有人通过 Laravel 直接上传到阿里云 OSS 或者华为云的 OBS 上吗？

有，github.com/iiDestiny/laravel-files...

composer require jacobcyl/ali-oss-storage

<?php 
return [
    'disks' => [
        'oss' => [
            'driver'        => 'oss',
            'access_id'     => env('ALIYUN_ACCESS_KEY'),
            'access_key'    => env('ALIYUN_SECRET_KEY'),
            'bucket'        => env('ALIYUN_OSS_OBJECTS_BUCKET'),
            'endpoint'      => env('ALIYUN_OSS_ENDPOINT'),
            'cdnDomain'     => env('ALIYUN_OSS_OBJECTS_HOST'),
            'ssl'           => true,
            'isCName'       => false,
            'debug'         => false,
        ]
    ]
];

use Illuminate\Support\Facades\Storage;

Storage::disk('oss')->put('/foo/bar.json', json_encode([])));

阿里有官方的composer包

自荐一个 https://github.com/telstatic/rakan