void HandleSubscribe(StanzaIQ Request)
{
XElement SubscribeElement = Request.Payload.Elements().First();
try
{
string AccessToken = LWTSD.GetAccessToken(SubscribeElement);
List <ResourceAccess> LimitedAccess = GetAccessRights(Request.From, AccessToken);
Subscriber Subscription = new Subscriber();
Subscription.SubscriptionID = SubscribeElement.Attribute("subscriptionid").Value;
Subscription.SubscriberAddress = Request.From;
Subscription.AccessToken = AccessToken;
foreach (XElement WriteElement in SubscribeElement.Elements(LWTSD.Namespace + "trigger"))
{
ResourcePath Path = WriteElement.Attribute("onresource").Value;
if (!ResourceAccess.AllowsRead(LimitedAccess, Path))
{
throw new AccessViolation();
}
if (!Resources.ContainsKey(Path))
{
throw new InvalidOperationException("Path does not exist: " + Path); // todo: explicit type to make it possible to set correct error code
}
Resource Res = Resources[Path];
if (!Res.SupportsRead)
{
throw new InvalidOperationException("Resource is not readable: " + Path); // todo: explicit type to make it possible to set correct error code
}
ResourceSubscription Trigger = new ResourceSubscription()
{
Path = Path
};
Subscription.Triggers.Add(Trigger);
}
if (Subscription.Triggers.Count == 0)
{
throw new InvalidOperationException("No triggers");
}
Subscribers[GetSafeSubscriptionID(Request.From, Subscription.SubscriptionID)] = Subscription;
StanzaIQ Response = new StanzaIQ(StanzaIQ.StanzaIQType.Result);
Response.ID = Request.ID;
Response.To = Request.From;
Uplink.SendStanza(Response);
}
catch (System.Exception ex)
{
StanzaIQ ErrorResponse = new StanzaIQ(StanzaIQ.StanzaIQType.Error);
ErrorResponse.ID = Request.ID;
ErrorResponse.To = Request.From;
XElement ErroReasonElement = new XElement(LWTSD.Namespace + "errorreason");
ErroReasonElement.SetAttributeValue("reason", ErrorReason.InvalidData);
ErroReasonElement.Value = ex.ToString();
ErrorResponse.Payload.Add(ErroReasonElement);
Uplink.SendStanza(ErrorResponse);
}
}
public void RemoveResource(ResourcePath Path)
{
// todo: if a resource is removed; invalidate subscribers and remove any subscription
throw new NotImplementedException();
}
void HandleReadData(StanzaIQ Request)
{
XElement ReadDataElement = Request.Payload.Elements().First();
try
{
List <ResourceAccess> LimitedAccess = GetAccessRights(Request.From, LWTSD.GetAccessToken(ReadDataElement));
int maxpoints = XmlConvert.ToInt32(ReadDataElement.Attribute("maxpoints").Value);
int startindex = XmlConvert.ToInt32(ReadDataElement.Attribute("startindex").Value);
SortOrder OrderByTime = SortOrder.None;
if (ReadDataElement.Attribute("orderedbytime") != null)
{
OrderByTime = SortOrderMethods.LoadFromString(ReadDataElement.Attribute("orderedbytime").Value);
}
StanzaIQ Response = new StanzaIQ(StanzaIQ.StanzaIQType.Result);
Response.ID = Request.ID;
Response.To = Request.From;
XElement DataElement = new XElement(LWTSD.Namespace + "data");
List <Resource> MatchingResources = new List <Resource>();
foreach (XElement ReadElement in ReadDataElement.Elements(LWTSD.Namespace + "read"))
{
if (ReadElement.Attribute("maxpoints") != null)
{
if (XmlConvert.ToInt32(ReadElement.Attribute("maxpoints").Value) < 1)
{
throw new InvalidOperationException("Maxpoints < 0 in read");
}
}
if (ReadElement.Attribute("startindex") != null)
{
int localstartindex = XmlConvert.ToInt32(ReadElement.Attribute("startindex").Value);
if (localstartindex < 1)
{
throw new InvalidOperationException("startindex < 0 in read");
}
if (localstartindex > 1)
{
continue; // We only have one point / resource
}
}
ResourcePath Path = ReadElement.Attribute("resource-path").Value;
if (!ResourceAccess.AllowsRead(LimitedAccess, Path))
{
throw new AccessViolation();
}
if (!Resources.ContainsKey(Path))
{
// Todo: Explicit exception to set proper error code
throw new Exception("Path does not exist: " + Path);
}
Resource Res = Resources[Path];
if (!Res.SupportsRead)
{
throw new InvalidOperationException("Resource does not support read: " + Path);
}
MatchingResources.Add(Res);
}
lock (Schema)
{
int Index = 0;
int ReturnedPoints = 0;
foreach (Resource Res in MatchingResources)
{
if (Index < startindex)
{
Index++;
continue;
}
if ((Index - startindex) >= maxpoints)
{
Index++;
break;
}
Index++;
ReturnedPoints++;
XElement ResourceElement = new XElement(LWTSD.Namespace + "resource");
ResourceElement.SetAttributeValue("path", Res.Path);
ResourceElement.SetAttributeValue("returnedpoints", "1");
ResourceElement.SetAttributeValue("totalpoints", "1");
XElement PointElement = Res.GetPoint();
ResourceElement.Add(PointElement);
DataElement.Add(ResourceElement);
}
DataElement.SetAttributeValue("schemaversion", Schema.GetVersion());
DataElement.SetAttributeValue("returnedpoints", XmlConvert.ToString(ReturnedPoints));
DataElement.SetAttributeValue("totalpoints", XmlConvert.ToString(MatchingResources.Count));
}
foreach (XElement ReSubscribeElement in ReadDataElement.Elements(LWTSD.Namespace + "re-subscribe"))
{
string localsid = ReSubscribeElement.Attribute("subscriptionid").Value;
string sid = GetSafeSubscriptionID(Request.From, localsid);
if (!Subscribers.ContainsKey(sid))
{
throw new InvalidOperationException("Subscription ID does not exist: " + localsid);
}
Subscriber Subscription = Subscribers[sid];
Subscription.LastResubscribed = DateTime.UtcNow;
}
Response.Payload.Add(DataElement);
Uplink.SendStanza(Response);
}
catch (System.Exception ex)
{
StanzaIQ ErrorResponse = new StanzaIQ(StanzaIQ.StanzaIQType.Error);
ErrorResponse.ID = Request.ID;
ErrorResponse.To = Request.From;
XElement ErroReasonElement = new XElement(LWTSD.Namespace + "errorreason");
ErroReasonElement.SetAttributeValue("reason", ErrorReason.InvalidData);
ErroReasonElement.Value = ex.ToString();
ErrorResponse.Payload.Add(ErroReasonElement);
Uplink.SendStanza(ErrorResponse);
}
}