hook_file_url_alter(&$uri)
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 URI, if it wants to rewrite the file URL.
Parameters
$uri: The URI to a file for which we need an external URL, or the path to a shipped file.
Related topics
- Hooks
- Define functions that alter the behavior of Drupal core.
File
- core/lib/Drupal/Core/File/file.api.php, line 57
- Hooks related to the File management system.
Code
function hook_file_url_alter(&$uri) {
$user = \Drupal::currentUser();
// User 1 will always see the local file in this example.
if ($user->id() == 1) {
return;
}
$cdn1 = 'http://cdn1.example.com';
$cdn2 = 'http://cdn2.example.com';
$cdn_extensions = array('css', 'js', 'gif', 'jpg', 'jpeg', 'png');
// Most CDNs don't support private file transfers without a lot of hassle,
// so don't support this in the common case.
$schemes = array('public');
$scheme = file_uri_scheme($uri);
// Only serve shipped files and public created files from the CDN.
if (!$scheme || in_array($scheme, $schemes)) {
// Shipped files.
if (!$scheme) {
$path = $uri;
}
// Public created files.
else {
$wrapper = \Drupal::service('stream_wrapper_manager')->getViaScheme($scheme);
$path = $wrapper->getDirectoryPath() . '/' . file_uri_target($uri);
}
// Clean up Windows paths.
$path = str_replace('\\', '/', $path);
// Serve files with one of the CDN extensions from CDN 1, all others from
// CDN 2.
$pathinfo = pathinfo($path);
if (isset($pathinfo['extension']) && in_array($pathinfo['extension'], $cdn_extensions)) {
$uri = $cdn1 . '/' . $path;
}
else {
$uri = $cdn2 . '/' . $path;
}
}
}
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