Add caching headers to existing S3 Object

Problem :- How to add caching headers to an existing amazon S3 object?

Background:- Yes, I know. I should have done it when I had uploaded those files. However they are already there and now we need to add caching control headers to our already uploaded objects.

Simple solution :- Use cloud Berry explorer or some such tool. 

Programmer's solution:- Looks like using aws-sdk copy_object does the trick.

Code sample

    error_reporting(-1);
    require_once 'sdk.class.php';

    // copy S3 object
    // Instantiate the AmazonS3 class
    $options = array("key" => "aws-key" , "secret" => "aws-secret") ;


    $s3 = new AmazonS3($options);
    $bucket = "bucket.3mik.com" ;


    $exists = $s3->if_bucket_exists($bucket);
    if(!$exists) {
        trigger_error("S3 bucket does not exists \n" , E_USER_ERROR);
    }

    $name = "cows-and-aliens.jpg" ;
    echo " change headers for $name  \n" ;
    $source = array("bucket" => $bucket, "filename" => $name);
    $dest = array("bucket" => $bucket, "filename" => $name);

    //caching headers
    $offset = 3600*24*365;
    $expiresOn = gmdate('D, d M Y H:i:s \G\M\T', time() + $offset);
    $headers = array('Expires' => $expiresOn, 'Cache-Control' => 'public, max-age=31536000');

    $meta = array('acl' => AmazonS3::ACL_PUBLIC, 'headers' => $headers);

    $response = $s3->copy_object($source,$dest,$meta);
    if($response->isOk()){
        printf("copy object done \n" );

    }else {
        printf("Error in copy object \n" );
    }