ulthon_admin/extend/think/filesystem/driver/S3.php

<?php

namespace think\filesystem\driver;

use Aws\S3\S3Client;
use League\Flysystem\AwsS3V3\AwsS3V3Adapter;
use League\Flysystem\FilesystemAdapter;
use think\filesystem\Driver;

class S3 extends Driver
{
    protected function createAdapter(): FilesystemAdapter
    {
        $options = [
            'version' => 'latest',
            'region' => sysconfig('upload', 's3_region'),
            'credentials' => [
                'key' => sysconfig('upload', 's3_access_key'),
                'secret' => sysconfig('upload', 's3_secret_key'),
            ],
        ];

        $endpoint = sysconfig('upload', 's3_endpoint');
        if (!empty($endpoint)) {
            $options['endpoint'] = $endpoint;
            if (sysconfig('upload', 's3_path_style') === '1') {
                $options['use_path_style_endpoint'] = true;
            }
        }

        $client = new S3Client($options);

        return new AwsS3V3Adapter($client, sysconfig('upload', 's3_bucket'));
    }

    public function url(string $path): string
    {
        return $this->concatPathToUrl(sysconfig('upload', 's3_domain'), $path);
    }
}