使用服务帐户，getAccessToken(）返回null - Using a Service Account, getAccessToken() is returning null

Using a Service Account, getAccessToken() is returning null

本文关键字：返回 null getAccessToken 服务 | 更新日期: 2023-09-27

我正在使用此处的客户端库运行以下PHP代码：https://code.google.com/p/google-api-php-client/.对于这些代码，我没有得到任何错误，但当我调用getAccessToken()时，它返回null。

我已允许在我的个人日历上访问此服务帐户，并已通过API控制台授予对该项目的完全访问权限。

有什么想法吗？

require_once 'google-api-php-client/src/Google_Client.php';
const CLIENT_ID = 'blahblahblah';
const SERVICE_ACCOUNT_NAME = 'blahblahblah@developer.gserviceaccount.com';
const KEY_FILE = 'path/to/privatekey.p12';
$google_client = new Google_Client(); // created only to initialized static dependencies
$client = new Google_OAuth2(); // you really just need Google_OAuth2
$key = file_get_contents(KEY_FILE);  
$client->setAssertionCredentials(
    new Google_AssertionCredentials(
        SERVICE_ACCOUNT_NAME,
        array('https://www.googleapis.com/auth/calendar'),
        $key
    )
);
var_dump($client->getAccessToken());

出于某种原因，这似乎奏效了：

require_once 'google-api-php-client/src/Google_Client.php';
const CLIENT_ID = 'blahblahblah';
const SERVICE_ACCOUNT_NAME = 'blahblahblah@developer.gserviceaccount.com';
const KEY_FILE = 'path/to/privatekey.p12';
const CALENDAR_SCOPE = "https://www.googleapis.com/auth/calendar";
$key = file_get_contents(KEY_FILE);
$auth = new Google_AssertionCredentials(
    SERVICE_ACCOUNT_NAME,
    array(CALENDAR_SCOPE),
    $key
);
$client = new Google_Client();
$client->setScopes(array(CALENDAR_SCOPE));
$client->setAssertionCredentials($auth);
$client->getAuth()->refreshTokenWithAssertion();
$accessToken = $client->getAccessToken();
$client->setClientId(CLIENT_ID);

如果有人能解释为什么这样做，请编辑此答案或评论！