Twitter Bot managed By Google App Script

gasTwitterBot.gs

// ref: https://gist.github.com/M-Igashi/750ab08718687d11bff6322b8d6f5d90

// 認証用インスタンス
var twitter = TwitterWebService.getInstance(
  '', // 作成したアプリケーションのConsumer Key
  ''  // 作成したアプリケーションのConsumer Secret
);


/// main methods ///


// 認証
function authorize() {
  twitter.authorize();
}

// 認証解除
function reset() {
  twitter.reset();
}

function init() {
  const time = getNextTime(0);
  ScriptApp.newTrigger("createEveryHoursScheduler").timeBased().at(time).create();
}

function postTweet() {
  const service  = twitter.getService();
  const tweet = selectRandomTweet();
  const response = service.fetch('https://api.twitter.com/1.1/statuses/update.json', {
    method: 'post',
    payload: { status: tweet }
  });
}

function deleteAllTriggers() {
  var triggers = ScriptApp.getProjectTriggers();
  for(var i=0; i < triggers.length; i++) {
    ScriptApp.deleteTrigger(triggers[i]);
  }
}


//// sub methods ////


function authCallback(request) {
  return twitter.authCallback(request);
}

function createEveryHoursScheduler() {
  ScriptApp.newTrigger("schedulePost").timeBased().everyHours(1).create();
}

function schedulePost() {
  const scheduledTime = getScheduledTime();
  if (!validateHourRange(scheduledTime.getHours())) return;

  ScriptApp.newTrigger('execute').timeBased().at(scheduledTime).create();
}

// 投稿は9:00~21:00の間
function validateHourRange(hour) {
  if (hour >= 9 || hour <= 21) return true;
  return false;
}

// 現在から最大59分後の時間が返る
function getScheduledTime() {
  var setTime = new Date();
  const minutes = setTime.getMinutes();
  const randomMinute = Math.floor(Math.random() * 59);

  setTime.setMinutes(minutes + randomMinute);
  return setTime;
}

// NOTE: 例えば実行時刻が「12:11」だった場合、「13:引数」を返す
function getNextTime(minute) {
  var setTime = new Date();
  setTime.setHours(setTime.getHours() + 1);
  setTime.setMinutes(minute);
  return setTime;
}

function execute() {
  postTweet();
  // 実行後、自身の不要なトリガーを削除する
  deleteTrigger("execute");
}

function deleteTrigger(targetTrigger) {
  var triggers = ScriptApp.getProjectTriggers();
  for(var i=0; i < triggers.length; i++) {
    if (triggers[i].getHandlerFunction() == targetTrigger) {
      ScriptApp.deleteTrigger(triggers[i]);
    }
  }
}

function selectRandomTweet() {
  const sheetData = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Tweet");
  const lastRow = sheetData.getLastRow();
  const selectedRow = Math.floor(Math.random() * lastRow) + 1; // 1 ~ 最終行までのどれか
  const selectedTweet = sheetData.getRange(selectedRow, 1).getValue();

  return selectedTweet;
}

Japanese Document: Qiita