AWS SDK CLI STS Usage

aws-sdk-cli-sts.js

let fs = require("fs");
let path = require("path");

let AWS = require("aws-sdk");

let cliPath = path.resolve(process.env.HOME, ".aws", "cli");

/*
NOTES: Make sure you alias the SHA1 fingerprinted cache token to the profile name
       E.G. ln -s ~/.aws/cli/cache/09a19nczc3zvza58zrftetyfso7yw9d48u6ugsel.json profile

       Then run your program with the specified profile alias as an envrionemnt variable
       E.G. AWS_SDK_CLI_STS_PROFILE=profile node app.js
*/
module.exports = function() {
  var sts;

  try {
    var cliString = fs.readFileSync(path.resolve(cliPath, process.env.AWS_SDK_CLI_STS_PROFILE), "utf8");
    var cliObject = JSON.parse(cliString);
  
    sts = new AWS.STS().credentialsFrom(cliObject);
  }
  catch (e) {
    // use defaults...
  }

  return sts;
};

index.js

var AWS = require("aws-sdk");

var cliSTS = require("./aws-sdk-cli-sts");
AWS.config.credentials = cliSTS();

var s3 = new AWS.S3();

s3.listBuckets({}, function(err, data) {
  if (err) console.log(err);
  if (data) console.log(data);
});