AWS S3 node.js SDK uploaded file and folder permissions

I'm uploading file to S3 using aws-sdk package:

fs.readFile(sourceFile, function (err, data) {
    if (err) { throw err; }

    s3.client.putObject({
        Bucket: bucketName,
        Key: 'Folder/image.jpg',
        Body: data
    }, function (res) {
            console.log('Successfully uploaded file.');
        })

});

I I need to make uploaded file to be downloadable via cloudfront, if I asume right, I need to set permissions on file: Everyone Open/Download, Folder2 should be made public (via menu Make Public). So 2 questions:

1) How to set\modify permissions on uploaded file\folder?

2) How make Folder public using AWS SDK for node.js.