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OAuth認証を利用し、TwitterのAPIを利用するためのライブラリ (2011-04版) - C#

注意
修正版のコードがあります。こちらの記事を参照してください。
また、この記事で紹介している方法は 2011年時点の方法です。Twitterの仕様変更等でこのコードでは動作しない可能性が高いため、ご注意ください。
補足
C#で本格的なTwitterアプリケーションを開発する場合は多くのAPIをサポートしているTwitterizerを用いると良いです。

TwitterUtils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.IO;
using System.Text;

namespace iPentec.Twitter
{
  public class TwitterUtils
  {
    const string UPDATE_STATUS            = "http://api.twitter.com/1/statuses/update.xml";
    const string STATUSES_MENTIONS        = "http://api.twitter.com/1/statuses/mentions.xml";
    const string STATUSES_HOME_TIMELINE   = "http://api.twitter.com/1/statuses/home_timeline.json";

    OAuthTwitter oAuth;
    public TwitterUtils()
    {
      oAuth = new OAuthTwitter();
    }

    public void UserStreamsOAuth(string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret)
    {
      
    }
    
    public string StatusesHome_TimeLine(string Parameter, string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      bool useAuthorizationHeader)
    {
      string ret = GetDataOAuth(STATUSES_HOME_TIMELINE, Parameter,
        ConsumerKey, ConsumerSecret, AccessToken, AccessTokenSecret, useAuthorizationHeader);
      return ret;
    }


    public string StatusesMentions(string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      bool useAuthorizationHeader)
    {
      string ret = GetDataOAuth(STATUSES_MENTIONS, "",
        ConsumerKey, ConsumerSecret, AccessToken, AccessTokenSecret, useAuthorizationHeader);
      return ret;
    }
    

    public void UpdateStatus(string status, string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      bool useAuthorizationHeader)
    {
      string encStatus = System.Web.HttpUtility.UrlEncode(status);
      encStatus = string.Format("status={0:s}", encStatus);

      PostDataOAuth(UPDATE_STATUS, encStatus, ConsumerKey, ConsumerSecret, AccessToken, AccessTokenSecret, useAuthorizationHeader);
    }
    
    public string GetOAuthToken(string ConsumerKey, string ConsumerSecret)
    {
      //oAuthTwitter oAuth = new oAuthTwitter();
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;

      string authurl = oAuth.AuthorizationLinkGet();
      return authurl;
    }

    public void GetOAuthAccessToken(string OAuthToken, string ConsumerKey, string ConsumerSecret, 
      out string AccessToken, out string AccessTokenSecret)
    {
      //oAuthTwitter oAuth = new oAuthTwitter();
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      
      oAuth.AccessTokenGet(OAuthToken);
      AccessToken = oAuth.Token;
      AccessTokenSecret = oAuth.TokenSecret;
    }

    public void GetOAuthAccessTokenWithPIN(string PIN, string ConsumerKey, string ConsumerSecret,
      out string AccessToken, out string AccessTokenSecret)
    {
      //oAuthTwitter oAuth = new oAuthTwitter();
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;

      oAuth.AccessTokenGetWithPIN(PIN, oAuth.OAuthToken);
      AccessToken = oAuth.Token;
      AccessTokenSecret = oAuth.TokenSecret;
    }

    private string GetDataOAuth(string url, string parameter,
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret, bool useAuthorizationHeader)
    {
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;
      string xml = oAuth.oAuthWebRequest(OAuthTwitter.Method.GET, url, parameter, "", false, useAuthorizationHeader);
      return xml;
    }

    private string PostDataOAuth(string url, string mes,
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret, bool useAuthorizationHeader)
    {
      //string url = "";
      string xml = "";
      //oAuthTwitter oAuth = new oAuthTwitter();

      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      // 投稿内容をURLエンコードする。
      //mes = "TestMessages";
      /*
      string encMes = System.Web.HttpUtility.UrlEncode(mes);
      
      encMes = string.Format("status={0:s}", encMes);
      */
      xml = oAuth.oAuthWebRequest(OAuthTwitter.Method.POST, url, String.Empty, mes, false, useAuthorizationHeader);
      return xml;
    }

    public void PostPictureToTwitpic(byte[] image, string imageName, string comment, 
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      string TwitpicAPIKey, string PictureContentType)
    {
      string twitpic_api_url = "http://api.twitpic.com/2/upload.json";
      string auth_provider_url = "https://api.twitter.com/1/account/verify_credentials.json";
      string auth_realm_url = "http://api.twitter.com/";

      string contentEncodingStr = "iso-8859-1";
      Encoding contentEncoding = Encoding.GetEncoding(contentEncodingStr);
      
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      oAuth.oAuthEchoWebRequestForTwitpic(OAuthTwitter.Method.POST, twitpic_api_url, auth_provider_url, auth_realm_url,
        image, imageName, comment,
        TwitpicAPIKey, contentEncoding, PictureContentType);
    }

    public void PostPictureToTwipplePhoto(byte[] image, string imageName, 
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret, string PictureContentType)
    {
      string twipple_photo_api_url = "http://p.twipple.jp/api/upload";
      string auth_provider_url = "https://api.twitter.com/1/account/verify_credentials.xml";

      string contentEncodingStr = "iso-8859-1";
      Encoding contentEncoding = Encoding.GetEncoding(contentEncodingStr);

      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      oAuth.oAuthEchoWebRequestForTwipplePhoto(OAuthTwitter.Method.POST, twipple_photo_api_url, auth_provider_url, 
        image, imageName, contentEncoding, PictureContentType);
    }

    public void PostPictureToTwipplePhotoV2(byte[] image, string imageName,
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret, string PictureContentType)
    {
      string twipple_photo_api_url = "http://p.twipple.jp/api/upload2";
      string auth_provider_url = "https://api.twitter.com/1/account/verify_credentials.xml";
      string auth_realm_url = "http://api.twitter.com/";

      string contentEncodingStr = "iso-8859-1";
      Encoding contentEncoding = Encoding.GetEncoding(contentEncodingStr);

