粉丝页面上的Facebook应用程序选项卡

Question

我想在粉丝页面上创建一个选项卡应用程序。一年前，使用facebook.php v.2.0，我能够创建和管理一个应用程序，但现在情况发生了变化，我无法弄清楚如何连接到API来验证粉丝页面是否被喜欢。我用facebook.php v 3.1.1，所以一年前，我会用：

<?php 
    require 'facebook.php'; 
    $app_id = "YOUR APP ID HERE"; 
    $app_secret = "YOUR SECRET KEY HERE"; 

    $facebook = new Facebook(array(
     'appId' => $app_id, 
     'secret' => $app_secret, 
     'cookie' => true 
    )); 

    $signed_request = $facebook->getSignedRequest(); 
    $like_status = $signed_request["page"]["liked"]; 
?> 

我应该怎么办呢？

Answer 1

你并不需要使用getSignedRequest，这样的事情应该工作：

$signed_request = $_REQUEST["signed_request"]; 
list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true); 

if (empty($data["page"]["liked"])) { 
    //User is not a fan 
} else { 
    //User is a fan 
} 

Answer 2

只是这样做：

<?php 
    $secret = ''; // Input the application secret 

    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') { 
      echo 'Unknown algorithm. Expected HMAC-SHA256'; 
      return null; 
     } 

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

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

    $data = parse_signed_request($_REQUEST['signed_request'], $secret); 
    print_r($data); 
    exit(); 
?>