使用PHP API离线从Google日历事件中检索

Question

我有一个网站，用户希望拥有自己的Google日历。所有示例似乎都要求日历的所有者进行每次身份验证。 有没有办法验证我的应用程序以获取用户日历数据并显示它？

在他们接受我的应用程序后，我尝试保存所有者的access_token ，但是过了一会儿，我收到以下错误：

The OAuth 2.0 access token has expired, and a refresh token is not available. Refresh tokens are not returned for responses that were auto-approved.

这是我正在尝试的代码（顺便说一句，config.php已填写所有api内容）

$client = new Google_Client();
$client->setUseObjects(true); 
$client->setApplicationName("My Unit Calendar");
$client->setAccessType('offline');
$client->setAccessToken($row['access_token'] ); //from the DB

$calService = new Google_CalendarService($client);

$events = $calService->events->listEvents( $row['google_cal_id'] ); //from the DB

echo "events--><pre>".print_r($events,true)."</pre>";

但是我得到以下异常：

Google_AuthException-->The OAuth 2.0 access token has expired, and a refresh token is not available. Refresh tokens are not returned for responses that were auto-approved.

谢谢你的帮助

Answer 1

在从Google获取/设置内容之前，您必须检查访问令牌是否未过期，并使用刷新令牌刷新它，该令牌是在您获得首次授权后得到的（它由$client->getAccessToken() ）。 我想，您想做些事情，像这样：

$client = new Google_Client();
$client->setUseObjects(true); 
$client->setApplicationName("My Unit Calendar");
$client->setAccessType('offline');
$client->setAccessToken($row['access_token'] ); //from the DB

$calService = new Google_CalendarService($client);

checkToken($client, $row['refresh_token']); // Added function

$events = $calService->events->listEvents( $row['google_cal_id'] );

// Check if Access token is expired and get new one using Refresh token
function checkToken($client) {
    if($client->isAccessTokenExpired()) {
        $client->refreshToken( $refresh_token );
    }
}

您必须将首次获得授权时获得的数据库刷新令牌存储在数据库中，并检查访问令牌是否未过期（如果已过期）-刷新（例如，在google_callback.php文件中）：

// Initialize access to Google
$client = new Google_Client();
$client->setClientId( *** );
$client->setClientSecret( *** );
$client->setRedirectUri( *** );
$client->setAccessType( *** );

// Initialize access to Calendar as service
$service = new Google_CalendarService($client);

// If isset code - set into session
if (isset($_GET['code'])) {
    $client->authenticate($_GET['code']);
    $_SESSION['google-api']['access_token'] = $client->getAccessToken();
    header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF']);
}


// If in session is set token
if (isset($_SESSION['google-api']['access_token'])) {
    $client->setAccessToken($_SESSION['google-api']['access_token']);
}


// If Access Token Expired (uses Google_OAuth2 class), refresh access token by refresh token
if($client->isAccessTokenExpired()) {
    $client->refreshToken( /* Get refresh token from DB */);
}


// If client got access token successfuly - perform operations
$access_tokens = json_decode($client->getAccessToken());

if ($access_tokens) {
    // Update refreshToken and save data if refresh token is received (logged in now)
    if(isset($access_tokens->refresh_token)) {
        // Store in DB refresh token - $access_tokens->refresh_token
    }
}