spring WebSocketUpgradeHandlerPredicate 源码
spring WebSocketUpgradeHandlerPredicate 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/WebSocketUpgradeHandlerPredicate.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.reactive.socket.server.support;
import java.util.function.BiPredicate;
import org.springframework.http.HttpMethod;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.server.ServerWebExchange;
/**
* A predicate for use with
* {@link org.springframework.web.reactive.handler.AbstractUrlHandlerMapping#setHandlerPredicate}
* to ensure only WebSocket handshake requests are matched to handlers of type
* {@link WebSocketHandler}.
*
* @author Rossen Stoyanchev
* @since 5.3.5
*/
public class WebSocketUpgradeHandlerPredicate implements BiPredicate<Object, ServerWebExchange> {
@Override
public boolean test(Object handler, ServerWebExchange exchange) {
if (handler instanceof WebSocketHandler) {
HttpMethod method = exchange.getRequest().getMethod();
String header = exchange.getRequest().getHeaders().getUpgrade();
return (HttpMethod.GET.equals(method) && header != null && header.equalsIgnoreCase("websocket"));
}
return true;
}
}
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