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我正在尝试将用户登录到 Google 日历，而无需用户输入其姓名和密码。我已经成功设置了 OATH，并且可以通过 PHP 脚本操作他们的日历。但我需要做的是运行一个脚本，然后以某种方式创建一个链接供用户单击以获取访问权限。

请参阅下面示例 php copde 中的第 1 步到第 5 步。这基本上是日历示例中的 simple.php 代码。

我可能会误解工作流程，但就是这样。1) 创建身份验证 URL 2) 获取代码并使用令牌回叫自己 3) 设置令牌 4) 使用此令牌访问日历 5) 使用令牌授予对日历的访问权限 - 这是执行的部分不行

/示例 PHP 代码** * ** * **** /

require_once '../phplibs/gApi/Google_Client.php';
require_once '../phplibs/gApi/contrib/Google_CalendarService.php';
session_start();

$client = new Google_Client();
$client->setApplicationName("Google Calendar PHP Starter Application");

 $client->setClientId('xxxxxxxxxxxxxxxxxxxxxx');
 $client->setClientSecret('xxxxxxxxxxxxxxxxxxxxxxx');
 $client->setRedirectUri(xxxxxxxxxxxxxxxxxxxxxxxxxx'); // The redirect is this same script
 $client->setDeveloperKey('xxxxxxxxxxxxxxxxx');
$cal = new Google_CalendarService($client);

if (isset($_GET['logout'])) {
  unset($_SESSION['token']);
}

if (isset($_GET['code'])) {
  //Step 2
  //I have been called back with the code
  // so use this to create a token
  $client->authenticate($_GET['code']);
  $_SESSION['token'] = $client->getAccessToken();
  header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF']);
}

if (isset($_SESSION['token'])) {
  // Step 3
  // I have been called back by the redirect in step 2
  // but now with an access token
  $client->setAccessToken($_SESSION['token']);
}

if ($client->getAccessToken()) {

  //Step 4
  // My token exists so now I can work on the users calanders
  // I dont want to do this but it does work so proves the auth worked ok
    $calList = $cal->calendarList->listCalendarList();
   //print "<h1>Calendar List</h1><pre>" . print_r($calList, true) . "</pre>";

   //Not sure why this happens again as we have a token
    $_SESSION['token'] = $client->getAccessToken();

   // Step 5
   // This is really want I want to do, I want to open the users calendar in a iframe or full page
   // However if the user is not logged in they get redirected to the Google login page
   // I was expecting that as the token was set this should work.


   header('Location: https://www.google.com/calendar/render');
  // echo(' <iframe src="https://www.google.com/calendar/embed?src=calendar%40wokingham-theatre.org.uk&ctz=Europe/London" style="border: 0" width="800" height="600" frameborder="0" scrolling="no"></iframe>');



} else {
  //Step 1  
  $authUrl = $client->createAuthUrl();
  print "<a class='login' href='$authUrl'> Connect to the Google calendar without me having to enter my name and password </a>";
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