Add auto-config for Spring Session cookie serializer

This commit adds support for auto-configuring Spring Session's `DefaultCookieSerializer` using `ServerProperties`.

Author: vpavic

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

@@ -35,14 +35,19 @@
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
 import org.springframework.boot.autoconfigure.session.SessionAutoConfiguration.SessionRepositoryConfiguration;
 import org.springframework.boot.autoconfigure.session.SessionAutoConfiguration.SessionRepositoryValidator;
+import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.context.annotation.ImportSelector;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.session.Session;
 import org.springframework.session.SessionRepository;
+import org.springframework.session.web.http.CookieSerializer;
+import org.springframework.session.web.http.DefaultCookieSerializer;
+import org.springframework.session.web.http.HttpSessionStrategy;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Spring Session.
@@ -57,14 +62,47 @@
 @Configuration
 @ConditionalOnClass(Session.class)
 @ConditionalOnWebApplication(type = Type.SERVLET)
-@EnableConfigurationProperties(SessionProperties.class)
+@EnableConfigurationProperties({ ServerProperties.class, SessionProperties.class })
 @AutoConfigureAfter({ DataSourceAutoConfiguration.class, HazelcastAutoConfiguration.class,
 		JdbcTemplateAutoConfiguration.class, MongoAutoConfiguration.class,
 		RedisAutoConfiguration.class })
 @Import({ SessionRepositoryConfiguration.class, SessionRepositoryValidator.class,
 		SessionRepositoryFilterConfiguration.class })
 public class SessionAutoConfiguration {
 
+	private final ServerProperties serverProperties;
+
+	public SessionAutoConfiguration(ServerProperties serverProperties) {
+		this.serverProperties = serverProperties;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean({ CookieSerializer.class, HttpSessionStrategy.class })
+	public DefaultCookieSerializer cookieSerializer() {
+		ServerProperties.Session.Cookie cookie = this.serverProperties.getSession()
+				.getCookie();
+		DefaultCookieSerializer cookieSerializer = new DefaultCookieSerializer();
+		if (cookie.getName() != null) {
+			cookieSerializer.setCookieName(cookie.getName());
+		}
+		if (cookie.getDomain() != null) {
+			cookieSerializer.setDomainName(cookie.getDomain());
+		}
+		if (cookie.getPath() != null) {
+			cookieSerializer.setCookiePath(cookie.getPath());
+		}
+		if (cookie.getHttpOnly() != null) {
+			cookieSerializer.setUseHttpOnlyCookie(cookie.getHttpOnly());
+		}
+		if (cookie.getSecure() != null) {
+			cookieSerializer.setUseSecureCookie(cookie.getSecure());
+		}
+		if (cookie.getMaxAge() != null) {
+			cookieSerializer.setCookieMaxAge(cookie.getMaxAge());
+		}
+		return cookieSerializer;
+	}
+
 	@Configuration
 	@ConditionalOnMissingBean(SessionRepository.class)
 	@Import({ SessionRepositoryImplementationValidator.class,

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

@@ -32,6 +32,8 @@
 import org.springframework.session.MapSessionRepository;
 import org.springframework.session.SessionRepository;
 import org.springframework.session.config.annotation.web.http.EnableSpringHttpSession;
+import org.springframework.session.web.http.DefaultCookieSerializer;
+import org.springframework.session.web.http.HeaderHttpSessionStrategy;
 import org.springframework.session.web.http.SessionRepositoryFilter;
 import org.springframework.test.util.ReflectionTestUtils;
 
@@ -147,6 +149,39 @@ public void filterDispatcherTypesCanBeCustomized() {
 				});
 	}
 
+	@Test
+	public void autoConfiguredCookieSerializerConfiguration() {
+		this.contextRunner.withUserConfiguration(SessionRepositoryConfiguration.class)
+				.withPropertyValues("server.session.cookie.name=sid").run((context) -> {
+					DefaultCookieSerializer cookieSerializer = context
+							.getBean(DefaultCookieSerializer.class);
+					assertThat(
+							ReflectionTestUtils.getField(cookieSerializer, "cookieName"))
+									.isEqualTo("sid");
+				});
+	}
+
+	@Test
+	public void userProvidedCookieSerializerConfiguration() {
+		this.contextRunner
+				.withUserConfiguration(UserProvidedCookieSerializerConfiguration.class)
+				.withPropertyValues("server.session.cookie.name=sid").run((context) -> {
+					DefaultCookieSerializer cookieSerializer = context
+							.getBean(DefaultCookieSerializer.class);
+					assertThat(
+							ReflectionTestUtils.getField(cookieSerializer, "cookieName"))
+									.isEqualTo("SESSION");
+				});
+	}
+
+	@Test
+	public void userProvidedHttpSessionStrategyConfiguration() {
+		this.contextRunner
+				.withUserConfiguration(UserProvidedHttpSessionStrategyConfiguration.class)
+				.run((context) -> assertThat(
+						context.getBeansOfType(DefaultCookieSerializer.class)).isEmpty());
+	}
+
 	@Configuration
 	@EnableSpringHttpSession
 	static class SessionRepositoryConfiguration {
@@ -158,4 +193,28 @@ public MapSessionRepository mySessionRepository() {
 
 	}
 
+	@Configuration
+	@EnableSpringHttpSession
+	static class UserProvidedCookieSerializerConfiguration
+			extends SessionRepositoryConfiguration {
+
+		@Bean
+		public DefaultCookieSerializer myCookieSerializer() {
+			return new DefaultCookieSerializer();
+		}
+
+	}
+
+	@Configuration
+	@EnableSpringHttpSession
+	static class UserProvidedHttpSessionStrategyConfiguration
+			extends SessionRepositoryConfiguration {
+
+		@Bean
+		public HeaderHttpSessionStrategy httpSessionStrategy() {
+			return new HeaderHttpSessionStrategy();
+		}
+
+	}
+
 }