private static AccessToken GetAccessToken(string clientID, string clientSecret)
{
if (string.IsNullOrEmpty(clientID) && string.IsNullOrEmpty(clientSecret))
{
throw new Exception("To enable Bing translation you have to specify the Client ID and the Client Secret in the options.");
}
if (string.IsNullOrEmpty(clientID) || string.IsNullOrEmpty(clientSecret))
{
throw new Exception("To enable Bing translation you have to specify both the Client ID and the Client Secret in the options.");
}
string key = string.Format("{0}\x01{1}", clientID, clientSecret);
if (BingTranslator._loadedTokens.ContainsKey(key) && !BingTranslator._loadedTokens[key].Expired)
{
return(BingTranslator._loadedTokens[key]);
}
else
{
Dictionary <string, string> fields = new Dictionary <string, string>();
fields.Add("grant_type", "client_credentials");
fields.Add("client_id", clientID);
fields.Add("client_secret", clientSecret);
fields.Add("scope", "http://api.microsofttranslator.com");
StringBuilder f = null;
foreach (KeyValuePair <string, string> kv in fields)
{
if (f == null)
{
f = new StringBuilder();
}
else
{
f.Append('&');
}
f.Append(HttpUtility.UrlEncode(kv.Key)).Append('=').Append(HttpUtility.UrlEncode(kv.Value));
}
WebRequest request = WebRequest.Create("https://datamarket.accesscontrol.windows.net/v2/OAuth2-13");
request.ContentType = "application/x-www-form-urlencoded";
request.Method = WebRequestMethods.Http.Post;
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(f.ToString());
request.ContentLength = bytes.Length;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(bytes, 0, bytes.Length);
}
WebResponse response = null;
try
{
Exception error;
try
{
response = request.GetResponse();
error = null;
}
catch (WebException x)
{
response = x.Response;
error = x;
}
string rs;
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream, Encoding.UTF8, false))
{
rs = reader.ReadToEnd();
}
}
if (error == null)
{
AccessToken result = new AccessToken(rs);
BingTranslator._loadedTokens.Add(key, result);
return(result);
}
else
{
ErrorResponseException er = ErrorResponseException.Parse(rs);
throw (er == null) ? error : er;
}
}
catch
{
throw;
}
finally
{
if (response != null)
{
try
{ response.Close(); }
catch
{ }
response = null;
}
}
}
}