Webtask & Twitter application authorization example.

twitter-proxy.js

/*  
 *  docs
 *    Webtask - https://webtask.io
 *    Twitter - https://dev.twitter.com/oauth/application-only
 *  note
 *    Here is an easy way to base64 your consumer key and consumer secret
 *    from the command line: 
 *      
 *    echo -n "CONSUMER_KEY:CONSUMER_SECRET" | base64
 *
 */
'use latest';

import https from "https";
import querystring from "querystring";

module.exports = function (context, response) {

  const options = {
    hostname: 'api.twitter.com',
    path: '/oauth2/token',
    method: 'POST',
    headers: {
      'Authorization': `Basic ${context.secrets.consumer_key_secret_base64}`,
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
      'Accept':'gzip'
    }
  };
  
  const req = https.request(options, (res) => {
    res.setEncoding('utf8');
    
    let data = '';
    
    res.on('data', (chunk) => {
      console.log(`body: ${chunk}`);
      data += chunk
    });
    
    res.on('end', () => {
      console.log('response has ended');
      response(null, JSON.parse(data))
    });
    
  });
  
  req.on('error', (e) => {
    response(`error: ${e.message}`, null)
  });
  
  // write grant_type=client_credentials into request body
  req.write('grant_type=client_credentials');
  req.end();
};