OSS 的 driver 如下函数：

/**

     * 保存指定文件

     * @param  array $file 保存的文件信息

     * @param  boolean $replace 同名文件是否覆盖

     * @return boolean          保存状态，true-成功，false-失败

     */

    public function save(&$file, $replace = true)

    {

        $_headers = array('Content-Type: ' . $file['type']);

        $resource = fopen($file['tmp_name'], 'r');

        $path = trim($file['rootPath'], '.') . $file['savepath'] . $file['savename'];

        $uri = "/{$this->config['bucket']}{$path}";

        // $file['url'] = 'http://' .  $this->config['oss_host'].'.aliyuncs.com' . $uri;

        if (stripos($file['type'], 'image') === false) {

            $file['url'] = 'http://' . $this->config['oss_host'] . '.aliyuncs.com' . $uri;

        } else {

            $file['url'] = 'http://' . $this->config['bind_host'] . $path;

        }

        $ch = curl_init('http://' . $this->config['oss_host'] . '.aliyuncs.com' . $uri);

        $date = gmdate('D, d M Y H:i:s \G\M\T');

        array_push($_headers, "Date: {$date}");

        $sign_string = "PUT\n\n" . $file['type'] . "\n" . $date . "\n" . $uri;

        $sign = $this->hex_to_base64(hash_hmac('sha1', $sign_string, $this->config['access_key']));

        array_push($_headers, 'Authorization: OSS ' . $this->config['access_id'] . ':' . $sign);

        fseek($resource, 0, SEEK_END);

        $length = ftell($resource);

        fseek($resource, 0);

        array_push($_headers, "Content-Length: {$length}");

        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");

        curl_setopt($ch, CURLOPT_POST, 1);

        curl_setopt($ch, CURLOPT_INFILE, $resource);

        curl_setopt($ch, CURLOPT_INFILESIZE, $length);

        curl_setopt($ch, CURLOPT_HTTPHEADER, $_headers);

        curl_setopt($ch, CURLOPT_TIMEOUT, $this->config['timeout']);

        curl_setopt($ch, CURLOPT_HEADER, 1);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);

        $response = curl_exec($ch);

        $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        fclose($resource);

        if ($status == 200) {

            return true;

        } else {

            $this->error = $response;

            return false;

        }

    }

红色部分判断是不是图片BUG。在活动模块上传图片是用Flash，文件的type为application/octet-stream，导致误判为非图片，无法正常使用OSS的图片处理功能，所以显示不出来。