ChatWorkから、Slackにメッセージを転送するGoogle Apps Scripts

var CHATWORK_TOKEN = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';//★ChatWork APIのトークン
var MY_ID = 'XXXXXXXXX';//★自分のチャットワークID
var ROOM_ID = ["XXXXXXXX", "XXXXXXXX"];//★チャットワークのルームID
var SLACK_TOKEN = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';//★Slack APIのトークン

function chatworkToSlack(){
 var params = {
   headers : {"X-ChatWorkToken" : CHATWORK_TOKEN},
   method : "get"
 };
 
 for (var i = 0; i < ROOM_ID.length; i ++) {
   var url = "https://api.chatwork.com/v2/rooms/" + ROOM_ID[i] + "/messages?force=0";
   var strRespons = UrlFetchApp.fetch(url, params);
   if (strRespons != "") {
     var json = JSON.parse(strRespons.getContentText());
     if(json == "") return;
     for each(var obj in json){
         var message = '';
         for(var i in json){
           message = message + json[i].account.name + "\n```" + json[i].body + "```\n";
           postMessage(message);
       }
     }
   }
 }
}


function postMessage(message) {
 var url        = 'https://slack.com/api/chat.postMessage';
 var token      = SLACK_TOKEN;
 var channel    = "#XXXXXXXXXXXXXXXXX"; // ChatWorkのチャネル
 var username   = "ChatWork";
 var parse      = 'full';
 var icon_emoji = ':robot_face:';
 var method     = 'post';
 var payload = {
 'token'      : token,
 'channel'    : channel,
 'text'       : message,
 'username'   : username,
 'parse'      : parse,
 'icon_emoji' : icon_emoji
 };
 var params = {
   'method' : method,
   'payload' : payload
 };
 var response = UrlFetchApp.fetch(url, params);
}

function test_postMessage() {
  postMessage("ハロー");
}

function test_checkMessage() {
 Logger.log("start test_checkMessage");
 var params = {
   headers : {"X-ChatWorkToken" : CHATWORK_TOKEN},
   method : "get"
 };
 
 for (var i = 0; i < ROOM_ID.length; i ++) {
   var url = "https://api.chatwork.com/v2/rooms/" + ROOM_ID[i] + "/messages?force=0";
   var strRespons = UrlFetchApp.fetch(url, params);
 Logger.log("strRespons");
       Logger.log(strRespons);
   if (strRespons != "") {
     var json = JSON.parse(strRespons.getContentText());
     if(json == "") return;
     for each(var obj in json){
       Logger.log(obj.body);
         var message = '';
         for(var i in json){
           message = message + json[i].account.name + "\n```" + json[i].body + "```\n";
       Logger.log(message);
           postMessage(message);
         }
     }
   }
 }  
}