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AWS Lambda function to Slack Channel hookup
var https = require('https');
var util = require('util');
exports.handler = function(event, context) {
console.log(JSON.stringify(event, null, 2));
console.log('From SNS:', event.Records[0].Sns.Message);
var postData = {
"channel": "#aws-sns",
"username": "AWS SNS via Lamda :: DevQa Cloud",
"text": "*" + event.Records[0].Sns.Subject + "*",
"icon_emoji": ":aws:"
};
var message = event.Records[0].Sns.Message;
var severity = "good";
var dangerMessages = [
" but with errors",
" to RED",
"During an aborted deployment",
"Failed to deploy application",
"Failed to deploy configuration",
"has a dependent object",
"is not authorized to perform",
"Pending to Degraded",
"Stack deletion failed",
"Unsuccessful command execution",
"You do not have permission",
"Your quota allows for 0 more running instance"];
var warningMessages = [
" aborted operation.",
" to YELLOW",
"Adding instance ",
"Degraded to Info",
"Deleting SNS topic",
"is currently running under desired capacity",
"Ok to Info",
"Ok to Warning",
"Pending Initialization",
"Removed instance ",
"Rollback of environment"
];
for(var dangerMessagesItem in dangerMessages) {
if (message.indexOf(dangerMessages[dangerMessagesItem]) != -1) {
severity = "danger";
break;
}
}
// Only check for warning messages if necessary
if (severity == "good") {
for(var warningMessagesItem in warningMessages) {
if (message.indexOf(warningMessages[warningMessagesItem]) != -1) {
severity = "warning";
break;
}
}
}
postData.attachments = [
{
"color": severity,
"text": message
}
];
var options = {
method: 'POST',
hostname: 'hooks.slack.com',
port: 443,
path: '/services/your-slack-webhook-url-info-goes-here'
};
var req = https.request(options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
context.done(null);
});
});
req.on('error', function(e) {
console.log('problem with request: ' + e.message);
});
req.write(util.format("%j", postData));
req.end();
};
@airdrummingfool

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@airdrummingfool airdrummingfool commented Apr 27, 2016

Thanks for this! Your newest revision removed all definitions of color, which causes the dreaded "Process exited before completing request" error.

EDIT: Actually it looks like you renamed to severity. So if you change line 65's color to severity, all is good!

@davesade

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@davesade davesade commented May 13, 2016

Hello and thank you for this. I confirm, that line 65 was causing troubles. Replace color with severity and it should be OK.

@razgoren

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@razgoren razgoren commented May 17, 2016

Great , after the change of line 65 it works

@terranware

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@terranware terranware commented Jun 2, 2016

Sorry for the line 65 typo. Refactor oops! I wish there were Gist notifications. If you post a response to the Medium post I can address issues faster.

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@flynnCoolblue flynnCoolblue commented Jul 18, 2016

Anyone have any idea of how to get it to format nicely into Slack? just comes out as a huge blob of JSON that is hardly readable :(

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@faceleg faceleg commented Oct 10, 2016

I had to change the request portion to:

    var payload = 'payload=' + util.format('%j', postData);
    var options = {
        method: 'POST',
        hostname: 'hooks.slack.com',
        port: 443,
        path: '/services',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': Buffer.byteLength(payload)
      }
    };

    var req = https.request(options, function(res) {
      res.setEncoding('utf8');
      res.on('data', function (chunk) {
        console.log(`BODY: ${chunk}`);
      });

      res.on('end', function () {
        context.done(null);
      });
    });

    req.on('error', function(e) {
      console.log('problem with request: ' + e.message);
    });    

    req.write(payload);
@aayushKumarJarvis

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@aayushKumarJarvis aayushKumarJarvis commented Oct 12, 2016

Can anyone please help me with this script as to how to do I alert particular owners (people) in a channel where messages are posted.

Thanks in advance

@jdrydn

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@jdrydn jdrydn commented Nov 18, 2016

@aayushKumarJarvis You can modify line 11 (text: "...") and add @channel or @here, or specific usernames.

@morugu

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@morugu morugu commented Dec 16, 2016

customized this script.

  • Add reaction words from Elastic Beanstalk
  • Enable use mention

https://github.com/morugu/aws-lambda-function-templates/blob/master/sns/sns-to-slack.js

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@makaivelli makaivelli commented Mar 1, 2018

I guess the "message" value has changed from formatted text to json-like string recently.
I had to format the message to get human-readable text in slack:

function toText(obj) {
     var formatted = '';
     Object.keys(obj).forEach(function(key) {
       formatted += key + ': ' + obj[key] + '\n\n'
     });
     return formatted;
}

var message = event.Records[0].Sns.Message;
var messageObj = JSON.parse(message);
var message = toText(messageObj);
@tretos53

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@tretos53 tretos53 commented Jun 19, 2020

@makaivelli When I use your toText function the json is formatted but not all is showed. Would you be able to help with modifying it to show the full formatted json? Is there a way to select which json keys are shown and specify the title in slack message?

I'm trying to get alerts in Slack when someone login to AWS.

The JSON looks like this:

{
    "version": "x",
    "id": "x",
    "detail-type": "x",
    "source": "x",
    "account": "x",
    "time": "x",
    "region": "x",
    "resources": [],
    "detail": {
        "eventVersion": "x",
        "userIdentity": {
            "type": "x",
            "principalId": "x",
            "arn": "x",
            "accountId": "x",
            "userName": "x"
        },
        "eventTime": "x",
        "eventSource": "x",
        "eventName": "x",
        "awsRegion": "x",
        "sourceIPAddress": "x",
        "userAgent": "x",
        "requestParameters": null,
        "responseElements": {
            "ConsoleLogin": "x"
        },
        "additionalEventData": {
            "LoginTo": "x",
            "MobileVersion": "x",
            "MFAUsed": "x"
        },
        "eventID": "x",
        "eventType": "x"
    }
}

After this is parsed by toText function I only get this in Slack:

null

version: x
id: x
detail-type: x
source: x
account: x
time: x
region: x
resources:
detail: [object Object]

My knowledge of nodejs is very limited as I mostly deal with infrastructure.

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