public async static Task <string> Lookup(string link)
{
try
{
string longUrl;
if (ShortToLongUrl.TryGetValue(link, out longUrl))
{
return(longUrl);
}
var url = "http://api.longurl.org/v2/expand?format=json&url=" + OAuth.UrlEncode(link);
var request = WebRequestWrapper.Create(new Uri(url));
request.UserAgent = "tweetz/5.0";
request.Timeout = 1500;
using (var response = await request.GetResponseAsync())
{
var serializer = new DataContractJsonSerializer(typeof(LongUrlResponse));
var longUrlResponse = (LongUrlResponse)serializer.ReadObject(response.GetResponseStream());
if (string.IsNullOrWhiteSpace(longUrlResponse.LongUrl) == false)
{
if (ShortToLongUrl.Count > 1000)
{
ShortToLongUrl.Clear();
}
ShortToLongUrl.TryAdd(link, longUrlResponse.LongUrl);
return(longUrlResponse.LongUrl);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return(link);
}
private static string Shorten(string link)
{
var url = "http://is.gd/create.php?format=simple&url=" + OAuth.UrlEncode(link);
using (var client = new WebClient())
{
var shortUrl = client.DownloadString(url);
return(shortUrl);
}
}
private async static Task <string> WebRequest(string url, IEnumerable <string[]> parameters, bool post = false)
{
var oauth = new OAuth();
var nonce = OAuth.Nonce();
var timestamp = OAuth.TimeStamp();
var signature = OAuth.Signature(post ? "POST" : "GET", url, nonce, timestamp, oauth.AccessToken, oauth.AccessTokenSecret, parameters);
var authorizeHeader = OAuth.AuthorizationHeader(nonce, timestamp, oauth.AccessToken, signature);
var parameterStrings = parameters.Select(p => string.Format("{0}={1}", OAuth.UrlEncode(p[0]), OAuth.UrlEncode(p[1]))).ToList();
if (!post)
{
url += "?" + string.Join("&", parameterStrings);
}
var request = WebRequestWrapper.Create(new Uri(url));
request.Headers.Add("Authorization", authorizeHeader);
request.Method = post ? "POST" : "GET";
if (post)
{
Trace.TraceInformation(string.Join("&", parameterStrings));
request.ContentType = "application/x-www-form-urlencoded";
if (parameters != null)
{
using (var requestStream = request.GetRequestStream())
{
WriteStream(requestStream, string.Join("&", parameterStrings));
}
}
}
using (var response = await request.GetResponseAsync())
{
using (var stream = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
var result = stream.ReadToEnd();
return(result);
}
}
}