在没有身份验证的情况下解码签名请求

问题描述

我们是否能够使用 Facebook C# SDK 解码传递到 Facebook 标签页的 signed_request 参数，不使用身份验证?基本上，我正在寻找一种方法来解码和解析 signed_request 包含的页面 JSON 对象.

Are we able to use the Facebook C# SDK to decode the signed_request parameter that is passed to the Facebook Tab page, without using Authentication? Basically, I am looking for a way to decode and parse the page JSON object that the signed_request contains.

我正在寻找 .NET C# 等效于在此 PHP 示例中完成相同类型的解码:检查用户是否喜欢页面的无缝方式

I am looking for the .NET C# equivelent to accomplishing the same type of decode in this PHP example: Seamless way to check if user likes page

推荐答案

我只是粘贴我在另一篇文章中回答过的相同答案.

I am just pasting same answer I have answered in another post.

Facebook 中仅限粉丝的内容asp.net C# SDK

当您的网页在 facebook 画布应用程序中加载时，您会收到签名请求；您应该能够解析类似于以下内容的签名请求:

You get signed request when your web page is loaded within facebook canvas app; you should be able to parse signed request something similar to following:

if (Request.Params["signed_request"] != null)
{
    string payload = Request.Params["signed_request"].Split('.')[1];
    var encoding = new UTF8Encoding();
    var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
    var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 - decodedJson.Length % 4) % 4, '='));
    var json = encoding.GetString(base64JsonArray);
    var o = JObject.Parse(json);
    var lPid = Convert.ToString(o.SelectToken("page.id")).Replace(""", "");
    var lLiked = Convert.ToString(o.SelectToken("page.liked")).Replace(""", "");
    var lUserId= Convert.ToString(o.SelectToken("user_id")).Replace(""", "");
}

您需要添加对 json 库的引用才能在 C# 中解析签名请求，请从 http://json 下载.codeplex.com/

You need to add reference to json libraries in order to parse signed requestin C#, download from http://json.codeplex.com/

另请参阅如何为 C# 中的 Canvas 签名请求解码 OAuth 2.0? 如果您对签名请求感到厌烦.

Also refere to How to decode OAuth 2.0 for Canvas signed_request in C#? if you are worndering about signed request.

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