deobfuscator for protondb report ids

gistfile1.txt

// https://www.protondb.com/data/counts.json
var get_token_from_counts = function(counts) {
	return [counts.reports, counts.timestamp];
};

var token = [..., ...];

var deobfuscate = function(appid, token) {
	return deobfuscate_sub(appid, token[0], token[1]);
};

var numberify = function(string) {
	string += "/";

	var output = 0;

	for (var i = 0; i < string.length; i++) {
		output = (output << 5) - output + string.charCodeAt(i) | 0;
	}

	return Math.abs(output);
};

var deobfuscate_sub = function(appid, reports, timestamp) {
	var func = null;

	if (appid % 2 === 1) {
		func = odd_func;
	} else {
		func = even_func;
	}

	return numberify(func(appid, reports, timestamp));
};

var even_func = function(a1, a2, a3) {
	return (a1 * (a2 % a3)) + "?" + (a1 * a3);
};

var odd_func = function(a1, a2, a3) {
	return a2 + ")" + (a1 * (a2 % a3));
};

// https://www.protondb.com/data/reports/app/{deobfuscated id}.json