nodejs PoE passive skill tree encoded URL decoder

decode.js

module.exports = function(str) {
	var buf = Buffer(str.replace(/-/g, '+').replace(/_/g, '/'), 'base64');
	nodes = [];
	for (var i = 6; i < buf.length; i += 2)
		nodes.push(buf.readUInt16BE(i));
	return {
		version: buf.readInt32BE(0), // just a guess
		charClass: buf[4],
		_: buf[5], // what's this?
		nodes: nodes
	};
};

var decode = require('./decode.js');
console.log(decode('AAAAAgEBLv9QUFhjog_G2A=='));

This code is for nodejs.

If anyone is interested in similar solution for browsers, change Buffer with atob function, removing the second parameter (not that it hurts to leave it). And change buf.readUInt16BE(i) with buf.charCodeAt(i)*256+buf.charCodeAt(i+1).

You can similarly handle the version as 32bit int but it might be left as a set of 4 bytes too, we'll have to see if GGG take this to the semver direction or not.