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+/*
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+ * Copyright (c) 2018-2028, Chill Zhuang All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are met:
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+ *
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+ * Redistributions of source code must retain the above copyright notice,
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+ * this list of conditions and the following disclaimer.
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+ * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * Neither the name of the dreamlu.net developer nor the names of its
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+ * contributors may be used to endorse or promote products derived from
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+ * this software without specific prior written permission.
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+ * Author: Chill 庄骞 (smallchill@163.com)
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+ */
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+
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+package org.springblade.gateway.config;
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+
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+import lombok.AllArgsConstructor;
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+import lombok.extern.slf4j.Slf4j;
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+import org.springblade.gateway.handler.*;
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+import org.springframework.context.annotation.Bean;
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+import org.springframework.context.annotation.Configuration;
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+import org.springframework.http.HttpHeaders;
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+import org.springframework.http.HttpMethod;
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+import org.springframework.http.HttpStatus;
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+import org.springframework.http.MediaType;
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+import org.springframework.http.server.reactive.ServerHttpRequest;
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+import org.springframework.http.server.reactive.ServerHttpResponse;
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+import org.springframework.web.cors.reactive.CorsUtils;
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+import org.springframework.web.filter.reactive.HiddenHttpMethodFilter;
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+import org.springframework.web.reactive.function.server.RequestPredicates;
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+import org.springframework.web.reactive.function.server.RouterFunction;
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+import org.springframework.web.reactive.function.server.RouterFunctions;
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+import org.springframework.web.server.ServerWebExchange;
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+import org.springframework.web.server.WebFilter;
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+import org.springframework.web.server.WebFilterChain;
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+import reactor.core.publisher.Mono;
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+
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+/**
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+ * 路由配置信息
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+ *
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+ * @author Chill
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+ */
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+@Slf4j
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+@Configuration
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+@AllArgsConstructor
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+public class RouterFunctionConfiguration {
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+
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+ /**
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+ * 这里为支持的请求头,如果有自定义的header字段请自己添加
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+ */
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+ private static final String ALLOWED_HEADERS = "x-requested-with, blade-auth, Content-Type, Authorization, credential, X-XSRF-TOKEN, token, username, client";
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+ private static final String ALLOWED_METHODS = "*";
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+ private static final String ALLOWED_ORIGIN = "*";
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+ private static final String ALLOWED_EXPOSE = "*";
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+ private static final String MAX_AGE = "18000L";
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+
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+ private final HystrixFallbackHandler hystrixFallbackHandler;
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+ private final SwaggerResourceHandler swaggerResourceHandler;
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+ private final SwaggerSecurityHandler swaggerSecurityHandler;
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+ private final SwaggerUiHandler swaggerUiHandler;
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+
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+ @Bean
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+ public WebFilter corsFilter() {
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+ return (ServerWebExchange ctx, WebFilterChain chain) -> {
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+ ServerHttpRequest request = ctx.getRequest();
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+ if (CorsUtils.isCorsRequest(request)) {
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+ ServerHttpResponse response = ctx.getResponse();
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+ HttpHeaders headers = response.getHeaders();
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+ headers.add("Access-Control-Allow-Headers", ALLOWED_HEADERS);
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+ headers.add("Access-Control-Allow-Methods", ALLOWED_METHODS);
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+ headers.add("Access-Control-Allow-Origin", ALLOWED_ORIGIN);
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+ headers.add("Access-Control-Expose-Headers", ALLOWED_EXPOSE);
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+ headers.add("Access-Control-Max-Age", MAX_AGE);
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+ headers.add("Access-Control-Allow-Credentials", "true");
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+ if (request.getMethod() == HttpMethod.OPTIONS) {
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+ response.setStatusCode(HttpStatus.OK);
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+ return Mono.empty();
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+ }
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+ }
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+ return chain.filter(ctx);
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+ };
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+ }
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+
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+ @Bean
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+ public RouterFunction routerFunction() {
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+ return RouterFunctions.route(
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+ RequestPredicates.path("/fallback")
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+ .and(RequestPredicates.accept(MediaType.TEXT_PLAIN)), hystrixFallbackHandler)
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+ .andRoute(RequestPredicates.GET("/swagger-resources")
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+ .and(RequestPredicates.accept(MediaType.ALL)), swaggerResourceHandler)
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+ .andRoute(RequestPredicates.GET("/swagger-resources/configuration/ui")
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+ .and(RequestPredicates.accept(MediaType.ALL)), swaggerUiHandler)
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+ .andRoute(RequestPredicates.GET("/swagger-resources/configuration/security")
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+ .and(RequestPredicates.accept(MediaType.ALL)), swaggerSecurityHandler);
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+
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+ }
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+
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+ /**
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+ * 解决springboot2.0.5版本出现的 Only one connection receive subscriber allowed.
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+ * 参考:https://github.com/spring-cloud/spring-cloud-gateway/issues/541
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+ */
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+ @Bean
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+ public HiddenHttpMethodFilter hiddenHttpMethodFilter() {
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+ return new HiddenHttpMethodFilter() {
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+ @Override
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+ public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
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+ return chain.filter(exchange);
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+ }
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+ };
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+ }
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+
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+}
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