net.identio.server.service.usersession.UserSessionService.java Source code

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Here is the source code for net.identio.server.service.usersession.UserSessionService.java

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/*
 * This file is part of Ident.io.
 *
 * Ident.io - A flexible authentication server
 * Copyright (c) 2017 Loeiz TANGUY
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package net.identio.server.service.usersession;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import net.identio.server.model.UserSession;
import net.identio.server.utils.SecurityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

import javax.annotation.Nonnull;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

@Service
@Scope("singleton")
public class UserSessionService {

    private static final Logger LOG = LoggerFactory.getLogger(UserSessionService.class);
    private static final int SESSION_IDENTIFIER_LENGTH = 100;

    private LoadingCache<String, UserSession> sessionCache;

    @Autowired
    public UserSessionService(UserSessionConfiguration config) {

        LOG.debug("Initializing in-memory session service");

        sessionCache = CacheBuilder.newBuilder().maximumSize(100000)
                .expireAfterAccess(config.getDuration(), TimeUnit.MINUTES)
                .build(new CacheLoader<String, UserSession>() {
                    public UserSession load(@Nonnull String o) {
                        return new UserSession();
                    }
                });

        LOG.debug("* Successfully created session cache");
    }

    public UserSession createUserSession() {
        LOG.debug("Creating new session");

        String sessionId = SecurityUtils.generateSecureIdentifier(SESSION_IDENTIFIER_LENGTH);

        UserSession session = new UserSession();
        session.setId(sessionId);
        sessionCache.put(sessionId, session);

        LOG.debug("New session generated {}", sessionId);

        return session;
    }

    public UserSession getUserSession(String sessionId) {

        UserSession userSession = null;

        if (sessionId != null) {

            LOG.debug("Fetch session {} in cache", sessionId);

            try {
                userSession = sessionCache.get(sessionId);
            } catch (ExecutionException ex) {
                LOG.error("An error occured when loading session from cache: {}", ex.getMessage());
                LOG.debug("* Detailed Stacktrace: ", ex);
            }
        }

        // Check that the session still exists. If not, we create a new one
        if (userSession == null || userSession.getId() == null) {

            LOG.debug("No existing session found");

            userSession = createUserSession();
        }

        return userSession;
    }

    public void removeUserSession(String userSessionId) {

        LOG.debug("Remove session {} from cache", userSessionId);

        sessionCache.invalidate(userSessionId);

    }
}