private GetUserSettingsResponse GetUserSettings(string Mailbox, string startUrl = "")
{
// Attempt autodiscover, with maximum of 10 hops
// As per docs: https://docs.microsoft.com/en-us/dotnet/api/microsoft.exchange.webservices.autodiscover.autodiscoverservice.getusersettings?view=exchange-ews-api
Uri url = null;
GetUserSettingsResponse response = null;
if (!String.IsNullOrEmpty(startUrl))
{
url = new Uri(startUrl);
}
if (!_credentialHandler.ApplyCredentialsToAutodiscoverService(_autodiscover))
{
throw new Exception("Failed to apply credentials to Autodiscover service");
}
for (int attempt = 0; attempt < 10; attempt++)
{
if (url != null)
{
_autodiscover.Url = url;
}
_autodiscover.EnableScpLookup = false;// (attempt < 2);
response = _autodiscover.GetUserSettings(Mailbox, UserSettingName.InternalEwsUrl, UserSettingName.ExternalEwsUrl, UserSettingName.GroupingInformation);
if (response.ErrorCode == AutodiscoverErrorCode.RedirectAddress)
{
// Redirecting to different mail address (can occur in hybrid)
return(GetUserSettings(response.RedirectTarget));
}
else if (response.ErrorCode == AutodiscoverErrorCode.RedirectUrl)
{
// Redirecting to another AutoDiscover Url
url = new Uri(response.RedirectTarget);
}
else
{
_logger.Log($"Autodiscover Url: {_autodiscover.Url}");
return(response);
}
}
throw new Exception("No suitable Autodiscover endpoint was found.");
}
private void CreateAutodiscoverService()
{
_autodiscover = new AutodiscoverService(ExchangeVersion.Exchange2013); // Minimum version we need is 2013
_autodiscover.RedirectionUrlValidationCallback = RedirectionCallback;
if (_traceListener != null)
{
_autodiscover.TraceListener = _traceListener;
_autodiscover.TraceFlags = TraceFlags.All;
_autodiscover.TraceEnabled = true;
}
if (CredentialHandler != null)
{
_credentialHandler = CredentialHandler;
_credentialHandler.ApplyCredentialsToAutodiscoverService(_autodiscover);
}
}
