Question

我试图找到一种方法，一旦授权使用OAuth与Facebook API保持联系，但我遇到了问题。我不希望我的应用程序的用户每次想要使用我的应用程序时都必须通过Facebook登录。

在用户使用facebook进行身份验证后，我将oauth访问toekn存储在数据库中，并且我设置了"offline_access"权限，因此从理论上讲，这应该是可行的。

但是，当尝试使用存储在数据库中的已保存的Oauth令牌连接到Facebook API时，我得到"Uncaught OAuthException: An active access token must be used to query information about the current user."。

header("p3p: CP=\"ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV\""); // hack to stop facebook wierd cookie problems

//instantiate the Facebook library with the APP ID and APP SECRET
$facebook = new Facebook(array(
    'appId' => 'appid',
    'secret' => 'secretid',
    'cookie' => true
));

//Get the FB UID of the currently logged in user
$user = $facebook->getUser();

//if the user has already allowed the application, you'll be able to get his/her FB UID
if($user) { 
    //get the user's access token
    $access_token = $facebook->getAccessToken();
} else  {
    //see if authorisation already set up in DB
    $query = mysql_query("SELECT oauth_token FROM PingSocialMediaUsers WHERE oauth_provider = 'facebook' AND clientID = '$clientID'");  
    $result = mysql_fetch_row($query); 
    $access_token = $result[0];
}

if($access_token) { 

    //check permissions list
    $permissions_list = $facebook->api(
        '/me/permissions',
        'GET',
        array(
            'access_token' => $access_token
        )
    );

    //check if the permissions we need have been allowed by the user
    //if not then redirect them again to facebook's permissions page
    $permissions_needed = array('publish_stream', 'read_stream', 'offline_access');
    foreach($permissions_needed as $perm) {
        if( !isset($permissions_list['data'][0][$perm]) || $permissions_list['data'][0][$perm] != 1 ) {
            $login_url_params = array(
                'scope' => 'publish_stream,read_stream,offline_access',
                'fbconnect' =>  1,
                'display'   =>  "page",
                'next' => 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']
            );
            $login_url = $facebook->getLoginUrl($login_url_params);
            header("Location: {$login_url}");
            exit();
        }
    }

    //if the user has allowed all the permissions we need,
    //get the information about the pages that he or she managers
    $accounts = $facebook->api(
        '/me',
        'GET',
        array(
            'access_token' => $access_token
        )
    );

    //add to details database
    //find the user by ID  
    if ($user != ''){
        $query = mysql_query("SELECT * FROM PingSocialMediaUsers WHERE oauth_provider = 'facebook' AND oauth_uid = '$user'");  
        $result = mysql_fetch_array($query);  

        // If does not exist add to database  
        if(empty($result)){  
            $query = mysql_query("INSERT INTO PingSocialMediaUsers (oauth_provider, clientID, oauth_uid, username, oauth_token, oauth_secret) VALUES ('facebook', $clientID, $user, '{$accounts['name']}', '$access_token', '')"); 
            $query = mysql_query("SELECT * FROM PingSocialMediaUsers WHERE id = " . mysql_insert_id());  
            $result = mysql_fetch_array($query);  
        } else {  
            //update the tokens  
            $query = mysql_query("UPDATE PingSocialMediaUsers SET oauth_token = '$access_token', oauth_secret = '' WHERE oauth_provider = 'facebook' AND oauth_uid = '$user'");  
        }   


    //save the information inside the session
    $_SESSION['_token'] = $access_token;
    $_SESSION['accounts'] = $accounts['data'];
    }
    $facebookAuth = TRUE;

Answer 1

Facebook在通过您的应用程序时通过expires字段访问令牌，默认情况下，Facebook是2小时。

还有其他因素可以使access_token过期，这里有完整的详细信息

Ankur Pansari How-To: Handle expired access tokens

接下来我们可以谈谈offline_access这意味着

It Enables your app to perform authorized requests 
on behalf of the user at any time. By default, 
most access tokens expire after a short time period to ensure applications 
only make requests on behalf of the user when the are actively 
using the application. This permission makes the 
access token returned by our OAuth endpoint long-lived.

所以这一切都意味着您必须确保始终使用有效的access_token。有关各种权限的详细信息，请参考链接

Facebook Permissions

Facebook API - 在会话中保存OAuth访问令牌

1 个答案: