public async Task <OAuthToken> RedeemAuthorizationCodeAsync(string authCode)
{
var queryBuilder = new QueryStringBuilder {
StartCharacter = null
};
queryBuilder.Add("grant_type", "authorization_code");
queryBuilder.Add("code", authCode);
queryBuilder.Add("client_id", this.ClientId);
if (!string.IsNullOrEmpty(this.RedirectUri))
{
queryBuilder.Add("redirect_uri", this.RedirectUri);
}
if (!string.IsNullOrEmpty(this.ClientSecret))
{
queryBuilder.Add("client_secret", this.ClientSecret);
}
return(await PostToTokenEndPoint(queryBuilder));
}
public async Task <OAuthToken> RedeemRefreshTokenAsync(string refreshToken)
{
var queryBuilder = new QueryStringBuilder {
StartCharacter = null
};
queryBuilder.Add("grant_type", "refresh_token");
queryBuilder.Add("refresh_token", refreshToken);
queryBuilder.Add("client_id", this.ClientId);
if (!string.IsNullOrEmpty(this.RedirectUri))
{
queryBuilder.Add("redirect_uri", this.RedirectUri);
}
if (!string.IsNullOrEmpty(this.ClientSecret))
{
queryBuilder.Add("client_secret", this.ClientSecret);
}
return(await PostToTokenEndPoint(queryBuilder));
}
private async Task <OAuthToken> PostToTokenEndPoint(QueryStringBuilder queryBuilder)
{
HttpWebRequest request = WebRequest.CreateHttp(this.TokenService);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
using (StreamWriter requestWriter = new StreamWriter(await request.GetRequestStreamAsync()))
{
await requestWriter.WriteAsync(queryBuilder.ToString());
await requestWriter.FlushAsync();
}
HttpWebResponse httpResponse;
try
{
var response = await request.GetResponseAsync();
httpResponse = response as HttpWebResponse;
}
catch (WebException webex)
{
httpResponse = webex.Response as HttpWebResponse;
}
catch (Exception)
{
return(null);
}
if (httpResponse == null)
{
return(null);
}
try
{
if (httpResponse.StatusCode != HttpStatusCode.OK)
{
return(null);
}
using (var responseBodyStreamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var responseBody = await responseBodyStreamReader.ReadToEndAsync();
var tokenResult = Newtonsoft.Json.JsonConvert.DeserializeObject <OAuthToken>(responseBody);
httpResponse.Dispose();
return(tokenResult);
}
}
catch (Exception)
{
return(null);
}
finally
{
httpResponse.Dispose();
}
}