mirror of https://github.com/gchq/CyberChef.git
103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
/**
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* @author Matt C [matt@artemisbot.uk]
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* @copyright Crown Copyright 2018
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import Utils from "../Utils.mjs";
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import {isImage} from "../lib/FileType.mjs";
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import jimp from "jimp";
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/**
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* Split Colour Channels operation
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*/
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class SplitColourChannels extends Operation {
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/**
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* SplitColourChannels constructor
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*/
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constructor() {
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super();
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this.name = "Split Colour Channels";
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this.module = "Image";
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this.description = "Splits the given image into its red, green and blue colour channels.";
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this.infoURL = "https://wikipedia.org/wiki/Channel_(digital_image)";
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this.inputType = "ArrayBuffer";
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this.outputType = "List<File>";
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this.presentType = "html";
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this.args = [];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {List<File>}
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*/
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async run(input, args) {
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input = new Uint8Array(input);
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// Make sure that the input is an image
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if (!isImage(input)) throw new OperationError("Invalid file type.");
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const parsedImage = await jimp.read(Buffer.from(input));
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const red = new Promise(async (resolve, reject) => {
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try {
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const split = parsedImage
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.clone()
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.color([
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{apply: "blue", params: [-255]},
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{apply: "green", params: [-255]}
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])
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.getBufferAsync(jimp.MIME_PNG);
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resolve(new File([new Uint8Array((await split).values())], "red.png", {type: "image/png"}));
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} catch (err) {
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reject(new OperationError(`Could not split red channel: ${err}`));
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}
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});
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const green = new Promise(async (resolve, reject) => {
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try {
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const split = parsedImage.clone()
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.color([
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{apply: "red", params: [-255]},
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{apply: "blue", params: [-255]},
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]).getBufferAsync(jimp.MIME_PNG);
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resolve(new File([new Uint8Array((await split).values())], "green.png", {type: "image/png"}));
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} catch (err) {
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reject(new OperationError(`Could not split green channel: ${err}`));
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}
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});
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const blue = new Promise(async (resolve, reject) => {
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try {
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const split = parsedImage
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.color([
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{apply: "red", params: [-255]},
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{apply: "green", params: [-255]},
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]).getBufferAsync(jimp.MIME_PNG);
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resolve(new File([new Uint8Array((await split).values())], "blue.png", {type: "image/png"}));
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} catch (err) {
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reject(new OperationError(`Could not split blue channel: ${err}`));
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}
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});
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return await Promise.all([red, green, blue]);
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}
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/**
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* Displays the files in HTML for web apps.
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*
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* @param {File[]} files
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* @returns {html}
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*/
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async present(files) {
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return await Utils.displayFilesAsHTML(files);
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}
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}
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export default SplitColourChannels;
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