/**
* 初始化，将文件信息发送给服务器
* @param File $file
* @param array $data : 附加参数 必须包含路径选项 'path' => '/yourpath/file.ext'
*
* @return mixed
*/
public function initUpload($file, $data)
{
$this->expiration = time() + 186400;
$metaData = array('expiration' => $this->expiration, 'file_blocks' => $this->blocks, 'file_hash' => $file->getMd5FileHash(), 'file_size' => $file->getSize());
$metaData = array_merge($metaData, $data);
$policy = $this->signature->createPolicy($metaData);
$signature = $this->signature->createSign($metaData);
$postData = compact('policy', 'signature');
$result = $this->postData($postData);
$this->saveToken = $result['save_token'];
$this->signature->setTokenSecret($result['token_secret']);
return $result;
}
