将Facebook php sdk整合到Facebook Canvas应用程序中，提供空白页面或oauthData错误 [英] Integrating facebook php sdk in Facebook Canvas App giving Blank page or oauthData error

问题描述

我正在为我的画布应用程序整合Facebook。当我从Facebook上运行以下代码的应用程序

I am trying to integrate facebook for my canvas app. When i run app from facebook with following code

// init app with app id (APPID) and secret (SECRET)
FacebookSession::setDefaultApplication('xx','xx');

$helper = new FacebookCanvasLoginHelper();

try {
    $data = array('oauth_token' => 'token');
    $data['algorithm'] = 'HMAC-SHA256';
    $data['issued_at'] = time();
    $base64data = base64_encode(json_encode($data));
    $rawSig = hash_hmac('sha256', $base64data, 'app_Secret', true);
    $sig = base64_encode($rawSig);

    $signedRequest =  $sig.'.'.$base64data;
    $_GET['signed_request'] = $signedRequest;
    $session = $helper->getSession();


} catch(FacebookRequestException $ex) {
   echo $ex;   
} catch(\Exception $ex) {
   echo $ex;  
}

整个页面只是变为空白，因为 $ _GET ['signed_request'] = $ signedRequest;。

The entire page just turns blank white because of $_GET['signed_request'] = $signedRequest;.

我该怎么做才能登录。如果我只是执行 $ session = $ helper-> getSession（）; 而不是Get我得到无效的签名参数oAuth数据丢失。

What should I do to get login. If i just do $session = $helper->getSession(); instead of Get i get invalid signed paramters oAuth data missing.

推荐答案

您的PHP应该是：

$helper = new FacebookCanvasLoginHelper();

try {
    $session = $helper->getSession();
    if($session){
        try {
        $facebook_profile = (new FacebookRequest(
            $session, 'GET', '/me'
        ))->execute()->getGraphObject(GraphUser::className());
        echo $facebook_profile->getName;
    } catch(FacebookRequestException $e) {
    }
}


} catch(FacebookRequestException $ex) {
   echo $ex;   
} catch(\Exception $ex) {
   $facebookLoginHtml = "window.top.location = 'https://www.facebook.com/dialog/oauth?client_id={your_app_id}&redirect_uri={your_app_canvas_url}';"; 
}

然后你的HTML中的某个地方：

And then somewhere in your HTML:

<script>
    <?php if(isset($facebookLoginHtml)){ echo $facebookLoginHtml; } ?>
</script>

如果要要求额外权限，请在URL中添加范围参数，如下所示：

If you want to ask for extra permission, add the scope parameter in the URL like this:

$facebookLoginHtml = "window.top.location = 'https://www.facebook.com/dialog/oauth?client_id={your_app_id}&redirect_uri={your_app_canvas_url}&scope=publish_actions';"; 

这将重定向页面到登录页面，然后回到你的画布应用程序与适当的许可。

That will redirect the page to the login page, and then come back to your canvas app with the proper permission.

这不应该像这样使用Javascript与PHP SDK。这是一个正在由Facebook解决的错误，您可以在此处查看：

This shouldn't work like this as it's using Javascript with the PHP SDK. It's a bug that is being addressed by Facebook which you can follow here:

https://developers.facebook.com/bugs/722275367815777

如果该错误得到解决，我将编辑答案。

I'll edit the answer if that bug ever gets resolved.

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