Google API:refresh_token 缺失(访问类型 = 离线)

Google API: refresh_token missing (access type = offline)

我正在尝试将我的网络应用程序连接到 google 驱动器。所以我使用 PHP 和官方 Github PHP 客户端代码 [https://github.com/google/google-api-php-client/tree/v1-master].

我遵循了 v2 的快速入门 [https://developers.google.com/drive/v2/web/quickstart/php],因为 PHP 客户端仅适用于 v2。

然后我添加了一行请求离线访问。 [参见 https://developers.google.com/identity/protocols/OAuth2WebServer#offline]

我的应用程序代码,使用 Yii 1 开发,但并不重要,是:

    $client = new Google_Client();
    $client->setApplicationName("Google Drive Client");
    $client->addScope(Google_Service_Drive::DRIVE_METADATA_READONLY);
    $client->setRedirectUri( Yii::app()->createAbsoluteUrl("site/googleApiLoginCallback") );    

    $client->setAuthConfigFile(CLIENT_SECRET_PATH);
    $client->setAccessType('offline');

    if (file_exists(CREDENTIALS_PATH)) {
        $accessToken = file_get_contents(CREDENTIALS_PATH);
    } else {
        // Request authorization from the user.
        $auth_url = $client->createAuthUrl();
        header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
        Yii::app()->end();
    }   
    $client->setAccessToken($accessToken);

    // Refresh the token if it's expired.
    if ($client->isAccessTokenExpired()) {
        $refresh_token = $client->getRefreshToken();
        // CVarDumper::dump($refresh_token,2,true);
        $client->refreshToken($refresh_token);
        file_put_contents(CREDENTIALS_PATH, $client->getAccessToken());
    }
    return $client;

这是处理 OAuth 回调的代码。我只是设置收到的访问令牌,然后重定向到页面。

public function actionGoogleApiLoginCallback($code)
{
    $client = new Google_Client();
    $client->setApplicationName("Google Drive Client");
    $client->addScope(Google_Service_Drive::DRIVE_METADATA_READONLY);
    $client->setRedirectUri( Yii::app()->createAbsoluteUrl("site/googleApiLoginCallback") );    

    $client->setAuthConfigFile(CLIENT_SECRET_PATH);
    $client->setAccessType('offline');

    $accessToken = $client->authenticate($code);
    if(!file_exists(dirname(CREDENTIALS_PATH))) {
      mkdir(dirname(CREDENTIALS_PATH), 0700, true);
    }
    file_put_contents(CREDENTIALS_PATH, $accessToken);

    $preGoogleApiLoginRoute = Yii::app()->user->getState("preGoogleApiLoginRoute", null);
    if ($preGoogleApiLoginRoute) 
    {
        $this->redirect(array( $preGoogleApiLoginRoute ));
    } else  {
        $this->redirect(array("site/index"));
    }
}

当用户第一次访问该页面时,我的 webapp 成功重定向到 Google 登录;用户登录,然后 Google 将用户重定向到我位于 site/googleApiLoginCallback 的网站。我将收到的代码设置为 accessToken 并将用户重定向到他来自的 webapp 页面。

有效。

但是:过了一会儿,当用户返回页面时,tyhe 令牌已过期。当它执行 $client->getRefreshToken() 时,它 returns 一个 null,所以 $client->refreshToken() 由于缺少刷新令牌

抛出以下错误

Error refreshing the OAuth2 token, message: '{ "error" : "invalid_request", "error_description" : "Missing required parameter: refresh_token" }'

我错过了什么或做错了什么?

供参考:这是我的 json 访问令牌。如您所见,我没有像我期望的那样命名为 'refreshToken' 的字段

{"access_token":"...hiddden...","token_type":"Bearer","expires_in":3600,"created":1453759023}

我使用的逻辑有点不同,但它有效...:-)
而不是:

...
$accessToken = file_get_contents(CREDENTIALS_PATH);
...
$client->setAccessToken($accessToken);
if ($client->isAccessTokenExpired()) {
    $refresh_token = $client->getRefreshToken();
    $client->refreshToken($refresh_token);
    file_put_contents(CREDENTIALS_PATH, $client->getAccessToken());
}
...

我愿意:

...
$accessToken = file_get_contents(CREDENTIALS_PATH);
...
$client->setAccessToken($accessToken);
if (!$client->getAccessToken()) {
    die('invalid access token in ' . CREDENTIALS_PATH);
}
if ($client->isAccessTokenExpired()) {
    $refresh_token = json_decode($accessToken)->refresh_token;
    $client->refreshToken($refresh_token);
}
... now we are authenticated ...

来自this Whosebug question 我看到那个说法

in order to obtain a new refresh_token after already receiving one, you will need to send your user back through the prompt, which you can do by setting approval_prompt to force.

Google指向了to this old blog post

所以我添加了

$client->setApprovalPrompt('force');

之后
$client->setAccessType('offline');

现在我有了刷新令牌。