https://botwiki.org/resource/tutorial/random-image-tweet/

random-image-tweet-attribution.js

/*
  A simple Twitter bot that posts random images.
  Tutorial: https://botwiki.org/resource/tutorial/random-image-tweet/
*/

const fs = require( 'fs' ),
      path = require( 'path' ),
      Twit = require( 'twit' ),
      config = require( path.join( __dirname, 'config.js' ) ),
      images = require( path.join( __dirname, 'images.js' ) );

/*
  Your config.js file should have the following format:

  const config = {
    consumer_key:         'XXXXX',
    consumer_secret:      'XXXXX',
    access_token:         'XXXXX',
    access_token_secret:  'XXXXX'
  }

  module.exports = config;

  Here's a tutorial on how to get the API keys: https://botwiki.org/resource/tutorial/how-to-create-a-twitter-app/

  And this is an example of an image.js file:

  const images = [
    { 
      file: '01.jpg',
      source: 'http://www.example.com/01.jpg'
    },
    { 
      file: '02.jpg',
      source: 'http://www.example.com/02.jpg'
    },
    { 
      file: '03.jpg',
      source: 'http://www.example.com/03.jpg'
    }
  ];

  module.exports = images;

*/

const T = new Twit( config );

function randomFromArray( images ){
  /* Helper function for picking a random item from an array. */

  return images[Math.floor( Math.random() * images.length )];
}

function uploadRandomImage(){
  /* Function for uploading a random image to Twitter and posting it. */

  console.log( 'picking a random image...' );

  const image = randomFromArray( images );
  console.log( image );

  const imagePath = path.join( __dirname, '/images/'+ image.file );
  const imageSource = image.source

  b64content = fs.readFileSync( imagePath, { encoding: 'base64' } );

  console.log( 'uploading an image...' );

  T.post( 'media/upload', { media_data: b64content }, function ( err, data, response ) {
    if ( err ){
      console.log( 'error:', err );
    }
    else{
      console.log( 'image uploaded, now tweeting it...' );

      T.post( 'statuses/update', {
        media_ids: new Array( data.media_id_string )
      },
        function( err, data, response) {
          if (err){
            console.log( 'error:', err );
          }
          else{
            console.log( 'posted an image!' );

            /* After successfully posting an image, we can delete it.
               Keep this part commented out if you want to keep the image and reuse it later. */

            // fs.unlink( imagePath, function( err ){
            //   if ( err ){
            //     console.log( 'error: unable to delete image ' + imagePath );
            //   }
            //   else{
            //     console.log( 'image ' + imagePath + ' was deleted' );
            //   }
            // } );

          }
        }
      );
    }
  });
}

fs.readdir( __dirname + '/images', function( err, files ) {
  /* Read the content of the images folder, and tweet a random image from it. */
  if ( err ){
    console.log( 'error:', err );
  }
  else{
    let images = [];
    files.forEach( function( f ) {
      images.push( f );
    } );

    setInterval( function(){
      uploadRandomImage( images );
    }, 10000 );
  }
} );