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/*
 * Copyright 2012-2023 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
 *
 *      https://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.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.context.properties.PropertyMapper;
import org.springframework.boot.context.properties.source.InvalidConfigurationPropertyValueException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.session.SessionRepository;
import org.springframework.session.config.SessionRepositoryCustomizer;
import org.springframework.session.data.redis.RedisIndexedSessionRepository;
import org.springframework.session.data.redis.RedisSessionRepository;
import org.springframework.session.data.redis.config.ConfigureNotifyKeyspaceEventsAction;
import org.springframework.session.data.redis.config.ConfigureRedisAction;
import org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration;
import org.springframework.session.data.redis.config.annotation.web.http.RedisIndexedHttpSessionConfiguration;

/**
 * Redis backed session configuration.
 *
 * @author Andy Wilkinson
 * @author Tommy Ludwig
 * @author Eddú Meléndez
 * @author Stephane Nicoll
 * @author Vedran Pavic
 */
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass({ RedisTemplate.class, RedisIndexedSessionRepository.class })
@ConditionalOnMissingBean(SessionRepository.class)
@ConditionalOnBean(RedisConnectionFactory.class)
@EnableConfigurationProperties(RedisSessionProperties.class)
class RedisSessionConfiguration {

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnProperty(prefix = "spring.session.redis", name = "repository-type", havingValue = "default",
			matchIfMissing = true)
	@Import(RedisHttpSessionConfiguration.class)
	static class DefaultRedisSessionConfiguration {

		@Bean
		SessionRepositoryCustomizer springBootSessionRepositoryCustomizer(
				SessionProperties sessionProperties, RedisSessionProperties redisSessionProperties,
				ServerProperties serverProperties) {
			String cleanupCron = redisSessionProperties.getCleanupCron();
			if (cleanupCron != null) {
				throw new InvalidConfigurationPropertyValueException("spring.session.redis.cleanup-cron", cleanupCron,
						"Cron-based cleanup is only supported when "
								+ "spring.session.redis.repository-type is set to indexed.");
			}
			return (sessionRepository) -> {
				PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
				map.from(sessionProperties
					.determineTimeout(() -> serverProperties.getServlet().getSession().getTimeout()))
					.to(sessionRepository::setDefaultMaxInactiveInterval);
				map.from(redisSessionProperties::getNamespace).to(sessionRepository::setRedisKeyNamespace);
				map.from(redisSessionProperties::getFlushMode).to(sessionRepository::setFlushMode);
				map.from(redisSessionProperties::getSaveMode).to(sessionRepository::setSaveMode);
			};
		}

	}

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnProperty(prefix = "spring.session.redis", name = "repository-type", havingValue = "indexed")
	@Import(RedisIndexedHttpSessionConfiguration.class)
	static class IndexedRedisSessionConfiguration {

		@Bean
		@ConditionalOnMissingBean
		ConfigureRedisAction configureRedisAction(RedisSessionProperties redisSessionProperties) {
			return switch (redisSessionProperties.getConfigureAction()) {
				case NOTIFY_KEYSPACE_EVENTS -> new ConfigureNotifyKeyspaceEventsAction();
				case NONE -> ConfigureRedisAction.NO_OP;
			};
		}

		@Bean
		SessionRepositoryCustomizer springBootSessionRepositoryCustomizer(
				SessionProperties sessionProperties, RedisSessionProperties redisSessionProperties,
				ServerProperties serverProperties) {
			return (sessionRepository) -> {
				PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
				map.from(sessionProperties
					.determineTimeout(() -> serverProperties.getServlet().getSession().getTimeout()))
					.to(sessionRepository::setDefaultMaxInactiveInterval);
				map.from(redisSessionProperties::getNamespace).to(sessionRepository::setRedisKeyNamespace);
				map.from(redisSessionProperties::getFlushMode).to(sessionRepository::setFlushMode);
				map.from(redisSessionProperties::getSaveMode).to(sessionRepository::setSaveMode);
				map.from(redisSessionProperties::getCleanupCron).to(sessionRepository::setCleanupCron);
			};
		}

	}

}




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