mirror of https://github.com/gchq/CyberChef.git
82 lines
2.3 KiB
JavaScript
82 lines
2.3 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.mjs";
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import {detectFileType} from "../lib/FileType.mjs";
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import {FILE_SIGNATURES} from "../lib/FileSignatures.mjs";
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// Concat all supported extensions into a single flat list
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const exts = [].concat.apply([], Object.keys(FILE_SIGNATURES).map(cat =>
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[].concat.apply([], FILE_SIGNATURES[cat].map(sig =>
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sig.extension.split(",")
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))
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)).unique().sort().join(", ");
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/**
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* Detect File Type operation
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*/
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class DetectFileType extends Operation {
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/**
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* DetectFileType constructor
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*/
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constructor() {
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super();
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this.name = "Detect File Type";
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this.module = "Default";
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this.description = "Attempts to guess the MIME (Multipurpose Internet Mail Extensions) type of the data based on 'magic bytes'.<br><br>Currently supports the following file types: " +
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exts + ".";
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this.infoURL = "https://wikipedia.org/wiki/List_of_file_signatures";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = Object.keys(FILE_SIGNATURES).map(cat => {
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return {
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name: cat,
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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 data = new Uint8Array(input),
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categories = [];
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args.forEach((cat, i) => {
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if (cat) categories.push(Object.keys(FILE_SIGNATURES)[i]);
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});
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const types = detectFileType(data, categories);
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if (!types.length) {
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return "Unknown file type. Have you tried checking the entropy of this data to determine whether it might be encrypted or compressed?";
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} else {
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const results = types.map(type => {
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let output = `File type: ${type.name}
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Extension: ${type.extension}
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MIME type: ${type.mime}\n`;
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if (type.description && type.description.length) {
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output += `Description: ${type.description}\n`;
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}
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return output;
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});
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return results.join("\n");
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}
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}
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}
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export default DetectFileType;
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