)));
                }
            }

            return Mono.empty();
        }
    }
}