//取得使用者信息
public User GetUser(string token)
{
var split = token.Split('.');
var iv = split[0];
var encrypt = split[1];
var signature = split[2];
//检查签章是否正确
if (signature != TokenCrypto.ComputeHMACSHA256(iv + "." + encrypt, key.Substring(0, 64)))
{
return(null);
}
//使用 AES 解密 Payload
var base64 = TokenCrypto.AESDecrypt(encrypt, key.Substring(0, 16), iv);
var json = Encoding.UTF8.GetString(Convert.FromBase64String(base64));
var payload = JsonConvert.DeserializeObject <Payload>(json);
//检查是否过期
if (payload.Exp < Convert.ToInt32(
(DateTime.Now - new DateTime(1970, 1, 1)).TotalSeconds))
{
return(null);
}
return(payload.Info);
}
//产生 Token
public Token Create(User user)
{
var exp = 36000; //过期时间(秒)
//稍微修改 Payload 将使用着咨询和过期时间翻开
var payload = new Payload
{
Info = user,
//Unix 时间戳
Exp = Convert.ToInt32((DateTime.Now.AddSeconds(exp) - new DateTime(1970, 1, 1)).TotalSeconds)
};
var json = JsonConvert.SerializeObject(payload);
var base64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(json));
var iv = Guid.NewGuid().ToString().Replace("-", "").Substring(0, 16);
//使用 AES 加密 Payload
var encrypt = TokenCrypto.AESEncrypt(base64, key.Substring(0, 16), iv);
//取得签章
var signature = TokenCrypto.ComputeHMACSHA256(iv + "." + encrypt, key.Substring(0, 64));
return(new Token
{
//Token 为 iv + encrypt + signature，并用 . 串联
Access_token = iv + "." + encrypt + "." + signature,
//Refresh Token 使用 Guid 产生
Refresh_token = Guid.NewGuid().ToString().Replace("-", ""),
Expires_in = exp,
});
}
