I add a urlWithParams which is a url with query parameter, for example, https://api.twitter.com/1.1/statuses/home_timeline.json?count=1 The full url will be used by HttpClient. However, when I am building signature string, I have to use the base url, https://api.twitter.com/1.1/statuses/home_timeline.json, and add the query parameter to the sigB…

twitterHack.cs

private async void requestTwitterApi(string url)
{
  string nonce = oAuthUtil.GetNonce();
  string timeStamp = oAuthUtil.GetTimeStamp();
 
  try
  {
    HttpClient httpClient = new HttpClient();
        httpClient.MaxResponseContentBufferSize = int.MaxValue;
        httpClient.DefaultRequestHeaders.ExpectContinue = false;
        HttpRequestMessage requestMsg = new HttpRequestMessage();
        requestMsg.Method = new HttpMethod("GET");                
 
        var urlWithParams = url + "?count=1";
        requestMsg.RequestUri = new Uri(urlWithParams);
 
        string sigBaseStringParams = "count=1";
        sigBaseStringParams += "&" + "oauth_consumer_key=" + consumerKey.Text;
        sigBaseStringParams += "&" + "oauth_nonce=" + nonce;
        sigBaseStringParams += "&" + "oauth_signature_method=" + "HMAC-SHA1";
        sigBaseStringParams += "&" + "oauth_timestamp=" + timeStamp;
        sigBaseStringParams += "&" + "oauth_token=" + accessToken.Text;
        sigBaseStringParams += "&" + "oauth_verifier=" + oAuthVerifier.Text;
        sigBaseStringParams += "&" + "oauth_version=1.0";
        
        string sigBaseString = "GET&";
        sigBaseString += Uri.EscapeDataString(url)+ "&" + Uri.EscapeDataString(sigBaseStringParams);
        
        string signature = oAuthUtil.GetSignature(sigBaseString, consumerSecretKey.Text, accessTokenSecretKey.Text);
        string data = "oauth_consumer_key=\"" + consumerKey.Text
                      +
                      "\", oauth_nonce=\"" + nonce +
                      "\", oauth_signature=\"" + Uri.EscapeDataString(signature) +
                      "\", oauth_signature_method=\"HMAC-SHA1\", oauth_timestamp=\"" + timeStamp +
                      "\", oauth_token=\"" + accessToken.Text +
                      "\", oauth_verifier=\"" + oAuthVerifier.Text +                                                           
                      "\", oauth_version=\"1.0\"";
        requestMsg.Headers.Authorization = new AuthenticationHeaderValue("OAuth", data);                
        var response = await httpClient.SendAsync(requestMsg);
        var text = await response.Content.ReadAsStringAsync();
        WebViewHost.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
        TwitterResponse.Visibility = Windows.UI.Xaml.Visibility.Visible;
        TwitterResponse.Text = text;
    }
    catch (Exception Err)
    {
        throw;
    }
  }
}