CyberChef/src/core/operations/NormaliseImage.mjs
2020-12-14 17:51:12 +00:00

86 lines
2.2 KiB
JavaScript

/**
* @author j433866 [j433866@gmail.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 { toBase64 } from "../lib/Base64.mjs";
import jimplib from "jimp/es/index.js";
const jimp = jimplib.default ? jimplib.default : jimplib;
/**
* Normalise Image operation
*/
class NormaliseImage extends Operation {
/**
* NormaliseImage constructor
*/
constructor() {
super();
this.name = "Normalise Image";
this.module = "Image";
this.description = "Normalise the image colours.";
this.infoURL = "";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType= "html";
this.args = [];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
if (!isImage(input)) {
throw new OperationError("Invalid file type.");
}
let image;
try {
image = await jimp.read(input);
} catch (err) {
throw new OperationError(`Error opening image file. (${err})`);
}
try {
image.normalize();
let imageBuffer;
if (image.getMIME() === "image/gif") {
imageBuffer = await image.getBufferAsync(jimp.MIME_PNG);
} else {
imageBuffer = await image.getBufferAsync(jimp.AUTO);
}
return imageBuffer.buffer;
} catch (err) {
throw new OperationError(`Error normalising image. (${err})`);
}
}
/**
* Displays the normalised image using HTML for web apps
* @param {ArrayBuffer} data
* @returns {html}
*/
present(data) {
if (!data.byteLength) return "";
const dataArray = new Uint8Array(data);
const type = isImage(dataArray);
if (!type) {
throw new OperationError("Invalid file type.");
}
return `<img src="data:${type};base64,${toBase64(dataArray)}">`;
}
}
export default NormaliseImage;