Use this with the delicious brains S3 offset plugin. Will create the metadata for all the assets in the Wordpress site

s3 migration

<?php 
include('wp/wp-load.php');


class S3{
	
	private $bucket = 'bucket-cdn';
	private $directories = 'content/uploads/';
	private $sites = '';
	private $post_id = null;
	private $blog;

	public function __construct($post_id = null, $blog = 1){
		
		if (empty($post_id)){
			return false;
		}
		
		$this->post_id = $post_id;
		$this->blog = $blog;

		$this->init();

	}

	public function init(){
		
		$this->metadata = $this->get_metadata();

	}

	public function get_metadata(){

		$metadata = get_metadata('post', $this->post_id, '_wp_attached_file', true);
		$directory = $this->directories;

		if($this->blog > 1){
			$directory  = $directory . $this->sites . $this->blog.'/';
		}
		$meta_arr = array(
			'bucket'=> $this->bucket,
			'key' => $directory.$metadata,
			'region' => '',
		);

		return $meta_arr;

	}


}

$blogs = array(1);

foreach ($blogs as $blog) {

//restore_current_blog();

//switch_to_blog($blog);

echo '<h1>'.get_bloginfo('name').'</h1>';

$the_query = new WP_Query(array( 'post_type'=>'attachment',  'post_status' => 'inherit', 'posts_per_page' => -1) );

	
	if ( $the_query->have_posts() ){

		 while ( $the_query->have_posts() ){ 
		 	$the_query->the_post();
			
		 	$meta = new S3($post->ID, $blog);
		 	
		 	delete_post_meta( $post->ID, 'amazonS3_info' );

		 	add_post_meta( $post->ID, 'amazonS3_info', $meta->metadata );

		 	print_r($meta->metadata);
		 	echo '<br>';
		}

	}

}


?>