private Task<Stream> MakeRequest(string uri, AdmAccessToken authToken)
{
var task = new TaskCompletionSource<Stream>();
if (authToken == null)
{
task.SetException(new TranslationException(new NullReferenceException("authToken")));
return task.Task;
}
var httpWebRequest = (HttpWebRequest)WebRequest.Create(uri);
httpWebRequest.Headers["Authorization"] = "Bearer " + authToken.access_token;
IAsyncResult ar = null;
ar = httpWebRequest.BeginGetResponse(delegate
{
try
{
Stream stream = httpWebRequest.EndGetResponse(ar).GetResponseStream();
task.SetResult(stream);
}
catch (Exception e)
{
task.SetException(new TranslationException(e));
}
}, null);
return task.Task;
}
public async Task <List <string> > GetLanguages()
{
AdmAccessToken authToken = await GetAccessToken();
string uri = string.Format("http://api.microsofttranslator.com/V2/Http.svc/GetLanguagesForTranslate");
using (Stream stream = await MakeRequest(uri, authToken))
{
var serializer = new DataContractSerializer(typeof(string[]));
var translationLangs = (string[])serializer.ReadObject(stream);
return(translationLangs.ToList());
}
}
public async Task <string> Translate(string text, string toLang)
{
AdmAccessToken authToken = await GetAccessToken();
string uri = string.Format("http://api.microsofttranslator.com/v2/Http.svc/Translate?text={0}&to={1}&contentType={2}", text, toLang, "text/plain");
using (Stream stream = await MakeRequest(uri, authToken))
{
var serializer = new DataContractSerializer(typeof(String));
var translation = (string)serializer.ReadObject(stream);
return(translation);
}
}
private async void OnTokenExpiredCallback(object stateInfo)
{
try
{
await RequestNewToken();
}
catch (Exception ex)
{
_token = null;
}
finally
{
_renewTimer.Change(TimeSpan.FromMinutes(RefreshTokenDuration), TimeSpan.FromMilliseconds(-1));
}
}
private async void OnTokenExpiredCallback(object stateInfo)
{
try
{
await RequestNewToken();
}
catch (Exception ex)
{
_token = null;
}
finally
{
_renewTimer.Change(TimeSpan.FromMinutes(RefreshTokenDuration), TimeSpan.FromMilliseconds(-1));
}
}
private async Task RequestNewToken()
{
const string datamarketAccessUri = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13";
var requestData = string.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope=http://api.microsofttranslator.com",
HttpUtility.UrlEncode(_clientId),
HttpUtility.UrlEncode(_clientSecret));
byte[] bytes = Encoding.UTF8.GetBytes(requestData);
var http = new HttpClient();
var content = new ByteArrayContent(bytes);
HttpResponseMessage response = await http.PostAsync(datamarketAccessUri, content);
using (Stream responseStream = await response.Content.ReadAsStreamAsync())
{
var serializer = new DataContractJsonSerializer(typeof(AdmAccessToken));
_token = (AdmAccessToken)serializer.ReadObject(responseStream);
_lastTokenTimestamp = DateTime.Now;
}
}
private async Task RequestNewToken()
{
const string datamarketAccessUri = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13";
var requestData = string.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope=http://api.microsofttranslator.com",
HttpUtility.UrlEncode(_clientId),
HttpUtility.UrlEncode(_clientSecret));
byte[] bytes = Encoding.UTF8.GetBytes(requestData);
var http = new HttpClient();
var content = new ByteArrayContent(bytes);
HttpResponseMessage response = await http.PostAsync(datamarketAccessUri, content);
using (Stream responseStream = await response.Content.ReadAsStreamAsync())
{
var serializer = new DataContractJsonSerializer(typeof (AdmAccessToken));
_token = (AdmAccessToken)serializer.ReadObject(responseStream);
_lastTokenTimestamp = DateTime.Now;
}
}
