Question

I am implementing facebook registration in my Yii site.. I setup application. For registration, in one step, we need to decode facebook users data, send by facebook. Facebook provide the code for decoding information. I implement this code, but having error like:

” Fatal error: Call to undefined function base64_url_decode() in C:\wamp\www\cma\app\protected\controllers\SiteController.php on line 259 “

My code snippet is

public function actionFacebookLogin()
    {
        //error_reporting(E_ALL);
        //ini_set("display_errors", 1);

        $signed_request = $_POST['signed_request'];
        Yii::log("actionFacebookLogin called.....");
        //list($encoded_sig,$payload) = explode('.', $signed_request,2);

        list ($encoded_sig,$payload) = explode('.', $signed_request,2);

        Yii::log('in the list');
        //decode the data
        $sig =  base64_url_decode($encoded_sig);
        $data = json_decode(base64_url_decode($payload), true);

        if(strtoupper($data['algorithm'])!= 'HMAC-SHA256'){
            Yii::log('Unkonwon alogorithm.Expected HMAC-SHA256');
            //return null;
        }


        //check sig
        $expected_sig = hash_hmac('sha256', $payload, $secret,$raw=true);
        if($sig !== $expected_sig){
            Yii::log('Bad Signed JSON Signature');
            //return null;
        }
        //return $data;
        $this->render('facebookview',array('response'=>$data));

    }

      public function base64_url_decode($input)
        {
        return base64_decode(strtr($input, '-_', '+/'));
        }

I implement this code in my siteController…

Can anyone help to find what is wrong with the code..
Thanks in advance!

Answer 1

Thanks for your help!!! But the problem solved…

I placed, function base64_url_decode into model creating new util class and named as static function base64_url_decode. I called the function as util::base64_url_decode.