slack-s3.js

// post a message to Slack when a file is added to an S3 bucket

'use strict';

console.log('Loading function');

const aws = require('aws-sdk');
const https = require('https');

const s3 = new aws.S3({ apiVersion: '2006-03-01' });

exports.handler = (event, context, callback) => {
  const key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
  console.log('new S3 object!', key)
  
  const options = {
    hostname: 'hooks.slack.com',
    path: '<CUSTOM SLACK URL GOES HERE>',
    method: 'POST'
  }
  
  const payload = {
      "text": `New file ${key}`,
      "username": 's3-notifier',
      "icon_url": ''
  }
  
  const req = https.request(options, function (res,b , c) {
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
    });
  });
  
  req.on('error',function(e) {
    console.log('problem with request: ' + e.message);
  });

  req.write(JSON.stringify(payload));
  req.end();

};