using System;

using System.Collections.Generic;

using System.IdentityModel.Tokens.Jwt;

using System.Security.Claims;

using System.Text;

using Microsoft.IdentityModel.Tokens;

public class Program

{

    public static void Main()

    {

        var userInfo = new UserInfo

        {

            UserName = "Jeff",

            Email = "teste@teste.com",

            Roles = new[] {"read", "update"}

        };

        Console.WriteLine(new JwtTokenGenerator("Minha chave para o fornecedor x da empresa Ai...", new TimeSpan(1,0,0,0)).GenerateToken(userInfo));

    }

}

​

public class UserInfo

{

    public string UserName { get; set; }

    public string Email { get; set; }

    public string[] Roles { get; set; }

}

​

public class JwtTokenGenerator

{

    private readonly string _secretKey;

    private readonly TimeSpan _expirationTime;

​

    public JwtTokenGenerator(string secretKey, TimeSpan expirationTime)

    {

        _secretKey = secretKey;

        _expirationTime = expirationTime;

    }

​

    public string GenerateToken(UserInfo userInfo)

    {

        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_secretKey));

        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

​

        var claims = new List<Claim>

        {

            new Claim(JwtRegisteredClaimNames.Sub, userInfo.UserName),

            new Claim(JwtRegisteredClaimNames.Email, userInfo.Email)

        };

​

        foreach (var role in userInfo.Roles)

        {

            claims.Add(new Claim(ClaimTypes.Role, role));

        }

​

        var token = new JwtSecurityToken(

            issuer: "Banco X",

            audience: "Audience x",

            claims: claims,

            expires: DateTime.Now.Add(_expirationTime),

            signingCredentials: credentials

        );

​

        return new JwtSecurityTokenHandler().WriteToken(token);

    }

}

​