如何在不使用JWT的情况下从访问令牌中获取用户数据

Question

I am getting Access token from the Azure AD Login. But i don't want to use JWT dll for extract data from the Access Token. So i need a alternative solution for this. This is my Sample code in JWT

 var handler = new JwtSecurityTokenHandler();
            JwtSecurityToken tokenS = handler.ReadToken(data.AccessToken) as JwtSecurityToken;
            var claims = tokenS.Claims;
            var username = claims.FirstOrDefault(s => s.Type == "email").Value;

used dlls: using System.IdentityModel.Tokens.Jwt; I don't want this dll for extract data. I need another solution without using dll.

Answer 1

I will not ask why you dont want to use the library you have for the exact purpose its intended for. Anyway a JWT is just 3 base 64 encoded strings concatenated with '.', (assuming its signed but not encrypted)

So:

var split = jwt.Split('.')
var token = Convert.FromBase64String(split([1]))

the middle bit is the token in json, use newtonsoft to read it