aws.js

const AWS = require('aws-sdk');

// Configure the AWS SDK with your IAM user's credentials
AWS.config.update({
  accessKeyId: 'YOUR_ACCESS_KEY_ID',
  secretAccessKey: 'YOUR_SECRET_ACCESS_KEY',
  region: 'us-east-1' // Replace with your desired AWS region
});

const sts = new AWS.STS();

const params = {
  RoleArn: 'arn:aws:iam::YOUR_ACCOUNT_ID:role/YOUR_ROLE_NAME',
  RoleSessionName: 'YourSessionName' // Provide a session name
};

sts.assumeRole(params, (err, data) => {
  if (err) {
    console.error('Error assuming role:', err);
    return;
  }

  // Temporary security credentials
  const { AccessKeyId, SecretAccessKey, SessionToken } = data.Credentials;

  // Use these temporary credentials to access S3
  const s3 = new AWS.S3({
    accessKeyId: AccessKeyId,
    secretAccessKey: SecretAccessKey,
    sessionToken: SessionToken
  });

  // Now you can use the S3 client to interact with S3
  s3.listBuckets((s3Err, s3Data) => {
    if (s3Err) {
      console.error('Error listing S3 buckets:', s3Err);
    } else {
      console.log('S3 Buckets:', s3Data.Buckets);
    }
  });
});