public override void Execute()
{
try
{
base.Execute();
}
catch (GDataRequestException re)
{
HttpWebResponse webResponse = re.Response as HttpWebResponse;
if (webResponse != null && webResponse.StatusCode == HttpStatusCode.Unauthorized)
{
Tracing.TraceMsg("Access token might have expired, refreshing.");
Reset();
try
{
OAuthUtil.RefreshAccessToken(_factory.Parameters);
}
catch (WebException e)
{
Tracing.TraceMsg("Failed to refresh access token: " + e.StackTrace);
throw re;
}
base.Execute();
}
else
{
throw;
}
}
}
/// <summary>
/// Takes an existing httpwebrequest and modifies its headers according to
/// the authentication system used.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public override void ApplyAuthenticationToRequest(HttpWebRequest request)
{
base.ApplyAuthenticationToRequest(request);
string oauthHeader = OAuthUtil.GenerateHeader(
request.RequestUri,
request.Method,
_parameters);
request.Headers.Add(oauthHeader);
}
/// <summary>
/// Takes an existing httpwebrequest and modifies its headers according to
/// the authentication system used.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public override void ApplyAuthenticationToRequest(HttpWebRequest request)
{
base.ApplyAuthenticationToRequest(request);
if (!string.IsNullOrEmpty(_parameters.AccessCode) && string.IsNullOrEmpty(_parameters.AccessToken))
{
OAuthUtil.GetAccessToken(_parameters);
}
request.Headers.Set("Authorization", String.Format(
"{0} {1}", _parameters.TokenType, _parameters.AccessToken));
}
/// <summary>
/// sets up the correct credentials for this call.
/// </summary>
protected override void EnsureCredentials()
{
HttpWebRequest http = Request as HttpWebRequest;
if (string.IsNullOrEmpty(_factory.ConsumerKey) || string.IsNullOrEmpty(_factory.ConsumerSecret))
{
throw new GDataRequestException("ConsumerKey and ConsumerSecret must be provided to use GOAuthRequestFactory");
}
string oauthHeader = OAuthUtil.GenerateHeader(
http.RequestUri,
_factory.ConsumerKey,
_factory.ConsumerSecret,
_factory.Token,
_factory.TokenSecret,
http.Method);
Request.Headers.Remove("Authorization"); // needed?
Request.Headers.Add(oauthHeader);
}
