Chatwork から Slackへの Webhook通知

const https = require('https');

// Slack の IncomingWebhook のURLを設定
const slack_host = "hooks.slack.com";
const slack_path = "/services/*********/*********/*****************";

exports.handler = async (event) => {

  if(!event["webhook_event"]){
    return "no event data.";
  }

  let chatevent = event["webhook_event"];

  let postData = {
    username : "chatwork-bot / " + (chatevent["from_account_id"] || chatevent["account_id"]),
    text : chatevent["body"] + (event["webhook_event_type"] == "message_updated" ? " (edited)": ""),
    icon_emoji : ":ghost:"
  };

  let data = "payload="+JSON.stringify(postData)+"";
  let options = {
    host : slack_host,
    path : slack_path,
    method : "post",
    headers: {
     "Content-type": "application/x-www-form-urlencoded",
     "Content-Length" : Buffer.byteLength(data),
    }
  };

  return new Promise((resolve, reject) => {
    let buff = [];
    let req = https.request(options, (res)=> {
      res.on('data', (chunk) => {
        buff.push(chunk);
      });
      res.on('end', () => {
        if (res.statusCode == 200) {
          resolve(Buffer.concat(buff).toString());
        } else {
          reject("request failed: " + res.statusCode + " - " + res.statusMessage + " " + Buffer.concat(buff).toString());
        }
      });
    });
    req.on('error', (e) => {
      console.error(`request error: ${e.message}`);
    });
    req.write(data);
    req.end();
  });


};

{
  "webhook_setting_id": "12345",
  "webhook_event_type": "message_created",
  "webhook_event_time": 1498028152,
  "webhook_event": {
    "message_id": "789012345",
    "room_id": 567890123,
    "account_id": 1484814,
    "body": "お客様とのランチミーティング用のお弁当、発注完了しました。",
    "send_time": 1498028120,
    "update_time": 0
  }
}

{
  "webhook_setting_id": "12345",
  "webhook_event_type": "mention_to_me",
  "webhook_event_time": 1498028130,
  "webhook_event": {
    "from_account_id": 123456,
    "to_account_id": 1484814,
    "room_id": 567890123,
    "message_id": "789012346",
    "body": "[To:1484814]おかずはなんですか？",
    "send_time": 1498028125,
    "update_time": 0
  }
}