php - Facebook 访问 token - 服务器端身份验证

Question

你好，我正在尝试使用 facebook 服务器端身份验证来获取访问 token ，但不断向我抛出错误。

我正在使用波纹管:

$app_id = "YOUR_APP_ID";
   $app_secret = "YOUR_APP_SECRET";
   $my_url = "YOUR_URL";

   session_start();
   $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.");
   }

App ID 和 APP Secret 已经被移除所以不用担心那部分。我收到有关 get_file_contents 超时的错误消息。

[function.file-get-contents]: failed to open stream: Connection timed out

是否有其他或更好的方法来获取访问 token ？

Bellow 是我尝试过的版本，包括 cURL 想法:

function get_data_cURL($url)
{
  $ch = curl_init();
  $timeout = 5;
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
  $data = curl_exec($ch);
  curl_close($ch);
  return $data;
}

function getAccessToken(){
    $app_id = FB_APP_ID;
    $app_secret = FB_SECRET_ID;
    $canvas_URL = FB_CANVAS_URL;

    session_start();
    $code = $_REQUEST["code"];

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

     $returned_content = get_data_cURL($token_url);
    echo'Well Done! - '.$returned_content;

    }
    else {
      echo("The state does not match. You may be a victim of CSRF.");
    }
}

详细信息:

应用程序设置 - Canvas URL:http://www.apps.elistone.co.uk/DrawMyFriend/

FB_APP_ID = The Facebook App ID
FB_SECRET_ID = The Facebook Secret ID
FB_CANVAS_URL = http://www.apps.elistone.co.uk/DrawMyFriend/

即使有了这个更新，我仍然会收到这个错误:

旧错误

Well Done! - {"error":{"message":"Error validating verification code.","type":"OAuthException","code":100}}

新错误

这似乎是由重定向删除状态代码引起的。

The state does not match. You may be a victim of CSRF. - 193c791ddd71c3fd84d411db5554c315 (state code)

我还尝试通过更改绕过 CSRF 保护:

if($_REQUEST['state'] == $_SESSION['state'])

收件人:

 if(!empty($code))

但这仍然是旧错误问题，我听说这是由重定向链接中的某些内容引起的，但我不确定如何修复它。

问题已解决

经过一段时间的尝试，我已经使用 PHP SDK 使用以下方法获取用户访问 token :

$app_id = FB_APP_ID;
$app_secret = FB_SECRET_ID;
$canvas_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=" . $canvas_URL . "&state="
    . $_SESSION['state'];

  echo("<script> top.location.href='" . $dialog_url . "'</script>");
}
if($_REQUEST['state'] == $_SESSION['state']) {
$facebook->api('oauth/access_token', array(
    'client_id'     => FB_APP_ID,
    'client_secret' => FB_SECRET_ID,
    'type'          => 'client_cred',
    'code'          => $code,
));
$token = $facebook->getAccessToken();
echo$token;
}

我现在要把它变成某种功能。非常感谢大家的时间和帮助。

希望这对将来有需要的人有帮助(除非 Facebook 突然改变一切)

Answer 1

我推荐你使用PHP SDK library用于与 Facebook API 通信。只需使用 getAccessToken() 或 getAccessTokenFromCode() 方法即可。

更新

要检索用户访问 token ，您必须在获取访问 token 之前发送 oauth 请求。答案更新中的详细信息:

    $facebook->api('oauth/access_token', array(
        'client_id'     => APP_ID,
        'client_secret' => APP_SECRET,
        'type'          => 'client_cred',
        'code'          => $code,
    ));
    $token = $facebook->getAccessToken();