/**
 * <p>
 * 服務實現(xiàn)類
 * </p>
 *
 * @author z77z
 * @since 2017-02-10
 */
@Service
public class SysUserService extends ServiceImpl<SysUserMapper, SysUser> {
  @Autowired
  RedisSessionDAO redisSessionDAO;

  public Page<UserOnlineBo> getPagePlus(FrontPage<UserOnlineBo> frontPage) {
    // 因為我們是用redis實現(xiàn)了shiro的session的Dao,而且是采用了shiro+redis這個插件
    // 所以從spring容器中獲取redisSessionDAO
    // 來獲取session列表.
    Collection<Session> sessions = redisSessionDAO.getActiveSessions();
    Iterator<Session> it = sessions.iterator();
    List<UserOnlineBo> onlineUserList = new ArrayList<UserOnlineBo>();
    Page<UserOnlineBo> pageList = frontPage.getPagePlus();
    // 遍歷session
    while (it.hasNext()) {
      // 這是shiro已經(jīng)存入session的
      // 現(xiàn)在直接取就是了
      Session session = it.next();
      // 如果被標記為踢出就不顯示
      Object obj = session.getAttribute("kickout");
      if (obj != null)
        continue;
      UserOnlineBo onlineUser = getSessionBo(session);
      onlineUserList.add(onlineUser);
    }
    // 再將List<UserOnlineBo>轉(zhuǎn)換成mybatisPlus封裝的page對象
    int page = frontPage.getPage() - 1;
    int rows = frontPage.getRows() - 1;
    int startIndex = page * rows;
    int endIndex = (page * rows) + rows;
    int size = onlineUserList.size();
    if (endIndex > size) {
      endIndex = size;
    }
    pageList.setRecords(onlineUserList.subList(startIndex, endIndex));
    pageList.setTotal(size);
    return pageList;
  }
  //從session中獲取UserOnline對象
  private UserOnlineBo getSessionBo(Session session){
    //獲取session登錄信息。
    Object obj = session.getAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
    if(null == obj){
      return null;
    }
    //確保是 SimplePrincipalCollection對象。
    if(obj instanceof SimplePrincipalCollection){
      SimplePrincipalCollection spc = (SimplePrincipalCollection)obj;
      /**
       * 獲取用戶登錄的，@link SampleRealm.doGetAuthenticationInfo(...)方法中
       * return new SimpleAuthenticationInfo(user,user.getPswd(), getName());的user 對象。
       */
      obj = spc.getPrimaryPrincipal();
      if(null != obj && obj instanceof SysUser){
        //存儲session + user 綜合信息
        UserOnlineBo userBo = new UserOnlineBo((SysUser)obj);
        //最后一次和系統(tǒng)交互的時間
        userBo.setLastAccess(session.getLastAccessTime());
        //主機的ip地址
        userBo.setHost(session.getHost());
        //session ID
        userBo.setSessionId(session.getId().toString());
        //session最后一次與系統(tǒng)交互的時間
        userBo.setLastLoginTime(session.getLastAccessTime());
        //回話到期 ttl(ms)
        userBo.setTimeout(session.getTimeout());
        //session創(chuàng)建時間
        userBo.setStartTime(session.getStartTimestamp());
        //是否踢出
        userBo.setSessionStatus(false);
        return userBo;
      }
    }
    return null;
  }
}

Map<String, String> resultMap = new HashMap<String, String>();
//判斷是不是Ajax請求
if ("XMLHttpRequest".equalsIgnoreCase(((HttpServletRequest) request).getHeader("X-Requested-With"))) {
  resultMap.put("user_status", "300");
  resultMap.put("message", "您已經(jīng)在其他地方登錄，請重新登錄！");
  //輸出json串
  out(response, resultMap);
}else{
  //重定向
  WebUtils.issueRedirect(request, response, kickoutUrl);
}

private void out(ServletResponse hresponse, Map<String, String> resultMap)
  throws IOException {
  try {
    hresponse.setCharacterEncoding("UTF-8");
    PrintWriter out = hresponse.getWriter();
    out.println(JSON.toJSONString(resultMap));
    out.flush();
    out.close();
  } catch (Exception e) {
    System.err.println("KickoutSessionFilter.class 輸出JSON異常，可以忽略。");
  }
}

/**
 * DES加密解密
 * 
 * @author z77z
 * @datetime 2017-3-13
 */
public class MyDES {
  /**
   * DES算法密鑰
   */
  private static final byte[] DES_KEY = { 21, 1, -110, 82, -32, -85, -128, -65 };

