timesという名前がつくチャンネルに招待してくれるslack botのGAS

slack_invite_bot.js

var legacyToken = "xoxb-xxx";
var botUserId = "D020MGLFK0A"; 
var targetChannelPatterns = ['times_.*'];

// WebHook用 Hook発言をしたユーザー情報を取得し、全てのchannelにinviteしてあげる
function doPost(e){
  var text = e.parameter.text.substring(e.parameter.trigger_word.length).trim();
  
  if(text != "招待して"){
    return postMessage(e.parameter.channel_id, "ちょっとよくわからないです");
  }
  var message1 = "全timesチャンネルに招待しますね！";
  postMessage(e.parameter.channel_id, message1); 
  
  var userId = e.parameter.user_id;
  var channels = fetchChannles();
  var resultMessage = inviteAll(userId, channels);
  return postMessage(e.parameter.channel_id, resultMessage); 
}

function postMessage(channelId, message){
  var postMessageUrl = 'https://slack.com/api/chat.postMessage';
  var payload =
      {
        "token" : legacyToken,
        "channel" : channelId,
        "text": message
      };
  var options =
      {
        "method" : "post",
        "payload" : payload
      };
  var data = UrlFetchApp.fetch(postMessageUrl, options);
  var json = JSON.parse(data);
  return json;
}

function fetchChannles() {
  var channelsUrl = 'https://slack.com/api/conversations.list?token=' + legacyToken + '&exclude_archived=1&pretty=1&limit=200';
  var data = UrlFetchApp.fetch(channelsUrl);
  var json = JSON.parse(data);
  var channels = json.channels;
  var filterdChannels = [];
  
  for (var i = 0; i < channels.length; i++) {
    var channel = channels[i];
    var exclude = true;
    
    for (var j = 0; j < targetChannelPatterns.length; j++) {
      var targetPattern = targetChannelPatterns[j]
      pattern = new RegExp(targetPattern);
      
      if (channel.name.match(pattern)) {
        exclude = false;
        break;
      }
    }
    
    if (!exclude) {
      filterdChannels.push(channel);
    }
  }
  return filterdChannels;
}

function getChannnelListString(channels) {
  var message = ':zap:timesチャンネル一覧:zap:\n';
  
  for (var i = 0; i < channels.length; i++) {
    var channel = channels[i];
    message += '<#' + channel.id + '|' + channel.name +  '>';
    message += '\n';
  }
  return message;
}

function inviteAll(userId, channels){
  var cnt = 0;
  var error = 0;
  
  for (var i = 0; i < channels.length; i++) {
    var channel = channels[i];
    var joinChannelUrl = 'https://slack.com/api/conversations.invite';
    var payload =
        {
          "token" : legacyToken,
          "channel" : channel.id,
          "users": userId
        };
    var options =
        {
          "method" : "post",
          "payload" : payload
        };
    var data = UrlFetchApp.fetch(joinChannelUrl, options);
    var json = JSON.parse(data);
    
    if(json.ok) {
      cnt++;
    } else {
      error++;
    }
  }
  return cnt + "個のチャンネルに招待されました\n" + error + "個のチャンネルにはすでに入っています";
}