Lambda function to make an S3 Invetory object publicly accessible

index.js

console.log('Loading function');

const aws = require('aws-sdk');
const s3 = new aws.S3({ apiVersion: '2006-03-01' });

exports.handler = (event, context, callback) => {
    // Get the object from the event and show its content type
    const bucket = event.Records[0].s3.bucket.name;
    const key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
    const params = {
        Bucket: bucket,
        Key: key,
        GrantRead: "uri=http://acs.amazonaws.com/groups/global/AllUsers"
    };
    s3.putObjectAcl(params, (err, data) => {
        return callback(err);
    });
};