slackNotify.js

var https = require('https');
var util = require('util');

exports.handler = function(event, context) {
    try {
        var message = JSON.parse(event.Records[0].Sns.Message);
    
        var eventType = message.Event;
        var autoScaleGroupName = message.AutoScalingGroupName;
        var description = message.Description;
        var cause = message.Cause;
    
        var slackMessage = [
            "*Event*: " + eventType,
            "*Description*: " + description,
            "*Cause*: " + cause,
        ].join("\n");
    
        var postData = {
            channel: "#notifications",
            username: "AWS Bot",
            text: "*" + autoScaleGroupName + "*",
            attachments: [{ text: slackMessage, mrkdwn_in: ["text"] }]
        };
        
        var options = {
            method: 'POST',
            hostname: 'hooks.slack.com',
            port: 443,
            path: '/services/WEBHOOKURL'
        };

        var req = https.request(options, function(res) {
          res.setEncoding('utf8');
          res.on('data', function (chunk) {
            context.done(null);
          });
        });
    
        req.on('error', function(e) {
          context.fail(e);
          console.log('problem with request: ' + e.message);
        });
    
        req.write(util.format("%j", postData));
        req.end();
    } catch (e) {
        context.fail(e)
    }
};