/// <summary>
/// 获取当前回话的用户ID，如果没有用户ID，则会创建一个用户ID
/// </summary>
/// <param name="context">请求上下文</param>
/// <param name="noCache">是否跳过缓存</param>
/// <returns></returns>
public static string GetUserId(HttpContext context, bool noCache = false)
{
HttpCookie cookie = context.Request.Cookies.Get("uid");
string userId = string.Empty;
string cookieValue = string.Empty;
var userApplication = new UserApplication();
// 没有用户ID，并且验证cookie合法 => 用户id是否存在，否则直接创建一个
if (cookie != null && cookie.Value != null && cookie.Value.Trim().Length <= 40 /*said 中 md5 生成的 uuid 只有32位*/)
{
cookieValue = cookie.Value.Trim();
// 第二层检测，如果从 cache 里面没有检测到 uid
if (CacheHelper.GetCache(cookieValue) != null)
{
userId = cookieValue;
}
// 从数据库查询检测，并将数据库结果缓存
if (userId == string.Empty && (noCache ?
userApplication.ExistsNoCache(cookie.Value) : // 配置了跳过缓存
userApplication.Exists(cookie.Value))) // EF默认有缓存，检索用户是否存在*应该*更快
{
// 确认是合法的 cookie
userId = cookieValue;
// 放入缓存
CacheHelper.SetCache(cookieValue, userId);
}
}
try
{
// 还没有找到 uid，则重新生成一个
if (string.Empty == userId)
{
cookie = new HttpCookie("uid");
userId = SaidCommon.GUID;
User user = new User
{
UserID = userId,
EMail = string.Empty,
Name = string.Empty,
Date = DateTime.Now,
//如果是管理员则种下管理员的GUID，否则重新生成一个普通用户的GUID
SecretKey = context.Session["adminId"] != null ? context.Session["adminId"] as string : SaidCommon.GUID,
//管理员则标记上管理员身份
Rule = context.Session["adminId"] != null ? 1 : 0,
IsSubscribeComments = true,
Site = string.Empty
};
userApplication.Add(user);
if (userApplication.Commit())
{
cookie.Name = "uid";
cookie.Value = userId;
//cookie.Values.Add("id", userId);
cookie.Path = "/";
cookie.Expires = DateTime.Now.AddYears(1);
context.Response.Cookies.Add(cookie);
}
}
}
catch (Exception e)
{
logManager.Error("获取用户信息发生异常", e);
throw e;
}
context.Session["userId"] = userId;
return(userId);
}