使用刷新令牌的Google Calendar API

Question

我在我的网站上有一个php应用程序，它允许我的用户使用我的谷歌日历安排/重新安排日历事件，所以我不需要用户使用Google进行身份验证。我已经通过获取令牌并存储了刷新令牌，但现在，当我尝试访问日历时，出现一条说明我的令牌已过期的错误。输出是

创建客户端 发现访问令牌= { “的access_token”： “长...凭证...串”， “token_type”： “承载”， “expires_in”：3600} 出错：（0）OAuth 2.0访问令牌已过期，并且刷新令牌不可用。刷新令牌不会返回自动批准的响应。

不知道为什么我得到这个错误。

function getAccessToken(){ 
$tokenURL = 'https://accounts.google.com/o/oauth2/token'; 
$postData = array(
    'client_secret'=>'My-Secret', 
    'grant_type'=>'refresh_token', 
    'approval_promt'=> 'force', 
    'refresh_token'=>'My-Refresh-Token', 
    'client_id'=>'My-Client-ID' 
); 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $tokenURL); 
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 

$tokenReturn = curl_exec($ch); 
return $tokenReturn; 
} 

function outputCalendarByDateRange($client, $startDate='2007-05-01', $endDate='2007-08-01'){ 
    date_default_timezone_set("America/Chicago"); 
    $client->addScope('https://www.googleapis.com/auth/calendar'); 
    try { 
    $service = new Google_Service_Calendar($client); 
    }catch(Google_ServiceException $e){ 
    print "Error code :" . $e->getCode() . "\n"; 
    print "Error message: " . $e->getMessage() . "\n"; 
    } catch (Google_Exception $e) { 
    print "An error occurred: (" . $e->getCode() . ") " . $e->getMessage() . "\n"; 
    } 

    $optParams = array(
    'orderBy'=>'starttime', 
    'singleEvents'=>False, 
    'timeMax'=>$endDate, 
    'timeMin'=>$startDate, 
    'timeZone'=>'America/Chicago', 
    'maxResults'=>1000 
); 

    try{ 
    $events = $service->events->listEvents('primary',$optParams); 
    } catch (Google_ServiceException $e) { 
    print "Error code :" . $e->getCode() . "\n"; 
    print "Error message: " . $e->getMessage() . "\n"; 
    } catch (Google_Exception $e) { 
    print "An error occurred: (" . $e->getCode() . ") " . $e->getMessage() . "\n"; 
    } 

    foreach ($events->getItems() as $event) { 
    echo $event->getSummary(); 
    } 
} 

echo "creating a client<br>"; 
$client = new Google_Client(); 
$accessToken = getAccessToken(); 
echo "found access token = ".$accessToken."<br>"; 
try{ 
    $client->setAccessToken($accessToken); 
} 
catch (Google_ServiceException $e) { 
    print "Error code :" . $e->getCode() . "\n"; 
    print "Error message: " . $e->getMessage() . "\n"; 
    } catch (Google_Exception $e) { 
    print "An error occurred: (" . $e->getCode() . ") " . $e->getMessage() . "\n"; 
} 
outputCalendarByDateRange($client, $today, $tomorrow); 

Answer 1

您应该考虑使用服务帐户进行此操作。 A service account将允许您的应用访问您的Google日历数据，而不会提示用户进行访问。

当您创建服务帐户时，请使用它提供给您的电子邮件地址，并将其添加到您的Google日历中。该脚本将可以访问它。

<?php 
session_start();   
require_once 'Google/Client.php'; 
require_once 'Google/Service/Calendar.php';  
/************************************************ 
The following 3 values an befound in the setting 
for the application you created on Google  
Developers console.   Developers console. 
The Key file should be placed in a location  
that is not accessable from the web. outside of 
web root. 

In order to access your GA account you must  
Add the Email address as a user at the  
ACCOUNT Level in the GA admin.   
************************************************/ 
$client_id = '1046123799103-nk421gjc2v8mlr2qnmmqaak04ntb1dbp.apps.googleusercontent.com'; 
$Email_address = '1046123799103-nk421gjc2v8mlr2qnmmqaak04ntb1dbp@developer.gserviceaccount.com';  
$key_file_location = '629751513db09cd21a941399389f33e5abd633c9-privatekey.p12';  
$client = new Google_Client();  
$client->setApplicationName("Client_Library_Examples"); 
$key = file_get_contents($key_file_location);  
// seproate additional scopes with a comma 
$scopes ="https://www.googleapis.com/auth/calendar.readonly"; 
$cred = new Google_Auth_AssertionCredentials( 
    $Email_address,  
    array($scopes),  
    $key   
    );  
$client->setAssertionCredentials($cred); 
if($client->getAuth()->isAccessTokenExpired()) {   
    $client->getAuth()->refreshTokenWithAssertion($cred);  
}  
$service = new Google_Service_Calendar($client);  

?> 

<html><body> 

<?php 
$calendarList = $service->calendarList->listCalendarList(); 
print_r($calendarList); 
while(true) { 
    foreach ($calendarList->getItems() as $calendarListEntry) { 
     echo "<a href='Oauth2.php?type=event&id=".$calendarListEntry->id." '>".$calendarListEntry->getSummary()."</a><br>\n"; 
    } 
    $pageToken = $calendarList->getNextPageToken(); 
    if ($pageToken) { 
     $optParams = array('pageToken' => $pageToken); 
     $calendarList = $service->calendarList->listCalendarList($optParams); 
    } else { 
     break; 
    } 
}  

?> 
</html> 

代码来自教程Google Calendar API with PHP – Service Account