////////////////////////////////////////////////////////////////////
// Load Program State
////////////////////////////////////////////////////////////////////
/// <summary>
/// Load Program State
/// </summary>
/// <param name="fileName">Refresh token file name</param>
/// <returns>Refresh token class</returns>
public static SecureSmtpRefreshToken LoadState(string fileName)
{
// program state file does not exist
if (!File.Exists(fileName))
{
return(null);
}
XmlTextReader textFile = null;
SecureSmtpRefreshToken state = null;
try
{
// read program state file
textFile = new XmlTextReader(fileName);
// create xml serializing object
var xmlFile = new XmlSerializer(typeof(SecureSmtpRefreshToken));
// deserialize the program state
state = (SecureSmtpRefreshToken)xmlFile.Deserialize(textFile);
}
catch
{
state = null;
}
// close the file
textFile?.Close();
// exit
return(state);
}
/// <summary>
/// Secure SMTP OAuth2 constructor
/// </summary>
/// <param name="refreshTokenFileName">Refresh token file name</param>
public SecureSmtpOAuth2(string refreshTokenFileName)
{
// no file name
if (string.IsNullOrWhiteSpace(refreshTokenFileName))
{
throw new ApplicationException("Refresh token file name is missing or empty");
}
// look for refresh token
_refreshToken = SecureSmtpRefreshToken.LoadState(refreshTokenFileName);
if (_refreshToken == null)
{
throw new ApplicationException("SecureSmtpRefreshToken.xml file is missing or invalid");
}
return;
}