private void RenewAccessToken()
{
AccessTokenInfo newAccessToken = HttpPost(AccessUri, this.request);
//swap the new token with old one
//Note: the swap is thread unsafe
this.token = newAccessToken;
Console.WriteLine(string.Format("Renewed token for user: {0} is: {1}",
this.clientId,
this.token.access_token));
}
public TTSpeech(string text, string lang)
{
this.Text = text;
this.Lang = lang;
try
{
if (_token == null || _tokenGenTime.AddMinutes(10) < DateTime.UtcNow)
{
Authentication auth = new Authentication(_speechAccount, _speechKey);
_token = auth.GetAccessToken();
_tokenGenTime = DateTime.UtcNow;
}
}
catch (Exception)
{
throw;
}
}
public Authentication(string clientId, string clientSecret)
{
this.clientId = clientId;
this.clientSecret = clientSecret;
// If clientid or client secret has special characters, encode before sending request
this.request = string.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope={2}",
HttpUtility.UrlEncode(clientId),
HttpUtility.UrlEncode(clientSecret),
HttpUtility.UrlEncode("https://speech.platform.bing.com"));
this.token = HttpPost(AccessUri, this.request);
// renew the token every specfied minutes
accessTokenRenewer = new Timer(new TimerCallback(OnTokenExpiredCallback),
this,
TimeSpan.FromMinutes(RefreshTokenDuration),
TimeSpan.FromMilliseconds(-1));
}
private AccessTokenInfo HttpPost(string accessUri, string requestDetails)
{
//Prepare OAuth request
WebRequest webRequest = WebRequest.Create(accessUri);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Method = "POST";
byte[] bytes = Encoding.ASCII.GetBytes(requestDetails);
webRequest.ContentLength = bytes.Length;
using (Stream outputStream = webRequest.GetRequestStream())
{
outputStream.Write(bytes, 0, bytes.Length);
}
using (WebResponse webResponse = webRequest.GetResponse())
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(AccessTokenInfo));
//Get deserialized object from JSON stream
AccessTokenInfo token = (AccessTokenInfo)serializer.ReadObject(webResponse.GetResponseStream());
return(token);
}
}