Facebook Connect and Codeigniter - HTTP/1.0 400 Bad Request

Question

i'm struggling really hard to implement Facebook connect into my codeigniter application - I have one issue right now. After downloading the PHP SDK from here: https://github.com/facebook/php-sdk/ I copied the /src files into my CI libraries (as everyone do : )).

Now I want to authenticate my users using this method:

https://developers.facebook.com/docs/authentication/server-side/

My controller is here (I think the problem is at the end, but pasted full file, cause i'm not sure):

<?php

class Fb25 extends CI_Controller {

function index()
{
            $app_id     = "MY APP ID";
    $app_secret = "MY SECRET KEY";
    $site_url   = "http://devlocalhost.com/";

$this->load->library('facebook',array('appId' => $app_id, 'secret' => $app_secret));

    $user = $this->facebook->getUser();
    $data['user'] = $user;

if($user){

    $data['user_profile'] = $this->facebook->api('/me');    
    $user_profile = $data['user_profile'];

} else{

    $user = NULL;

}       

if($user){
// Get logout URL
$data['logoutUrl'] = $this->facebook->getLogoutUrl(array(
    'next'  => 'http://devlocalhost.com/', // URL to which to redirect the user after logging out
    ));
}else{
// Get login URL
    $data['loginUrl'] = $this->facebook->getLoginUrl(array(
    'scope'     => 'email', // Permissions to request from the user
    'redirect_uri'  => 'http://devlocalhost.com/fb25/good', // URL to redirect the user to once the login/authorization process is complete.
    ));
}

if($user){


// Save your method calls into an array
$data['queries'] = array(
    array('method' => 'GET', 'relative_url' => '/'.$user),
    array('method' => 'GET', 'relative_url' => '/'.$user.'/home?limit=50'),
    array('method' => 'GET', 'relative_url' => '/'.$user.'/friends'),
    array('method' => 'GET', 'relative_url' => '/'.$user.'/photos?limit=6'),
    );

// POST your queries to the batch endpoint on the graph.
    $batchResponse = $facebook->api('?batch='.json_encode($queries), 'POST');


//Return values are indexed in order of the original array, content is in ['body'] as a JSON
//string. Decode for use as a PHP array.
$data['user_info']      = json_decode($batchResponse[0]['body'], TRUE);
$data['feed']           = json_decode($batchResponse[1]['body'], TRUE);
$data['friends_list']   = json_decode($batchResponse[2]['body'], TRUE);
$data['photos']         = json_decode($batchResponse[3]['body'], TRUE);


    }
    echo 'user_info: '.$data['user_info'];
    print_r($data);

    $this->load->view('fb25_view', $data);
}

public function good(){

$app_id     = "MY APP ID";
    $app_secret = "MY SECRET KEY";
    $site_url   = "http://devlocalhost.com/";


echo '<br/><br/>SESJA:<br/>';
print_r($_SESSION);
echo '<br/><br/>GET:<br/>';
print_r($_GET);
echo '<br/><br/>REQUEST:<br/>';
print_r($_REQUEST);
    echo '<br/><br/>najs<br/><br/>';




   session_start();

  $code = $_GET["code"];

  //@@@@@@IMO PROBLEM IS SOMEWHERE HERE: 


 $token_url = "https://graph.facebook.com/oauth/access_token?"
   . "client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url)
   . "&client_secret=" . $app_secret . "&code=" . $code;


 $response = file_get_contents($token_url);

 $params = null;
 parse_str($response, $params);

 $graph_url = "https://graph.facebook.com/me?access_token=" 
   . $params['access_token'];

 $user = json_decode(file_get_contents($graph_url));
 echo("Hello " . $user->name);



}
}
?>

My problem is: I'm pressing the login button and gets into facebook to authenticate myself, clicking "go to app" and want to go back into my website - it says:

Message: file_get_contents(https://graph.facebook.com/oauth/access_token? client_id=487560264592073&redirect_uri=http%3A%2F%2Fdevlocalhost.com%2F&client_secret=mysecretcode&code=AQAgnmNWwDub9yaRB6Vf73gg8Xvwo8KhIM077lB67_bu1Z3rAvyk3Ckl54qK7hh9o3VkG0rFIBTfRXwtrSBFVWEpqYfm1o7e5CQg3jVctq-EE1ZxWrgWrfesLpQ2oF3wlmEMb5o6ORobGmibT06kqe5f2N0ch4kSYBJ4SiTcdV-612fGOJHGcipeyU_GJJ0Jvsg) 

[function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request 

UPDATE

Look here, please:

I added function into your controller:

public function link(){
$fb_usr = $this->fb_connect->user;
 $firstname = $fb_usr['first_name']; 

$my_url="http://devlocal.pl";
echo 'user_id';


 $token_url = "https://graph.facebook.com/oauth/access_token?"
   . "client_id=myclientid&redirect_uri=" . urlencode($my_url)
   . "&client_secret=mysecretcode&code=" . $_GET['code'];

    redirect($token_url);

}

To get my access token - without access token I can't get my username.. I made your loginbyfacebook function redirecting into link function. And it doesn't show the fb username.

When I'm redirecting to my token_url It shows:

{
"error": {
  "message": "Error validating verification code.",
  "type": "OAuthException",
  "code": 100
   }
}

Answer 1

Follow these steps:

1.Put the facebook php sdk in library folder
2.create facebook config with app detail
3.Inherit facebook class in fb_connect
4.add these function in controller then it will work like charm.

fb_connect.php

<?php
include(APPPATH.'libraries/facebook/facebook.php');

class Fb_connect extends Facebook{

    //declare public variables
    public  $user       = NULL;
    public  $user_id    = FALSE; 
    public $fb          = FALSE;
    public $fbSession   = FALSE;
    public $appkey      = 0;

    //constructor method.
    public function __construct()
    {
               $CI = & get_instance();
                $CI->config->load("facebook",TRUE);
                $config = $CI->config->item('facebook');
                parent::__construct($config);                   
                $this->user_id = $this->getUser(); // New code

                $me = null;
                if ($this->user_id) {
                    try {
                        $me = $this->api('/me');
                        $this->user = $me;
                        } catch (FacebookApiException $e) {
                            error_log($e);
                        }
        }
    } 

} // end class

Controller function

function loginByFacebook(){
        $this->load->library('fb_connect');      
$param = array(
             'scope' =>'email,user_location,user_birthday,offline_access',
                'redirect_uri' => base_url()
            );
        redirect($this->fb_connect->getLoginUrl($param));


}

function facebook() {   

        if (!$this->fb_connect->user_id) {      

        } else {        
            $fb_uid = $this->fb_connect->user_id;
            $fb_usr = $this->fb_connect->user;  
            $firstname = $fb_usr['first_name'];
                    }
         }

In this way

$fb_usr = $this->fb_connect->user;
 $firstname = $fb_usr['first_name'];