Expose localAddress in WebFlux server

Closes gh-24174

spring-web/src/main/java/org/springframework/http/server/reactive/DefaultServerHttpRequestBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -181,9 +181,6 @@ class DefaultServerHttpRequestBuilder implements ServerHttpRequest.Builder {
 
 		private final MultiValueMap<String, HttpCookie> cookies;
 
-		@Nullable
-		private final InetSocketAddress remoteAddress;
-
 		@Nullable
 		private final SslInfo sslInfo;
 
@@ -199,7 +196,6 @@ class DefaultServerHttpRequestBuilder implements ServerHttpRequest.Builder {
 			super(uri, contextPath, headers);
 			this.methodValue = methodValue;
 			this.cookies = cookies;
-			this.remoteAddress = originalRequest.getRemoteAddress();
 			this.sslInfo = sslInfo != null ? sslInfo : originalRequest.getSslInfo();
 			this.body = body;
 			this.originalRequest = originalRequest;
@@ -218,7 +214,13 @@ class DefaultServerHttpRequestBuilder implements ServerHttpRequest.Builder {
 		@Nullable
 		@Override
 		public InetSocketAddress getRemoteAddress() {
-			return this.remoteAddress;
+			return this.originalRequest.getRemoteAddress();
+		}
+
+		@Nullable
+		@Override
+		public InetSocketAddress getLocalAddress() {
+			return this.originalRequest.getLocalAddress();
 		}
 
 		@Nullable

spring-web/src/main/java/org/springframework/http/server/reactive/ReactorServerHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -151,6 +151,11 @@ class ReactorServerHttpRequest extends AbstractServerHttpRequest {
 		return this.request.remoteAddress();
 	}
 
+	@Override
+	public InetSocketAddress getLocalAddress() {
+		return this.request.hostAddress();
+	}
+
 	@Override
 	@Nullable
 	protected SslInfo initSslInfo() {

spring-web/src/main/java/org/springframework/http/server/reactive/ServerHttpRequest.java

@@ -72,6 +72,15 @@ public interface ServerHttpRequest extends HttpRequest, ReactiveHttpInputMessage
 		return null;
 	}
 
+	/**
+	 * Return the local address the request was accepted on, if available.
+	 * 5.2.3
+	 */
+	@Nullable
+	default InetSocketAddress getLocalAddress() {
+		return null;
+	}
+
 	/**
 	 * Return the SSL session information if the request has been transmitted
 	 * over a secure protocol including SSL certificates, if available.

spring-web/src/main/java/org/springframework/http/server/reactive/ServerHttpRequestDecorator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -101,6 +101,11 @@ public class ServerHttpRequestDecorator implements ServerHttpRequest {
 		return getDelegate().getRemoteAddress();
 	}
 
+	@Override
+	public InetSocketAddress getLocalAddress() {
+		return getDelegate().getLocalAddress();
+	}
+
 	@Nullable
 	@Override
 	public SslInfo getSslInfo() {

spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -178,6 +178,11 @@ class ServletServerHttpRequest extends AbstractServerHttpRequest {
 		return new InetSocketAddress(this.request.getRemoteHost(), this.request.getRemotePort());
 	}
 
+	@Override
+	public InetSocketAddress getLocalAddress() {
+		return new InetSocketAddress(this.request.getLocalAddr(), this.request.getLocalPort());
+	}
+
 	@Override
 	@Nullable
 	protected SslInfo initSslInfo() {

spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpRequest.java

@@ -102,6 +102,11 @@ class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 		return this.exchange.getSourceAddress();
 	}
 
+	@Override
+	public InetSocketAddress getLocalAddress() {
+		return this.exchange.getDestinationAddress();
+	}
+
 	@Nullable
 	@Override
 	protected SslInfo initSslInfo() {