using Xmpp.Core; namespace Xmpp.Xep.MessageCarbons { private const string NS_URI = "urn:xmpp:carbons:2"; public class Module : XmppStreamModule { public const string ID = "0280_message_carbons_module"; public static ModuleIdentity IDENTITY = new ModuleIdentity(NS_URI, ID); public void enable(XmppStream stream) { Iq.Stanza iq = new Iq.Stanza.set(new StanzaNode.build("enable", NS_URI).add_self_xmlns()); Iq.Module.get_module(stream).send_iq(stream, iq); } public void disable(XmppStream stream) { Iq.Stanza iq = new Iq.Stanza.set(new StanzaNode.build("disable", NS_URI).add_self_xmlns()); Iq.Module.get_module(stream).send_iq(stream, iq); } public override void attach(XmppStream stream) { Bind.Module.require(stream); Iq.Module.require(stream); Message.Module.require(stream); ServiceDiscovery.Module.require(stream); stream.stream_negotiated.connect(enable); Message.Module.get_module(stream).pre_received_message.connect(pre_received_message); ServiceDiscovery.Module.get_module(stream).add_feature(stream, NS_URI); } public override void detach(XmppStream stream) { stream.stream_negotiated.disconnect(enable); Message.Module.get_module(stream).pre_received_message.disconnect(pre_received_message); } public static Module? get_module(XmppStream stream) { return (Module?) stream.get_module(IDENTITY); } public static void require(XmppStream stream) { if (get_module(stream) == null) stream.add_module(new Module()); } public override string get_ns() { return NS_URI; } public override string get_id() { return ID; } private void pre_received_message(XmppStream stream, Message.Stanza message) { StanzaNode? received_node = message.stanza.get_subnode("received", NS_URI); StanzaNode? sent_node = received_node == null ? message.stanza.get_subnode("sent", NS_URI) : null; StanzaNode? carbons_node = received_node != null ? received_node : sent_node; if (carbons_node != null) { StanzaNode? forwarded_node = carbons_node.get_subnode("forwarded", "urn:xmpp:forward:0"); if (forwarded_node != null) { StanzaNode? message_node = forwarded_node.get_subnode("message", Message.NS_URI); string? from_attribute = message_node.get_attribute("from", Message.NS_URI); // The security model assumed by this document is that all of the resources for a single user are in the same trust boundary. // Any forwarded copies received by a Carbons-enabled client MUST be from that user's bare JID; any copies that do not meet this requirement MUST be ignored. if (from_attribute != null && from_attribute == get_bare_jid(Bind.Flag.get_flag(stream).my_jid)) { if (received_node != null) { message.add_flag(new MessageFlag(MessageFlag.TYPE_RECEIVED)); } else if (sent_node != null) { message.add_flag(new MessageFlag(MessageFlag.TYPE_SENT)); } message.stanza = message_node; message.rerun_parsing = true; } message.stanza = message_node; message.rerun_parsing = true; } } } } public class MessageFlag : Message.MessageFlag { public const string id = "message_carbons"; public const string TYPE_RECEIVED = "received"; public const string TYPE_SENT = "sent"; private string type_; public MessageFlag(string type) { this.type_ = type; } public static MessageFlag? get_flag(Message.Stanza message) { return (MessageFlag) message.get_flag(NS_URI, id); } public override string get_ns() { return NS_URI; } public override string get_id() { return id; } } }