twitter bot with tumblr image http://a4typo.tumblr.com/

a4typobot.js

'use strict';

// Tumblr Authenticate
const Tumblr = require('tumblr.js');
const tumblr = Tumblr.createClient({
  consumer_key:    '...',
  consumer_secret: '...',
  token:           '...',
  token_secret:    '...'
});

// Twitter Authenticate
const Twit = require('twit');
const twitter = new Twit({
  consumer_key:         '...',
  consumer_secret:      '...',
  access_token:         '...',
  access_token_secret:  '...'
})

const fs = require('fs');
const request = require('request');
const CronJob = require('cron').CronJob;


// =============================
// Tweet with image from tumblr
// =============================
let randomPost = function() {
  tumblr.userInfo((err, data) => {
    const offset = Math.floor(Math.random() * data.user.blogs[0].total_posts); // number of posts for tumblr

    tumblr.blogPosts('a4typo.tumblr.com', {limit: 1, offset: offset}, (err, data) => {
      const imageURL = data.posts[0].photos[0].alt_sizes[0].url;
      const postText = data.posts[0].summary;
      const postURL  = data.posts[0].short_url;

      request({method: 'GET', url: imageURL, encoding: null}, (err, res, body) => {
        if(err) console.log(err);
        if(!err && res.statusCode === 200) {

          fs.writeFile('tmp.jpg', body, 'binary', (err) => {
            const b64content = fs.readFileSync('tmp.jpg', {encoding: 'base64'});

            twitter.post('media/upload', {media_data: b64content}, (err, data, response) => {
              const mediaIdStr = data.media_id_string;
              let altText = postText;
              if(altText === '') altText = '大判プリンターを持たない人たちが、それでも大きな文字を印刷したかった結果';
              const meta_params = { media_id: mediaIdStr, alt_text: { text: altText } };

              twitter.post('media/metadata/create', meta_params, (err, data, response) => {
                if(err) console.log(err);
                if(!err) {
                  const tweetText = postText + '\n' + postURL;
                  const params = {status: tweetText, media_ids: [mediaIdStr]};

                  twitter.post('statuses/update', params, (err, data, response) => {
                  });
                }
              });
            });
          });
        }
      });
    });
  });
};

// =============================
// Tweet every 2 hour
// =============================
new CronJob('00 */2 * * *', randomPost, null, true, 'Asia/Tokyo');


// =============================
// Retweet when someone tweet with '#A4タイポグラフィ' hashtag
// =============================
const stream = twitter.stream('statuses/filter', {track: '#A4タイポグラフィ'});
stream.on('tweet', (tw) => {
  twitter.post('statuses/retweet/:id', {id: tw.id_str}, (err, data, response) => {
  })
});