Merge pull request #26813 from francislavoie

* pr/26813:
  Polish 'Make livereload websocket headers case insensitive'
  Make livereload websocket headers case insensitive

Closes gh-26813

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/livereload/Connection.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -23,6 +23,7 @@ import java.net.Socket;
 import java.net.SocketTimeoutException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -30,18 +31,20 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.core.log.LogMessage;
+import org.springframework.util.Assert;
 import org.springframework.util.Base64Utils;
 
 /**
  * A {@link LiveReloadServer} connection.
  *
  * @author Phillip Webb
+ * @author Francis Lavoie
  */
 class Connection {
 
 	private static final Log logger = LogFactory.getLog(Connection.class);
 
-	private static final Pattern WEBSOCKET_KEY_PATTERN = Pattern.compile("^Sec-WebSocket-Key:(.*)$", Pattern.MULTILINE);
+	private static final Pattern WEBSOCKET_KEY_PATTERN = Pattern.compile("^sec-websocket-key:(.*)$", Pattern.MULTILINE);
 
 	public static final String WEBSOCKET_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
@@ -68,8 +71,9 @@ class Connection {
 		this.socket = socket;
 		this.inputStream = new ConnectionInputStream(inputStream);
 		this.outputStream = new ConnectionOutputStream(outputStream);
-		this.header = this.inputStream.readHeader();
-		logger.debug(LogMessage.format("Established livereload connection [%s]", this.header));
+		String header = this.inputStream.readHeader();
+		logger.debug(LogMessage.format("Established livereload connection [%s]", header));
+		this.header = header.toLowerCase(Locale.ENGLISH);
 	}
 
 	/**
@@ -77,10 +81,10 @@ class Connection {
 	 * @throws Exception in case of errors
 	 */
 	void run() throws Exception {
-		if (this.header.contains("Upgrade: websocket") && this.header.contains("Sec-WebSocket-Version: 13")) {
+		if (this.header.contains("upgrade: websocket") && this.header.contains("sec-websocket-version: 13")) {
 			runWebSocket();
 		}
-		if (this.header.contains("GET /livereload.js")) {
+		if (this.header.contains("get /livereload.js")) {
 			this.outputStream.writeHttp(getClass().getResourceAsStream("livereload.js"), "text/javascript");
 		}
 	}
@@ -140,9 +144,7 @@ class Connection {
 
 	private String getWebsocketAcceptResponse() throws NoSuchAlgorithmException {
 		Matcher matcher = WEBSOCKET_KEY_PATTERN.matcher(this.header);
-		if (!matcher.find()) {
-			throw new IllegalStateException("No Sec-WebSocket-Key");
-		}
+		Assert.state(matcher.find(), "No Sec-WebSocket-Key");
 		String response = matcher.group(1).trim() + WEBSOCKET_GUID;
 		MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
 		messageDigest.update(response.getBytes(), 0, response.length());

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/livereload/LiveReloadServerTests.java

@@ -19,13 +19,27 @@ package org.springframework.boot.devtools.livereload;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
 import java.net.URI;
+import java.net.UnknownHostException;
 import java.time.Duration;
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.Callable;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import javax.websocket.ClientEndpointConfig;
+import javax.websocket.ClientEndpointConfig.Configurator;
+import javax.websocket.Endpoint;
+import javax.websocket.HandshakeResponse;
+import javax.websocket.WebSocketContainer;
 
 import org.apache.tomcat.websocket.WsWebSocketContainer;
 import org.awaitility.Awaitility;
@@ -34,13 +48,20 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.http.HttpHeaders;
+import org.springframework.util.concurrent.ListenableFuture;
 import org.springframework.web.client.RestTemplate;
 import org.springframework.web.socket.CloseStatus;
 import org.springframework.web.socket.PingMessage;
 import org.springframework.web.socket.PongMessage;
 import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketExtension;
+import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.WebSocketMessage;
 import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter;
+import org.springframework.web.socket.adapter.standard.StandardWebSocketSession;
+import org.springframework.web.socket.adapter.standard.WebSocketToStandardExtensionAdapter;
 import org.springframework.web.socket.client.WebSocketClient;
 import org.springframework.web.socket.client.standard.StandardWebSocketClient;
 import org.springframework.web.socket.handler.TextWebSocketHandler;
@@ -94,7 +115,16 @@ class LiveReloadServerTests {
 				(msgs) -> msgs.size() == 2);
 		assertThat(messages.get(0)).contains("http://livereload.com/protocols/official-7");
 		assertThat(messages.get(1)).contains("command\":\"reload\"");
+	}
 
