package org.keycloak.services.resources;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import javax.servlet.ServletException;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.StreamingOutput;
import java.io.IOException;
import java.io.OutputStream;
/**
* Create a barcode image
*
* @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
*/
@Path("/qrcode")
public class QRCodeResource {
/**
* Create a bar code image
*
* @param contents
* @param size
* @return
* @throws ServletException
* @throws IOException
* @throws WriterException
*/
@GET
@Produces("image/png")
public Response createQrCode(@QueryParam("contents") String contents, @QueryParam("size") String size) throws ServletException, IOException, WriterException {
int width = 256;
int height = 256;
if (size != null) {
String[] s = size.split("x");
try {
width = Integer.parseInt(s[0]);
height = Integer.parseInt(s[1]);
} catch (Throwable t) {
return Response.status(Response.Status.BAD_REQUEST).build();
}
}
if (contents == null) {
return Response.status(Response.Status.BAD_REQUEST).build();
}
if (width > 1000 || height > 1000 || contents.length() > 1000) {
return Response.status(Response.Status.BAD_REQUEST).build();
}
QRCodeWriter writer = new QRCodeWriter();
final BitMatrix bitMatrix = writer.encode(contents, BarcodeFormat.QR_CODE, width, height);
StreamingOutput stream = new StreamingOutput() {
@Override
public void write(OutputStream os) throws IOException,
WebApplicationException {
MatrixToImageWriter.writeToStream(bitMatrix, "png", os);
}
};
return Response.ok(stream).build();
}
}