有几个想修改的地方要提交个PR，不知道作者会不会合并了

[godtail]

第一处

Storage::extend('oss', function($app, $config)
        {
            $accessId  = $config['access_id'];
            $accessKey = $config['access_key'];

            $cdnDomain = empty($config['cdnDomain']) ? '' : $config['cdnDomain'];
            $bucket    = $config['bucket'];
            $ssl       = empty($config['ssl']) ? false : $config['ssl'];
            $isCname   = empty($config['isCName']) ? false : $config['isCName'];
            $debug     = empty($config['debug']) ? false : $config['debug'];
            $endPoint  = $config['endpoint']; // 默认作为外部节点
            // TODO: 这里和文档描述不一致
            $epInternal= $isCname?$cdnDomain:(empty($config['endpoint_internal']) ? $endPoint : $config['endpoint_internal']); // 内部节点

            if($debug) Log::debug('OSS config:', $config);

            $client  = new OssClient($accessId, $accessKey, $epInternal, $isCname);
            $adapter = new AliOssAdapter($client, $bucket, $endPoint, $ssl, $isCname, $debug, $cdnDomain);

            //Log::debug($client);
            $filesystem =  new Filesystem($adapter);

            $filesystem->addPlugin(new PutFile());
            $filesystem->addPlugin(new PutRemoteFile());
            //$filesystem->addPlugin(new CallBack());
            return $filesystem;
        });

第二处

public function getUrl( $path )
    {
       // TODO: 这里判断文件是否存在，批量获取的时候回比较影响性能，考虑是否要加个配置项
        if (!$this->has($path)) throw new FileNotFoundException($filePath.' not found');
        return ( $this->ssl ? 'https://' : 'http://' ) . ( $this->isCname ? ( $this->cdnDomain == '' ? $this->endPoint : $this->cdnDomain ) : $this->bucket . '.' . $this->endPoint ) . '/' . ltrim($path, '/');
    }