如何读取facebook签署__来获取user_id [英] how to read facebook signed_request to get user_id

问题描述

根据 Facebook - 画布页面文档中的身份验证，他们说我们将获得一个包含JSON对象的 signed_request 。现在他们说 signed_request 可以通过 $ _ POST ['signed_request'] 我同意为我工作。

According to Facebook - Authentication within a Canvas Page Document, they say that we will be getting a signed_request which consists a JSON object. Now they say that signed_request can be get through $_POST['signed_request'] I agree its working for me.

现在根据他们，如果用户登录，我将获得一个JSON对象值，如下所示： -

Now according to them if the user is logged in i will be getting a JSON object value like this:-

{
  "expires":UNIXTIME_WHEN_ACCESS_TOKEN_EXPIRES,
  "algorithm":"HMAC-SHA256",
  "issued_at":UNIXTIME_WHEN_REQUEST_WAS_ISSUED,
  "oauth_token":"USER_ACCESS_TOKEN",
  "user_id":"USER_ID",
  "user":{
    "country":"ISO_COUNTRY_CODE",
    "locale":"ISO_LOCALE_CODE",
    ...
  }
}

现在我想获取 user_id ，所以我使用这段代码，但它不工作： -

Now i want to fetch the user_id out of this so i am using this piece of code but its not working:-

if(isset($_POST['signed_request']))
{
    echo 'YES';
    $json = $_POST['signed_request'];
    $obj = json_decode($json);
    print $obj->{'user_id'};    
}

只需打印 YES 。为什么是这样？

It just print the YES. Why is it so?

我已经读过某处没有应用程序认证，我将无法提取 user_id 但是根据Facebook的说法，这是第一步，认证申请将是第四。我是新来的，如果有人可以帮助我，这将是很大的帮助。谢谢。

I have read somewhere that without app authentication i will not be able to extract the user_id but according to the facebook, this is the 1st step and authenticating the application would be 4th. I am new to it, if somebody can please help me, it will be of great help. Thanks.

推荐答案

我认为在 json_decode（$ json）因为 $ json 不是一个有效的json字符串，正如你在 print_r（$ _ POST ['signed_request']） code>。

I think it failed at json_decode($json) because $json is not a valid json string, as you've mentioned in comment about print_r($_POST['signed_request']);.

根据 Facebook - Canvas页面文档中的身份验证， signed_request 参数已编码，并且解析 signed_request string将产生一个JSON对象。

According to Facebook - Authentication within a Canvas Page Document, the signed_request parameter is encoded and, parsing the signed_request string will yield a JSON object.

如果您使用的是PHP SDK，正如Abhishek在评论中所说， $ facebook-> getSignedRequest（）; 会给你解码的json。

if you're using the PHP SDK, just as Abhishek said in the comment, $facebook->getSignedRequest(); will give you the decoded json.

查看此处了解有关签名请求的详细信息

look here for more details on the Signed Request

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