Facebook 连接 : intermittent: Bad Signed JSON signature

Question

我正在使用 Facebook 连接。超过 50% 的注册获得了“Bad Signed JSON 签名”。错误。是什么导致了这个问题，它是如何解决的？

这是代码:

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');
        header('location: /volunteerregistration?error=Facebook has failed to connect. Unknown algorithm. Expected HMAC-SHA256 Please register with Omprakash below. ');
        exit;
    }

    // check sig
    $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
    if ($sig !== $expected_sig) {
        error_log('Bad Signed JSON signature!');
        header('location: /volunteerregistration?error=Facebook has failed to connect. Bad Signed JSON signature. Please register with Omprakash below.');
        exit;
    }

    return $data;
} 

谢谢!

Answer 1

通过检查给定的 app_secret 到 api 解决了同样的问题。我复制了一个隐形标志/字符