oke.js

const p = require('phin');

// input your slack webhook
const reqURL = `https://hooks.slack.com/services/xxxxxxxxxxxxxxxxxxxxxxxxxxx`;

async function notifySlack(instanceInfo) {

  const message = {
    'channel': 'aws-alarm',
    'username': 'AWS_State_Reporting_Bot',
    'text': 'EC2 State is changing',
    'attachments': [{
      'color': '#8697db',
      'fields': [
        {
          'title': 'EC2',
          'value': `EC2 Instance ID : ${instanceInfo.instanceId}\nState : ${instanceInfo.state}\nTime : ${instanceInfo.time}\nRegion : ${instanceInfo.region}`,
          'short': false
        }
      ]
    }]
  };

  return p({
    url: reqURL,
    method: 'POST',
    data: message
  });
}


exports.handler = async (event, context, callback) => {
    console.log(event);
    
    const instanceInfo = {
        instanceId: event.detail["instance-id"],
        state: event.detail.state,
        time: event.time,
        region: event.region,
        detailType: event["detail-type"]
    }
    
    console.log(instanceInfo);
    
    const req = await notifySlack(instanceInfo);
    
    const response = {
        statusCode: 200,
        body: JSON.stringify(instanceInfo),
    };
    
    return response;
};