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Tidied up QR code operations

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This commit is contained in:
n1474335 2018-12-25 21:54:38 +00:00
parent 4ee0800990
commit 9734b78aeb
5 changed files with 683 additions and 140 deletions
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63
src/core/operations/GenerateQRCode.mjs
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@ -9,6 +9,7 @@ import OperationError from "../errors/OperationError";
import qr from "qr-image";
import { toBase64 } from "../lib/Base64";
import Magic from "../lib/Magic";
import Utils from "../Utils";
/**
* Generate QR Code operation
@ -23,7 +24,7 @@ class GenerateQRCode extends Operation {
this.name = "Generate QR Code";
this.module = "Image";
this.description = "Generates a QR code from text.";
this.description = "Generates a Quick Response (QR) code from the input text.<br><br>A QR code is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached.";
this.infoURL = "https://wikipedia.org/wiki/QR_code";
this.inputType = "string";
this.outputType = "byteArray";
@ -32,17 +33,23 @@ class GenerateQRCode extends Operation {
{
"name": "Image Format",
"type": "option",
"value": ["PNG", "SVG"]
"value": ["PNG", "SVG", "EPS", "PDF"]
},
{
"name": "Size of QR module",
"name": "Module size (px)",
"type": "number",
"value": 5
},
{
"name": "Margin",
"name": "Margin (num modules)",
"type": "number",
"value": 2
},
{
"name": "Error correction",
"type": "option",
"value": ["Low", "Medium", "Quartile", "High"],
"defaultIndex": 1
}
];
}
@ -50,28 +57,39 @@ class GenerateQRCode extends Operation {
/**
* @param {string} input
* @param {Object[]} args
* @returns {File}
* @returns {byteArray}
*/
run(input, args) {
const [format, size, margin, errorCorrection] = args;
// 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 });
const qrImage = qr.imageSync(input, {
type: format,
size: size,
margin: margin,
"ec_level": errorCorrection.charAt(0).toUpperCase()
});
if (qrImage == null) {
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.");
switch (format) {
case "SVG":
case "EPS":
case "PDF":
return [...Buffer.from(qrImage)];
case "PNG":
// Return the QR image buffer as a byte array
return [...qrImage];
default:
throw new OperationError("Unsupported QR code format.");
}
}
/**
* Displays the QR image using HTML for web apps
*
*
* @param {byteArray} data
* @returns {html}
*/
@ -79,24 +97,21 @@ class GenerateQRCode extends Operation {
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");
throw new OperationError("Invalid PNG file generated by QR image");
}
dataURI += "base64," + toBase64(data);
return "<img src='" + dataURI + "'>";
return `<img src="${dataURI}">`;
}
return Utils.byteArrayToChars(data);
}
}