Facebook OAuth retrieve information based on stored session

Hello,

Am new to facebook development and am trying to get this little job done. I've been using PHP-SDK so far to authenticate.

I used the below code to gain access

<?php

require '../src/facebook.php';
Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYPEER] = false;
Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYHOST] = 2;


// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => 'xxx',
  'secret' => 'xxx',
  'cookie' => true,
));





// We may or may not have this data based on a $_GET or $_COOKIE based session.
//
// If we get a session here, it means we found a correctly signed session using
// the Application Secret only Facebook and the Application know. We dont know
// if it is still valid until we make an API call using the session. A session
// can become invalid if it has already expired (should not be getting the
// session back in this case) or if the user logged out of Facebook.
$session = $facebook->getSession();

$me = null;
// Session based API call.
if ($session) {
  try {
    $uid = $facebook->getUser();
    $me = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    error_log($e);
  }
}

// login or logout url will be needed depending on current user state.
if ($me) {
  $logoutUrl = $facebook->getLogoutUrl();
} else {
  //$loginUrl = $facebook->getLoginUrl();
  $loginUrl = $facebook->getLoginUrl(array('ext_perm' => 'offline_access');
}

// This call will always work since we are fetching public data.
$naitik = $facebook->api('/naitik');

?>
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml"&gt;
  <head>
    <title>php-sdk</title>
    <style>
      body {
        font-family: 'Lucida Grande', Verdana, Arial, sans-serif;
      }
      h1 a {
        text-decoration: none;
        color: #3b5998;
      }
      h1 a:hover {
        text-decoration: underline;
      }
    </style>
  </head>
  <body>
    <!--
      We use the JS SDK to provide a richer user experience. For more info,
      look here: http://github.com/facebook/connect-js
    -->
    <div id="fb-root"></div>
    <script>
      window.fbAsyncInit = function() {
        FB.init({
          appId   : '<?php echo $facebook->getAppId(); ?>',
          session : <?php echo json_encode($session); ?>, // don't refetch the session when PHP already has it
          status  : true, // check login status
          cookie  : true, // enable cookies to allow the server to access the session
          xfbml   : true // parse XFBML
        });

        // whenever the user logs in, we refresh the page
        FB.Event.subscribe('auth.login', function() {
          window.location.reload();
        });
      };

      (function() {
        var e = document.createElement('script');
        e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
        e.async = true;
        document.getElementById('fb-root').appendChild(e);
      }());
    </script>


    <h1><a href="example.php">php-sdk</a></h1>

    <?php if ($me): ?>
    <a href="<?php echo $logoutUrl; ?>">
      <img src="http://static.ak.fbcdn.net/rsrc.php/z2Y31/hash/cxrz4k7j.gif"&gt;
    </a>
    <?php else: ?>
    <div>
      Using JavaScript &amp; XFBML: <fb:login-button></fb:login-button>
    </div>
    <div>
      Without using JavaScript &amp; XFBML:
      <a href="<?php echo $loginUrl; ?>">
        <img src="http://static.ak.fbcdn.net/rsrc.php/zB6N8/hash/4li2k73z.gif"&gt;
      </a>
    </div>
    <?php endif ?>

    <h3>Session</h3>
    <?php if ($me): ?>
    <pre><?php print_r($session); ?></pre>

    <h3>You</h3>
    <img src="https://graph.facebook.com/&lt;?php echo $uid; ?>/picture">
    <?php echo $me['name']; ?>

    <h3>Your User Object</h3>
    <pre><?php print_r($me); ?></pre>
    <?php else: ?>
    <strong><em>You are not Connected.</em></strong>
    <?php endif ?>

    <h3>Naitik</h3>
    <img src="https://graph.facebook.com/naitik/picture"&gt;
    <?php echo $naitik['name']; ?>
  </body>
</html>

Am storing a serialized data of the session so I can use it later on to access the wall feed. In the below code, I retrieve the session and use set_session from the API to setup the existing session.

<?php

require '../src/facebook.php';
require 'DBFunctions.php';

Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYPEER] = false;
Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYHOST] = 2;


// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => 'xxx',
  'secret' => 'xxx',
  'cookie' => true,
));




// We may or may not have this data based on a $_GET or $_COOKIE based session.
//
// If we get a session here, it means we found a correctly signed session using
// the Application Secret only Facebook and the Application know. We dont know
// if it is still valid until we make an API call using the session. A session
// can become invalid if it has already expired (should not be getting the
// session back in this case) or if the user logged out of Facebook.
//$session = $facebook->getSession();
$session = $facebook->setSession(unserialize(Retrieve_Session(2)));






$me = null;
// Session based API call.
if ($session) {
  try {
    $uid = $facebook->getUser();
    $me = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    error_log($e);
  }
}

// login or logout url will be needed depending on current user state.
if ($me) {
  $logoutUrl = $facebook->getLogoutUrl();
} else {
  $loginUrl = $facebook->getLoginUrl();
}


print_r(unserialize(Retrieve_Session(2)));
?>
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml"&gt;
  <head>
    <title>php-sdk</title>
    <style>
      body {
        font-family: 'Lucida Grande', Verdana, Arial, sans-serif;
      }
      h1 a {
        text-decoration: none;
        color: #3b5998;
      }
      h1 a:hover {
        text-decoration: underline;
      }
    </style>
  </head>
  <body>
    <h1><a href="example.php">php-sdk</a></h1>

    <?php if ($me): ?>
    <a href="<?php echo $logoutUrl; ?>">
      <img src="http://static.ak.fbcdn.net/rsrc.php/z2Y31/hash/cxrz4k7j.gif"&gt;
    </a>
    <?php else: ?>
    <div>

    </div>
    <div>
      Without using JavaScript &amp; XFBML:
      <a href="<?php echo $loginUrl; ?>">
        <img src="http://static.ak.fbcdn.net/rsrc.php/zB6N8/hash/4li2k73z.gif"&gt;
      </a>
    </div>
    <?php endif ?>

    <h3>Session</h3>
    <?php if ($me): ?>
    <pre><?php print_r($session); ?></pre>

    <h3>You</h3>
    <img src="https://graph.facebook.com/&lt;?php echo $uid; ?>/picture">
    <?php echo $me['name']; ?>

    <h3>Your User Object</h3>
    <pre><?php print_r($me); ?></pre>
    <?php else: ?>
    <strong><em>You are not Connected.</em></strong>
    <?php endif ?>

  </body>
</html>

The above code won't work and will show me the login screen although I've passed the unseralized data of the session. Any idea how I can solve this issue?

P.S I changed the application setting to "Native Application" because I read somewhere it will handle recovering sessions without re-logging.

Please advice?

ansaurus

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answers:

Facebook OAuth retrieve information based on stored session

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