      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      oAuth.oAuthEchoWebRequestForTwipplePhotoV2(OAuthTwitter.Method.POST, twipple_photo_api_url, auth_provider_url,
       auth_realm_url, image, imageName, contentEncoding, PictureContentType);
    }

    public void PostPictureToYFrog(byte[] image, string imageName, 
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      string YFrogAPIKey, string PictureContentType)
    {
      string yfrog_api_url = "https://yfrog.com/api/xauth_upload";
      string auth_provider_url = "https://api.twitter.com/1/account/verify_credentials.xml";
      string auth_realm_url = "http://api.twitter.com/";

      string contentEncodingStr = "iso-8859-1";
      Encoding contentEncoding = Encoding.GetEncoding(contentEncodingStr);
      
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      oAuth.oAuthEchoWebRequestForYFrog(OAuthTwitter.Method.POST, yfrog_api_url, auth_provider_url, auth_realm_url,
        image, imageName, YFrogAPIKey, contentEncoding, PictureContentType);

    }

    public void PostPictureToYFrogOld(byte[] image, string imageName, 
      string ConsumerKey, string ConsumerSecret, string AccessToken, string AccessTokenSecret,
      string PictureContentType, string UserName, string Comment)
    {
      string yfrog_api_url = "http://yfrog.com/api/upload";
      string auth_provider_url = "https://api.twitter.com/1/account/verify_credentials.xml";
      string contentEncodingStr = "iso-8859-1";
      Encoding contentEncoding = Encoding.GetEncoding(contentEncodingStr);
      
      oAuth.ConsumerKey = ConsumerKey;
      oAuth.ConsumerSecret = ConsumerSecret;
      oAuth.Token = AccessToken;
      oAuth.TokenSecret = AccessTokenSecret;

      oAuth.oAuthEchoWebRequestForYFrogOld(OAuthTwitter.Method.POST, yfrog_api_url, auth_provider_url,
        image, imageName, Comment, contentEncoding, PictureContentType, UserName);

    }
  }
}

OAuthTwitter.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Net;
using System.IO;
using System.Collections.Specialized;
using System.Text;

namespace iPentec.Twitter
{
  public class OAuthTwitter : OAuthBase
  {
    public enum Method { GET, POST };
    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";
    public const string REALM = "http://twitter.com";
    
    private string _consumerKey = "";
    private string _consumerSecret = "";
    private string _token = "";
    private string _tokenSecret = "";
    private string _pin = "";// JDevlin

    #region Properties
    public string ConsumerKey
    {
      get
      {
        if (_consumerKey.Length == 0) {
          _consumerKey = "";
        }
        return _consumerKey;
      }
      set { _consumerKey = value; }
    }

    public string ConsumerSecret
    {
      get
      {
        if (_consumerSecret.Length == 0) {
          _consumerSecret = "";
        }
        return _consumerSecret;
      }
      set { _consumerSecret = value; }
    }

    public string OAuthToken { get; set; }
    public string Token { get { return _token; } set { _token = value; } }
    public string TokenSecret { get { return _tokenSecret; } set { _tokenSecret = value; } }
    public string PIN { get { return _pin; } set { _pin = value; } }// JDevlin

    #endregion

    /// <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, String.Empty, false, false);
      if (response.Length > 0) {
        //response contains token and token secret.  We only need the token.
        NameValueCollection qs = HttpUtility.ParseQueryString(response);
        if (qs["oauth_token"] != null) {
          OAuthToken = qs["oauth_token"]; // tuck this away for later
          ret = AUTHORIZE + "?oauth_token=" + qs["oauth_token"];
        }
      }
      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>
    public void AccessTokenGet(string authToken)
    {
      this.Token = authToken;

      string response = oAuthWebRequest(Method.GET, ACCESS_TOKEN, String.Empty, String.Empty, false, false);

      if (response.Length > 0) {
        //Store the Token and Token Secret
        NameValueCollection qs = HttpUtility.ParseQueryString(response);
        if (qs["oauth_token"] != null) {
          this.Token = qs["oauth_token"];
        }
        if (qs["oauth_token_secret"] != null) {
          this.TokenSecret = qs["oauth_token_secret"];
        }
      }
    }

    /// <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>
    public void AccessTokenGetWithPIN(string PIN, string OAuthToken)
    {
      this.PIN = PIN;
      this.Token = OAuthToken;

      string response = oAuthWebRequest(Method.GET, ACCESS_TOKEN, String.Empty, String.Empty, true, false);

      if (response.Length > 0) {
        //Store the Token and Token Secret
        NameValueCollection qs = HttpUtility.ParseQueryString(response);
        if (qs["oauth_token"] != null) {
          this.Token = qs["oauth_token"];
        }
        if (qs["oauth_token_secret"] != null) {
          this.TokenSecret = qs["oauth_token_secret"];
        }
      }
    }


    /// <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 parameter, string postData, bool usePIN, bool useAuthorizationHeader)
    {
      string outUrl = "";
      string querystring = "";
      string ret = "";
      string orgurl = url;

      //Setup postData for signing.
      //Add the postData to the querystring.
      if (method == Method.POST) {
        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] = this.UrlEncode(qs[key]);
            qs[key] = this.UrlEncode(qs[key], Encoding.UTF8);
            postData += key + "=" + qs[key];

          }
          if (url.IndexOf("?") > 0) {
            url += "&";
          }
          else {
            url += "?";
          }
          url += postData;
        }
      }
      
      if (method == Method.GET) {
        url += parameter;
      }

      Uri uri = new Uri(url);

      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();

      string sig = "";
      //Generate Signature
      if (usePIN == false) {
        sig = this.GenerateSignature(uri,
           this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
           method.ToString(),
           timeStamp,
           nonce,
           out outUrl,
           out querystring);
      }
      else {
        sig = this.GenerateSignatureWithPIN(uri,
           this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
           method.ToString(),
           timeStamp,
           nonce,
           this.PIN,
           out outUrl,
           out querystring);
      }

      if (useAuthorizationHeader == false) {
        //querystring += "&oauth_signature=" + HttpUtility.UrlEncode(sig);
        querystring += "&oauth_signature=" + HttpUtility.UrlEncode(sig);

        //Convert the querystring to postData
        if (method == Method.POST) {
          postData = querystring;
          querystring = "";
        }

        if (querystring.Length > 0) {
          outUrl += "?";
        }
        ret = WebRequest(method, outUrl + querystring, postData);
      }
      else {
        string AuthorizationHeaderStr = GenerateOAuthAuthorizationHeader(uri,
          this.ConsumerKey, this.Token, this.TokenSecret,
          method.ToString(),
          timeStamp,
          nonce,
          HMACSHA1SignatureType,
          HttpUtility.UrlEncode(sig));

