Add customisation arguments.

Add presentation of QR code in HTML.

src/core/operations/GenerateQRCode.mjs

@@ -7,7 +7,8 @@
 import Operation from "../Operation";
 import OperationError from "../errors/OperationError";
 import qr from "qr-image";
-
+import { toBase64 } from "../lib/Base64";
+import Magic from "../lib/Magic";
 
 /**
  * Generate QR Code operation
@@ -21,12 +22,29 @@ class GenerateQRCode extends Operation {
         super();
 
         this.name = "Generate QR Code";
-        this.module = "Default";
+        this.module = "QRCode";
         this.description = "Generates a QR code from text.";
         this.infoURL = "https://en.wikipedia.org/wiki/QR_code";
         this.inputType = "string";
         this.outputType = "byteArray";
-        this.args = [];
+        this.presentType = "html";
+        this.args = [
+            {
+                "name": "Image Format",
+                "type": "option",
+                "value": ["SVG", "PNG"]
+            },
+            {
+                "name": "Size of QR module",
+                "type": "number",
+                "value": 5
+            },
+            {
+                "name": "Margin",
+                "type": "number",
+                "value": 2
+            }
+        ];
     }
 
     /**
@@ -35,11 +53,50 @@ class GenerateQRCode extends Operation {
      * @returns {File}
      */
     run(input, args) {
-        const qrImage = new Buffer(qr.imageSync(input, { type : "png" }));
+        // Create new QR image from the input data, and convert it to a buffer
+        const [format, size, margin] = args;
+        const qrImage = qr.imageSync(input, { type: format, size: size, margin: margin });
         if (qrImage == null) {
-            return [input];
+            throw new OperationError("Error generating QR code.");
+        }
+        if (format === "SVG") {
+            return [...Buffer.from(qrImage)];
+        } else if (format === "PNG") {
+            // Return the QR image buffer as a byte array
+            return [...qrImage];
+        } else {
+            throw new OperationError("Error generating QR code.");
+        }
+    }
+
+    /**
+     * Displays the QR image using HTML for web apps
+     * 
+     * @param {byteArray} data
+     * @returns {html}
+     */
+    present(data, args) {
+        if (!data.length) return "";
+
+        const [format] = args;
+        if (format === "SVG") {
+            let outputData = "";
+            for (let i = 0; i < data.length; i++){
+                outputData += String.fromCharCode(parseInt(data[i]));
+            }
+            return outputData;
+        } else if (format === "PNG") {
+            let dataURI = "data:";
+            const type = Magic.magicFileType(data);
+            if (type && type.mime.indexOf("image") === 0){
+                dataURI += type.mime + ";";
+            } else {
+                throw new OperationError("Invalid file type");
+            }
+            dataURI += "base64," + toBase64(data);
+
+            return "<img src='" + dataURI + "'>";
         }
-        return [...qrImage];
     }
 
 }