mirror of https://github.com/gchq/CyberChef.git
344 lines
6.9 KiB
JavaScript
344 lines
6.9 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 Utils from "../Utils";
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/**
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* From HTML Entity operation
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*/
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class FromHTMLEntity extends Operation {
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/**
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* FromHTMLEntity constructor
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*/
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constructor() {
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super();
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this.name = "From HTML Entity";
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this.module = "Default";
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this.description = "Converts HTML entities back to characters<br><br>e.g. <code>&<span>amp;</span></code> becomes <code>&</code>";
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this.infoURL = "https://wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [];
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this.patterns = [
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{
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match: "&(?:#\\d{2,3}|#x[\\da-f]{2}|[a-z]{2,6});",
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flags: "i",
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args: []
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},
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];
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}
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/**
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* @param {string} 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 regex = /&(#?x?[a-zA-Z0-9]{1,8});/g;
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let output = "",
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m,
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i = 0;
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while ((m = regex.exec(input))) {
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// Add up to match
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for (; i < m.index;)
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output += input[i++];
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// Add match
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const bite = entityToByte[m[1]];
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if (bite) {
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output += Utils.chr(bite);
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} else if (!bite && m[1][0] === "#" && m[1].length > 1 && /^#\d{1,6}$/.test(m[1])) {
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// Numeric entity (e.g. )
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const num = m[1].slice(1, m[1].length);
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output += Utils.chr(parseInt(num, 10));
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} else if (!bite && m[1][0] === "#" && m[1].length > 3 && /^#x[\dA-F]{2,8}$/i.test(m[1])) {
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// Hex entity (e.g. :)
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const hex = m[1].slice(2, m[1].length);
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output += Utils.chr(parseInt(hex, 16));
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} else {
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// Not a valid entity, print as normal
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for (; i < regex.lastIndex;)
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output += input[i++];
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}
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i = regex.lastIndex;
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}
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// Add all after final match
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for (; i < input.length;)
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output += input[i++];
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return output;
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}
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}
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/**
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* Lookup table to translate HTML entity codes to their byte values.
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*/
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const entityToByte = {
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"quot": 34,
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"amp": 38,
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"apos": 39,
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"lt": 60,
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"gt": 62,
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"nbsp": 160,
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"iexcl": 161,
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"cent": 162,
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"pound": 163,
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"curren": 164,
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"yen": 165,
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"brvbar": 166,
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"sect": 167,
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"uml": 168,
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"copy": 169,
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"ordf": 170,
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"laquo": 171,
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"not": 172,
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"shy": 173,
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"reg": 174,
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"macr": 175,
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"deg": 176,
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"plusmn": 177,
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"sup2": 178,
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"sup3": 179,
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"acute": 180,
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"micro": 181,
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"para": 182,
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"middot": 183,
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"cedil": 184,
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"sup1": 185,
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"ordm": 186,
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"raquo": 187,
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"frac14": 188,
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"frac12": 189,
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"frac34": 190,
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"iquest": 191,
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"Agrave": 192,
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"Aacute": 193,
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"Acirc": 194,
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"Atilde": 195,
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"Auml": 196,
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"Aring": 197,
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"AElig": 198,
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"Ccedil": 199,
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"Egrave": 200,
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"Eacute": 201,
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"Ecirc": 202,
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"Euml": 203,
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"Igrave": 204,
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"Iacute": 205,
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"Icirc": 206,
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"Iuml": 207,
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"ETH": 208,
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"Ntilde": 209,
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"Ograve": 210,
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"Oacute": 211,
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"Ocirc": 212,
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"Otilde": 213,
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"Ouml": 214,
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"times": 215,
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"Oslash": 216,
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"Ugrave": 217,
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"Uacute": 218,
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"Ucirc": 219,
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"Uuml": 220,
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"Yacute": 221,
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"THORN": 222,
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"szlig": 223,
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"agrave": 224,
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"aacute": 225,
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"acirc": 226,
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"atilde": 227,
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"auml": 228,
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"aring": 229,
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"aelig": 230,
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"ccedil": 231,
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"egrave": 232,
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"eacute": 233,
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"ecirc": 234,
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"euml": 235,
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"igrave": 236,
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"iacute": 237,
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"icirc": 238,
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"iuml": 239,
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"eth": 240,
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"ntilde": 241,
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"ograve": 242,
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"oacute": 243,
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"ocirc": 244,
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"otilde": 245,
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"ouml": 246,
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"divide": 247,