        //headerStr += string.Format("oauth_signature=\"{0:s}\"", HttpUtility.UrlEncode(sig));
        ///ret = WebRequestUseAuthorizationHeader(method, outUrl, postData, AuthorizationHeaderStr);  
        ret = WebRequestUseAuthorizationHeader(method, orgurl, postData, AuthorizationHeaderStr);  
      }
      
      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 = null;
      StreamWriter requestWriter = null;
      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) {
        webRequest.ContentType = "application/x-www-form-urlencoded";

        //POST the data.
        requestWriter = new StreamWriter(webRequest.GetRequestStream());
        try {
          requestWriter.Write(postData);
        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }

      responseData = WebResponseGet(webRequest);

      webRequest = null;

      return responseData;
    }

    /// <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 WebRequestUseAuthorizationHeader(Method method, string url, string postData, string Signature)
    {
      HttpWebRequest webRequest = null;
      StreamWriter requestWriter = null;
      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;

      webRequest.Headers.Add("Authorization", Signature);

      if (method == Method.POST) {
        webRequest.ContentType = "application/x-www-form-urlencoded";

        //POST the data.
        requestWriter = new StreamWriter(webRequest.GetRequestStream());
        try {
          requestWriter.Write(postData);
        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }
      responseData = WebResponseGet(webRequest);
      webRequest = null;
      return responseData;
    }


    /// <returns>The web server response.</returns>
    public string oAuthEchoWebRequestForTwitpic(Method method, string url, string auth_provider_url, string auth_realm_url,
      byte[] image, string imageName, string postMessage,
      string TwitpicAPIKey, Encoding ContentEncoding, string FileContentType)
    {
      HttpWebRequest webRequest = null;
      //StreamWriter requestWriter = null;
      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;

      var boundary = Guid.NewGuid().ToString();
      webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

      string outUrl = "";
      string querystring = "";
      string ret = "";

      //Generate Signature
      Uri uri = new Uri(auth_provider_url);
      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
          "GET",
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      webRequest.Headers.Add("X-Auth-Service-Provider", auth_provider_url);

      string oauthSignaturePattern = "OAuth realm=\"{0:s}\", oauth_consumer_key=\"{1:s}\", oauth_signature_method=\"HMAC-SHA1\","
      + " oauth_token=\"{2:s}\", oauth_timestamp=\"{3:s}\", oauth_nonce=\"{4:s}\", oauth_version=\"1.0\", oauth_signature=\"{5:s}\"";

      string authorizationHeader = string.Format(
                        System.Globalization.CultureInfo.InvariantCulture,
                        oauthSignaturePattern,
                        auth_realm_url,
                        this.ConsumerKey, this.Token,
                        timeStamp,
                        nonce,
                         HttpUtility.UrlEncode(sig));
      webRequest.Headers.Add("X-Verify-Credentials-Authorization", authorizationHeader);
      //webRequest.Method = "POST";
      webRequest.Method = method.ToString();

      if (method == Method.POST) {
        string header = string.Format("--{0}", boundary);
        string footer = string.Format("--{0}--", boundary);

        StringBuilder contents = new StringBuilder();
        contents.AppendLine(header);

        string fileHeader = string.Format("Content-Disposition: file; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);
        //string fileData = Encoding.GetEncoding(contentEncoding).GetString(File.ReadAllBytes(@"c:\sample_image.png"));
        string fileData = ContentEncoding.GetString(image);

        contents.AppendLine(fileHeader);
        contents.AppendLine(string.Format("Content-Type: {0:s}", FileContentType));
        contents.AppendLine();
        contents.AppendLine(fileData);

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "key"));
        contents.AppendLine();
        contents.AppendLine(TwitpicAPIKey);

        contents.AppendLine(header);
        contents.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0:s}\"", "message"));
        contents.AppendLine();
        contents.AppendLine(postMessage + "/" + DateTime.Now.ToString()); // 同じ文字は拒否されるため、時刻を付加

        contents.AppendLine(footer);

        byte[] bytes = ContentEncoding.GetBytes(contents.ToString());
        webRequest.ContentLength = bytes.Length;

        //requestWriter = new StreamWriter(webRequest.GetRequestStream());
        Stream requestWriter = webRequest.GetRequestStream();
        try {
          requestWriter.Write(bytes, 0, bytes.Length);
          //requestWriter.Write(bytes, 0, bytes.Length);

        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }

      responseData = WebResponseGet(webRequest);
      webRequest = null;
      return responseData;

      //HttpWebResponse twitpicResponse = (HttpWebResponse)webRequest.GetResponse();
      //StreamReader reader = new StreamReader(twitpicResponse.GetResponseStream());
      //return twitpicResponse.StatusCode + ": " + reader.ReadToEnd();
    }


    public string oAuthEchoWebRequestForYFrog(Method method, string url, string auth_provider_url, string auth_realm_url,
    byte[] image, string imageName, string YFrogAPIKey, Encoding ContentEncoding, string FileContentType)
    {
      HttpWebRequest webRequest = null;
      //StreamWriter requestWriter = null;
      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;

      var boundary = Guid.NewGuid().ToString();
      webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

      string outUrl = "";
      string querystring = "";
      string ret = "";

      //Generate Signature
      Uri uri = new Uri(auth_provider_url);
      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
          "GET",
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      webRequest.Headers.Add("X-Auth-Service-Provider", auth_provider_url);

      string oauthSignaturePattern = "OAuth realm=\"{0:s}\", oauth_consumer_key=\"{1:s}\", oauth_signature_method=\"HMAC-SHA1\","
      + " oauth_token=\"{2:s}\", oauth_timestamp=\"{3:s}\", oauth_nonce=\"{4:s}\", oauth_version=\"1.0\", oauth_signature=\"{5:s}\"";

      string authorizationHeader = string.Format(
                        System.Globalization.CultureInfo.InvariantCulture,
                        oauthSignaturePattern,
                        auth_realm_url,
                        this.ConsumerKey, this.Token,
                        timeStamp,
                        nonce,
                        HttpUtility.UrlEncode(sig));

      webRequest.Headers.Add("X-Verify-Credentials-Authorization", authorizationHeader);
      //webRequest.Method = "POST";
      webRequest.Method = method.ToString();

      if (method == Method.POST) {
        string header = string.Format("--{0}", boundary);
        string footer = string.Format("--{0}--", boundary);

