slack_serverless_handler.js

var buildReply = async function (msg, token, thread, url) {
    var channel = msg.event.channel
    // Check if URL exists
    if (url.length > 0) {
       // Load the AWS SDK for Node.js
       var AWS = require('aws-sdk');
       AWS.config.update({
            region: 'us-east-1'
       })
       // Create an SQS service object
       var sqs = new AWS.SQS({
           apiVersion: '2012-11-05'
       })
       // Payload for SQS.
       var params = {
           MessageAttributes: {
               "Thread": {
                     DataType: "String",
                     StringValue: thread
               },
               "Channel": {
                     DataType: "String",
                     StringValue: channel
               },
               "URL": {
                     DataType: "String",
                     StringValue: url
               },
               "Token": {
                     DataType: "String",
                     StringValue: token
               }
          },
          MessageBody: `Message via SQS from Slack bot`,
          QueueUrl: "https://sqs.us-east-1.amazonaws.com/<some number>/summarizer-slack-to-summarizer"
       };


       // Send the payload to SQS
       let sm = await sqs.sendMessage(params).promise();
       // Empty reply
       reply = ``
    }
    // No URL, show a help message
    else {
       reply = 'Type `@tldr` alongside a URL, or as thread to a URL. Direct message works too.'
    }
    return reply
}