Review my code for setting featured image

I have a form which the user uploads an image file to. The form takes the file and puts it in “wp-content/uploads/gravity_forms/” folder. The form then returns the URL of the file. I need to set that file as a featured image to a given post. So these are known: $post_id and $file_url.

This is my code, after reading the codex about wp_insert_attachment:

$filename			=	basename( $file_url );

$filetype			=	wp_check_filetype( $filename, null );

$wp_upload_dir			=	wp_upload_dir();

$attachment	= array(

	'guid'			=>	$wp_upload_dir['url'] . '/' . $filename,
	'post_mime_type'	=>	$filetype['type'],
	'post_title'		=>	$filename,
	'post_content'		=>	'',
	'post_status'		=>	'inherit'
);

$attach_id			=	wp_insert_attachment( $attachment, $file_url, $post_id );

require_once( ABSPATH . 'wp-admin/includes/image.php' );

$attach_data			=	wp_generate_attachment_metadata( $attach_id, $file_url );

wp_update_attachment_metadata( $attach_id, $attach_data );

set_post_thumbnail( $post_id, $attach_id );

Is it good?