        StringBuilder contents = new StringBuilder();
        contents.AppendLine(header);

        string fileHeader = string.Format("Content-Disposition: file; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);
        //string fileData = Encoding.GetEncoding(contentEncoding).GetString(File.ReadAllBytes(@"c:\sample_image.png"));
        string fileData = ContentEncoding.GetString(image);

        contents.AppendLine(fileHeader);
        contents.AppendLine(string.Format("Content-Type: {0:s}", FileContentType));
        contents.AppendLine();
        contents.AppendLine(fileData);

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "key"));
        contents.AppendLine();
        contents.AppendLine(YFrogAPIKey);

        contents.AppendLine(footer);

        byte[] bytes = ContentEncoding.GetBytes(contents.ToString());
        webRequest.ContentLength = bytes.Length;

        //requestWriter = new StreamWriter(webRequest.GetRequestStream());
        Stream requestWriter = webRequest.GetRequestStream();
        try {
          requestWriter.Write(bytes, 0, bytes.Length);
          //requestWriter.Write(bytes, 0, bytes.Length);

        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }
      responseData = WebResponseGet(webRequest);
      webRequest = null;
      return responseData;
    }


    public string oAuthEchoWebRequestForYFrogOld(Method method, string url, string auth_provider_url,
      byte[] image, string imageName, string PostMessage, Encoding ContentEncoding, string FileContentType, string UserName)
    {
      HttpWebRequest webRequest = null;
      //StreamWriter requestWriter = null;
      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;

      var boundary = Guid.NewGuid().ToString();
      webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

      string outUrl = "";
      string querystring = "";
      string ret = "";

      //Generate Signature
      Uri uri = new Uri(auth_provider_url);
      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
          "GET",
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      if (method == Method.POST) {
        string header = string.Format("--{0}", boundary);
        string footer = string.Format("--{0}--", boundary);

        StringBuilder contents = new StringBuilder();
        contents.AppendLine(header);

        string fileHeader = string.Format("Content-Disposition: file; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);
        //string fileData = Encoding.GetEncoding(contentEncoding).GetString(File.ReadAllBytes(@"c:\sample_image.png"));
        string fileData = ContentEncoding.GetString(image);

        contents.AppendLine(fileHeader);
        contents.AppendLine(string.Format("Content-Type: {0:s}", FileContentType));
        contents.AppendLine();
        contents.AppendLine(fileData);

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "username"));
        contents.AppendLine();
        contents.AppendLine(UserName);


        string credentialPattern = "oauth_version=1.0&oauth_nonce={0:s}&oauth_timestamp={1:s}&oauth_consumer_key={2:s}&oauth_token={3:s}"
          + "&oauth_signature_method=HMAC-SHA1&oauth_signature={4:s}";
        //string credential = string.Format(credentialPattern, nonce, timeStamp, this.ConsumerKey, this.Token, HttpUtility.UrlEncode(sig));
        string credential = string.Format(credentialPattern, nonce, timeStamp, this.ConsumerKey, this.Token, sig);
        string CredentialURL = auth_provider_url + "?" + credential;

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "verify_url"));
        contents.AppendLine();
        contents.AppendLine(CredentialURL);

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "auth"));
        contents.AppendLine();
        contents.AppendLine("oauth");

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "message"));
        contents.AppendLine();
        contents.AppendLine(PostMessage);

        contents.AppendLine(footer);

        byte[] bytes = ContentEncoding.GetBytes(contents.ToString());
        webRequest.ContentLength = bytes.Length;

        //requestWriter = new StreamWriter(webRequest.GetRequestStream());
        Stream requestWriter = webRequest.GetRequestStream();
        try {
          requestWriter.Write(bytes, 0, bytes.Length);
          //requestWriter.Write(bytes, 0, bytes.Length);

        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }
      responseData = WebResponseGet(webRequest);
      webRequest = null;
      return responseData;
    }


    public string oAuthEchoWebRequestForTwipplePhoto(Method method, string url, string auth_provider_url,
        byte[] image, string imageName, Encoding ContentEncoding, string FileContentType)
    {
      HttpWebRequest webRequest = null;
      string responseData = "";

      webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
      //webRequest.KeepAlive = false;
      webRequest.Method = method.ToString();
      //webRequest.UserAgent = "Jakarta Commons-HttpClient/3.1";

      webRequest.ServicePoint.Expect100Continue = false;
      //webRequest.UserAgent  = "Identify your application please.";
      //webRequest.Timeout = 20000;

      string boundary = Guid.NewGuid().ToString();
      //string boundary = DateTime.Now.ToString("yyyyMMddHHmmss");
      webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

      //Generate Signature
      string outUrl = "";
      string querystring = "";
      string ret = "";

      Uri uri = new Uri(auth_provider_url);
      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
          "GET",
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      string credentialPattern = "oauth_version=1.0&oauth_nonce={0:s}&oauth_timestamp={1:s}&oauth_consumer_key={2:s}&oauth_token={3:s}"
        + "&oauth_signature_method=HMAC-SHA1&oauth_signature={4:s}";

      //URLエンコードし %3dを%3Dに置換する場合
      string UrlEncodeSig = HttpUtility.UrlEncode(sig);
      UrlEncodeSig = UrlEncodeSig.Replace("%3d", "%3D");
      UrlEncodeSig = UrlEncodeSig.Replace("%2b", "%2B");
      string credential = string.Format(credentialPattern, nonce, timeStamp, this.ConsumerKey, this.Token, UrlEncodeSig);


      //URLエンコードしない場合
      //string credential = string.Format(credentialPattern, nonce, timeStamp, this.ConsumerKey, this.Token, sig);
      //URLeエンコードする場合(正しく動作しない)
      //string credential = string.Format(credentialPattern, nonce, timeStamp, this.ConsumerKey, this.Token, HttpUtility.UrlEncode(sig));
      string CredentialURL = auth_provider_url + "?" + credential;

