$user = $facebook->getUser(); 

<?php
include_once("./_common.php");
include_once(G5_SNS_PATH."/facebook/src/facebook.php");
$facebook = new Facebook(array(
    'appId'  => $config['cf_facebook_appid'],
    'secret' => $config['cf_facebook_secret']
));
$user = $facebook->getUser();
 
if ($user) {
    try {
        $user_profile = $facebook->api('/me');
    } catch (FacebookApiException $e) {
        error_log($e);
        $user = NULL;
    }
}
$g5['title'] = '페이스북 콜백';
include_once(G5_PATH.'/head.sub.php');
if ($user) {
    $sns_name = $user_profile['name'];
    $sns_user = $user;
    
    set_cookie('ck_sns_name', $sns_name, 86400);
    set_session('ss_facebook_user', $user);
    $g5_sns_url = G5_SNS_URL;
    echo <<<EOT
    <script>
    $(function() {
        document.write("<strong>페이스북 승인이 되었습니다.</strong>");
        var opener = window.opener;
        opener.$("#wr_name").val("{$sns_name}");
        opener.$("#facebook_icon").attr("src", "{$g5_sns_url}/icon/facebook.png");
        opener.$("#facebook_checked").attr("disabled", false);
        opener.$("#facebook_checked").attr("checked", true);
        window.close();
    });
    </script>
EOT;
} else {
    echo <<<EOT
    <script>
    $(function() {
        alert("페이스북 승인이 되지 않았습니다.");
        window.close();
    });
    </script>
EOT;
}
include_once(G5_PATH.'/tail.sub.php');
?>

  /**
   * Get the UID of the connected user, or 0
   * if the Facebook user is not connected.
   *
   * @return string the UID if available.
   */
  public function getUser() {
    if ($this->user !== null) {
      // we've already determined this and cached the value.
      return $this->user;
    }
    return $this->user = $this->getUserFromAvailableData();
  }
 
  /**
   * Determines the connected user by first examining any signed
   * requests, then considering an authorization code, and then
   * falling back to any persistent store storing the user.
   *
   * @return integer The id of the connected Facebook user,
   *                 or 0 if no such user exists.
   */
  protected function getUserFromAvailableData() {
    // if a signed request is supplied, then it solely determines
    // who the user is.
    $signed_request = $this->getSignedRequest();
    if ($signed_request) {
      if (array_key_exists('user_id', $signed_request)) {
        $user = $signed_request['user_id'];
        if($user != $this->getPersistentData('user_id')){
          $this->clearAllPersistentData();
        }
        $this->setPersistentData('user_id', $signed_request['user_id']);
        return $user;
      }
      // if the signed request didn't present a user id, then invalidate
      // all entries in any persistent store.
      $this->clearAllPersistentData();
      return 0;
    }
 
  /**
   * Retrieve the signed request, either from a request parameter or,
   * if not present, from a cookie.
   *
   * @return string the signed request, if available, or null otherwise.
   */
  public function getSignedRequest() {
    if (!$this->signedRequest) {
      if (!empty($_REQUEST['signed_request'])) {
        $this->signedRequest = $this->parseSignedRequest(
          $_REQUEST['signed_request']);
      } else if (!empty($_COOKIE[$this->getSignedRequestCookieName()])) {
        $this->signedRequest = $this->parseSignedRequest(
          $_COOKIE[$this->getSignedRequestCookieName()]);
      }
    }
    return $this->signedRequest;
  }