Storage.js

Storage.js

Storage.prototype.get = function (key) {
	try {
		var result = JSON.parse(this.getItem(key));

		if ((result !== null) && (result.hasOwnProperty('expiration') === true)) {
			if ((result.expiration >= (new Date())) || (result.expiration == null)) {
				return result.value || null;
			}

			this.removeItem(key);
		} else {
			return this.getItem(key);
		}
	} catch (exception) {
		console.error(exception);
	}

	return null;
};

Storage.prototype.set = function (key, value, expiration) {
	if (Number.isFinite(expiration) === true) {
		expiration = (new Date()) + (expiration * 1000);
	}

	return this.setItem(key, JSON.stringify({
		value: value,
		expiration: expiration
	}));
};