spring PreFlightRequestWebFilter 源码
spring PreFlightRequestWebFilter 代码
文件路径：/spring-web/src/main/java/org/springframework/web/cors/reactive/PreFlightRequestWebFilter.java
/*
* Copyright 2002-2021 the original author or authors.
*
* 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
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* 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.springframework.web.cors.reactive;
import reactor.core.publisher.Mono;
import org.springframework.util.Assert;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
/**
* WebFilter that handles pre-flight requests through a
* {@link PreFlightRequestHandler} and bypasses the rest of the chain.
*
* <p>A WebFlux application can simply inject PreFlightRequestHandler and use
* it to create an instance of this WebFilter since {@code @EnableWebFlux}
* declares {@code DispatcherHandler} as a bean and that is a
* PreFlightRequestHandler.
*
* @author Rossen Stoyanchev
* @since 5.3.7
*/
public class PreFlightRequestWebFilter implements WebFilter {
private final PreFlightRequestHandler handler;
/**
* Create an instance that will delegate to the given handler.
*/
public PreFlightRequestWebFilter(PreFlightRequestHandler handler) {
Assert.notNull(handler, "PreFlightRequestHandler is required");
this.handler = handler;
}
@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
return (CorsUtils.isPreFlightRequest(exchange.getRequest()) ?
this.handler.handlePreFlight(exchange) : chain.filter(exchange));
}
}
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