Request a bearer token from Twitter with Meteor

bearer_token_request.js

import Twitter from 'twitter';
import Future from 'fibers/future';

const { consumerKey, secret } = Meteor.settings.private.oAuth.twitter;
let bearerToken = null;

function bearerTokenRequestString(consumerKey, secret){
	const rawKeyEncode = (str) => {
		return encodeURIComponent(str) //return RFC 1738 encoded string
	    .replace(/!/g, '%21')
	    .replace(/'/g, '%27')
	    .replace(/\(/g, '%28')
	    .replace(/\)/g, '%29')
	    .replace(/\*/g, '%2A')
	}
	const string = `${rawKeyEncode(consumerKey)}:${rawKeyEncode(secret)}`;
	const buffer = new Buffer(string);
	const toBase64 = buffer.toString('base64'); //encode string using base64
	return toBase64;
}

function requestBearerToken(consumerKey, secret, callback){
	let fut = new Future();
	HTTP.call('POST', 'https://api.twitter.com/oauth2/token', { //setup post request as required by twitter
		content: 'grant_type=client_credentials',
		headers: {
			'Authorization': `Basic ${bearerTokenRequestString(consumerKey, secret)}`,
			'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
		}import Twitter from 'twitter';
import Future from 'fibers/future';

const { consumerKey, secret } = Meteor.settings.private.oAuth.twitter;
let bearerToken = null;

function bearerTokenRequestString(consumerKey, secret){
	const rawKeyEncode = (str) => {
	  return encodeURIComponent(str) //return RFC 1738 encoded string
	    .replace(/!/g, '%21')
	    .replace(/'/g, '%27')
	    .replace(/\(/g, '%28')
	    .replace(/\)/g, '%29')
	    .replace(/\*/g, '%2A')
	}
	const string = `${rawKeyEncode(consumerKey)}:${rawKeyEncode(secret)}`;
	const buffer = new Buffer(string);
	const toBase64 = buffer.toString('base64'); //encode string using base64
	return toBase64;
}

function requestBearerToken(consumerKey, secret, callback){
	let fut = new Future();
	HTTP.call('POST', 'https://api.twitter.com/oauth2/token', { //setup post request as required by twitter
		content: 'grant_type=client_credentials',
		headers: {
			'Authorization': `Basic ${bearerTokenRequestString(consumerKey, secret)}`,
			'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
		}
	},
	(err, res) => {
		if (!err) {
			fut.return(res);
	  } else {
	  	fut.throw(err);
	  }
	})
	fut.wait().statusCode == 200
		? callback(null, fut.wait().data.access_token)
		: callback(fut.wait())
}

requestBearerToken(consumerKey, secret, (err, res) => {
	if (!err) {
		bearerToken = res;
  } else {
  	throw
		bearerToken = null;
  }
})

export const client = new Twitter({
	consumer_key: consumerKey,
  consumer_secret: secret,
  bearer_token: bearerToken
})

	},
	(err, res) => {
		if (!err) {
			fut.return(res);
	  } else {
	  	fut.throw(err);
	  }
	})
	fut.wait().statusCode == 200
		? callback(null, fut.wait().data.access_token)
		: callback(fut.wait())
}

requestBearerToken(consumerKey, secret, (err, res) => {
	if (!err) {
		bearerToken = res;
  } else {
  	throw
		bearerToken = null;
  }
})

export const client = new Twitter({
	consumer_key: consumerKey,
  consumer_secret: secret,
  bearer_token: bearerToken
})