如何生成一个在 24 小时后过期的唯一令牌? [英] how to generate a unique token which expires after 24 hours?

问题描述

我有一个 WCF Web 服务，用于检查用户是否有效.

I have a WCF Webservice which checks if the user is valid.

如果用户有效，我想生成一个 24 小时后过期的令牌.

If the user is valid I want to generate a token which expires after 24 hours.

public bool authenticateUserManual(string userName, string password,string language,string token)
{
    if (Membership.ValidateUser(userName,password))
    {
        //////////
        string token = ???? 
        //////////

        return true;
    }
    else 
    {
        return false;
    }
}   

推荐答案

有两种可能的方法；您可以创建一个唯一值并与创建时间一起存储在某个位置，例如在数据库中，或者将创建时间放在令牌中，以便稍后对其进行解码并查看它的创建时间.

There are two possible approaches; either you create a unique value and store somewhere along with the creation time, for example in a database, or you put the creation time inside the token so that you can decode it later and see when it was created.

要创建唯一令牌:

string token = Convert.ToBase64String(Guid.NewGuid().ToByteArray());

创建包含时间戳的唯一令牌的基本示例:

Basic example of creating a unique token containing a time stamp:

byte[] time = BitConverter.GetBytes(DateTime.UtcNow.ToBinary());
byte[] key = Guid.NewGuid().ToByteArray();
string token = Convert.ToBase64String(time.Concat(key).ToArray());

解码令牌以获取创建时间:

To decode the token to get the creation time:

byte[] data = Convert.FromBase64String(token);
DateTime when = DateTime.FromBinary(BitConverter.ToInt64(data, 0));
if (when < DateTime.UtcNow.AddHours(-24)) {
  // too old
}

注意:如果需要带时间戳的令牌安全，则需要对其进行加密.否则，用户可能会弄​​清楚它包含什么并创建一个错误的令牌.

Note: If you need the token with the time stamp to be secure, you need to encrypt it. Otherwise a user could figure out what it contains and create a false token.

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