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"oslash": 248,
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"ugrave": 249,
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"uacute": 250,
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"ucirc": 251,
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"uuml": 252,
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"yacute": 253,
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"thorn": 254,
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"yuml": 255,
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"OElig": 338,
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"oelig": 339,
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"Scaron": 352,
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"scaron": 353,
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"Yuml": 376,
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"fnof": 402,
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"circ": 710,
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"tilde": 732,
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"Alpha": 913,
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"Beta": 914,
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"Gamma": 915,
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"Delta": 916,
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"Epsilon": 917,
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"Zeta": 918,
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"Eta": 919,
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"Theta": 920,
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"Iota": 921,
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"Kappa": 922,
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"Lambda": 923,
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"Mu": 924,
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"Nu": 925,
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"Xi": 926,
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"Omicron": 927,
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"Pi": 928,
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"Rho": 929,
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"Sigma": 931,
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"Tau": 932,
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"Upsilon": 933,
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"Phi": 934,
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"Chi": 935,
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"Psi": 936,
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"Omega": 937,
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"alpha": 945,
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"beta": 946,
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"gamma": 947,
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"delta": 948,
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"epsilon": 949,
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"zeta": 950,
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"eta": 951,
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"theta": 952,
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"iota": 953,
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"kappa": 954,
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"lambda": 955,
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"mu": 956,
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"nu": 957,
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"xi": 958,
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"omicron": 959,
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"pi": 960,
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"rho": 961,
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"sigmaf": 962,
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"sigma": 963,
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"tau": 964,
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"upsilon": 965,
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"phi": 966,
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"chi": 967,
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"psi": 968,
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"omega": 969,
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"thetasym": 977,
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"upsih": 978,
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"piv": 982,
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"ensp": 8194,
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"emsp": 8195,
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"thinsp": 8201,
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"zwnj": 8204,
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"zwj": 8205,
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"lrm": 8206,
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"rlm": 8207,
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"ndash": 8211,
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"mdash": 8212,
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"lsquo": 8216,
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"rsquo": 8217,
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"sbquo": 8218,
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"ldquo": 8220,
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"rdquo": 8221,
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"bdquo": 8222,
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"dagger": 8224,
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"Dagger": 8225,
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"bull": 8226,
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"hellip": 8230,
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"permil": 8240,
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"prime": 8242,
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"Prime": 8243,
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"lsaquo": 8249,
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"rsaquo": 8250,
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"oline": 8254,
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"frasl": 8260,
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"euro": 8364,
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"image": 8465,
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"weierp": 8472,
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"real": 8476,
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"trade": 8482,
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"alefsym": 8501,
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"larr": 8592,
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"uarr": 8593,
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"rarr": 8594,
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"darr": 8595,
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"harr": 8596,
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"crarr": 8629,
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"lArr": 8656,
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"uArr": 8657,
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"rArr": 8658,
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"dArr": 8659,
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"hArr": 8660,
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"forall": 8704,
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"part": 8706,
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"exist": 8707,
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"empty": 8709,
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"nabla": 8711,
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"isin": 8712,
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"notin": 8713,
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"ni": 8715,
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"prod": 8719,
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"sum": 8721,
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"minus": 8722,
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"lowast": 8727,
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"radic": 8730,
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"prop": 8733,
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"infin": 8734,
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"ang": 8736,
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"and": 8743,
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"or": 8744,
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"cap": 8745,
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"cup": 8746,
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"int": 8747,
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"there4": 8756,
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"sim": 8764,
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"cong": 8773,
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"asymp": 8776,
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"ne": 8800,
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"equiv": 8801,
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"le": 8804,
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"ge": 8805,
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"sub": 8834,
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"sup": 8835,
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"nsub": 8836,
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"sube": 8838,
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"supe": 8839,
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"oplus": 8853,
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"otimes": 8855,
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"perp": 8869,
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"sdot": 8901,
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"vellip": 8942,
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"lceil": 8968,
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"rceil": 8969,
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"lfloor": 8970,
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"rfloor": 8971,
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"lang": 9001,
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"rang": 9002,
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"loz": 9674,
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"spades": 9824,
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"clubs": 9827,
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"hearts": 9829,
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"diams": 9830,
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};
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export default FromHTMLEntity;
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