问节点-qrcode显示在服务器端使用Otp.NET不可变的不同代码

EN

 var otpSeed = KeyGeneration.GenerateRandomKey(OtpHashMode.Sha512);
 userIdentity.OTPSeed = otpSeed;

 customResponse.Add(TwoFASeedKey, Base32Encoding.ToString(key));
 customResponse.Add("OtpHashMode", "SHA512");
 customResponse.Add("Username", "alice@demo");
 customResponse.Add("Issuer", "demo Issuer");

public bool VerifyOtp(byte[] otpSeed, string otpCode) // otpSeed is the same secret which is being generated at the first step.
{
   var totp = new Totp(otpSeed, 30, OtpHashMode.Sha512, 6);
   return totp.VerifyTotp(otpCode, out var timeWindow, VerificationWindow.RfcSpecifiedNetworkDelay)
}

 public void postLogin(){
      await this.oauthService.fetchTokenUsingPasswordFlow(username, password)
            .then(response => {

            const state = response['2FAState'];

       const seed = response['2FASeed'];
       const issuer = response['Issuer'];
       const userName = response['Username'];
       const otpHashMode = response['OtpHashMode'];


       this.username = userName;
       this.totpUri = this.makeTotpUri(seed, issuer, userName, otpHashMode);

       toDataURL(this.totpUri).then((data_url) => {
             this.otpQrCodeUrl = data_url; // This OtpQrCode bound with img src at HTML, which shows QR code png image at screen. Google Auth easily scans that image and shows the 6 digit code.
      });
  });

 private toTotpUri({ secret, accountName, issuer, algo, digits, period }:
 {
        secret: string; accountName: string; issuer: string;
        algo: string; digits: number; period: number;
 }) 
 {            
    return `otpauth://totp/${encodeURI(issuer || '')}
            :${encodeURI(accountName || '')}
            ?secret=${secret.replace(/[\s\.\_\-]+/g, '').toUpperCase()}
            &issuer=${encodeURIComponent(issuer || '')}
            &algorithm=${algo}
            &digits=${digits || 6}
            &period=${period || 30}`;
}

public makeTotpUri(seed: string, issuer: string, userName: string, otpHashMode: string): string {

    return this.toTotpUri({ secret: seed, accountName: userName, issuer, 
    algo: otpHashMode, digits: 6, period: 120 });
}

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