CyberChef/src/core/operations/UnescapeUnicodeCharacters.mjs

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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation";
import Utils from "../Utils";
/**
* Unescape Unicode Characters operation
*/
class UnescapeUnicodeCharacters extends Operation {
/**
* UnescapeUnicodeCharacters constructor
*/
constructor() {
super();
this.name = "Unescape Unicode Characters";
this.module = "Default";
this.description = "Converts unicode-escaped character notation back into raw characters.<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>\\u03c3\\u03bf\\u03c5</code> becomes <code>σου</code>";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
"name": "Prefix",
"type": "option",
"value": ["\\u", "%u", "U+"]
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const prefix = prefixToRegex[args[0]],
regex = new RegExp(prefix+"([a-f\\d]{4})", "ig");
let output = "",
m,
i = 0;
while ((m = regex.exec(input))) {
// Add up to match
output += input.slice(i, m.index);
i = m.index;
// Add match
output += Utils.chr(parseInt(m[1], 16));
i = regex.lastIndex;
}
// Add all after final match
output += input.slice(i, input.length);
return output;
}
}
/**
* Lookup table to add prefixes to unicode delimiters so that they can be used in a regex.
*/
const prefixToRegex = {
"\\u": "\\\\u",
"%u": "%u",
"U+": "U\\+"
};
export default UnescapeUnicodeCharacters;