CyberChef/src/core/operations/OCR.mjs

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2019-09-04 20:37:02 +02:00
/**
* @author mshwed [m@ttshwed.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import { isImage } from "../lib/FileType.mjs";
import { isWorkerEnvironment } from "../Utils.mjs";
import jimp from "jimp";
import Tesseract from "tesseract.js";
const { TesseractWorker } = Tesseract;
/**
* OCR operation
*/
class OCR extends Operation {
/**
* OCR constructor
*/
constructor() {
super();
this.name = "OCR";
this.module = "Default";
this.description = "Optical character recognition or optical character reader (OCR) is the mechanical or electronic conversion of images of typed, handwritten or printed text into machine-encoded text.";
this.infoURL = "https://en.wikipedia.org/wiki/Optical_character_recognition";
this.inputType = "ArrayBuffer";
this.outputType = "string";
this.args = [
/* Example arguments. See the project wiki for full details.
{
name: "First arg",
type: "string",
value: "Don't Panic"
},
{
name: "Second arg",
type: "number",
value: 42
}
*/
];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {Object}
*/
async run(input, args) {
if (!isImage(input)) {
throw new OperationError("Invalid File Type");
}
try {
if (isWorkerEnvironment())
self.sendStatusMessage("Performing OCR on image...");
let image;
try {
image = await jimp.read(input);
image = await image.getBase64Async(jimp.AUTO);
} catch (err) {
throw new OperationError(`Error loading image. (${err})`);
}
const worker = new TesseractWorker();
const result = await worker.recognize(image)
.progress(progress => {
if (isWorkerEnvironment()) self.sendStatusMessage(`${progress.status} - ${parseFloat(progress.progress).toFixed(2)}%`);
});
console.log(result);
return result.text;
} catch (err) {
throw new OperationError(`Error performing OCR on image. (${err})`);
}
}
}
export default OCR;