I am attempting to use the Facebook PHP SDK in conjunction with CodeIgniter to allow users to login to my site using Facebook Connect. No matter what I try, getUser() always returns 0, even after (apparently) successful authentication via Facebook.
CodeIgniter version: 2.1.3
Facebook PHP SDK version: 3.2.2
I have created a config file, facebook.php, in the application/config folder and I am loading the Facebook PHP SDK via CodeIgniter's $this->load->library(...) method. The library is indeed getting loaded and I can successfully call many of the get...() methods including getAccessToken(), getAppId() and getAppSecret(), all of which return their expected values.
Here is a stripped down version of my login controller: (note that I also provide an alternate method of logging in via email, hence the CodeIgniter session code sprinkled throughout)
class Login extends CI_Controller {
public function __construct()
{
//Call parent constructor
parent::__construct();
//Magic sauce - not sure if this is required but a lot of other people
//are recommending it to be included (happy to remove it if necessary)
parse_str($_SERVER['QUERY_STRING'], $_REQUEST);
//Load facebook library
$facebook_config = $this->load->config('facebook');
$this->load->library('facebook', $facebook_config);
}
public function index()
{
//Check if user is logged in
$user_id = $this->session->userdata('user_id');
$is_logged_in = $this->session->userdata('is_logged_in');
if(($is_logged_in) && ($user_id != 0)) {
//Logged in - redirect to game
redirect('game');
} else {
//Not logged in
//Get facebook login url
$facebook_data = array(
'redirect_uri' => 'hxxp://xxxxxxxx.com/facebook_login/',
'scope' => 'email'
);
$data['facebook_login_url'] = $this->facebook->getLoginUrl($facebook_data);
//Redirect to login form
$this->load->view('login/login_form', $data);
}
}
public function facebook_login()
{
//Always returns 0!! Even after authenticating via facebook!
$facebook_user_id = $this->facebook->getUser();
if ($facebook_user_id) {
try {
$user_profile = $this->facebook->api('/me');
print_r($user_profile);
} catch (FacebookApiException $e) {
echo $e->getMessage();
}
} else {
echo "Could not log in with Facebook";
}
}
}
The stripped down view (login_form.php) is as follows:
<html>
<head>
<title>Facebook Connect Test</title>
</head>
<body>
<a href='<? echo $facebook_login_url; ?>'>Login with Facebook</a>
</body>
</html>
I have a route that redirects hxxp://xxxxxxxx.com/facebook_login to the login/facebook_login method, which is working.
I am running this code on a live development server.
My current flow is as follows:
- Load hxxp://xxxxxxxx.com/ (Routes to login controller, which loads login_form view)
- Click "Login with Facebook" link
- Facebook asks me to login (which I do)
- Facebook asks me to give permission to my app (which I do)
- Facebook redirects me to the url specified in the redirect_uri parameter, which is identical to the one on the app settings page
And here's where it all goes wrong. The $this->facebook->getUser() method ALWAYS returns 0, even after authentication.
I have been scouring the Facebook developer documentation and everywhere else on the internet I can think of trying to find an answer to this. I have come across many posts similar to this and have tried to apply the solutions suggested, but to no avail.
What am I doing wrong?
