Add new Generate QR Code module

src/core/config/Categories.json

@@ -351,6 +351,7 @@
             "Generate UUID",
             "Generate TOTP",
             "Generate HOTP",
+            "Generate QR Code",
             "Haversine distance",
             "Render Image",
             "Remove EXIF",

src/core/operations/GenerateQRCode.mjs

@@ -0,0 +1,47 @@
+/**
+ * @author j433866 [j433866@gmail.com]
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+import qr from "qr-image";
+
+
+/**
+ * Generate QR Code operation
+ */
+class GenerateQRCode extends Operation {
+
+    /**
+     * GenerateQRCode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Generate QR Code";
+        this.module = "Default";
+        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 = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {File}
+     */
+    run(input, args) {
+        const qrImage = new Buffer(qr.imageSync(input, { type : "png" }));
+        if (qrImage == null) {
+            return [input];
+        }
+        return [...qrImage];
+    }
+
+}
+
+export default GenerateQRCode;