QR Code generation in OIE using ZXing #135

/**
 Encodes a string as a 1D or 2D barcode image (PNG-format)

 @param {String} payload - The actual data that should be transformed to a barcode (not base64)
 @param {String} imageWidth - Width of the barcode image in pixels . (<i>optional</i>) (<b>default:</b> 128)
 @param {String} format - Defines which QR-code format is used. (<i>optional</i>) (<b>default:</b> QR_CODE)<br>
 					 The following formats are available:
 					 <ul>
	 					 <li><b>AZTEC</b> - A 2D barcode barcode often used in transport tickets (e.g., airline boarding passes, train tickets). No quiet zone required.</li>
	 					 <li><b>CODABAR</b> - An older barcode type used in libraries, blood banks, photo labs. Limited symbol set.</li>
	 					 <li><b>CODE_39</b> - A simple alphanumeric barcode used in automotive, defense, and general inventory.</li>
	 					 <li><b>CODE_93</b> - A more compact and reliable version of Code 39, used in logistics.</li>
	 					 <li><b>CODE_128</b> - A very dense and flexible barcode supporting the full ASCII set; widely used in shipping, packaging, GS1 standards.</li>
	 					 <li><b>DATA_MATRIX</b> - A small 2D code used widely in logistics, electronics, and healthcare (e.g., medical instruments, tiny components).</li>
	 					 <li><b>EAN_8</b> - Short version of EAN-13, used on small packages (e.g., chewing gum, cigarettes).</li>
	 					 <li><b>EAN_13</b> - International retail barcode standard (13 digits) seen on almost all consumer goods.</li>
	 					 <li><b>ITF</b> - Numeric-only barcode, common in distribution and warehouse tracking (cartons, pallets).</li>
	 					 <li><b>PDF_417</b> - A stacked linear 2D barcode, often used for identification cards, transport, and government documents (e.g., driver’s licenses).</li>
	 					 <li><b>QR_CODE</b> - The well-known square barcode barcode used everywhere (URLs, payments, marketing, logistics).</li>
	 					 <li><b>UPC_A</b> - Standard 12-digit Universal Product Code used in the US/Canada retail system.</li>
	 					 <li><b>UPC_E</b> - Compressed version of UPC-A for smaller packages with limited space.</li>
	 					 <li><b>UPC_EAN_EXTENSION</b> - 2- or 5-digit add-on codes often used with UPC/EAN to encode supplemental data (like magazine issue number, book pricing).</li>
 					 </ul>
 @param {String} path - The path to which the QR-code PNG image should be written (<i>optional</i>)
 @return {byte[]} The QR-code PNG image as a base64-encoded byte array

*/
function generateBarcode(payload, imageWidth, format, path) {
	// define which barcodes are 2D
	const twoD = <><![CDATA[
AZTEC
DATA_MATRIX
MAXICODE
PDF_417
QR_CODE
]]></>.toString().trim().replace(/\r\n|\n|\r/g, ',');
	// set 128 as default width
	imageWidth = imageWidth || 128;
	
	// create a square image for 2d and a rectangular image for 1D barcodes
	imageHeight = (!format || (twoD.indexOf(format.toUpperCase()) != -1)) ? imageWidth : imageWidth / 2;
	// set QR_CODE as default format
	format = Packages.com.google.zxing.BarcodeFormat.valueOf(format && format.toUpperCase() || 'QR_CODE');
	// instatiate the writer
	var writer = new Packages.com.google.zxing.MultiFormatWriter();
	// generate the barcode
	var barcode = writer.encode(payload, format, imageWidth, imageHeight);	
	// create a byte array stream for writing the image to 
	var baos = new java.io.ByteArrayOutputStream();
	
	try {
		// and generate the image
		Packages.com.google.zxing.client.j2se.MatrixToImageWriter.writeToStream(barcode, 'png', baos);
	} finally {
		// make sure, the resources are freed up
		baos.flush();
		baos.close();
	}
	// get the image data as byte array
	var imageBytes = baos.toByteArray();
	
	// if a path was provided
	if(path){
	 // write the image also to the filesystem
	 FileUtil.write(path, false, imageBytes);
	}
	// return the image in base64 format
	return FileUtil.encode(imageBytes);
}