Add auto-configuration for separate Spring Session Data MongoDB module

Closes gh-9552

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

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.session;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Conditional;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.session.SessionRepository;
+import org.springframework.session.data.mongo.config.annotation.web.http.MongoHttpSessionConfiguration;
+
+/**
+ * Mongo-backed session configuration.
+ *
+ * @author Eddú Meléndez
+ * @author Stephane Nicoll
+ */
+@Configuration
+@ConditionalOnMissingBean(SessionRepository.class)
+@ConditionalOnBean(MongoOperations.class)
+@Conditional(SessionCondition.class)
+@EnableConfigurationProperties(MongoSessionProperties.class)
+class MongoSessionConfiguration {
+
+	@Configuration
+	public static class SpringBootMongoHttpSessionConfiguration
+			extends MongoHttpSessionConfiguration {
+
+		@Autowired
+		public void customize(SessionProperties sessionProperties,
+				MongoSessionProperties mongoSessionProperties) {
+			Integer timeout = sessionProperties.getTimeout();
+			if (timeout != null) {
+				setMaxInactiveIntervalInSeconds(timeout);
+			}
+			setCollectionName(mongoSessionProperties.getCollectionName());
+		}
+
+	}
+
+}

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

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.session;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Configuration properties for Mongo-backed Spring Session.
+ *
+ * @author Andy Wilkinson
+ * @since 2.0.0
+ */
+@ConfigurationProperties(prefix = "spring.session.mongo")
+public class MongoSessionProperties {
+
+	/**
+	 * Collection name used to store sessions.
+	 */
+	private String collectionName = "sessions";
+
+	public String getCollectionName() {
+		return this.collectionName;
+	}
+
+	public void setCollectionName(String collectionName) {
+		this.collectionName = collectionName;
+	}
+
+}

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

@@ -32,6 +32,7 @@ import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
 import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration;
+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.context.properties.EnableConfigurationProperties;
@@ -58,7 +59,8 @@ import org.springframework.session.SessionRepository;
 @ConditionalOnWebApplication(type = Type.SERVLET)
 @EnableConfigurationProperties(SessionProperties.class)
 @AutoConfigureAfter({ DataSourceAutoConfiguration.class, HazelcastAutoConfiguration.class,
-		JdbcTemplateAutoConfiguration.class, RedisAutoConfiguration.class })
+		JdbcTemplateAutoConfiguration.class, MongoAutoConfiguration.class,
+		RedisAutoConfiguration.class })
 @Import({ SessionRepositoryConfiguration.class, SessionRepositoryValidator.class,
 		SessionRepositoryFilterConfiguration.class })
 public class SessionAutoConfiguration {

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

@@ -35,6 +35,7 @@ final class SessionStoreMappings {
 	static {
 		Map<StoreType, Class<?>> mappings = new HashMap<>();
 		mappings.put(StoreType.REDIS, RedisSessionConfiguration.class);
+		mappings.put(StoreType.MONGO, MongoSessionConfiguration.class);
 		mappings.put(StoreType.JDBC, JdbcSessionConfiguration.class);
 		mappings.put(StoreType.HAZELCAST, HazelcastSessionConfiguration.class);
 		mappings.put(StoreType.NONE, NoOpSessionConfiguration.class);

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

@@ -31,6 +31,11 @@ public enum StoreType {
 	 */
 	REDIS,
 
+	/**
+	 * Mongo backed sessions.
+	 */
+	MONGO,
+
 	/**
 	 * JDBC backed sessions.
 	 */