Add remoteAddress() to ServerRequest

Issue: SPR-16681

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/DefaultServerRequest.java

@@ -116,6 +116,11 @@ class DefaultServerRequest implements ServerRequest {
 		return request().getCookies();
 	}
 
+	@Override
+	public Optional<InetSocketAddress> remoteAddress() {
+		return Optional.ofNullable(request().getRemoteAddress());
+	}
+
 	@Override
 	public <T> T body(BodyExtractor<T, ? super ServerHttpRequest> extractor) {
 		return body(extractor, Collections.emptyMap());

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java

@@ -16,6 +16,7 @@
 
 package org.springframework.web.reactive.function.server;
 
+import java.net.InetSocketAddress;
 import java.net.URI;
 import java.security.Principal;
 import java.util.ArrayList;
@@ -513,6 +514,11 @@ public abstract class RequestPredicates {
 			return this.request.cookies();
 		}
 
+		@Override
+		public Optional<InetSocketAddress> remoteAddress() {
+			return this.request.remoteAddress();
+		}
+
 		@Override
 		public <T> T body(BodyExtractor<T, ? super ServerHttpRequest> extractor) {
 			return this.request.body(extractor);

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerRequest.java

@@ -114,6 +114,12 @@ public interface ServerRequest {
 	 */
 	MultiValueMap<String, HttpCookie> cookies();
 
+	/**
+	 * Return the remote address where this request is connected to, if available.
+	 * @since 5.1
+	 */
+	Optional<InetSocketAddress> remoteAddress();
+
 	/**
 	 * Extract the body with the given {@code BodyExtractor}.
 	 * @param extractor the {@code BodyExtractor} that reads from the request

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/support/ServerRequestWrapper.java

@@ -116,6 +116,11 @@ public class ServerRequestWrapper implements ServerRequest {
 		return this.delegate.cookies();
 	}
 
+	@Override
+	public Optional<InetSocketAddress> remoteAddress() {
+		return this.delegate.remoteAddress();
+	}
+
 	@Override
 	public <T> T body(BodyExtractor<T, ? super ServerHttpRequest> extractor) {
 		return this.delegate.body(extractor);