public TweetCount fetchCount(string topic, string city_name)
{
LatLng l = new LatLng();
l.getLatLng(city_name);
string geocode = l.lat + "," + l.lng + ",10km";
string param_string = topic; // +"&geocode" + geocode;
string url = "https://api.twitter.com/1.1/search/tweets.json?q=" + param_string;
// Create OAuth parameters for twitter API
string oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
TimeSpan time_span = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
string oauthtimestamp = Convert.ToInt64(time_span.TotalSeconds).ToString();
SortedDictionary<string, string> basestringParameters = new SortedDictionary<string, string>();
basestringParameters.Add("q", topic);
//basestringParameters.Add("geocode", geocode);
basestringParameters.Add("oauth_version", oauth_version);
basestringParameters.Add("oauth_consumer_key", oauth_consumer_key);
basestringParameters.Add("oauth_nonce", oauth_nonce);
basestringParameters.Add("oauth_signature_method", oauth_signature_method);
basestringParameters.Add("oauth_timestamp", oauthtimestamp);
basestringParameters.Add("oauth_token", oauth_token);
//Build the signature string
string baseString = String.Empty;
baseString += "GET" + "&";
baseString += Uri.EscapeDataString(url.Split('?')[0]) + "&";
foreach (KeyValuePair<string, string> entry in basestringParameters)
{
baseString += Uri.EscapeDataString(entry.Key + "=" + entry.Value + "&");
}
//Remove the trailing ambersand char last 3 chars - %26
baseString = baseString.Substring(0, baseString.Length - 3);
//Build the signing key
string signingKey = Uri.EscapeDataString(oauth_consumer_secret) + "&" + Uri.EscapeDataString(oauth_token_secret);
//Sign the request
HMACSHA1 hasher = new HMACSHA1(new ASCIIEncoding().GetBytes(signingKey));
string oauthsignature = Convert.ToBase64String(hasher.ComputeHash(new ASCIIEncoding().GetBytes(baseString)));
//Tell Twitter we don't do the 100 continue thing
ServicePointManager.Expect100Continue = false;
//authorization header
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(@url);
string authorizationHeaderParams = String.Empty;
authorizationHeaderParams += "OAuth ";
authorizationHeaderParams += "oauth_nonce=\"" + Uri.EscapeDataString(oauth_nonce) + "\",";
authorizationHeaderParams += "oauth_signature_method=\"" + Uri.EscapeDataString(oauth_signature_method) + "\",";
authorizationHeaderParams += "oauth_timestamp=\"" + Uri.EscapeDataString(oauthtimestamp) + "\",";
authorizationHeaderParams += "oauth_consumer_key=\"" + Uri.EscapeDataString(oauth_consumer_key) + "\",";
authorizationHeaderParams += "oauth_token=\"" + Uri.EscapeDataString(oauth_token) + "\",";
authorizationHeaderParams += "oauth_signature=\"" + Uri.EscapeDataString(oauthsignature) + "\",";
authorizationHeaderParams += "oauth_version=\"" + Uri.EscapeDataString(oauth_version) + "\"";
webRequest.Headers.Add("Authorization", authorizationHeaderParams);
webRequest.Method = "GET";
webRequest.ContentType = "application/x-www-form-urlencoded";
TweetCount tc = new TweetCount();
//Allow us a reasonable timeout in case Twitter's busy
webRequest.Timeout = 3 * 60 * 1000;
try
{
//Proxy settings
HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse;
Stream dataStream = webResponse.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
XmlDocument doc = ConvertJsonToXml(responseFromServer);
XmlNodeList items = doc.GetElementsByTagName("item");
tc.Count = Convert.ToString(items.Count);
tc.Tweets = new List<Tweets>();
XmlNodeList tweets = doc.GetElementsByTagName("text");
foreach (XmlNode t in tweets)
{
Tweets tt = new Tweets();
tt.Text = t.InnerText;
tc.Tweets.Add(tt);
}
}
catch (Exception ex)
{
tc.Error = ex.Message;
}
return tc;
}