誰かのツイートが消えてないか監視するやつ(GAS)

daily.js

// Queryfeed でチャンネルにツイートを垂れ流している場合のみ利用可能

var token = '{slack-token}';
var channelID = '{channel-id}';
var userName = '{user-name}'; // @realDonaldTrump とか

function myFunction() {
  var latest = Math.floor(new Date().getTime() / 1000);
  var oldest = latest - 24 * 60 * 60;
  var url    = 'https://slack.com/api/channels.history?channel=' + channelID + '&oldest=' + oldest + '&latest=' + latest;
  
  var queryfeedsHeaders = {
    Authorization: 'Bearer '+ token,
    contentType: 'application/x-www-form-urlencoded'
  };
  var queryfeedsOptions = {
    method: 'GET',
    headers: queryfeedsHeaders
  };
  
  var queryfeeds = UrlFetchApp.fetch(url, queryfeedsOptions);
  var tweets = JSON.parse(queryfeeds).messages.filter(function (message) {
    return message.attachments && message.attachments[0].author_subname === userName;
  });
  var tweetTextAndUrls = tweets.map(function (message) {
    return {
      text: message.attachments[0].text,
      url: message.attachments[0].original_url
    };
  });
  
  // Tweetを時刻降順で取得しているので、reverseして時系列どおりチェックを行う
  tweetTextAndUrls.reverse().forEach(function (textAndUrl) {
    var result = UrlFetchApp.fetch(textAndUrl.url, { muteHttpExceptions: true });
    if (result.getResponseCode() === 404) {
      notify('ツイートが消えました: ' + textAndUrl.text);
    }
  });
}

function notify (message) {
  var headers = {
    Authorization: 'Bearer '+ token,
    contentType: 'application/json'
  };
  var data = {
    channel: channelID,
    text: message
  };
  var options = {
    method: 'POST',
    headers: headers,
    payload: data
  };
  UrlFetchApp.fetch('https://slack.com/api/chat.postMessage', options);
}