      /*
      string credentialPattern = "oauth_consumer_key={0:s}&&oauth_signature_method=HMAC-SHA1&oauth_timestamp={1:s}&oauth_nonce={2:s}&oauth_version=1.0&oauth_token={3:s}&oauth_signature={4:s}";
      string credential = string.Format(credentialPattern, this.ConsumerKey, timeStamp, nonce, this.Token, sig);
      string CredentialURL = auth_provider_url + "?" + credential;
      */

      if (method == Method.POST) {
        string header = string.Format("--{0}", boundary);
        string footer = string.Format("--{0}--", boundary);

        StringBuilder contents = new StringBuilder();

        //string fileHeader = string.Format("Content-Disposition: file; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "auth"));
        contents.AppendLine("Content-Type: text/plain; charset=US-ASCII");
        contents.AppendLine("Content-Transfer-Encoding: 8bit");
        contents.AppendLine();
        contents.AppendLine("oauth");

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "verify_url"));
        contents.AppendLine("Content-Type: text/plain; charset=US-ASCII");
        contents.AppendLine("Content-Transfer-Encoding: 8bit");
        contents.AppendLine();
        contents.AppendLine(CredentialURL);

        /*
        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "username"));
        contents.AppendLine("Content-Type: text/plain; charset=US-ASCII");
        contents.AppendLine("Content-Transfer-Encoding: 8bit");
        contents.AppendLine();
        contents.AppendLine("");

        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "password"));
        contents.AppendLine("Content-Type: text/plain; charset=US-ASCII");
        contents.AppendLine("Content-Transfer-Encoding: 8bit");
        contents.AppendLine();
        contents.AppendLine("");
        */


        string fileHeader = string.Format("Content-Disposition: form-data; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);
        //string fileData = Encoding.GetEncoding(contentEncoding).GetString(File.ReadAllBytes(@"c:\sample_image.png"));
        string fileData = ContentEncoding.GetString(image);

        contents.AppendLine(header);
        contents.AppendLine(fileHeader);
        contents.AppendLine(string.Format("Content-Type: {0:s}; charset=ISO-8859-1", FileContentType));
        contents.AppendLine("Content-Transfer-Encoding: binary");
        contents.AppendLine();
        contents.AppendLine(fileData);

        contents.AppendLine(footer);

        byte[] bytes = ContentEncoding.GetBytes(contents.ToString());
        webRequest.ContentLength = bytes.Length;

        //requestWriter = new StreamWriter(webRequest.GetRequestStream());
        Stream requestWriter = webRequest.GetRequestStream();
        try {
          requestWriter.Write(bytes, 0, bytes.Length);
          //requestWriter.Write(bytes, 0, bytes.Length);

        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }

      responseData = WebResponseGet(webRequest);
      webRequest = null;
      return responseData;

      //HttpWebResponse twitpicResponse = (HttpWebResponse)webRequest.GetResponse();
      //StreamReader reader = new StreamReader(twitpicResponse.GetResponseStream());
      //return twitpicResponse.StatusCode + ": " + reader.ReadToEnd();
    }

    public string oAuthEchoWebRequestForTwipplePhotoV2(Method method, string url, string auth_provider_url, string auth_realm_url,
      byte[] image, string imageName, Encoding ContentEncoding, string FileContentType)
    {
      HttpWebRequest webRequest = null;
      //StreamWriter requestWriter = null;
      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;

      var boundary = Guid.NewGuid().ToString();
      webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

      string outUrl = "";
      string querystring = "";
      string ret = "";

      //Generate Signature
      Uri uri = new Uri(auth_provider_url);
      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey, this.ConsumerSecret, this.Token, this.TokenSecret,
          "GET",
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      webRequest.Headers.Add("X-Auth-Service-Provider", auth_provider_url);

      string oauthSignaturePattern = "OAuth realm=\"{0:s}\", oauth_consumer_key=\"{1:s}\", oauth_signature_method=\"HMAC-SHA1\","
      + " oauth_token=\"{2:s}\", oauth_timestamp=\"{3:s}\", oauth_nonce=\"{4:s}\", oauth_version=\"1.0\", oauth_signature=\"{5:s}\"";

      string authorizationHeader = string.Format(
                        System.Globalization.CultureInfo.InvariantCulture,
                        oauthSignaturePattern,
                        auth_realm_url,
                        this.ConsumerKey,
                        this.Token,
                        timeStamp,
                        nonce,
                        HttpUtility.UrlEncode(sig));

      webRequest.Headers.Add("X-Verify-Credentials-Authorization", authorizationHeader);
      //webRequest.Method = "POST";
      webRequest.Method = method.ToString();

      if (method == Method.POST) {
        string header = string.Format("--{0}", boundary);
        string footer = string.Format("--{0}--", boundary);

        StringBuilder contents = new StringBuilder();
        contents.AppendLine(header);

        string fileHeader = string.Format("Content-Disposition: file; name=\"{0:s}\"; filename=\"{1:s}\"", "media", imageName);
        //string fileData = Encoding.GetEncoding(contentEncoding).GetString(File.ReadAllBytes(@"c:\sample_image.png"));
        string fileData = ContentEncoding.GetString(image);

        contents.AppendLine(fileHeader);
        contents.AppendLine(string.Format("Content-Type: {0:s}", FileContentType));
        contents.AppendLine();
        contents.AppendLine(fileData);

        /*
        contents.AppendLine(header);
        contents.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0:s}\"", "key"));
        contents.AppendLine();
        contents.AppendLine(YFrogAPIKey);
        */

        contents.AppendLine(footer);

        byte[] bytes = ContentEncoding.GetBytes(contents.ToString());
        webRequest.ContentLength = bytes.Length;

        //requestWriter = new StreamWriter(webRequest.GetRequestStream());
        Stream requestWriter = webRequest.GetRequestStream();
        try {
          requestWriter.Write(bytes, 0, bytes.Length);
          //requestWriter.Write(bytes, 0, bytes.Length);

