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StandardWebSocketUpgradeStrategy.java
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StandardWebSocketUpgradeStrategy.java
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/*
* Copyright 2002-2022 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.upgrade;
import java.util.Collections;
import java.util.Map;
import java.util.function.Supplier;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.websocket.Endpoint;
import jakarta.websocket.server.ServerContainer;
import jakarta.websocket.server.ServerEndpointConfig;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.reactive.socket.HandshakeInfo;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
import org.springframework.web.reactive.socket.adapter.StandardWebSocketHandlerAdapter;
import org.springframework.web.reactive.socket.adapter.TomcatWebSocketSession;
import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
import org.springframework.web.server.ServerWebExchange;
/**
* A WebSocket {@code RequestUpgradeStrategy} for the Jakarta WebSocket API 2.1+.
*
* <p>This strategy serves as a fallback if no specific server has been detected.
* It can also be used with Jakarta EE 10 level servers such as Tomcat 10.1 and
* Undertow 2.3 directly, relying on their built-in Jakarta WebSocket 2.1 support.
*
* @author Juergen Hoeller
* @author Violeta Georgieva
* @author Rossen Stoyanchev
* @since 6.0
* @see jakarta.websocket.server.ServerContainer#upgradeHttpToWebSocket
*/
public class StandardWebSocketUpgradeStrategy implements RequestUpgradeStrategy {
private static final String SERVER_CONTAINER_ATTR = "jakarta.websocket.server.ServerContainer";
@Nullable
private Long asyncSendTimeout;
@Nullable
private Long maxSessionIdleTimeout;
@Nullable
private Integer maxTextMessageBufferSize;
@Nullable
private Integer maxBinaryMessageBufferSize;
@Nullable
private ServerContainer serverContainer;
/**
* Exposes the underlying config option on
* {@link ServerContainer#setAsyncSendTimeout(long)}.
*/
public void setAsyncSendTimeout(Long timeoutInMillis) {
this.asyncSendTimeout = timeoutInMillis;
}
@Nullable
public Long getAsyncSendTimeout() {
return this.asyncSendTimeout;
}
/**
* Exposes the underlying config option on
* {@link ServerContainer#setDefaultMaxSessionIdleTimeout(long)}.
*/
public void setMaxSessionIdleTimeout(Long timeoutInMillis) {
this.maxSessionIdleTimeout = timeoutInMillis;
}
@Nullable
public Long getMaxSessionIdleTimeout() {
return this.maxSessionIdleTimeout;
}
/**
* Exposes the underlying config option on
* {@link ServerContainer#setDefaultMaxTextMessageBufferSize(int)}.
*/
public void setMaxTextMessageBufferSize(Integer bufferSize) {
this.maxTextMessageBufferSize = bufferSize;
}
@Nullable
public Integer getMaxTextMessageBufferSize() {
return this.maxTextMessageBufferSize;
}
/**
* Exposes the underlying config option on
* {@link ServerContainer#setDefaultMaxBinaryMessageBufferSize(int)}.
*/
public void setMaxBinaryMessageBufferSize(Integer bufferSize) {
this.maxBinaryMessageBufferSize = bufferSize;
}
@Nullable
public Integer getMaxBinaryMessageBufferSize() {
return this.maxBinaryMessageBufferSize;
}
@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory){
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
HttpServletRequest servletRequest = ServerHttpRequestDecorator.getNativeRequest(request);
HttpServletResponse servletResponse = ServerHttpResponseDecorator.getNativeResponse(response);
HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
DataBufferFactory bufferFactory = response.bufferFactory();
// Trigger WebFlux preCommit actions and upgrade
return exchange.getResponse().setComplete()
.then(Mono.deferContextual(contextView -> {
Endpoint endpoint = new StandardWebSocketHandlerAdapter(
ContextWebSocketHandler.decorate(handler, contextView),
session -> new TomcatWebSocketSession(session, handshakeInfo, bufferFactory));
String requestURI = servletRequest.getRequestURI();
DefaultServerEndpointConfig config = new DefaultServerEndpointConfig(requestURI, endpoint);
config.setSubprotocols(subProtocol != null ?
Collections.singletonList(subProtocol) : Collections.emptyList());
try {
upgradeHttpToWebSocket(servletRequest, servletResponse, config, Collections.emptyMap());
}
catch (Exception ex) {
return Mono.error(ex);
}
return Mono.empty();
}));
}
protected void upgradeHttpToWebSocket(HttpServletRequest request, HttpServletResponse response,
ServerEndpointConfig endpointConfig, Map<String,String> pathParams) throws Exception {
getContainer(request).upgradeHttpToWebSocket(request, response, endpointConfig, pathParams);
}
protected ServerContainer getContainer(HttpServletRequest request) {
if (this.serverContainer == null) {
Object container = request.getServletContext().getAttribute(SERVER_CONTAINER_ATTR);
Assert.state(container instanceof ServerContainer,
"ServletContext attribute 'jakarta.websocket.server.ServerContainer' not found.");
this.serverContainer = (ServerContainer) container;
initServerContainer(this.serverContainer);
}
return this.serverContainer;
}
private void initServerContainer(ServerContainer serverContainer) {
if (this.asyncSendTimeout != null) {
serverContainer.setAsyncSendTimeout(this.asyncSendTimeout);
}
if (this.maxSessionIdleTimeout != null) {
serverContainer.setDefaultMaxSessionIdleTimeout(this.maxSessionIdleTimeout);
}
if (this.maxTextMessageBufferSize != null) {
serverContainer.setDefaultMaxTextMessageBufferSize(this.maxTextMessageBufferSize);
}
if (this.maxBinaryMessageBufferSize != null) {
serverContainer.setDefaultMaxBinaryMessageBufferSize(this.maxBinaryMessageBufferSize);
}
}
}