/**
 * Copyright (c) 2018-2028, Chill Zhuang 庄骞 (smallchill@163.com).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springblade.gateway.config;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springblade.gateway.handler.SwaggerResourceHandler;
import org.springblade.gateway.props.AuthProperties;
import org.springblade.gateway.props.RouteProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.filter.reactive.HiddenHttpMethodFilter;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;

/**
 * 路由配置信息
 *
 * @author Chill
 */
@Slf4j
@Configuration
@AllArgsConstructor
@EnableConfigurationProperties({RouteProperties.class, AuthProperties.class})
public class RouterFunctionConfiguration {

	private final SwaggerResourceHandler swaggerResourceHandler;

	@Bean
	public RouterFunction routerFunction() {
		return RouterFunctions.route(RequestPredicates.GET("/swagger-resources")
			.and(RequestPredicates.accept(MediaType.ALL)), swaggerResourceHandler);

	}

	/**
	 * 解决springboot2.0.5版本出现的 Only one connection receive subscriber allowed.
	 * 参考：https://github.com/spring-cloud/spring-cloud-gateway/issues/541
	 */
	@Bean
	public HiddenHttpMethodFilter hiddenHttpMethodFilter() {
		return new HiddenHttpMethodFilter() {
			@Override
			public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
				return chain.filter(exchange);
			}
		};
	}

}