        }
        catch {
          throw;
        }
        finally {
          requestWriter.Close();
          requestWriter = null;
        }
      }
      responseData = WebResponseGet(webRequest);
      webRequest = null;
      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();
      }
      catch (WebException exc) {
        System.Diagnostics.Debug.WriteLine(exc.Response);
        throw;
      }
      catch {
        throw;
      }
      finally {
        webRequest.GetResponse().GetResponseStream().Close();
        responseReader.Close();
        responseReader = null;
      }

      return responseData;
    }

    /// <summary>
    /// OAuth Signatureのパラメータを取得
    /// </summary>
    /// <param name="url"></param>
    /// <param name="method"></param>
    /// <returns></returns>
    public string GetOAthSignature(string url, Method method)
    {
      string outUrl = "";
      Uri uri = new Uri(url);

      string nonce = this.GenerateNonce();
      string timeStamp = this.GenerateTimeStamp();

      string querystring = "";
      //Generate Signature
      string sig = this.GenerateSignature(uri,
          this.ConsumerKey,
          this.ConsumerSecret,
          this.Token,
          this.TokenSecret,
          method.ToString(),
          timeStamp,
          nonce,
          out outUrl,
          out querystring);

      querystring += "&oauth_signature=" + HttpUtility.UrlEncode(sig);
      return querystring;
    }
  }
}

OAuthBase.cs

using System;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Text;
using System.Web;

namespace iPentec.Twitter
{
  public class OAuthBase
  {

    /// <summary>
    /// Provides a predefined set of algorithms that are supported officially by the protocol
    /// </summary>
    public enum SignatureTypes
    {
      HMACSHA1,
      PLAINTEXT,
      RSASHA1
    }

    /// <summary>
    /// Provides an internal structure to sort the query parameter
    /// </summary>
    protected class QueryParameter
    {
      private string name = null;
      private string value = null;

      public QueryParameter(string name, string value)
      {
        this.name = name;
        this.value = value;
      }

      public string Name
      {
        get { return name; }
      }

      public string Value
      {
        get { return value; }
      }
    }

    /// <summary>
    /// Comparer class used to perform the sorting of the query parameters
    /// </summary>
    protected class QueryParameterComparer : IComparer<QueryParameter>
    {
      #region IComparer<QueryParameter> Members

      public int Compare(QueryParameter x, QueryParameter y)
      {
        if (x.Name == y.Name) {
          return string.Compare(x.Value, y.Value);
        }
        else {
          return string.Compare(x.Name, y.Name);
        }
      }

      #endregion
    }

    protected const string OAuthVersion = "1.0";
    protected const string OAuthParameterPrefix = "oauth_";

    //
    // List of know and used oauth parameters' names
    //        
    protected const string OAuthConsumerKeyKey = "oauth_consumer_key";
    protected const string OAuthCallbackKey = "oauth_callback";
    protected const string OAuthVersionKey = "oauth_version";
    protected const string OAuthSignatureMethodKey = "oauth_signature_method";
    protected const string OAuthSignatureKey = "oauth_signature";
    protected const string OAuthTimestampKey = "oauth_timestamp";
    protected const string OAuthNonceKey = "oauth_nonce";
    protected const string OAuthTokenKey = "oauth_token";
    protected const string OAuthTokenSecretKey = "oauth_token_secret";
    protected const string OAuthVerifierKey = "oauth_verifier"; // JDevlin

    protected const string HMACSHA1SignatureType = "HMAC-SHA1";
    protected const string PlainTextSignatureType = "PLAINTEXT";
    protected const string RSASHA1SignatureType = "RSA-SHA1";

    protected Random random = new Random();

    protected string unreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

    /// <summary>
    /// Helper function to compute a hash value
    /// </summary>
    /// <param name="hashAlgorithm">The hashing algoirhtm used. If that algorithm needs some initialization, like HMAC and its derivatives, they should be initialized prior to passing it to this function</param>
    /// <param name="data">The data to hash</param>
    /// <returns>a Base64 string of the hash value</returns>
    private string ComputeHash(HashAlgorithm hashAlgorithm, string data)
    {
      if (hashAlgorithm == null) {
        throw new ArgumentNullException("hashAlgorithm");
      }

      if (string.IsNullOrEmpty(data)) {
        throw new ArgumentNullException("data");
      }

      byte[] dataBuffer = System.Text.Encoding.ASCII.GetBytes(data);
      byte[] hashBytes = hashAlgorithm.ComputeHash(dataBuffer);

      return Convert.ToBase64String(hashBytes);
    }

    /// <summary>
    /// Internal function to cut out all non oauth query string parameters (all parameters not begining with "oauth_")
    /// </summary>
    /// <param name="parameters">The query string part of the Url</param>
    /// <returns>A list of QueryParameter each containing the parameter name and value</returns>
    private List<QueryParameter> GetQueryParameters(string parameters)
    {
      if (parameters.StartsWith("?")) {
        parameters = parameters.Remove(0, 1);
      }

      List<QueryParameter> result = new List<QueryParameter>();

      if (!string.IsNullOrEmpty(parameters)) {
        string[] p = parameters.Split('&');
        foreach (string s in p) {
          if (!string.IsNullOrEmpty(s) && !s.StartsWith(OAuthParameterPrefix)) {
            if (s.IndexOf('=') > -1) {
              string[] temp = s.Split('=');
              result.Add(new QueryParameter(temp[0], temp[1]));
            }
            else {
              result.Add(new QueryParameter(s, string.Empty));
            }
          }
        }
      }

      return result;
    }

    /// <summary>
    /// This is a different Url Encode implementation since the default .NET one outputs the percent encoding in lower case.
    /// While this is not a problem with the percent encoding spec, it is used in upper case throughout OAuth
    /// </summary>
    /// <param name="value">The value to Url encode</param>
    /// <returns>Returns a Url encoded string</returns>
    protected string UrlEncode(string value)
    {
      StringBuilder result = new StringBuilder();

      foreach (char symbol in value) {
        if (unreservedChars.IndexOf(symbol) != -1) {
          result.Append(symbol);
        }
        else {
          result.Append('%' + String.Format("{0:X2}", (int)symbol));
        }
      }

      return result.ToString();
    }

    protected string UrlEncode(string value, Encoding encode)
    {
      StringBuilder result = new StringBuilder();
      byte[] data = encode.GetBytes(value);
      int len = data.Length;

      for (int i = 0; i < len; i++) {
        int c = data[i];
        if (c < 0x80 && unreservedChars.IndexOf((char)c) != -1) {
          result.Append((char)c);
        }
        else {
          result.Append('%' + String.Format("{0:X2}", (int)data[i]));
        }
      }

