/// <summary>
/// Generate a setup code for a Google Authenticator user to scan
/// </summary>
/// <param name="issuer">Issuer ID (the name of the system, i.e. 'MyApp'), can be omitted but not recommended https://github.com/google/google-authenticator/wiki/Key-Uri-Format </param>
/// <param name="accountTitleNoSpaces">Account Title (no spaces)</param>
/// <param name="accountSecretKey">Account Secret Key as byte[]</param>
/// <param name="QRPixelsPerModule">Number of pixels per QR Module (2 = ~120x120px QRCode, should be 10 or less)</param>
/// <returns>SetupCode object</returns>
public SetupCode GenerateSetupCode(string issuer, string accountTitleNoSpaces, byte[] accountSecretKey, int QRPixelsPerModule = 3, bool generateQrCode = true)
{
if (String.IsNullOrWhiteSpace(accountTitleNoSpaces))
{
throw new NullReferenceException("Account Title is null");
}
accountTitleNoSpaces = RemoveWhitespace(Uri.EscapeUriString(accountTitleNoSpaces));
string encodedSecretKey = Base32Encoding.ToString(accountSecretKey);
string provisionUrl;
if (String.IsNullOrWhiteSpace(issuer))
{
provisionUrl = String.Format("otpauth://totp/{0}?secret={1}", accountTitleNoSpaces, encodedSecretKey.Trim('='));
}
else
{
// https://github.com/google/google-authenticator/wiki/Conflicting-Accounts
// Added additional prefix to account otpauth://totp/Company:[email protected] for backwards compatibility
provisionUrl = String.Format("otpauth://totp/{2}:{0}?secret={1}&issuer={2}", accountTitleNoSpaces, encodedSecretKey.Trim('='), UrlEncode(issuer));
}
string qrCodeUrl = string.Empty;
if (generateQrCode)
{
try
{
using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(provisionUrl, QRCodeGenerator.ECCLevel.Q))
using (QRCode qrCode = new QRCode(qrCodeData))
using (Bitmap qrCodeImage = qrCode.GetGraphic(QRPixelsPerModule))
using (MemoryStream ms = new MemoryStream())
{
qrCodeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
qrCodeUrl = String.Format("data:image/png;base64,{0}", Convert.ToBase64String(ms.ToArray()));
}
}
catch (System.TypeInitializationException e)
{
if (e.InnerException != null &&
e.InnerException.GetType() == typeof(System.DllNotFoundException) &&
e.InnerException.Message.Contains("libgdiplus"))
{
throw new MissingDependencyException("It looks like libgdiplus has not been installed - see https://github.com/codebude/QRCoder/issues/227", e);
}
}
catch (System.Runtime.InteropServices.ExternalException e)
{
if (e.Message.Contains("GDI+") && QRPixelsPerModule > 10)
{
throw new QRException($"There was a problem generating a QR code. The value of {nameof(QRPixelsPerModule)} should be set to a value of 10 or less for optimal results.", e);
}
}
}
return(new SetupCode(accountTitleNoSpaces, encodedSecretKey.Trim('='), qrCodeUrl));
}
/// <summary>
/// Generate a setup code for a Google Authenticator user to scan
/// </summary>
/// <param name="issuer">Issuer ID (the name of the system, i.e. 'MyApp'), can be omitted but not recommended https://github.com/google/google-authenticator/wiki/Key-Uri-Format </param>
/// <param name="accountTitleNoSpaces">Account Title (no spaces)</param>
/// <param name="accountSecretKey">Account Secret Key</param>
/// <param name="secretIsBase32">Flag saying if accountSecretKey is in Base32 format or original secret</param>
/// <param name="QRPixelsPerModule">Number of pixels per QR Module (2 pixels give ~ 100x100px QRCode, should be 10 or less)</param>
/// <returns>SetupCode object</returns>
public SetupCode GenerateSetupCode(string issuer, string accountTitleNoSpaces, string accountSecretKey, bool secretIsBase32, int QRPixelsPerModule = 3)
{
byte[] key = secretIsBase32 ? Base32Encoding.ToBytes(accountSecretKey) : Encoding.UTF8.GetBytes(accountSecretKey);
return(GenerateSetupCode(issuer, accountTitleNoSpaces, key, QRPixelsPerModule));
}