GOOGLE CALENDAR SLACK BOT

google_calendar_slack_bot_gas.js

function doPost(e) {
  var text = e.parameter.text;  
  var channel = e.parameter.channel_name;
  //TODO validation error handling
  //textには次のような文字列が入ることを期待していて、日付を抽出しようとしている => @yotei 2018/05/30  
  var targetDate = text.replace('@yotei ', '');

  postGoogleCalendar(channel, targetDate);
  return HtmlService.createHtmlOutput('ok');
}

function postGoogleCalendar(channelName, targetDateString) {
  var s = listupEvent("xxxxxx@gmail.com", targetDateString); // a.GoogleカレンダーのID  
  var message = "\n■" + targetDateString +"の予定\n" + s; // b.メッセージの見出し

  var payload = {
    "text" : message,
    "channel" : channelName,
    "icon_emoji" : ":cal:",
    "username" : "google calendar",
  }
  postSlack(payload);
}

function listupEvent(cal_id, targetDateString)
{
  var list = "";
  var cal = CalendarApp.getCalendarById(cal_id);
  var events = cal.getEventsForDay(new Date(targetDateString));
  
  if (events.length === 0) {
    return "予定はありません＼(^o^)／";
  }
  
  for(var i=0; i < events.length; i++){
    s = "";
    if (events[i].isAllDayEvent()) {
      s += "終日 ";
    } else {
      s += Utilities.formatDate(events[i].getStartTime(),"GMT+0900","HH:mm");
      s += Utilities.formatDate(events[i].getEndTime(), "GMT+0900","~ HH:mm  ");
    }
    s += "|" + events[i].getTitle();
    list += s + "\n";
  }

  return list;
}

function postSlack(payload)
{
  var options = {
    "method" : "POST",
    "payload" : JSON.stringify(payload)
  }
  var url = "https://hooks.slack.com/services/xxxx/xxxx/xxxxx"; //e.g. slack incoming webhook.
  //TODO error handling
  var response = UrlFetchApp.fetch(url, options);
}