public static string GetOAuthAccessTokenCore(IEnumerator <Uri> stsUris, Func <Uri, Uri> uriBuilder, string requestToken, TimeSpan timeout, out DateTime expiresIn, out string audience)
{
byte[] bytes = Encoding.UTF8.GetBytes(requestToken);
string end = null;
expiresIn = DateTime.MinValue;
audience = null;
bool flag = stsUris.MoveNext();
while (flag)
{
Uri uri = uriBuilder(stsUris.Current);
try
{
HttpWebRequest servicePointMaxIdleTimeMilliSeconds = WebRequest.Create(uri) as HttpWebRequest;
servicePointMaxIdleTimeMilliSeconds.ServicePoint.MaxIdleTime = Constants.ServicePointMaxIdleTimeMilliSeconds;
servicePointMaxIdleTimeMilliSeconds.AllowAutoRedirect = true;
servicePointMaxIdleTimeMilliSeconds.MaximumAutomaticRedirections = 1;
servicePointMaxIdleTimeMilliSeconds.Method = "POST";
servicePointMaxIdleTimeMilliSeconds.ContentType = "application/x-www-form-urlencoded";
servicePointMaxIdleTimeMilliSeconds.ContentLength = (long)((int)bytes.Length);
servicePointMaxIdleTimeMilliSeconds.Timeout = TokenProviderHelper.ConvertToInt32(timeout);
using (Stream requestStream = servicePointMaxIdleTimeMilliSeconds.GetRequestStream())
{
requestStream.Write(bytes, 0, (int)bytes.Length);
}
using (HttpWebResponse response = servicePointMaxIdleTimeMilliSeconds.GetResponse() as HttpWebResponse)
{
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8))
{
end = streamReader.ReadToEnd();
TokenProviderHelper.ExtractExpiresInAndAudience(end, out expiresIn, out audience);
}
}
}
flag = false;
}
catch (ArgumentException argumentException)
{
TokenProviderHelper.ThrowException(uri, argumentException);
}
catch (WebException webException1)
{
WebException webException = webException1;
flag = stsUris.MoveNext();
if (!flag)
{
TokenProviderHelper.ThrowException(uri, webException);
}
}
}
return(end);
}
