/// <summary>
/// Adds the bewit to the query string of the specified HttpRequestMessage object and
/// returns the bewit string.
/// </summary>
internal string CreateBewitInternal(IRequestMessage request, DateTime utcNow, int lifeSeconds)
{
string appData = null;
if (options.NormalizationCallback != null)
appData = options.NormalizationCallback(request);
var bewit = new Bewit(request, options.CredentialsCallback(),
utcNow, lifeSeconds, appData, options.LocalTimeOffsetMillis);
string bewitString = bewit.ToBewitString();
string parameter = String.Format("{0}={1}", HawkConstants.Bewit, bewitString);
string queryString = request.Uri.Query;
queryString = String.IsNullOrWhiteSpace(queryString) ? parameter : queryString.Substring(1) + "&" + parameter;
request.QueryString = queryString;
return bewitString;
}
