Microservice that tweets my most played song each week

microservice_song-of-the-week.js

module.exports = function songOfTheWeek(hook) {
  var req = require("request-promise");
  var Twitter = require('twitter');
  var lastFmUrl = "http://ws.audioscrobbler.com/2.0/?method=user.getweeklytrackchart&user=himynameisdave9&api_key="+hook.env.sotw_lastfm+"&format=json";
  var client  = new Twitter({
    consumer_key:  hook.env.sotw_ckey,
    consumer_secret:  hook.env.sotw_csecret,
    access_token_key:  hook.env.sotw_atkey,
    access_token_secret:  hook.env.sotw_atsecret
  });
  var isTweetTooLong = function(tweetContent){ return tweetContent.length > 106; };
  var getRandom = function(arr){ return arr[Math.floor(Math.random()*arr.length)]};
  var craftTweet = function( song, artist, plays, url ) {
    var playSynonyms = ["played", "played", "spun", "bumped"]; // doubled played for extra likelyhood
    var songSynonyms = ["song", "song", "track", "jam"];
    var atWith = ["at", "with"];
    var potentialTweets = [
      "My most "+getRandom(playSynonyms)+" "+getRandom(songSynonyms)+" of the past week is '"+song+"' by "+artist+", "+getRandom(atWith)+" "+plays+" plays: ",
      "This week I "+getRandom(playSynonyms)+" "+artist+"'s '"+song+"' "+plays+" times: ",
      "My top "+getRandom(songSynonyms)+" of the week is '"+song+"' by "+artist+" "+getRandom(atWith)+" "+plays+" plays: ",
      "Check out my most "+getRandom(playSynonyms)+" "+getRandom(songSynonyms)+" this week, "+artist+"'s '"+song+"' "
    ];
    var content = getRandom(potentialTweets);
    // try 10 times to correct length before moving on
    for(i=0;i<10;i++){
      if ( isTweetTooLong(content) ){
        content = getRandom(potentialTweets);
      }
    }
    return getRandom(potentialTweets)+url+" #goodtrack";
  };
  //  Promisifies tweeting
  var tweet = function( tweetContent ) {
    return new Promise( function(res, rej){
      client.post('statuses/update', { status: tweetContent }, function(e, tweet, response){
        if (e) return rej(e);
        res("Successfully tweeted the song of the week!");
      });
    });
  };

  req(lastFmUrl)
    .then(function(lastfmData){
      var topSong = JSON.parse(lastfmData).weeklytrackchart.track[0];
      var tweetContent = craftTweet( topSong.name, topSong.artist['#text'], topSong.playcount, topSong.url );
      return tweet(tweetContent);
    })
    .then(function(response){
      console.log(response);
      hook.res.end(JSON.stringify({ message: response }, true, 2))
    })
    .catch(function(e){
      console.log(e);
      hook.res.end(JSON.stringify(e, true, 2));
    })

};