      return result.ToString();
    }
    
    /// <summary>
    /// Normalizes the request parameters according to the spec
    /// </summary>
    /// <param name="parameters">The list of parameters already sorted</param>
    /// <returns>a string representing the normalized parameters</returns>
    protected string NormalizeRequestParameters(IList<QueryParameter> parameters)
    {
      StringBuilder sb = new StringBuilder();
      QueryParameter p = null;
      for (int i = 0; i < parameters.Count; i++) {
        p = parameters[i];
        sb.AppendFormat("{0}={1}", p.Name, p.Value);

        if (i < parameters.Count - 1) {
          sb.Append("&");
        }
      }

      return sb.ToString();
    }

    /// <summary>
    /// Generate the signature base that is used to produce the signature
    /// </summary>
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>        
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <param name="signatureType">The signature type. To use the default values use <see cref="OAuthBase.SignatureTypes">OAuthBase.SignatureTypes</see>.</param>
    /// <returns>The signature base</returns>
    public string GenerateSignatureBase(Uri url, string consumerKey, string token, string tokenSecret, string httpMethod, string timeStamp, 
      string nonce, string signatureType, out string normalizedUrl, out string normalizedRequestParameters)
    {
      if (token == null) {
        token = string.Empty;
      }

      if (tokenSecret == null) {
        tokenSecret = string.Empty;
      }

      if (string.IsNullOrEmpty(consumerKey)) {
        throw new ArgumentNullException("consumerKey");
      }

      if (string.IsNullOrEmpty(httpMethod)) {
        throw new ArgumentNullException("httpMethod");
      }

      if (string.IsNullOrEmpty(signatureType)) {
        throw new ArgumentNullException("signatureType");
      }

      normalizedUrl = null;
      normalizedRequestParameters = null;

      List<QueryParameter> parameters = GetQueryParameters(url.Query);
      parameters.Add(new QueryParameter(OAuthVersionKey, OAuthVersion));
      parameters.Add(new QueryParameter(OAuthNonceKey, nonce));
      parameters.Add(new QueryParameter(OAuthTimestampKey, timeStamp));
      parameters.Add(new QueryParameter(OAuthSignatureMethodKey, signatureType));
      parameters.Add(new QueryParameter(OAuthConsumerKeyKey, consumerKey));

      if (!string.IsNullOrEmpty(token)) {
        parameters.Add(new QueryParameter(OAuthTokenKey, token));
      }

      parameters.Sort(new QueryParameterComparer());

      normalizedUrl = string.Format("{0}://{1}", url.Scheme, url.Host);
      if (!((url.Scheme == "http" && url.Port == 80) || (url.Scheme == "https" && url.Port == 443))) {
        normalizedUrl += ":" + url.Port;
      }
      normalizedUrl += url.AbsolutePath;
      normalizedRequestParameters = NormalizeRequestParameters(parameters);

      StringBuilder signatureBase = new StringBuilder();
      signatureBase.AppendFormat("{0}&", httpMethod.ToUpper());
      //signatureBase.AppendFormat("{0}&", UrlEncode(normalizedUrl));
      //signatureBase.AppendFormat("{0}", UrlEncode(normalizedRequestParameters));
      signatureBase.AppendFormat("{0}&", UrlEncode(normalizedUrl));
      signatureBase.AppendFormat("{0}", UrlEncode(normalizedRequestParameters));

      return signatureBase.ToString();
    }

    public string GenerateOAuthAuthorizationHeader(Uri url, string consumerKey, string token, string tokenSecret, string httpMethod, string timeStamp,
      string nonce, string signatureType, string signature)
    {
      //OAuth　ヘッダ用文字列の作成
      string HeaderStr = "OAuth ";
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthConsumerKeyKey, consumerKey);
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthNonceKey, nonce);
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthSignatureMethodKey, signatureType);
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthTimestampKey, timeStamp);
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthTokenKey, token);
      HeaderStr += string.Format("{0:s}=\"{1:s}\",", OAuthVersionKey, OAuthVersion);
      HeaderStr += string.Format("{0:s}=\"{1:s}\"", OAuthSignatureKey, signature);

      //headerStr += string.Format("oauth_signature=\"{0:s}\"", HttpUtility.UrlEncode(sig));
        
      return HeaderStr;
    }

    /// <summary>
    /// Generate the signature base that is used to produce the signature
    /// </summary>
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>        
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <param name="signatureType">The signature type. To use the default values use <see cref="OAuthBase.SignatureTypes">OAuthBase.SignatureTypes</see>.</param>
    /// <returns>The signature base</returns>
    public string GenerateSignatureBase(Uri url, string consumerKey, string token, string tokenSecret, string httpMethod, string timeStamp, 
      string nonce, string PIN, string signatureType, out string normalizedUrl, out string normalizedRequestParameters)
    {
      if (token == null) {
        token = string.Empty;
      }

      if (tokenSecret == null) {
        tokenSecret = string.Empty;
      }

      if (string.IsNullOrEmpty(consumerKey)) {
        throw new ArgumentNullException("consumerKey");
      }

      if (string.IsNullOrEmpty(httpMethod)) {
        throw new ArgumentNullException("httpMethod");
      }

      if (string.IsNullOrEmpty(signatureType)) {
        throw new ArgumentNullException("signatureType");
      }

      normalizedUrl = null;
      normalizedRequestParameters = null;

      List<QueryParameter> parameters = GetQueryParameters(url.Query);
      parameters.Add(new QueryParameter(OAuthVersionKey, OAuthVersion));
      parameters.Add(new QueryParameter(OAuthNonceKey, nonce));
      parameters.Add(new QueryParameter(OAuthTimestampKey, timeStamp));
      parameters.Add(new QueryParameter(OAuthSignatureMethodKey, signatureType));
      parameters.Add(new QueryParameter(OAuthConsumerKeyKey, consumerKey));

      if (!string.IsNullOrEmpty(token)) {
        parameters.Add(new QueryParameter(OAuthTokenKey, token));
      }

      // JDevlin: support for PIN-based auth
      if (!String.IsNullOrEmpty(PIN)) {
        parameters.Add(new QueryParameter(OAuthVerifierKey, PIN));
      }

      parameters.Sort(new QueryParameterComparer());

      normalizedUrl = string.Format("{0}://{1}", url.Scheme, url.Host);
      if (!((url.Scheme == "http" && url.Port == 80) || (url.Scheme == "https" && url.Port == 443))) {
        normalizedUrl += ":" + url.Port;
      }

      normalizedUrl += url.AbsolutePath;
      normalizedRequestParameters = NormalizeRequestParameters(parameters);

