public async Task <string> GenerateQRCode(string secret)
{
var user = await _userManager.GetUserAsync(_httpContextAccessor.HttpContext.User);
QRCodeGenerator qrGenerator = new QRCodeGenerator();
var buffer = Base32.ToByteArray(secret);
var secretBase32 = Base32.ToString(buffer);
string payload = $"otpauth://totp/BorovClub:{user.Email}?secret={secret}&issuer=BorovClub&algorithm=SHA1&digits=6&period=30";
QRCodeData qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
Base64QRCode qrCode = new Base64QRCode(qrCodeData);
string qrCodeImageAsBase64 = qrCode.GetGraphic(20);
user.TwoFactorEnabled = true;
user.TotpSecret = secretBase32;
await _userManager.UpdateAsync(user);
await _dbContext.SaveChangesAsync();
return(qrCodeImageAsBase64);
}