public byte[] GetDeviceProvisioningQrCode(PhoneClientData data, int height, int width, int margin)
{
var qrCodeWriter = new ZXing.BarcodeWriterPixelData
{
Format = ZXing.BarcodeFormat.QR_CODE,
Options = new QrCodeEncodingOptions {
Height = height, Width = width, Margin = margin
}
};
var pixelData = qrCodeWriter.Write(JsonConvert.SerializeObject(data));
using (var bitmap = new Bitmap(pixelData.Width, pixelData.Height, PixelFormat.Format32bppRgb))
using (var memoryStream = new MemoryStream())
{
var bitmapData = bitmap.LockBits(new Rectangle(0, 0, pixelData.Width, pixelData.Height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);
try
{
// we assume that the row stride of the bitmap is aligned to 4 byte multiplied by the width of the image
System.Runtime.InteropServices.Marshal.Copy(pixelData.Pixels, 0, bitmapData.Scan0,
pixelData.Pixels.Length);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
// save to stream as PNG
bitmap.Save(memoryStream, ImageFormat.Png);
return(memoryStream.ToArray());
}
}
public IActionResult GetProvisioningQrCode(string nonce = null, int height = 300, int width = 300, int margin = 0)
{
string queryParams = string.Empty;
if (!String.IsNullOrEmpty(nonce))
{
queryParams = $"?nonce={nonce}";
}
var data = new PhoneClientData
{
BaseUrl = $"{this.Request.Scheme}://{this.Request.Host}",
RegistrationUrl = $"{this.Request.Scheme}://{this.Request.Host}/api/devices{queryParams}",
RegistrationToken = this.tokenService.GetShortLivedDeviceRegistrationToken()
};
return(File(
this.deviceService.GetDeviceProvisioningQrCode(
data,
height,
width,
margin),
"image/png"));
}
