/// <summary>
/// Request template for URL
/// </summary>
/// <param name="eService"></param>
/// <returns></returns>
private static string GetRequestTemplate(ShortURLProvider eService)
{
string strRequest = string.Empty;
switch (eService)
{
case ShortURLProvider.Isgd:
strRequest = "http://is.gd/api.php?longurl={0}";
break;
case ShortURLProvider.Bitly:
strRequest = "http://bit.ly/api?url={0}";;
break;
case ShortURLProvider.Tinyurl:
strRequest = "http://tinyurl.com/api-create.php?url={0}";
break;
case ShortURLProvider.Trim:
strRequest = "http://tr.im/api/trim_url.xml?url={0}";
break;
default:
break;
}
return(strRequest);
}
/// <summary>
/// try to use different services to shorten the given url
/// </summary>
/// <param name="url"></param>
/// <param name="eService"></param>
/// <returns></returns>
public static string DoShortenURL(string url, ShortURLProvider eService)
{
// return empty strings if not valid
if (!IsValidURL(url))
return string.Empty;
string requestUrl = string.Format(GetRequestTemplate(eService), url);
WebRequest request = HttpWebRequest.Create(requestUrl);
request.Proxy = null;
string strResult = null;
try
{
using (Stream responseStream = request.GetResponse().GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.ASCII);
strResult = reader.ReadToEnd();
if (!IsValidURL(strResult))
return string.Empty;
}
}
catch (Exception)
{
strResult = url;
}
// if converted is longer than original, return original
if (strResult.Length > url.Length)
strResult = url;
//if the previous service didn't work, try Tr.im:
if (strResult.CompareTo(url) == 0)
strResult = GetShortURLbyXML(url);
return strResult;
}
/// <summary>
/// try to use different services to shorten the given url
/// </summary>
/// <param name="url"></param>
/// <param name="eService"></param>
/// <returns></returns>
public static string DoShortenURL(string url, ShortURLProvider eService)
{
// return empty strings if not valid
if (!IsValidURL(url))
{
return(string.Empty);
}
string requestUrl = string.Format(GetRequestTemplate(eService), url);
WebRequest request = HttpWebRequest.Create(requestUrl);
request.Proxy = null;
string strResult = null;
try
{
using (Stream responseStream = request.GetResponse().GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.ASCII);
strResult = reader.ReadToEnd();
if (!IsValidURL(strResult))
{
return(string.Empty);
}
}
}
catch (Exception)
{
strResult = url;
}
// if converted is longer than original, return original
if (strResult.Length > url.Length)
{
strResult = url;
}
//if the previous service didn't work, try Tr.im:
if (strResult.CompareTo(url) == 0)
{
strResult = GetShortURLbyXML(url);
}
return(strResult);
}
/* Request template for URL */
private static string GetRequestTemplate(ShortURLProvider eService)
{
string strRequest = null;
switch (eService)
{
case ShortURLProvider.Isgd:
strRequest = "http://is.gd/api.php?longurl={0}";
break;
case ShortURLProvider.Bitly:
strRequest = "http://bit.ly/api?url={0}"; ;
break;
case ShortURLProvider.Tinyurl:
strRequest = "http://tinyurl.com/api-create.php?url={0}";
break;
default:
break;
}
return strRequest;
}
//public static string randomizeShortURLProvider()
//{
// string[] providers = {"Tinyurl", "Bitly", "Isgd"};
// Random rnd = new Random();
// string random = string.Empty;
// for (int i = 0; i <= 3; i++)
// {
// random = providers[rnd.Next(0, 3)].ToString();
// }
// return random;
//}
public static string ShortenURL(string strUrl, ShortURLProvider eService)
{
// return empty strings if not valid
if (!IsValidURL(strUrl))
{
return "";
}
string requestUrl = string.Format(GetRequestTemplate(eService), strUrl);
WebRequest request = HttpWebRequest.Create(requestUrl);
request.Proxy = null;
string strResult = null;
try
{
using (Stream responseStream = request.GetResponse().GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.ASCII);
strResult = reader.ReadToEnd();
if (!IsValidURL(strResult))
{
WebException w = new WebException(strResult);
throw w;
}
}
}
catch (Exception)
{
return strUrl; // eat it and return original url
}
// if converted is longer than original, return original
if (strResult.Length > strUrl.Length)
strResult = strUrl;
return strResult;
}
