Newbie Needs help with basic MVC Oauth Twitter set up - asp.net-mvc

Question

I'm a hobby developer and I am fiddlng around with asp.net MVC and was trying to just get the basic Oauth to work via Twitter.
All I did was put a controller named Twitter with this code:
(it's from an online example for webforms but i slightly modified it and put it into 2 action methods, index and callback.. is this right way to do it ?)
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Ajax;
using OAuthLibrary;
namespace mvcTwit.Controllers
{
public class TwitterController : Controller
{
private const string AccessUrl = "http://twitter.com/oauth/access_token";
private const string AuthorizeUrl = "http://twitter.com/oauth/authorize?oauth_token={0}";
private const string RequestUrl = "http://twitter.com/oauth/request_token";
//
// GET: /Twitter/
public ActionResult Index()
{
// add these to web.config
var consumerKey = ConfigurationManager.AppSettings["consumerKey"];
var consumerSecret = ConfigurationManager.AppSettings["consumerSecret"];
// look for an access token in the callback
var requestToken = Request.QueryString["oauth_token"];
if (requestToken == null)
{
requestToken = OAuth.GetRequestToken(RequestUrl,
consumerKey,
consumerSecret);
var collection = HttpUtility.ParseQueryString(requestToken);
var authorizeUrl = String.Format(AuthorizeUrl,
collection[0]);
Response.Redirect(authorizeUrl);
}
return View();
}
public ActionResult Callback(string oauth_token)
{
var consumerKey = ConfigurationManager.AppSettings["consumerKey"];
var consumerSecret = ConfigurationManager.AppSettings["consumerSecret"];
//var requestToken = Request.QueryString["oauth_token"];
var requestToken = oauth_token;
// oauth is complete and callback is returning
// the possibly authorized request token
var collection = HttpUtility.ParseQueryString(requestToken);
// obtain access token
var accessToken = OAuth.GetAccessToken(AccessUrl,
consumerKey,
consumerSecret,
collection[0],
collection[1]);
collection = HttpUtility.ParseQueryString(accessToken);
// make a Twitter request with the access token and secret
var url = "http://twitter.com/account/verify_credentials.xml";
var verify = OAuth.GetProtectedResource(url,
"GET",
consumerKey,
consumerSecret,
collection[0],
collection[1]);
ViewData["oauth_token"] = verify;
return View();
}
}
}
When i go to mysite.com/Twitter, it does its thing and takes me to twitter.com/oauth/authorize?oauth_token=(long string here)
Then after i fill in my u/n and p/w, it takes me back to my site:
mysite.com/Twitter/callback?oauth_token=(long string)
but the error on the page is:
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
My question is, is the signature of the Callback action correct because it expects a string back from twitter. And obviously I need to add a route in my global.asax file. What would that route look like?.. I have tried everything and i can't get it to work. Is the root of my issue or am i making a programming mistake..lol
Don't be hard on me, i'm no expert, but just learning as i go.
And, I'm testing this on a website, not localhost.
Thank You.
p.s. I have spent way to long on this and am looking for help as a last resort, so thanks for your kindness.

Answer 1

Looks like var collection = HttpUtility.ParseQueryString(requestToken); is not returning you two results as you expect;
var accessToken = OAuth.GetAccessToken(
AccessUrl, consumerKey, consumerSecret,
collection[0], collection[1]); <<-- this line is your problem?
I think you need to split the collection[0] into the two Oauth token parts.