mirror of https://github.com/gchq/CyberChef.git
109 lines
2.9 KiB
JavaScript
109 lines
2.9 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";
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import OperationError from "../errors/OperationError";
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import Magic from "../lib/Magic";
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import { toBase64 } from "../lib/Base64.mjs";
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import jimp from "jimp";
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/**
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* Image Brightness / Contrast operation
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*/
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class ImageBrightnessContrast extends Operation {
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/**
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* ImageBrightnessContrast constructor
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*/
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constructor() {
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super();
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this.name = "Image Brightness / Contrast";
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this.module = "Image";
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this.description = "Adjust the brightness and contrast of an image.";
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this.infoURL = "";
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this.inputType = "byteArray";
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this.outputType = "byteArray";
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this.presentType = "html";
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this.args = [
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{
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name: "Brightness",
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type: "number",
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value: 0,
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min: -100,
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max: 100
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},
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{
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name: "Contrast",
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type: "number",
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value: 0,
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min: -100,
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max: 100
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}
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];
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}
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/**
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* @param {byteArray} 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 [brightness, contrast] = args;
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const type = Magic.magicFileType(input);
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if (!type || type.mime.indexOf("image") !== 0){
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throw new OperationError("Invalid 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(Buffer.from(input));
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} catch (err) {
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throw new OperationError(`Error loading image. (${err})`);
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}
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try {
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if (brightness !== 0) {
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if (ENVIRONMENT_IS_WORKER())
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self.sendStatusMessage("Changing image brightness...");
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image.brightness(brightness / 100);
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}
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if (contrast !== 0) {
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if (ENVIRONMENT_IS_WORKER())
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self.sendStatusMessage("Changing image contrast...");
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image.contrast(contrast / 100);
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}
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const imageBuffer = await image.getBufferAsync(jimp.AUTO);
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return [...imageBuffer];
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} catch (err) {
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throw new OperationError(`Error adjusting image brightness / contrast. (${err})`);
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}
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}
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/**
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* Displays the image using HTML for web apps
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* @param {byteArray} data
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* @returns {html}
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*/
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present(data) {
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if (!data.length) return "";
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let dataURI = "data:";
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const type = Magic.magicFileType(data);
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if (type && type.mime.indexOf("image") === 0){
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dataURI += type.mime + ";";
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} else {
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throw new OperationError("Invalid file type");
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}
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dataURI += "base64," + toBase64(data);
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return "<img src='" + dataURI + "'>";
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}
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}
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export default ImageBrightnessContrast;
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