Asp.Net MVC3 Razor with facebook Authentication

Dinkar Chavhan
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Today we have to see Asp.Net MVC3 Razor with facebook Authentication before we see details first u have to Register u r Application in facebook developer(https://developers.facebook.com/apps).and u got AppID.

Ok now lets see step by step

Step 1 :Open VS 2010 go to project and select Asp.Net MVC 3 Web Application

Step 2 :select empty and select Razor

Step 3 :Now go to Controllers and right click and give Some name like Home Controllers and add this code

          public ActionResult Index()
        {
            if (!string.IsNullOrEmpty(Request.Params["signed_request"]))
            {
                ViewBag.IsAuthenticated =true;
                Dictionary<string,string> info = Utility.DecodePayload(Request.Params["signed_request"]);
                Session["access_token"] = info;
                Facebook.FacebookAPI api = new Facebook.FacebookAPI(info["oauth_token"]);
                var json = api.Get("/me");
            }
            else
                ViewBag.IsAuthenticated = false;
            return View();
         }

Step 4 :Now go to Model and

create utility class(Here u have to Add Facebook API throw reference in our App)

public class Utility
{
    public static Dictionary<string, string> DecodePayload(string payload)
    {
        var parameters = new Dictionary<string, string>();

        try
        {
            string[] sB64String = payload.Split('.');
            payload = payload.Replace((sB64String[0] + "."), string.Empty);
            //End
            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 jObject = JSONObject.CreateFromString(json);
            //parameters.Add("liked", jObject.Dictionary["page"].Dictionary["liked"].Boolean.ToString());
            {
              parameters.Add("isAuthorized", "true");
                parameters.Add("oauth_token", jObject.Dictionary["oauth_token"].String);
                parameters.Add("profile_id", jObject.Dictionary["user_id"].String);
            }
            else
            {
                parameters.Add("isAuthorized", "false");
                parameters.Add("oauth_token", string.Empty);
            }

        }
        catch { }

        return parameters;
    }
}

Step 5 :now go to Home Controllers and right click on Index and add View after adding u have to write this code

index.chtml code is

</div>
<script>

// assume we are already logged in
FB.init({ appId: '161729093918865', xfbml: true, cookie: true, oauth: true });

if ([email protected]().ToLower())

{
window.top.location = "http://www.facebook.com/connect/uiserver.php"
+ "?app_id=" + '161729093918865'
+ "&next=" + 'http://apps.facebook.com/spatialidea/'
+ "&display=page"
+ "&cancel_url=" + 'http://www.facebook.com/'
+ "&locale=en_IN"
+ "&perms=publish_stream,email&method=permissions.request"
+ "&return_session=1&session_version=3&fbconnect=0&canvas=1&legacy_return=1";
}
</script>
</body>
</html>

Step 6 : Now run the App