I have a Drupal site where there are few CDN links. Iwas thinking of adding SRI hashes to those links.

How can I do that?

Every solution I tried requires to add a custom module, but I don't know how these things work.

Somehow, I managed to create a custom module which creates a Hello page. I just followed a tutorial. Can I add hashes in it?


name: SRI Hash
type: module
description: 'SRI Hash'
package: custom
version: 8.x
core: 8.x


  path: '/sri_hash'
    _controller: '\Drupal\sri\Controller\SriController::scripthash'
    _title: 'SRI Hash'
      _permission: 'access content'


namespace Drupal\sri\Controller;

class SriController {
   * Returns a simple page.
   * @return array
   *   A simple renderable array.
  public function scripthash() {
    $element = array(
      '#markup' => 'This is a page !',
    return $element;

Is there another way to do it?

  • 3
    I think you are overcomplicating this :-) Usually external assets are defined in *.libraries.yml files of your theme/module, and you can add the SRI hash in the attributes section of the asset, see example
    – Hudri
    Jun 2, 2022 at 8:18
  • 2
    Better example link: drupal.org/docs/theming-drupal/…
    – Hudri
    Jun 2, 2022 at 8:23
  • @Hudri thanks ... i have added the integrity hash, but after adding site breaks down,, shows message website encountered an error ! I have cleared the cache also, but it still shows the error, site works if i remove integrity hash. Jun 3, 2022 at 7:32
  • We don’t know what you did because you haven’t shown us the code or the error message.
    – cilefen
    Jun 3, 2022 at 10:57


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