+	@Test // gh-26813
+	void triggerReloadWithUppercaseHeaders() throws Exception {
+		LiveReloadWebSocketHandler handler = connect(UppercaseWebSocketClient::new);
+		this.server.triggerReload();
+		List<String> messages = await().atMost(Duration.ofSeconds(10)).until(handler::getMessages,
+				(msgs) -> msgs.size() == 2);
+		assertThat(messages.get(0)).contains("http://livereload.com/protocols/official-7");
+		assertThat(messages.get(1)).contains("command\":\"reload\"");
 	}
 
 	@Test
@@ -126,7 +156,13 @@ class LiveReloadServerTests {
 	}
 
 	private LiveReloadWebSocketHandler connect() throws Exception {
-		WebSocketClient client = new StandardWebSocketClient(new WsWebSocketContainer());
+		return connect(StandardWebSocketClient::new);
+	}
+
+	private LiveReloadWebSocketHandler connect(Function<WebSocketContainer, WebSocketClient> clientFactory)
+			throws Exception {
+		WsWebSocketContainer webSocketContainer = new WsWebSocketContainer();
+		WebSocketClient client = clientFactory.apply(webSocketContainer);
 		LiveReloadWebSocketHandler handler = new LiveReloadWebSocketHandler();
 		client.doHandshake(handler, "ws://localhost:" + this.port + "/livereload");
 		handler.awaitHello();
@@ -246,4 +282,69 @@ class LiveReloadServerTests {
 
 	}
 
+	static class UppercaseWebSocketClient extends StandardWebSocketClient {
+
+		private final WebSocketContainer webSocketContainer;
+
+		UppercaseWebSocketClient(WebSocketContainer webSocketContainer) {
+			super(webSocketContainer);
+			this.webSocketContainer = webSocketContainer;
+		}
+
+		@Override
+		protected ListenableFuture<WebSocketSession> doHandshakeInternal(WebSocketHandler webSocketHandler,
+				HttpHeaders headers, URI uri, List<String> protocols, List<WebSocketExtension> extensions,
+				Map<String, Object> attributes) {
+			InetSocketAddress localAddress = new InetSocketAddress(getLocalHost(), uri.getPort());
+			InetSocketAddress remoteAddress = new InetSocketAddress(uri.getHost(), uri.getPort());
+			StandardWebSocketSession session = new StandardWebSocketSession(headers, attributes, localAddress,
+					remoteAddress);
+			ClientEndpointConfig endpointConfig = ClientEndpointConfig.Builder.create()
+					.configurator(new UppercaseWebSocketClientConfigurator(headers)).preferredSubprotocols(protocols)
+					.extensions(extensions.stream().map(WebSocketToStandardExtensionAdapter::new)
+							.collect(Collectors.toList()))
+					.build();
+			endpointConfig.getUserProperties().putAll(getUserProperties());
+			Endpoint endpoint = new StandardWebSocketHandlerAdapter(webSocketHandler, session);
+			Callable<WebSocketSession> connectTask = () -> {
+				this.webSocketContainer.connectToServer(endpoint, endpointConfig, uri);
+				return session;
+			};
+			return getTaskExecutor().submitListenable(connectTask);
+		}
+
+		private InetAddress getLocalHost() {
+			try {
+				return InetAddress.getLocalHost();
+			}
+			catch (UnknownHostException ex) {
+				return InetAddress.getLoopbackAddress();
+			}
+		}
+
+	}
+
+	private static class UppercaseWebSocketClientConfigurator extends Configurator {
+
+		private final HttpHeaders headers;
+
+		UppercaseWebSocketClientConfigurator(HttpHeaders headers) {
+			this.headers = headers;
+		}
+
+		@Override
+		public void beforeRequest(Map<String, List<String>> requestHeaders) {
+			Map<String, List<String>> uppercaseRequestHeaders = new LinkedHashMap<>();
+			requestHeaders.forEach((key, value) -> uppercaseRequestHeaders.put(key.toUpperCase(), value));
+			requestHeaders.clear();
+			requestHeaders.putAll(uppercaseRequestHeaders);
+			requestHeaders.putAll(this.headers);
+		}
+
+		@Override
+		public void afterResponse(HandshakeResponse response) {
+		}
+
+	}
+
 }