AWS Lambda function for forwarding SNS notifications to Slack

function.js

console.log('Loading function');

const https = require('https');
const url = require('url');
// to get the slack hook url, go into slack admin and create a new "Incoming Webhook" integration
const slack_url = 'https://hooks.slack.com/services/...';
const slack_req_opts = url.parse(slack_url);
slack_req_opts.method = 'POST';
slack_req_opts.headers = {'Content-Type': 'application/json'};

exports.handler = function(event, context) {
  (event.Records || []).forEach(function (rec) {
    if (rec.Sns) {
      var req = https.request(slack_req_opts, function (res) {
        if (res.statusCode === 200) {
          context.succeed('posted to slack');
        } else {
          context.fail('status code: ' + res.statusCode);
        }
      });
      
      req.on('error', function(e) {
        console.log('problem with request: ' + e.message);
        context.fail(e.message);
      });
      
      req.write(JSON.stringify({text: JSON.stringify(rec.Sns.Message, null, '  ')})); // for testing: , channel: '@vadim'
      
      req.end();
    }
  });
};

Works! Just what I needed, thank you! 😄

How to add 2 slack urls?

How do I update "rec.Sns.Message" to be some custom text? Can I set "rec.Sns.Message" from somewhere in the AWS dashboard?

Newbie here - Can someone explain in little more detail on how to add this into a Lambda? I created a Lambda function, chose its runtime to be Nodejs 10.x and it opens with a default file of index.js. I assume I can not copy and paste this code into the index.js? Anything else special needed to call this from SNS?