Is it possible to set up subresource integrity?

I need to add subresource integrity (SI) to my squarespace site, but I have no idea how to do that or if it is even possible. If you aren't familiar with subresource integrity, it is simply including a hash of a javascript file inside the javascript tag that loads that library. The browser uses the hash to ensure that the library being downloaded hasn't changed since the hash was generated.

So for example, here is the tag that loads one of the SquareSpace libraries that my site uses:

On 10/18/2021 at 7:48 AM, michaelmolloy said:

I need to add subresource integrity (SI) to my squarespace site, but I have no idea how to do that or if it is even possible. If you aren't familiar with subresource integrity, it is simply including a hash of a javascript file inside the javascript tag that loads that library. The browser uses the hash to ensure that the library being downloaded hasn't changed since the hash was generated.

So for example, here is the tag that loads one of the SquareSpace libraries that my site uses:

 

<script type="text/javascript" crossorigin="anonymous" src="//assets.squarespace.com/@sqs/polyfiller/1.2.2/modern.js"></script>

I need to get an "integrity" attribute in there somehow. Suggestions?

We can't edit how the squarespace assets is loaded, only the one we place on code injection