Redirect all public files to sites/$uri/files in Aegir 3.x

aegir_site_redirect.drush.inc

<?php

function site_redirect_provision_apache_vhost_config($uri, $data) {
  $rval[] = '';
  $rval[] = '# Redirect all files public path to sites/$uri/files';
  $rval[] = 'RewriteEngine On';
  $rval[] = "RewriteCond %{REQUEST_URI} !^/sites/$uri/files";
  $rval[] = "RewriteRule ^/sites/[^\/]*/files/(.*)$ /sites/$uri/files/$1 [R=301,L]";
  $rval[] = '';

  return $rval;
}

?>