--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Agendas/trunk/src/Agendas.Twitter/oAuthTwitter.cs	Sat Jun 04 22:46:06 2011 -0300
@@ -0,0 +1,257 @@
+using System;
+using System.Configuration;
+using System.Web;
+using System.Net;
+using System.IO;
+using System.Collections.Specialized;
+
+namespace AltNetHispano.Agendas.Twitter
+{
+    public class OAuthTwitter : OAuthBase
+    {
+        public enum Method { GET, POST, DELETE };
+        public const string REQUEST_TOKEN = "http://twitter.com/oauth/request_token";
+        public const string AUTHORIZE = "http://twitter.com/oauth/authorize";
+        public const string ACCESS_TOKEN = "http://twitter.com/oauth/access_token";
+
+        private string _consumerKey = "";
+        private string _consumerSecret = "";
+        private string _token = "";
+        private string _tokenSecret = "";
+        private string _callBackUrl = "oob";
+        private string _oauthVerifier = "";
+
+    	private string ConsumerKey 
+        {
+            get
+            {
+                if (_consumerKey.Length == 0)
+                {
+                    _consumerKey = ConfigurationManager.AppSettings["consumerKey"];
+                }
+                return _consumerKey; 
+            }
+        }
+
+    	private string ConsumerSecret { 
+            get {
+                if (_consumerSecret.Length == 0)
+                {
+                    _consumerSecret = ConfigurationManager.AppSettings["consumerSecret"];
+                }
+                return _consumerSecret; 
+            } 
+        }
+
+        public string Token { get { return _token; } set { _token = value; } }
+        public string TokenSecret { get { return _tokenSecret; } set { _tokenSecret = value; } }
+        public string CallBackUrl { get { return _callBackUrl; } set { _callBackUrl = value; } }
+        public string OAuthVerifier { get { return _oauthVerifier; } set { _oauthVerifier = value; } }
+
+        /// <summary>
+        /// Get the link to Twitter's authorization page for this application.
+        /// </summary>
+        /// <returns>The url with a valid request token, or a null string.</returns>
+        public string AuthorizationLinkGet()
+        {
+            string ret = null;
+
+            string response = OAuthWebRequest(Method.GET, REQUEST_TOKEN, String.Empty);
+            if (response.Length > 0)
+            {
+                //response contains token and token secret.  We only need the token.
+                NameValueCollection qs = HttpUtility.ParseQueryString(response);
+
+                if (qs["oauth_callback_confirmed"] != null)
+                {
+                    if (qs["oauth_callback_confirmed"] != "true")
+                    {
+                        throw new Exception("OAuth callback not confirmed.");
+                    }
+                }
+
+                if (qs[OAuthTokenKey] != null)
+                {
+					ret = AUTHORIZE + "?" + OAuthTokenKey + "=" + qs[OAuthTokenKey];
+                }
+            }
+            return ret;
+        }
+
+        /// <summary>
+        /// Exchange the request token for an access token.
+        /// </summary>
+        /// <param name="authToken">The oauth_token is supplied by Twitter's authorization page following the callback.</param>
+        /// <param name="oauthVerifier">An oauth_verifier parameter is provided to the client either in the pre-configured callback URL</param>
+        public void AccessTokenGet(string authToken, string oauthVerifier)
+        {
+            Token = authToken;
+            OAuthVerifier = oauthVerifier;
+
+            string response = OAuthWebRequest(Method.GET, ACCESS_TOKEN, String.Empty);
+
+            if (response.Length > 0)
+            {
+                //Store the Token and Token Secret
+                NameValueCollection qs = HttpUtility.ParseQueryString(response);
+                if (qs[OAuthTokenKey] != null)
+                {
+					Token = qs[OAuthTokenKey];
+                }
+				if (qs[OAuthTokenSecretKey] != null)
+                {
+					TokenSecret = qs[OAuthTokenSecretKey];
+                }
+            }
+        }
+        
+        /// <summary>
+        /// Submit a web request using oAuth.
