gist key value store

Gist.js

class Gist {
	constructor(options) {
		this.token = options.token;
		this.gistID = options.gistID;
		this.fileName = options.filename || 'data.json';
		this.description = options.description || 'unnamed stash';

		this.cacheData = null;
	}

	get(key, callback) {
		var data = this._getCache(key);
		if (data) {
			return callback(null, key ? data[key] : data);
		}

		this._get((err, responseText, xhr) => {
			if (err) { return callback(err); }

			data = this._setCache(responseText);
			callback(null, key ? data[key] : data);
		});
	}

	set(key, value, callback) {
		this.get(null, (err, data) => {
			data[key] = value;
			this._set(data, (err, responseText, xhr) => {
				if (err) { return callback(err); }

				data = this._setCache(responseText);
				callback(null, data);
			});
		});
	}

	_setCache(responseText) {
		var json = JSON.parse(responseText);
		this.cacheData = JSON.parse(json.files[this.fileName].content);
		return this._getCache();
	}

	_getCache() {
		return this.cacheData;
	}

	_get(callback) {
		this._ajax(`https://api.github.com/gists/${this.gistID}`, 'GET', null, callback);
	}

	_set(data, callback) {
		var files = {
		};

		files[this.fileName] = {
			"content": JSON.stringify(data)
		};

		this._ajax(`https://api.github.com/gists/${this.gistID}`, 'PATCH', {
			"description": this.description,
			"files": files
		 }, callback);
	}

	_create(data, callback) {
		var files = {
		};

		files[this.fileName] = {
			"content": JSON.stringify(data)
		};

		this._ajax('https://api.github.com/gists', 'POST',
		{
			"description": this.description,
			"public": false,
			"files": files
		}, callback);
	}

	_ajax(url, method, data, callback) {
		try {
			var xhr = new (XMLHttpRequest || ActiveXObject)('MSXML2.XMLHTTP.3.0');
			xhr.open(method, url, 1);

			xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
			xhr.setRequestHeader('Content-Type', 'application/json');
			xhr.setRequestHeader('Authorization', `token ${this.token}`);

			xhr.onreadystatechange = function () {
				if (xhr.readyState > 3) {
					callback(null, xhr.responseText, xhr);
				}
			};

			xhr.send(JSON.stringify(data));
		}
		catch (e) {
			callback(e);
		}
	}
}

var gist = new Gist({
	token: 'TOKEN',
	gistID: 'GISTID'
});

gist.get(null, function (err, data) {
	console.log(err, data);
});

example

var gist = new Gist({
	token: 'YOUR TOKEN',
	gistID: 'GIST ID',
        filename: 'test.json',
        description: 'some stash name'
});

gist.set('test', '123', function (err, data) {
    gist.get('test', function (err, data) {
        console.log(data); //'123'
    });
});