lambda send to slack

sendToSlack.js

console.log('Loading function');

const https = require('https');
const url = require('url');
const slack_url = 'https://hooks.slack.com/services/${ここにtoken}';
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('success!!');
            } else {
                context.fail('status code: ' + res.statusCode);
            }
        });
      
        req.on('error', function(e) {
            console.log('problem with request: ' + e.message);
            context.fail(e.message);
        });

        console.log(rec);

        var slack_user = "AWS Cloud Watch";
        var slack_channel = "#sample";
        var icon = ":space_invader:";
        var str = "No Message...";
    
        try {
            var message = JSON.parse(rec.Sns.Message);
        
            var status = message.NewStateValue;
            
        if (status !== undefined) {
            if (status === "OK") {
                icon = ":kami:";
            } else if (status === "ALARM") {
                icon = ":jack_o_lantern:";
            } else {
                throw ("undefined");
            }

            str = "*[ " +
                  status +
                  " ]: " +
                  message.AlarmName +
                  "*" +
                  "\n```\n" +
                  message.NewStateReason +
                  "\n```\n";

        } else {
            var payload = message.Payload;
            if (payload !== undefined) {
                icon = payload.icon_emoji;
                slack_user = payload.username;
                slack_channel = payload.channel;
                str = payload.text;
            } else {
                throw ("undefined");
            }

        }

        } catch(e) {
        
            var str = "*" +
                    rec.Sns.Subject +
                    "*\n" +
                    rec.Sns.Message
        
        }
      
        req.write(JSON.stringify({text: str, channel: slack_channel, icon_emoji: icon, username: slack_user, link_names: 1}));
        req.end();
    }
  });
};