如何使用Google API PHP客户端获取OAuth2访问令牌? [英] How to get OAuth2 access token with Google API PHP client?

问题描述

我正在尝试获取OAuth访问令牌，以将一些数据导入融合表.我正在尝试使用Google API PHP客户端.我已经为此目的创建了一个服务帐户，并且正在使用代码，大部分是通过

I'm trying to get an OAuth access token to import some data into the fusion table. I'm trying to use the Google API PHP client. I have created a service account for that purpose, and am using the code, mostly from the serviceAccount example:

function access_token()
{
    $client = new Google_Client();
    $client->setAuthClass ('Google_OAuth2');
    // ^ Don't know if this line is required,
    // ^ but it fails just as well without it.
    $client->setApplicationName ('Mysite.dom.ain');
    $client->setAssertionCredentials (new Google_AssertionCredentials
        (   '[e-mail]',
            array ('https://www.googleapis.com/auth/fusiontables'),
            file_get_contents ('path/to/my/privatekey.p12') ));
    $client->setClientId ('NUMBERS-LETTERS-DASHES.apps.googleusercontent.com');
    $client->authenticate();
    // ^ Also fails equally good with and without this line.
    return $client->getAccessToken();
}

少量调试输出显示$client->authenticate()返回true，但是$client->getAcessToken()返回null.没有异常被抛出.我感觉自己在做一些根本错误的事情.如果是这样，请原谅我的愚蠢并将我指向正确的方向.

A little debug output shows that $client->authenticate() returns true, but $client->getAcessToken() returns null. No exceptions are thrown. I have the feeling I'm doing something fundamentally wrong. If so, please forgive my stupidity and point me in the right direction.

推荐答案

您不需要authenticate()调用，但是您需要调用refreshTokenWithAssertion()来刷新基础访问令牌.如果您正在使用客户端库发出已签名的请求，则如果基础访问令牌已过期，它将懒惰地为您进行此调用.

You don't need the authenticate() call, but you'll need to call refreshTokenWithAssertion() to refresh the underlying access token. If you are using the client library to make signed requests, it will lazily make this call for you if underlying access token has expired.

API请求刷新access_token很昂贵，并且配额很低，因此您需要缓存access_token.

The API requests to refresh the access_token are expensive, and have a low quota, so you'll want to cache the access_token.

// Set your client id, service account name, and the path to your private key.
// For more information about obtaining these keys, visit:
// https://developers.google.com/console/help/#service_accounts
const CLIENT_ID = 'INSERT_YOUR_CLIENT_ID';
const SERVICE_ACCOUNT_NAME = 'INSERT_YOUR_SERVICE_ACCOUNT_NAME';

// Make sure you keep your key.p12 file in a secure location, and isn't
// readable by others.
const KEY_FILE = '/super/secret/path/to/key.p12';

$client = new Google_Client();
$client->setApplicationName("Google FusionTable Sample");

// Set your cached access token. Remember to store the token in a real database instead of $_SESSION.
session_start();
if (isset($_SESSION['token'])) {
 $client->setAccessToken($_SESSION['token']);
}

$key = file_get_contents(KEY_FILE);
$client->setAssertionCredentials(new Google_AssertionCredentials(
    SERVICE_ACCOUNT_NAME,
    array('https://www.googleapis.com/auth/fusiontables'),
    $key)
);

$client->setClientId(CLIENT_ID);

if ($client->getAuth()->isAccessTokenExpired()) {
  $client->getAuth()->refreshTokenWithAssertion();
}

// Get the json encoded access token.
$token = $client->getAccessToken();

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