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/*
 * Copyright 2012-2018 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 java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.convert.DurationUnit;
import org.springframework.boot.web.servlet.DispatcherType;
import org.springframework.boot.web.servlet.server.Session;
import org.springframework.session.web.http.SessionRepositoryFilter;

/**
 * Configuration properties for Spring Session.
 *
 * @author Tommy Ludwig
 * @author Stephane Nicoll
 * @author Vedran Pavic
 * @since 1.4.0
 */
@ConfigurationProperties(prefix = "spring.session")
public class SessionProperties {

	/**
	 * Session store type.
	 */
	private StoreType storeType;

	/**
	 * Session timeout. If a duration suffix is not specified, seconds will be used.
	 */
	@DurationUnit(ChronoUnit.SECONDS)
	private Duration timeout;

	private Servlet servlet = new Servlet();

	private final ServerProperties serverProperties;

	public SessionProperties(ObjectProvider serverProperties) {
		this.serverProperties = serverProperties.getIfUnique();
	}

	@PostConstruct
	public void checkSessionTimeout() {
		if (this.timeout == null && this.serverProperties != null) {
			this.timeout = this.serverProperties.getServlet().getSession().getTimeout();
		}
	}

	public StoreType getStoreType() {
		return this.storeType;
	}

	public void setStoreType(StoreType storeType) {
		this.storeType = storeType;
	}

	/**
	 * Return the session timeout.
	 * @return the session timeout
	 * @see Session#getTimeout()
	 */
	public Duration getTimeout() {
		return this.timeout;
	}

	public void setTimeout(Duration timeout) {
		this.timeout = timeout;
	}

	public Servlet getServlet() {
		return this.servlet;
	}

	public void setServlet(Servlet servlet) {
		this.servlet = servlet;
	}

	/**
	 * Servlet-related properties.
	 */
	public static class Servlet {

		/**
		 * Session repository filter order.
		 */
		private int filterOrder = SessionRepositoryFilter.DEFAULT_ORDER;

		/**
		 * Session repository filter dispatcher types.
		 */
		private Set filterDispatcherTypes = new HashSet<>(Arrays.asList(
				DispatcherType.ASYNC, DispatcherType.ERROR, DispatcherType.REQUEST));

		public int getFilterOrder() {
			return this.filterOrder;
		}

		public void setFilterOrder(int filterOrder) {
			this.filterOrder = filterOrder;
		}

		public Set getFilterDispatcherTypes() {
			return this.filterDispatcherTypes;
		}

		public void setFilterDispatcherTypes(Set filterDispatcherTypes) {
			this.filterDispatcherTypes = filterDispatcherTypes;
		}

	}

}