/// <summary>
/// Fetch a page of archived messages
/// </summary>
/// <param name="pageRequest">Paging options</param>
/// <param name="with">Optional filter to only return messages if they match the supplied JID</param>
/// <param name="roomId">Optional filter to only return messages if they match the supplied JID</param>
/// <param name="start">Optional filter to only return messages whose timestamp is equal to or later than the given timestamp.</param>
/// <param name="end">Optional filter to only return messages whose timestamp is equal to or earlier than the timestamp given in the 'end' field.</param>
internal Task <XmppPage <Message> > GetArchivedMessages(XmppPageRequest pageRequest, Jid with = null, Jid roomId = null, DateTimeOffset?start = null, DateTimeOffset?end = null)
{
string queryId = Guid.NewGuid().ToString().Replace("-", "");
var request = Xml.Element("query", xmlns)
.Attr("queryid", queryId)
.Child(pageRequest.ToXmlElement());
if (with != null || start != null || end != null)
{
var filterForm = new SubmitForm();
filterForm.AddValue("FORM_TYPE", DataFieldType.Hidden, xmlns);
if (with != null)
{
filterForm.AddUntypedValue("with", with);
}
if (start != null)
{
filterForm.AddUntypedValue("start", DateTimeProfiles.ToXmppDateTimeString(start.Value));
}
if (end != null)
{
filterForm.AddUntypedValue("end", DateTimeProfiles.ToXmppDateTimeString(end.Value));
}
request.Child(filterForm.ToXmlElement());
}
var tcs = new TaskCompletionSource <XmppPage <Message> >();
var queryTask = pendingQueries[queryId] = new ArchiveQueryTask(tcs);
var response = IM.IqRequest(Sharp.Xmpp.Core.IqType.Set, roomId, null, request);
if (response.Type == Core.IqType.Error)
{
queryTask.SetException(Util.ExceptionFromError(response, "Failed to get archived messages"));
}
return(tcs.Task);
}
