Question

我正在尝试使用C＃语言中的以下代码获取访问令牌，但我收到了400个错误的请求异常。

代码：

WebRequest httpWReq = WebRequest.Create("https://www.box.com/api/oauth2/token");


string postData = "grant_type=authorization_code"; 
postData += "&code=" + Code; 
postData += "&client_id=MY_CLIENT_ID"; 
postData += "&client_secret=MY_CLIENT_SECRET"; 
postData += "&redirect_uri=https://www.google.com";

byte[] data = Encoding.UTF8.GetBytes(postData); 
httpWReq.Method = "POST"; 
httpWReq.ContentType = "application/x-www-form-urlencoding"; 
httpWReq.ContentLength = data.Length; 

using (Stream stream = httpWReq.GetRequestStream()) 
{ 
    stream.Write(data, 0, data.Length); 
}

var response = httpWReq.GetResponse();
var responseStream = response.GetResponseStream();
using (var reader = new StreamReader(responseStream))
{
    var responseReader = reader.ReadToEnd();
    MessageBox.Show(responseReader);
}

但我总是得到以下错误：

{"error":"invalid_request","error_description":"Invalid grant_type parameter or parameter missing"}

如何克服这个问题？

任何帮助将不胜感激。在此先感谢。

谢谢，哈里什雷迪

Answer 1

我看到两个可能的问题，都是这一行：

postData += "&redirect_uri=https://www.google.com";

我认为您需要对重定向URI进行urlencode。
我认为您不拥有 google.com 域名，因此这是一个无效的值。 :)您需要回到您提出请求的域名。或者更好的是，在Box应用程序的配置页面上预设此重定向URI。

顺便提一下，您可能有兴趣查看GitHub和NuGet上的Box API v2 SDK for .Net（以及相应的MVC-based OAuth example）。（完全披露：我对两者都有贡献。）

Answer 2

HttpWebRequest httpWReq =
                (HttpWebRequest)WebRequest.Create("https://api.box.com/oauth2/token");

            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = "grant_type=authorization_code";
            postData += "&code=" + authorizationCode;
            postData += "&client_id=" + ClientId;
            postData += "&client_secret=" + ClientSecretId;
            byte[] data = encoding.GetBytes(postData);

            httpWReq.Method = "POST";
            httpWReq.ContentType = "application/x-www-form-urlencoded";
            //httpWReq.ContentType = "application/x-www-form-urlencoded";
            httpWReq.ContentLength = data.Length;

            using (Stream stream = httpWReq.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

C＃4.0中Box的身份验证

2 个答案: