public async Task <OneDriveChangeCollection> GetChanges(string accessToken, string path, string cursor)
{
CommonUtils.ValidateNullArgument("accessToken", accessToken);
CommonUtils.ValidateNullArgument("path", path);
var requestUri = GetRequestUri(path);
requestUri = await GetItemUri(accessToken, requestUri) + "/view.changes";
var result = new OneDriveChangeCollection();
using (var client = CreateHttpClient(accessToken))
{
var next = cursor;
var ids = new Dictionary <string, ItemInfo>();
Dictionary <string, object> changes = null;
var serializer = JsonUtils.CreateJsonSerializer();
do
{
var uri = requestUri;
if (!String.IsNullOrEmpty(next))
{
uri = String.Format("{0}?token={1}", requestUri, next);
}
using (var response = await client.GetAsync(uri))
{
changes = await ProcessResponse <Dictionary <string, object> >("GetChanges", response);
}
if (changes.ContainsKey("@changes.resync"))
{
if (String.IsNullOrEmpty(next))
{
throw new InvalidOperationException("Unable to sync OneDrive @changes.resync is " + changes["@changes.resync"]);
}
// resync
next = null;
changes["@changes.hasMoreChanges"] = true;
result = new OneDriveChangeCollection();
continue;
}
var items = serializer.ConvertToType <OneDriveItemCollection>(changes);
// changes
result.AddRange(GetChanges(items, ids));
// set next token
next = (string)changes["@changes.token"];
} while ((bool)changes["@changes.hasMoreChanges"]);
result.Cursor = next;
return(result);
}
}