Merge pull request #16513 from vpavic

* pr/16513:
  Polish "Improve DefaultCookieSerializer auto-configuration"
  Improve DefaultCookieSerializer auto-configuration

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/SessionAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -56,6 +56,7 @@ import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.session.ReactiveSessionRepository;
 import org.springframework.session.Session;
 import org.springframework.session.SessionRepository;
+import org.springframework.session.security.web.authentication.SpringSessionRememberMeServices;
 import org.springframework.session.web.http.CookieHttpSessionIdResolver;
 import org.springframework.session.web.http.CookieSerializer;
 import org.springframework.session.web.http.DefaultCookieSerializer;
@@ -91,8 +92,8 @@ public class SessionAutoConfiguration {
 
 		@Bean
 		@Conditional(DefaultCookieSerializerCondition.class)
-		public DefaultCookieSerializer cookieSerializer(
-				ServerProperties serverProperties) {
+		public DefaultCookieSerializer cookieSerializer(ServerProperties serverProperties,
+				ObjectProvider<SpringSessionRememberMeServices> springSessionRememberMeServices) {
 			Cookie cookie = serverProperties.getServlet().getSession().getCookie();
 			DefaultCookieSerializer cookieSerializer = new DefaultCookieSerializer();
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
@@ -103,6 +104,9 @@ public class SessionAutoConfiguration {
 			map.from(cookie::getSecure).to(cookieSerializer::setUseSecureCookie);
 			map.from(cookie::getMaxAge).to((maxAge) -> cookieSerializer
 					.setCookieMaxAge((int) maxAge.getSeconds()));
+			springSessionRememberMeServices.ifAvailable((
+					rememberMeServices) -> cookieSerializer.setRememberMeRequestAttribute(
+							SpringSessionRememberMeServices.REMEMBER_ME_LOGIN_ATTR));
 			return cookieSerializer;
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/SessionAutoConfigurationTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -34,6 +34,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.session.MapSessionRepository;
 import org.springframework.session.SessionRepository;
 import org.springframework.session.config.annotation.web.http.EnableSpringHttpSession;
+import org.springframework.session.security.web.authentication.SpringSessionRememberMeServices;
 import org.springframework.session.web.http.CookieHttpSessionIdResolver;
 import org.springframework.session.web.http.DefaultCookieSerializer;
 import org.springframework.session.web.http.HeaderHttpSessionIdResolver;
@@ -245,6 +246,19 @@ public class SessionAutoConfigurationTests extends AbstractSessionAutoConfigurat
 						context.getBeansOfType(DefaultCookieSerializer.class)).isEmpty());
 	}
 
+	@Test
+	public void autoConfiguredCookieSerializerIsConfiguredWithRememberMeRequestAttribute() {
+		this.contextRunner
+				.withUserConfiguration(SpringSessionRememberMeServicesConfiguration.class)
+				.run((context) -> {
+					DefaultCookieSerializer cookieSerializer = context
+							.getBean(DefaultCookieSerializer.class);
+					assertThat(cookieSerializer).hasFieldOrPropertyWithValue(
+							"rememberMeRequestAttribute",
+							SpringSessionRememberMeServices.REMEMBER_ME_LOGIN_ATTR);
+				});
+	}
+
 	@Configuration
 	@EnableSpringHttpSession
 	static class SessionRepositoryConfiguration {
@@ -309,4 +323,16 @@ public class SessionAutoConfigurationTests extends AbstractSessionAutoConfigurat
 
 	}
 
+	@Configuration
+	@EnableSpringHttpSession
+	static class SpringSessionRememberMeServicesConfiguration
+			extends SessionRepositoryConfiguration {
+
+		@Bean
+		public SpringSessionRememberMeServices rememberMeServices() {
+			return new SpringSessionRememberMeServices();
+		}
+
+	}
+
 }