mirror of https://github.com/gchq/CyberChef.git
102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
/**
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* @author j433866 [j433866@gmail.com]
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* @copyright Crown Copyright 2019
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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 { isImage } from "../lib/FileType.mjs";
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import { toBase64 } from "../lib/Base64.mjs";
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import { isWorkerEnvironment } from "../Utils.mjs";
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import jimp from "jimp";
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/**
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* Flip Image operation
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*/
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class FlipImage extends Operation {
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/**
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* FlipImage constructor
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*/
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constructor() {
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super();
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this.name = "Flip Image";
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this.module = "Image";
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this.description = "Flips an image along its X or Y axis.";
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this.infoURL = "";
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this.inputType = "ArrayBuffer";
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this.outputType = "ArrayBuffer";
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this.presentType = "html";
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this.args = [
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{
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name: "Axis",
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type: "option",
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value: ["Horizontal", "Vertical"]
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}
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];
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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 {byteArray}
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*/
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async run(input, args) {
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const [flipAxis] = args;
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if (!isImage(input)) {
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throw new OperationError("Invalid input file type.");
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}
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let image;
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try {
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image = await jimp.read(input);
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} catch (err) {
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throw new OperationError(`Error loading image. (${err})`);
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}
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try {
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if (isWorkerEnvironment())
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self.sendStatusMessage("Flipping image...");
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switch (flipAxis) {
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case "Horizontal":
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image.flip(true, false);
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break;
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case "Vertical":
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image.flip(false, true);
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break;
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}
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let imageBuffer;
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if (image.getMIME() === "image/gif") {
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imageBuffer = await image.getBufferAsync(jimp.MIME_PNG);
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} else {
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imageBuffer = await image.getBufferAsync(jimp.AUTO);
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}
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return imageBuffer.buffer;
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} catch (err) {
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throw new OperationError(`Error flipping image. (${err})`);
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}
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}
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/**
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* Displays the flipped image using HTML for web apps
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* @param {ArrayBuffer} data
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* @returns {html}
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*/
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present(data) {
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if (!data.byteLength) return "";
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const dataArray = new Uint8Array(data);
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const type = isImage(dataArray);
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if (!type) {
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throw new OperationError("Invalid file type.");
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}
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return `<img src="data:${type};base64,${toBase64(dataArray)}">`;
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}
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}
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export default FlipImage;
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