function hook_file_url_alter in CDN 6.2

Alter the URL to a file.

This hook is called from file_create_url(), and is called fairly frequently (10+ times per page), depending on how many files there are in a given page. If CSS and JS aggregation are disabled, this can become very frequently (50+ times per page) so performance is critical.

This function should alter the path, if it wants to rewrite the file URL. If it does so, no other hook_file_url_alter() implementation will be allowed to further alter the path.

Parameters

$path: A string containing the Drupal path (i.e. path relative to the Drupal root directory) of the file to generate the URL for.

1 function implements hook_file_url_alter()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

cdn_file_url_alter in ./cdn.module

Implementation of hook_file_url_alter().

2 invocations of hook_file_url_alter()

_cdn_css_file_create_url in ./cdn.basic.css.inc

Generate CDN file URL without file_create_url() if the core patch has not been applied.

_cdn_html_alter_file_url in ./cdn.fallback.inc

Alter the file URLs in a piece of HTML given a regexp pattern and some additional parameters.

File

patches/hook_file_url_alter.php, line 25

Documentation for the hook_file_url_alter() hook.

Code

function hook_file_url_alter(&$path) {
  global $user;

  // User 1 will always see the local file in this example.
  if ($user->uid == 1) {
    return;
  }
  $cdn1 = 'http://cdn1.example.com';
  $cdn2 = 'http://cdn2.example.com';
  $cdn_extensions = array(
    'css',
    'js',
    'gif',
    'jpg',
    'jpeg',
    'png',
  );

  // Most CDN's don't support private file transfers without a lot of hassle,
  // so don't support this in the common case.
  if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PRIVATE) {
    return;
  }

  // Serve files without extension and files with one of the CDN extensions
  // from CDN 1, all others from CDN 2.
  $pathinfo = pathinfo($path);
  if (!array_key_exists('extension', $pathinfo) || in_array($pathinfo['extension'], $cdn_extensions)) {
    $path = $cdn1 . '/' . $path;
  }
  else {
    $path = $cdn2 . '/' . $path;
  }
}