Facebook API-在会话中保存OAuth访问令牌

Question

我正在尝试找到一种方法，以使用OAuth授权后保持与Facebook API的连接，但遇到了问题。 我不希望我的应用程序的用户每次想使用我的应用程序时都必须通过Facebook登录。

在用户通过facebook进行身份验证之后，我将oauth访问权限存储在数据库中，并且设置了"offline_access"权限，因此从理论上讲，这应该是可能的。

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

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

当Facebook通过您的应用程序访问令牌时，它会传递一个expires字段，根据Facebook的默认值为2小时。

还有其他因素会使access_token过期，这是您的完整详细信息

Ankur Pansari操作方法：处理过期的访问令牌

接下来，我们可以讨论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.

因此，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，请参见参考链接。

Facebook的权限