Question

I am trying to get the Facebook access tokens useing the bellow code:
I did create my own function before but it came back with the same error and i can’t work out what is the problem.

function getAccessToken(){
        $app_id = FB_APP_ID;
        $app_secret = FB_SECRET_ID;
        $my_url = FB_PAGE_URL;
        $code = $_REQUEST["code"];   


        if(empty($code)) {
       $_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection
       $dialog_url = "https://www.facebook.com/dialog/oauth?client_id=" 
         . $app_id . "&redirect_uri=" . urlencode($my_url) . "&state="
         . $_SESSION['state'];

       echo("<script> top.location.href='" . $dialog_url . "'</script>");
     }      
    if($_REQUEST['state'] == $_SESSION['state']) {
       $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);
     }
     else {
       echo("The state does not match. You may be a victim of CSRF.");
     }
}

Taken from Server-Side Authentication but i keep getting this error:

    Warning: file_get_contents(https://graph.facebook.com/oauth/access_token?
client_id=ID HERE&redirect_uri=URLHERE&cli
ent_secret=SECRECT&code=AQCI5rNgw9zCPHWGozeT59asg7_022u5tVc5XSef49BiX
IaF5_MAMqFwsqOAquUHgjOu_99ONwUV6IC7k-jV6DsWf9ni3jm8t59aHCBp1jrFaDthPbIKLNLQ-
fZgB5MLh1le5BAPKj_l57jhTLTBfOdxRU30mFCMYzMch8MYFpCmJ9GrjSSGwt0OKb_LNqMoRf8) [function.file-
get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request

Anyone know the fix?

Answer 1

I have managed to fix this issue using the PHP SDK,
and after a long battle with the SDK to get it to do what i wanted.

I did also open another question with the same idea but with another problem.
This problem has now been solved.

Check out this question for the answer to this problem: Facebook Access Token Server Side Authentication