content: /*
   * Latke - 一款以 JSON 为主的 Java Web 框架
   * Copyright (c) 2009-present, b3log.org
   *
   * Latke is licensed under Mulan PSL v2.
   * You can use this software according to the terms and conditions of the Mulan PSL v2.
   * You may obtain a copy of Mulan PSL v2 at:
   *         http://license.coscl.org.cn/MulanPSL2
   * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
   * See the Mulan PSL v2 for more details.
   */
  package org.b3log.latke.http;
  
  import org.apache.commons.lang3.RandomStringUtils;
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.b3log.latke.Latkes;
  import org.b3log.latke.cache.Cache;
  import org.b3log.latke.cache.CacheFactory;
  import org.json.JSONObject;
  
  /**
   * HTTP session utilities.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.0, Nov 3, 2019
   * @since 3.0.0
   */
  public final class Sessions {
  
      private static final Logger LOGGER = LogManager.getLogger(Sessions.class);
  
      public static final Cache CACHE = CacheFactory.getCache("LATKE_SESSIONS");
  
      public static Session add() {
          if (!Latkes.isEnabledSession()) {
              LOGGER.log(Level.WARN, "Session management is disabled");
  
              return null;
          }
  
          final String sessionId = RandomStringUtils.randomAlphanumeric(16);
          final Session ret = new Session(sessionId);
          CACHE.put(sessionId, new JSONObject().put("id", sessionId));
  
          return ret;
      }
  
      public static boolean contains(final String sessionId) {
          return CACHE.contains(sessionId);
      }
  
      public static Session get(String sessionId) {
          final JSONObject session = CACHE.get(sessionId);
          if (null == session) {
              return null;
          }
  
          return new Session(session.optString("id"));
      }
  
      private Sessions() {
      }
  }
  