CollectionSync(string syncTokenOrNull, IGetVersionsLogger logger)
{
try
{
var document = await _webDavClient.ExecuteWebDavRequestAndReadResponse(
_serverUrl,
"REPORT",
0,
null,
null,
"application/xml",
$@"<?xml version=""1.0"" encoding=""utf-8"" ?>
<D:sync-collection xmlns:D=""DAV:"">
{(syncTokenOrNull != null ? $"<D:sync-token>{syncTokenOrNull}</D:sync-token>" : "<D:sync-token/>")}
<D:sync-level>1</D:sync-level>
<D:prop>
<D:getetag/>
</D:prop>
</D:sync-collection>
");
var syncTokenNode = document.XmlDocument.SelectSingleNode("/D:multistatus/D:sync-token", document.XmlNamespaceManager) ?? throw new Exception("Sync token missing");
var extractedItems = ExtractCollectionItems(document, logger);
return(syncTokenNode.InnerText, extractedItems.ChangedOrAddedItems, extractedItems.DeletedItems);
}
catch (WebDavClientException x) when(x.StatusCode == HttpStatusCode.Forbidden && syncTokenOrNull != null)
{
var isSyncTokenInvalid = false;
try
{
var xmlDocument = new XmlDocument();
xmlDocument.LoadXml(x.ResponseMessage);
var document = WebDavClientBase.CreateXmlDocumentWithNamespaceManager(_serverUrl, xmlDocument);
isSyncTokenInvalid = document.XmlDocument.SelectSingleNode("/D:error/D:valid-sync-token", document.XmlNamespaceManager) != null;
}
catch (Exception xt)
{
s_logger.Info("Error while trying to Check response for invalid token message", xt);
}
if (isSyncTokenInvalid)
{
s_logger.Info("Detected invalid sync-token. Retrying CollectionSync.");
return(await CollectionSync(null, logger));
}
else
{
throw;
}
}
}