+        /// </summary>
+        /// <param name="method">GET or POST</param>
+        /// <param name="url">The full url, including the querystring.</param>
+        /// <param name="postData">Data to post (querystring format)</param>
+        /// <returns>The web server response.</returns>
+        public string OAuthWebRequest(Method method, string url, string postData)
+        {
+            string outUrl;
+            string querystring;
+            string ret;
+
+
+            //Setup postData for signing.
+            //Add the postData to the querystring.
+            if (method == Method.POST || method == Method.DELETE)
+            {
+                if (postData.Length > 0)
+                {
+                    //Decode the parameters and re-encode using the oAuth UrlEncode method.
+                    NameValueCollection qs = HttpUtility.ParseQueryString(postData);
+                    postData = "";
+                    foreach (string key in qs.AllKeys)
+                    {
+                        if (postData.Length > 0)
+                        {
+                            postData += "&";
+                        }
+                        qs[key] = HttpUtility.UrlDecode(qs[key]);
+                        qs[key] = UrlEncode(qs[key]);
+                        postData += key + "=" + qs[key];
+
+                    }
+                    if (url.IndexOf("?") > 0)
+                    {
+                        url += "&";
+                    }
+                    else
+                    {
+                        url += "?";
+                    }
+                    url += postData;
+                }
+            }
+
+            var uri = new Uri(url);
+            
+            string nonce = GenerateNonce();
+            string timeStamp = GenerateTimeStamp();
+
+            //Generate Signature
+            string sig = GenerateSignature(uri,
+                ConsumerKey,
+                ConsumerSecret,
+                Token,
+                TokenSecret,
+                CallBackUrl,
+                OAuthVerifier,
+                method.ToString(),
+                timeStamp,
+                nonce,
+                out outUrl,
+                out querystring);
+
+        	querystring += "&" + OAuthSignatureKey + "=" + UrlEncode(sig);
+
+            //Convert the querystring to postData
+            if (method == Method.POST || method == Method.DELETE)
+            {
+                postData = querystring;
+                querystring = "";
+            }
+
+            if (querystring.Length > 0)
+            {
+                outUrl += "?";
+            }
+
+            ret = WebRequest(method, outUrl +  querystring, postData);
+
+            return ret;
+        }
+
+        /// <summary>
+        /// Web Request Wrapper
+        /// </summary>
+        /// <param name="method">Http Method</param>
+        /// <param name="url">Full url to the web resource</param>
+        /// <param name="postData">Data to post in querystring format</param>
+        /// <returns>The web server response.</returns>
+        public string WebRequest(Method method, string url, string postData)
+        {
+            HttpWebRequest webRequest;
+            StreamWriter requestWriter;
+            string responseData;
+
+            webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
+            webRequest.Method = method.ToString();
+            webRequest.ServicePoint.Expect100Continue = false;
+            //webRequest.UserAgent  = "Identify your application please.";
+            //webRequest.Timeout = 20000;
+
+            if (method == Method.POST || method == Method.DELETE)
+            {
+                webRequest.ContentType = "application/x-www-form-urlencoded";
+
+                //POST the data.
+                requestWriter = new StreamWriter(webRequest.GetRequestStream());
+                try
+                {
+                    requestWriter.Write(postData);
+                }
+                finally
+                {
+                    requestWriter.Close();
+                }
+            }
+
+            responseData = WebResponseGet(webRequest);
+
+        	return responseData;
+
+        }
+
+        /// <summary>
+        /// Process the web response.
+        /// </summary>
+        /// <param name="webRequest">The request object.</param>
+        /// <returns>The response data.</returns>
+        public string WebResponseGet(HttpWebRequest webRequest)
+        {
+            StreamReader responseReader = null;
+            string responseData;
+
+            try
+            {
+                responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
+                responseData = responseReader.ReadToEnd();
+            }
+            finally
+            {
+                webRequest.GetResponse().GetResponseStream().Close();
+                responseReader.Close();
+            }
+
+            return responseData;
+        }
+    }
+}