具有离线访问功能的Google Drive api

Question

我正在使用以下代码将文件上传到Google云端硬盘，通过刷新令牌使用离线访问API：

<?php
include 'config.php';
$client_id      = XXXX;
$client_secret  = XXXX;
$redirect_uri   = XXXX;
$refreshToken   = XXXX; //stored refresh token during the first time authendication

function get_oauth2_token($grantCode) 
{
global $config;

$client_id      = XXXX;
$client_secret  = XXXX;
$redirect_uri   = XXXX;

$oauth2token_url = "https://accounts.google.com/o/oauth2/token";
$clienttoken_post = array(
"client_id" => $client_id,
"client_secret" => $client_secret);

$clienttoken_post["refresh_token"] = $grantCode;
$clienttoken_post["grant_type"] = "refresh_token";

$curl = curl_init($oauth2token_url);

curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $clienttoken_post);
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$json_response = curl_exec($curl);
curl_close($curl);
return $json_response;

}   
require_once 'Google/Client.php';
require_once 'Google/Service/Drive.php';

$drive = new Google_Client();

$drive->setClientId($client_id); // HERE I WRITE MY Client ID
$drive->setClientSecret($client_secret); // HERE I WRITE MY Client Secret


$gdrive = new Google_Service_Drive($drive);
$response = get_oauth2_token($refreshToken);//i am getting the access token in json format here
$drive->setAccessToken($response);

$doc = new Google_Service_Drive_DriveFile();
$doc->setTitle('Test Drive');
$doc->setDescription('Document');
$doc->setMimeType('text/plain');

$content = file_get_contents('files/example.txt');

$output = $gdrive->files->insert($doc, array(
  'data' => $content,
  'mimeType' => 'text/plain',
));

print_r($output);

?>

当我尝试执行上述脚本时，我收到此错误：

  

致命错误：未捕获的异常“Google_Auth_Exception”，并显示消息“OAuth 2.0访问令牌已过期，并且刷新令牌不可用。对于自动批准的回复，不会返回刷新令牌。在D：\ karthi \ xampp-win32-1.8.2-1-VC9 \ xampp \ htdocs \ apis \ google_drive \ Google \ Auth \ OAuth2.php：222堆栈跟踪：＃0 D：\ karthi \ xampp-win32-1.8 .2-1-VC9 \ xampp \ htdocs \ apis \ google_drive \ Google \ Service \ Resource.php（176）：Google_Auth_OAuth2-＆gt; sign（Object（Google_Http_Request））＃1 D：\ karthi \ xampp-win32-1.8。 2-1-VC9 \ xampp \ htdocs \ apis \ google_drive \ Google \ Service \ Drive.php（1754）：Google_Service_Resource-＆gt; call（'insert'，Array，'Google_Service _...'）＃2 D：\ karthi \ xampp-win32-1.8.2-1-VC9 \ xampp \ htdocs \ apis \ google_drive \ offline.php（65）：Google_Service_Drive_Files_Resource-＆gt; insert（Object（Google_Service_Drive_DriveFile），Array）＃3 {main}抛出D：第222行的\ karthi \ xampp- win32-1.8.2-1-VC9 \ xampp \ htdocs \ apis \ google_drive \ Google \ Auth \ OAuth2.php

我正在使用这个php客户端库GOOGLE PHP CLIENT

请帮帮我。