PHP Error - Facebook PHP SDK5

[dweb]

Hi

 

I'm having some issues working with the facebook sdk5 so im wondering if anyone has had the same issues, i've looked on google and can only see some issues when used with a framework like codeigniter

 

When I run my login.php script it shows the facebook login button and sucessfully redirects me to the callback page, and shows some metadata, but following that comes some errors

Notice: Undefined variable: config in C:\www\fb\fb-callback.php on line 52

Fatal error: Uncaught exception 'Facebook\Exceptions\FacebookSDKException' with message 'Access token metadata contains unexpected app ID.' in C:\www\fb\facebook-php-sdk-v4-5.0.0\src\Facebook\Authentication\AccessTokenMetadata.php on line 329

Facebook\Exceptions\FacebookSDKException: Access token metadata contains unexpected app ID. in C:\www\fb\facebook-php-sdk-v4-5.0.0\src\Facebook\Authentication\AccessTokenMetadata.php on line 329

oddly these errors show despite me taking the code directly from the facebook developers area, and the only things i've added to their code sample is the top 2 lines

session_start();
require_once ('facebook-php-sdk-v4-5.0.0/src/Facebook/autoload.php');

my scripts are

 

login.php

<?php
session_start();
require_once ('facebook-php-sdk-v4-5.0.0/src/Facebook/autoload.php');

$fb = new Facebook\Facebook([
  'app_id' => '',
  'app_secret' => '',
  'default_graph_version' => 'v2.4',
]);

$helper = $fb->getRedirectLoginHelper();

$permissions = ['email']; // Optional permissions
$loginUrl = $helper->getLoginUrl('http://192.168.0.4/fb/fb-callback.php', $permissions);

echo '<a href="' . htmlspecialchars($loginUrl) . '">Log in with Facebook!</a>';
?>

fb-callback.php

<?php
session_start();
require ('facebook-php-sdk-v4-5.0.0/src/Facebook/autoload.php');

$fb = new Facebook\Facebook([  
  'app_id' => '',  
  'app_secret' => '',  
  'default_graph_version' => 'v2.4',  
  ]);  
 
$helper = $fb->getRedirectLoginHelper();  
 
try {  
  $accessToken = $helper->getAccessToken();  
} catch(Facebook\Exceptions\FacebookResponseException $e) {  
  // When Graph returns an error  
  echo 'Graph returned an error: ' . $e->getMessage();  
  exit;  
} catch(Facebook\Exceptions\FacebookSDKException $e) {  
  // When validation fails or other local issues  
  echo 'Facebook SDK returned an error: ' . $e->getMessage();  
  exit;  
}  

if (! isset($accessToken)) {  
  if ($helper->getError()) {  
    header('HTTP/1.0 401 Unauthorized');  
    echo "Error: " . $helper->getError() . "\n";
    echo "Error Code: " . $helper->getErrorCode() . "\n";
    echo "Error Reason: " . $helper->getErrorReason() . "\n";
    echo "Error Description: " . $helper->getErrorDescription() . "\n";
  } else {  
    header('HTTP/1.0 400 Bad Request');  
    echo 'Bad request';  
  }  
  exit;  
}  

// Logged in  
echo '<h3>Access Token</h3>';  
var_dump($accessToken->getValue());  
 
// The OAuth 2.0 client handler helps us manage access tokens  
$oAuth2Client = $fb->getOAuth2Client();  

// Get the access token metadata from /debug_token  
$tokenMetadata = $oAuth2Client->debugToken($accessToken);  
echo '<h3>Metadata</h3>';  
var_dump($tokenMetadata);  
 
// Validation (these will throw FacebookSDKException's when they fail)  
$tokenMetadata->validateAppId($config['app_id']);  
// If you know the user ID this access token belongs to, you can validate it here  
// $tokenMetadata->validateUserId('123');  
$tokenMetadata->validateExpiration();   
   
if (! $accessToken->isLongLived()) {  
  // Exchanges a short-lived access token for a long-lived one  
  try {  
    $accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);  
  } catch (Facebook\Exceptions\FacebookSDKException $e) {  
    echo "<p>Error getting long-lived access token: " . $helper->getMessage() . "</p>";  
    exit;  
  }
  echo '<h3>Long-lived</h3>';  
  var_dump($accessToken->getValue());  
}

$_SESSION['fb_access_token'] = (string) $accessToken;  
 
// User is logged in with a long-lived access token.  
// You can redirect them to a members-only page.  
// header('Location: https://example.com/members.php');
?>

thanks very much