mirror of https://github.com/gchq/CyberChef.git
83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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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 {fromBase64, ALPHABET_OPTIONS} from "../lib/Base64";
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/**
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* From Base64 operation
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*/
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class FromBase64 extends Operation {
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/**
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* FromBase64 constructor
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*/
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constructor() {
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super();
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this.name = "From Base64";
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this.module = "Default";
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this.description = "Base64 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers.<br><br>This operation decodes data from an ASCII Base64 string back into its raw format.<br><br>e.g. <code>aGVsbG8=</code> becomes <code>hello</code>";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [
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{
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name: "Alphabet",
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type: "editableOption",
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value: ALPHABET_OPTIONS
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},
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{
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name: "Remove non-alphabet chars",
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type: "boolean",
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value: true
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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 {string}
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*/
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run(input, args) {
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const [alphabet, removeNonAlphChars] = args;
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return fromBase64(input, alphabet, "byteArray", removeNonAlphChars);
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}
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/**
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* Highlight to Base64
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*
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* @param {Object[]} pos
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* @param {number} pos[].start
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* @param {number} pos[].end
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* @param {Object[]} args
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* @returns {Object[]} pos
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*/
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highlight(pos, args) {
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pos[0].start = Math.ceil(pos[0].start / 4 * 3);
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pos[0].end = Math.floor(pos[0].end / 4 * 3);
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return pos;
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}
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/**
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* Highlight from Base64
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*
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* @param {Object[]} pos
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* @param {number} pos[].start
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* @param {number} pos[].end
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* @param {Object[]} args
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* @returns {Object[]} pos
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*/
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highlightReverse(pos, args) {
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pos[0].start = Math.floor(pos[0].start / 3 * 4);
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pos[0].end = Math.ceil(pos[0].end / 3 * 4);
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return pos;
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}
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}
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export default FromBase64;
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