Support Jetty WebSocket server parameters

Closes gh-30344

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -25,6 +25,7 @@ import java.util.Map;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
+import jakarta.servlet.ServletContext;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import reactor.core.publisher.Mono;
@@ -39,6 +40,7 @@ import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
+import org.springframework.web.context.ServletContextAware;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
 import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
@@ -63,7 +65,7 @@ import org.springframework.web.server.ServerWebInputException;
  * @author Juergen Hoeller
  * @since 5.0
  */
-public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
+public class HandshakeWebSocketService implements WebSocketService, ServletContextAware, Lifecycle {
 
 	private static final String SEC_WEBSOCKET_KEY = "Sec-WebSocket-Key";
 
@@ -99,6 +101,7 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 
 	private static final Log logger = LogFactory.getLog(HandshakeWebSocketService.class);
 
+
 	private final RequestUpgradeStrategy upgradeStrategy;
 
 	@Nullable
@@ -154,6 +157,13 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 		return this.sessionAttributePredicate;
 	}
 
+	@Override
+	public void setServletContext(ServletContext servletContext) {
+		if (getUpgradeStrategy() instanceof ServletContextAware servletContextAware) {
+			servletContextAware.setServletContext(servletContext);
+		}
+	}
+
 
 	@Override
 	public void start() {

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/WebSocketHandlerAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -16,11 +16,13 @@
 
 package org.springframework.web.reactive.socket.server.support;
 
+import jakarta.servlet.ServletContext;
 import reactor.core.publisher.Mono;
 
 import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.Ordered;
 import org.springframework.util.Assert;
+import org.springframework.web.context.ServletContextAware;
 import org.springframework.web.reactive.HandlerAdapter;
 import org.springframework.web.reactive.HandlerResult;
 import org.springframework.web.reactive.socket.WebSocketHandler;
@@ -47,7 +49,7 @@ import org.springframework.web.server.ServerWebExchange;
  * @since 5.0
  */
 @ImportRuntimeHints(HandshakeWebSocketServiceRuntimeHints.class)
-public class WebSocketHandlerAdapter implements HandlerAdapter, Ordered {
+public class WebSocketHandlerAdapter implements HandlerAdapter, ServletContextAware, Ordered {
 
 	private final WebSocketService webSocketService;
 
@@ -97,6 +99,13 @@ public class WebSocketHandlerAdapter implements HandlerAdapter, Ordered {
 		return this.webSocketService;
 	}
 
+	@Override
+	public void setServletContext(ServletContext servletContext) {
+		if (this.webSocketService instanceof ServletContextAware servletContextAware) {
+			servletContextAware.setServletContext(servletContext);
+		}
+	}
+
 
 	@Override
 	public boolean supports(Object handler) {

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java

@@ -16,6 +16,7 @@
 
 package org.springframework.web.reactive.socket.server.upgrade;
 
+import java.util.function.Consumer;
 import java.util.function.Supplier;
 
 import jakarta.servlet.ServletContext;
@@ -23,6 +24,7 @@ import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import org.eclipse.jetty.ee10.websocket.server.JettyWebSocketCreator;
 import org.eclipse.jetty.ee10.websocket.server.JettyWebSocketServerContainer;
+import org.eclipse.jetty.websocket.api.Configurable;
 import reactor.core.publisher.Mono;
 
 import org.springframework.core.io.buffer.DataBufferFactory;
@@ -31,6 +33,7 @@ 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.web.context.ServletContextAware;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
 import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
@@ -45,7 +48,30 @@ import org.springframework.web.server.ServerWebExchange;
  * @author Rossen Stoyanchev
  * @since 5.3.4
  */
-public class JettyRequestUpgradeStrategy implements RequestUpgradeStrategy {
+public class JettyRequestUpgradeStrategy implements RequestUpgradeStrategy, ServletContextAware {
+
+	@Nullable
+	private Consumer<Configurable> webSocketConfigurer;
+
+
+	/**
+	 * Add a callback to configure WebSocket server parameters on
+	 * {@link JettyWebSocketServerContainer}.
+	 * @since 6.1.0
+	 */
+	public void addWebSocketConfigurer(Consumer<Configurable> webSocketConfigurer) {
+		this.webSocketConfigurer = (this.webSocketConfigurer != null ?
+				this.webSocketConfigurer.andThen(webSocketConfigurer) : webSocketConfigurer);
+	}
+
+	@Override
+	public void setServletContext(ServletContext servletContext) {
+		JettyWebSocketServerContainer container = JettyWebSocketServerContainer.getContainer(servletContext);
+		if (container != null && this.webSocketConfigurer != null) {
+			this.webSocketConfigurer.accept(container);
+		}
+	}
+
 
 	@Override
 	public Mono<Void> upgrade(