PHP Error PHP SDK

Question

I get an interesting message about the exception of the SDK from the FB PHP SDK. I configured my code exactly as FB docs say ..?

DEBUG ERROR MESSAGE:

[12-Jun-2014 21:08:12 UTC] PHP Fatal error:  Uncaught exception 'Facebook\FacebookSDKException' with message 'Session not active, could not store state.' in C:\WebRoot\Website\root\inc\Facebook\FacebookRedirectLoginHelper.php:188
Stack trace:
#0 C:\WebRoot\Website\root\inc\Facebook\FacebookRedirectLoginHelper.php(94):Facebook\FacebookRedirectLoginHelper->storeState('**********...')
#1 C:\WebRoot\Website\root\login\index.php(87): Facebook\FacebookRedirectLoginHelper->getLoginUrl()
#2 {main}
   thrown in C:\WebRoot\Website\root\inc\Facebook\FacebookRedirectLoginHelper.php on line 188

Facebook.php:

<?php
require_once("../inc/config.php");
require_once(ROOT_PATH . 'inc/Facebook/FacebookSession.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookRedirectLoginHelper.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookRequest.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookResponse.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookSDKException.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookRequestException.php' );
require_once(ROOT_PATH . 'inc/Facebook/FacebookAuthorizationException.php' );
require_once(ROOT_PATH . 'inc/Facebook/GraphObject.php' );
require_once(ROOT_PATH . 'inc/Facebook/HttpClients/FacebookCurl.php' );
require_once(ROOT_PATH . 'inc/Facebook/HttpClients/FacebookHttpable.php' );
require_once(ROOT_PATH . 'inc/Facebook/HttpClients/FacebookCurlHttpClient.php' );

use Facebook\FacebookSession;

// init app with app id (APPID) and secret (SECRET)
FacebookSession::setDefaultApplication("**********","*******************");

Login main page:

<?php
require_once("../inc/config.php");
require_once(ROOT_PATH . 'inc/Facebook/Facebook.php' );
require_once(ROOT_PATH . "inc/LoginHelper.php");

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurlHttpClient;

session_start();

// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper( '***********' );

Link to the main login page:

<a href="<?php echo $helper->getLoginUrl();?>"><img src="<?php echo BASE_URL; ?>img/facebook-login-button.png" class="fb-login"></a>

Redirect page URL:

<?php
require_once("../inc/config.php");
require_once(ROOT_PATH . 'inc/Facebook/Facebook.php' );

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurlHttpClient;

session_start();

//get user login token from FB
$helper = new FacebookRedirectLoginHelper('*******');
try {
   $session = $helper->getSessionFromRedirect();
} catch(FacebookRequestException $ex) {
     echo $ex;
  // When Facebook returns an error
} catch(Exception $ex) {
    echo $ex;
  // When validation fails or other local issues
}
if ($session) {
    $FacebookAccessToken = $session->getToken();
   // Logged in
}

Answer 1

Put session_start();at the top of your file

Answer 2

To expand Chancho's answer, the SDK will check if the session is active before it tries to store any data in it. There are three ways around this.

Launch your own PHP session

PHP-, Chancho . , session_start(); script .

-, ​​ Codeigniter, Yii, CakePHP, Laravel .., . , , \Facebook\FacebookRedirectLoginHelper. storeState() loadState(). SDK, $_SESSION.

GitHub SDK laravel. laravel:

class MyFacebookRedirectLoginHelper extends \Facebook\FacebookRedirectLoginHelper
{
  protected function storeState($state)
  {
    Session::put('state', $state);
  }

  protected function loadState()
  {
    return $this->state = Session::get('state');
  }
}

SDK , , , . FacebookRedirectLoginHelper::disableSessionStatusCheck().

, .

$helper = new FacebookRedirectLoginHelper('*******');

$helper->disableSessionStatusCheck();

$session = $helper->getSessionFromRedirect();

// . . . 

, !

Answer 3

CakePHP v3.1.6 + Facebook SDK v4.1.

SDK,\Facebook\FacebookRedirectLoginHelper , \Facebook\FacebookSessionPersistentDataHandler . $this- > request- > session() → start() AppController , Facebook SDK AuthComponent.

public function initialize() {
    parent::initialize();
    $this->request->session()->start();

    $this->loadComponent('RequestHandler');
    $this->loadComponent('Flash');

    $this->loadComponent('Auth', [
        'authenticate' => [
            'Form' => [
                'fields' => ['username' => 'email', 'password' => 'password']
            ]
        ],
        'loginAction' => ['controller' => 'Users', 'action' => 'login']
    ]);
}