  /**
   * 數(shù)據(jù)加密，算法（DES）
   * 
   * @param data
   *      要進行加密的數(shù)據(jù)
   * @return 加密后的數(shù)據(jù)
   */
  @SuppressWarnings("restriction")
  public static String encryptBasedDes(String data) {
    String encryptedData = null;
    try {
      // DES算法要求有一個可信任的隨機數(shù)源
      SecureRandom sr = new SecureRandom();
      DESKeySpec deskey = new DESKeySpec(DES_KEY);
      // 創(chuàng)建一個密匙工廠，然后用它把DESKeySpec轉(zhuǎn)換成一個SecretKey對象
      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
      SecretKey key = keyFactory.generateSecret(deskey);
      // 加密對象
      Cipher cipher = Cipher.getInstance("DES");
      cipher.init(Cipher.ENCRYPT_MODE, key, sr);
      // 加密，并把字節(jié)數(shù)組編碼成字符串
      encryptedData = new sun.misc.BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
    } catch (Exception e) {
      // log.error("加密錯誤，錯誤信息：", e);
      throw new RuntimeException("加密錯誤，錯誤信息：", e);
    }
    return encryptedData;
  }

  /**
   * 數(shù)據(jù)解密，算法（DES）
   * 
   * @param cryptData
   *      加密數(shù)據(jù)
   * @return 解密后的數(shù)據(jù)
   */
  @SuppressWarnings("restriction")
  public static String decryptBasedDes(String cryptData) {
    String decryptedData = null;
    try {
      // DES算法要求有一個可信任的隨機數(shù)源
      SecureRandom sr = new SecureRandom();
      DESKeySpec deskey = new DESKeySpec(DES_KEY);
      // 創(chuàng)建一個密匙工廠，然后用它把DESKeySpec轉(zhuǎn)換成一個SecretKey對象
      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
      SecretKey key = keyFactory.generateSecret(deskey);
      // 解密對象
      Cipher cipher = Cipher.getInstance("DES");
      cipher.init(Cipher.DECRYPT_MODE, key, sr);
      // 把字符串解碼為字節(jié)數(shù)組，并解密
      decryptedData = new String(cipher.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(cryptData)));
    } catch (Exception e) {
      // log.error("解密錯誤，錯誤信息：", e);
      throw new RuntimeException("解密錯誤，錯誤信息：", e);
    }
    return decryptedData;
  }

  public static void main(String[] args) {
    String str = "123456";
    // DES數(shù)據(jù)加密
    String s1 = encryptBasedDes(str);
    System.out.println(s1);
    // DES數(shù)據(jù)解密
    String s2 = decryptBasedDes(s1);
    System.err.println(s2);
  }
}

/**
* 認證信息.(身份驗證) : Authentication 是用來驗證用戶身份
 * 
 * @param token
 * @return
 * @throws AuthenticationException
 */
@Override
protected AuthenticationInfo doGetAuthenticationInfo(
    AuthenticationToken authcToken) throws AuthenticationException {


  System.out.println("身份認證方法：MyShiroRealm.doGetAuthenticationInfo()");

  UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
  String name = token.getUsername();
  String password = String.valueOf(token.getPassword());
  //訪問一次，計數(shù)一次
  ValueOperations<String, String> opsForValue = stringRedisTemplate.opsForValue();
  opsForValue.increment(SHIRO_LOGIN_COUNT+name, 1);
  //計數(shù)大于5時，設置用戶被鎖定一小時
  if(Integer.parseInt(opsForValue.get(SHIRO_LOGIN_COUNT+name))>=5){
    opsForValue.set(SHIRO_IS_LOCK+name, "LOCK");
    stringRedisTemplate.expire(SHIRO_IS_LOCK+name, 1, TimeUnit.HOURS);
  }
  if ("LOCK".equals(opsForValue.get(SHIRO_IS_LOCK+name))){
    throw new DisabledAccountException("由于密碼輸入錯誤次數(shù)大于5次，帳號已經(jīng)禁止登錄！");
  }
  Map<String, Object> map = new HashMap<String, Object>();
  map.put("nickname", name);
  //密碼進行加密處理 明文為 password+name
  String paw = password+name;
  String pawDES = MyDES.encryptBasedDes(paw);
  map.put("pswd", pawDES);
  SysUser user = null;
  // 從數(shù)據(jù)庫獲取對應用戶名密碼的用戶
  List<SysUser> userList = sysUserService.selectByMap(map);
  if(userList.size()!=0){
    user = userList.get(0);
  } 
  if (null == user) {
    throw new AccountException("帳號或密碼不正確！");
  }else if(user.getStatus()==0){
    /**
     * 如果用戶的status為禁用。那么就拋出<code>DisabledAccountException</code>
     */
    throw new DisabledAccountException("此帳號已經(jīng)設置為禁止登錄！");
  }else{
    //登錄成功
    //更新登錄時間 last login time
    user.setLastLoginTime(new Date());
    sysUserService.updateById(user);
    //清空登錄計數(shù)
    opsForValue.set(SHIRO_LOGIN_COUNT+name, "0");
  }
  return new SimpleAuthenticationInfo(user, password, getName());
}