CyberChef/src/core/operations/EscapeUnicodeCharacters.mjs

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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation";
/**
* Escape Unicode Characters operation
*/
class EscapeUnicodeCharacters extends Operation {
/**
* EscapeUnicodeCharacters constructor
*/
constructor() {
super();
this.name = "Escape Unicode Characters";
this.module = "Default";
this.description = "Converts characters to their unicode-escaped notations.<br><br>Supports the prefixes:<ul><li><code>\\u</code></li><li><code>%u</code></li><li><code>U+</code></li></ul>e.g. <code>σου</code> becomes <code>\\u03C3\\u03BF\\u03C5</code>";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
"name": "Prefix",
"type": "option",
"value": ["\\u", "%u", "U+"]
},
{
"name": "Encode all chars",
"type": "boolean",
"value": false
},
{
"name": "Padding",
"type": "number",
"value": 4
},
{
"name": "Uppercase hex",
"type": "boolean",
"value": true
}
];
this.patterns = [
{
match: "\\\\u(?:[\\da-f]{4,6})",
flags: "i",
args: ["\\u"]
},
{
match: "%u(?:[\\da-f]{4,6})",
flags: "i",
args: ["%u"]
},
{
match: "U\\+(?:[\\da-f]{4,6})",
flags: "i",
args: ["U+"]
},
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const regexWhitelist = /[ -~]/i,
[prefix, encodeAll, padding, uppercaseHex] = args;
let output = "",
character = "";
for (let i = 0; i < input.length; i++) {
character = input[i];
if (!encodeAll && regexWhitelist.test(character)) {
// Its a printable ASCII character so dont escape it.
output += character;
continue;
}
let cp = character.codePointAt(0).toString(16);
if (uppercaseHex) cp = cp.toUpperCase();
output += prefix + cp.padStart(padding, "0");
}
return output;
}
}
export default EscapeUnicodeCharacters;