使用c#强制签名请求到Instagram

我正在尝试与Instagram API进行通信，并希望按照下面给出的链接使用签名请求与API进行安全通信

https://instagram.com/developer/secure-api-requests/

在默认页面，我简单地获取客户端密钥，客户端密码和重定向URL等详细信息，并通过Instagram进行认证。

验证后，在重定向URL，下面是我的代码:

//To Get Access Token
var json = "";
 NameValueCollection parameters = new NameValueCollection();
                parameters.Add("client_id", ConfigurationManager.AppSettings["instagram.clientid"].ToString());
                parameters.Add("client_secret", ConfigurationManager.AppSettings["instagram.clientsecret"].ToString());
                parameters.Add("grant_type", "authorization_code");
                parameters.Add("redirect_uri", ConfigurationManager.AppSettings["instagram.redirecturi"].ToString());
                parameters.Add("code", code);
                WebClient client = new WebClient();
                var result = client.UploadValues("https://api.instagram.com/oauth/access_token", "POST", parameters);
                var response = System.Text.Encoding.Default.GetString(result);
                // deserializing nested JSON string to object
                var jsResult = (JObject)JsonConvert.DeserializeObject(response);
                string accessToken = (string)jsResult["access_token"];
                int id = (int)jsResult["user"]["id"];
Page.ClientScript.RegisterStartupScript(this.GetType(), "GetToken", "<script>var instagramaccessid='"" + @"" + id + "" + "'"; var instagramaccesstoken='"" + @"" + accessToken + "" + "'";</script>");

在获得访问令牌之后，让我们说我从Instagram获得了热门照片。下面是保存热门照片的div

 <div style="clear:both;"></div>
        <div>
            <h1>
                Popular Pictures</h1>
            <div id="PopularPhotosDiv">
                <ul id="photosUL1">
                </ul>
            </div>
        </div>

然后使用下面的函数来填充热门照片

的div

 <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {           
            GetPopularPhotos();
           
        });
function GetPopularPhotos() {
            $("#photosUL1").html("");
            $.ajax({
                type: "GET",
                async: true,
                contentType: "application/json; charset=utf-8",
                //Most popular photos
                url: "https://api.instagram.com/v1/media/popular?access_token=" + instagramaccesstoken,
                dataType: "jsonp",
                cache: false,
                beforeSend: function () {
                    $("#loading").show();
                },
                success: function (data)
                {
                    $("#loading").hide();
                    if (data == "") {
                        $("#PopularPhotosDiv").hide();
                    } else {
                        $("#PopularPhotosDiv").show();
                        for (var i = 0; i < data["data"].length; i++) {
                            $("#photosUL1").append("<li style='float:left;list-style:none;'><a target='_blank' href='" + data.data[i].link + "'><img src='" + data.data[i].images.thumbnail.url + "'></img></a></li>");
                        }
                    }
                }
            });
        }

这段代码工作得很好，我只是想把它作为一个签名请求发送。

static string GenerateSignature(string endpoint, Dictionary<string,string> parameters, string secret)
{
    // Build the message to be authenticated
    StringBuilder message = new StringBuilder(endpoint);
    foreach (var param in parameters.OrderBy(p => p.Key))
    {
        message.AppendFormat("|{0}={1}", param.Key, param.Value);
    }
    // Create a HMAC-SHA256 digest of the message using the secret key
    HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(secret));
    byte[] digest = hmac.ComputeHash(Encoding.UTF8.GetBytes(message.ToString()));
    // Return the digest as a hexstring to be used as a signature for the request
    return ByteArrayToString(digest);
}
static string ByteArrayToString(byte[] array)
{
    // Convert the bytes in the array to a lower-case hexstring
    return array.Aggregate(new StringBuilder(), (sb, b) => sb.Append(b.ToString("x2"))).ToString();
}
static void Main(string[] args)
{
    string secret = "6dc1787668c64c939929c17683d7cb74";
    string endpoint;
    Dictionary<string, string> parameters;
    string signature;
    // Example 1
    endpoint = "/users/self";
    parameters = new Dictionary<string, string>
    {
        { "access_token", "fb2e77d.47a0479900504cb3ab4a1f626d174d2d" },
    };
    signature = GenerateSignature(endpoint, parameters, secret);
    Console.WriteLine("sig={0}", signature);
    // Example 2
    endpoint = "/media/657988443280050001_25025320";
    parameters = new Dictionary<string, string>
    {
        { "access_token", "fb2e77d.47a0479900504cb3ab4a1f626d174d2d" },
        { "count", "10" },
    };
    signature = GenerateSignature(endpoint, parameters, secret);
    Console.WriteLine("sig={0}", signature);
    Console.ReadKey(true);
}