cdn url generator

cdn.js

function CDN ($config) {
	this.protocol = $config.protocol;
	this.domain = $config.domain;
	this.alias = $config.alias;
	this.total = $config.total;
}
CDN.prototype = {
	getURL: function (path) {
		return this.protocol + '://' + this.alias + (this._stringToNumber(path) % this.total) + '.' + this.domain + path;
	},

	_stringToNumber: function (string) {
		return string
			.split('')
			.map(function (value) {
				return value.charCodeAt(0);
			})
			.reduce(function (a, b) {
				return a + b;
			}, 0);
	}
};

var cdn = new CDN({
	protocol: 'http',
	domain: 'google.com',
	alias: 'cdn',
	total: 5
});

console.log(cdn.getURL('/0cc175b9c0f1b6a831c399e269772661.jpeg'));
console.log(cdn.getURL('/9e3669d19b675bd57058fd4664205d2a.jpeg'));
console.log(cdn.getURL('/4a8a08f09d37b73795649038408b5f33.jpeg'));
console.log(cdn.getURL('/8277e0910d750195b448797616e091ad.jpeg'));
console.log(cdn.getURL('/b798abe6e1b1318ee36b0dcb3fb9e4d3.jpeg'));

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