s3Thumbs.php

<?php
use Bolt\Thumbs\ThumbnailResponder;

class S3ThumbnailResponder extends ThumbnailResponder
{
    
    
    /**
     * Gets raw image data for the thumbnail.
     *
     * @return $data
     **/
    public function createResponse()
    {

        // Test here to decide whether to serve an S3 thumbnail or fall back to standard one
        if(.......) {
          $imageContent = "";
          // Get the image content for the thumbnail from S3 and write it ti $imageContent
        } else {
          // This will fallback to the standard local file response
          $imageContent = parent::createResponse();
        }

        return $imageContent;
    }
    
}



// Then in bootstrap code:

..........
$app->initialize();

$app['thumbnails'] = $app->share(
    function ($app) {
        $responder = new S3ThumbnailResponder($app, $app['request']);
        return $responder;
    }
);