php - 如何在使用 FB 登录名登录/注册用户时需要电子邮件权限？

Question

我似乎无法获得所需的电子邮件权限。

如果用户在 FB 登录时取消勾选电子邮件，我的代码就会崩溃。当我尝试围绕这个问题编写代码时(尝试提醒用户接受必要的电子邮件权限。)，它不会工作；用户必须在他们的 FB 设置中手动撤销应用程序的访问权限，这显然是不可能的。

那么我怎样才能将所需的电子邮件权限作为我的应用程序/网站的一部分？

老实说，我无法在不挠头的情况下阅读整个 Facebook API 文档。

这是我目前拥有的:

    var $user = null;
    function __construct()
    {
           //blahblahlblah
           //blahblahblah (Code needed for facebook login to work)

           $this->user = $this->facebook->getUser();
           if ($this->user)
           {
              try
              {
                 // Proceed knowing you have a logged in user
                 $this->user = $this->facebook->api('/me');
                 $this->logoutUrl = $this->facebook->getLogoutUrl( array('next' => base_url() . 'connect/logout') );
              }
              catch (FacebookApiException $e)
              {
                 error_log($e);
                 $this->user = null;
              }
           }
    }
    function process()
    {
        // If the Facebook user allows his/her email to be shared.
        // [If they don't, skip to the `else` statement below]
        if (isset($this->user['email']))
        {
            //Great! I can process normally
        }
        // If the Facebook user doesn't share their email.
        else
        {
            //What do I do here?
            //I'm not sure how the OAuth works, so that's why im checking
            echo 'email is required. line 86 , connect.php controller';
        }
    }

Answer 1

在继续您的应用程序逻辑之前，您应该检查收到的访问 token 。此处描述了如何执行此操作:

https://developers.facebook.com/docs/facebook-login/permissions/v2.0#checking

如果您随后发现用户没有授予 email 权限，您可以按照此处所述将他重新发送到权限对话框:

https://developers.facebook.com/docs/facebook-login/permissions/v2.0#handling

引用:

If someone has declined a permission for your app, the login dialog won't let your app re-request the permission unless you pass auth_type=rerequest along with your request.