      StringBuilder signatureBase = new StringBuilder();
      signatureBase.AppendFormat("{0}&", httpMethod.ToUpper());
      signatureBase.AppendFormat("{0}&", UrlEncode(normalizedUrl));
      signatureBase.AppendFormat("{0}", UrlEncode(normalizedRequestParameters));

      return signatureBase.ToString();
    }

    /// <summary>
    /// Generate the signature value based on the given signature base and hash algorithm
    /// </summary>
    /// <param name="signatureBase">The signature based as produced by the GenerateSignatureBase method or by any other means</param>
    /// <param name="hash">The hash algorithm used to perform the hashing. If the hashing algorithm requires initialization or a key it should be set prior to calling this method</param>
    /// <returns>A base64 string of the hash value</returns>
    public string GenerateSignatureUsingHash(string signatureBase, HashAlgorithm hash)
    {
      return ComputeHash(hash, signatureBase);
    }

    /// <summary>
    /// Generates a signature using the HMAC-SHA1 algorithm
    /// </summary>		
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>
    /// <param name="consumerSecret">The consumer seceret</param>
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <returns>A base64 string of the hash value</returns>
    public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, 
      string timeStamp, string nonce, out string normalizedUrl, out string normalizedRequestParameters)
    {
      return GenerateSignature(url, consumerKey, consumerSecret, token, tokenSecret, httpMethod, timeStamp, nonce, SignatureTypes.HMACSHA1, 
        out normalizedUrl, out normalizedRequestParameters);
    }

    /// <summary>
    /// Generates a signature using the specified signatureType 
    /// </summary>		
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>
    /// <param name="consumerSecret">The consumer seceret</param>
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <param name="signatureType">The type of signature to use</param>
    /// <returns>A base64 string of the hash value</returns>
    public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, 
      string timeStamp, string nonce, SignatureTypes signatureType, out string normalizedUrl, out string normalizedRequestParameters)
    {
      normalizedUrl = null;
      normalizedRequestParameters = null;

      switch (signatureType) {
        case SignatureTypes.PLAINTEXT:
          //return HttpUtility.UrlEncode(string.Format("{0}&{1}", consumerSecret, tokenSecret));
          return HttpUtility.UrlEncode(string.Format("{0}&{1}", consumerSecret, tokenSecret), Encoding.UTF8);
        case SignatureTypes.HMACSHA1:
          string signatureBase = GenerateSignatureBase(url, consumerKey, token, tokenSecret, httpMethod, timeStamp, nonce, HMACSHA1SignatureType, out normalizedUrl, out normalizedRequestParameters);

          HMACSHA1 hmacsha1 = new HMACSHA1();
          //hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}", UrlEncode(consumerSecret), string.IsNullOrEmpty(tokenSecret) ? "" : UrlEncode(tokenSecret)));
          hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}", UrlEncode(consumerSecret), string.IsNullOrEmpty(tokenSecret) ? "" : UrlEncode(tokenSecret)));

          return GenerateSignatureUsingHash(signatureBase, hmacsha1);
        case SignatureTypes.RSASHA1:
          throw new NotImplementedException();
        default:
          throw new ArgumentException("Unknown signature type", "signatureType");
      }
    }


    /// <summary>
    /// Generates a signature using the HMAC-SHA1 algorithm
    /// </summary>		
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>
    /// <param name="consumerSecret">The consumer seceret</param>
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <returns>A base64 string of the hash value</returns>
    public string GenerateSignatureWithPIN(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, string timeStamp, string nonce, /* JDevlin*/ string PIN, out string normalizedUrl, out string normalizedRequestParameters)
    {
      return GenerateSignatureWithPIN(url, consumerKey, consumerSecret, token, tokenSecret, httpMethod, timeStamp, nonce, PIN, SignatureTypes.HMACSHA1, out normalizedUrl, out normalizedRequestParameters);
    }

    /// <summary>
    /// Generates a signature using the specified signatureType 
    /// </summary>		
    /// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
    /// <param name="consumerKey">The consumer key</param>
    /// <param name="consumerSecret">The consumer seceret</param>
    /// <param name="token">The token, if available. If not available pass null or an empty string</param>
    /// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
    /// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
    /// <param name="signatureType">The type of signature to use</param>
    /// <returns>A base64 string of the hash value</returns>
    public string GenerateSignatureWithPIN(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, string timeStamp,
      string nonce, string PIN /*JDevlin*/, SignatureTypes signatureType, out string normalizedUrl, out string normalizedRequestParameters)
    {
      normalizedUrl = null;
      normalizedRequestParameters = null;

      switch (signatureType) {
        case SignatureTypes.PLAINTEXT:
          return HttpUtility.UrlEncode(string.Format("{0}&{1}", consumerSecret, tokenSecret));
        case SignatureTypes.HMACSHA1:
          string signatureBase = GenerateSignatureBase(url, consumerKey, token, tokenSecret, httpMethod, timeStamp, nonce, PIN, HMACSHA1SignatureType, out normalizedUrl, out normalizedRequestParameters);

          HMACSHA1 hmacsha1 = new HMACSHA1();
          hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}", UrlEncode(consumerSecret), string.IsNullOrEmpty(tokenSecret) ? "" : UrlEncode(tokenSecret)));

          return GenerateSignatureUsingHash(signatureBase, hmacsha1);
        case SignatureTypes.RSASHA1:
          throw new NotImplementedException();
        default:
          throw new ArgumentException("Unknown signature type", "signatureType");
      }
    }

    /// <summary>
    /// Generate the timestamp for the signature        
    /// </summary>
    /// <returns></returns>
    public virtual string GenerateTimeStamp()
    {
      // Default implementation of UNIX time of the current UTC time
      TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
      return Convert.ToInt64(ts.TotalSeconds).ToString();
    }

    /// <summary>
    /// Generate a nonce
    /// </summary>
    /// <returns></returns>
    public virtual string GenerateNonce()
    {
      // Just a simple implementation of a random number between 123400 and 9999999
      return random.Next(123400, 9999999).ToString();
    }

  }
}
著者
ジョニー
iPentecのプログラマー、最近はAIの積極的な活用にも取り組み中。
とっても恥ずかしがり。
掲載日: 2011-04-23
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