配置我的php.ini以运行Facebook php sdk

Question

I am having problems with using the Facebooks php sdk. When printing the

$facebook->getSignedRequest() the print doesn't show any 'page' or 'user' values.

I also tryed to print the $_REQUEST['signed_request'] and all I get is

Notice: Undefined index: signed_request

Could it be some settings in my php.ini file that I've missed to do?

Thanks for the help!

Answer 1

This is only going to possibly solve half the issue, but remember $_REQUEST['signed_request'] not $_REQUEST('signed_request');

EDIT: Ignore the last part as you mentioned, here is your answer:

You are getting variables just not the ones you want. It is returning a signed request, and you need to decrypt the request using your private key. Heres how:

function parse_signed_request($signed_request, $secret) {
  list($encoded_sig, $payload) = explode('.', $signed_request, 2); 

  // decode the data
  $sig = base64_url_decode($encoded_sig);
  $data = json_decode(base64_url_decode($payload), true);

  if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
    error_log('Unknown algorithm. Expected HMAC-SHA256');
    return null;
  }

  // check sig
  $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
  if ($sig !== $expected_sig) {
    error_log('Bad Signed JSON signature!');
    return null;
  }

  return $data;
}

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

Pass the signed request and your app secret into that and it will return your array. Im sure there is a way to do it with the Facebook SDK but im not not sure as I don't use it.

More Info: https://developers.facebook.com/docs/authentication/signed_request/

Goodluck!