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using Xmpp.Core;
namespace Xmpp.Xep.StreamManagement {
public const string NS_URI = "urn:xmpp:sm:3";
public class Module : XmppStreamNegotiationModule {
public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, "0198_stream_management");
public int h_inbound { get; private set; default=0; }
public string? session_id { get; set; default=null; }
public Gee.List<XmppStreamFlag> flags = null;
public override void attach(XmppStream stream) {
stream.get_module(Bind.Module.IDENTITY).bound_to_resource.connect(check_enable);
stream.received_features_node.connect(check_resume);
stream.received_nonza.connect(on_received_nonza);
stream.received_message_stanza.connect(on_stanza_received);
stream.received_presence_stanza.connect(on_stanza_received);
stream.received_iq_stanza.connect(on_stanza_received);
}
public override void detach(XmppStream stream) { }
public static void require(XmppStream stream) {
if (stream.get_module(IDENTITY) == null) stream.add_module(new PrivateXmlStorage.Module());
}
public override bool mandatory_outstanding(XmppStream stream) { return false; }
public override bool negotiation_active(XmppStream stream) {
return stream.has_flag(Flag.IDENTITY) && !stream.get_flag(Flag.IDENTITY).finished;
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
private void on_stanza_received(XmppStream stream, StanzaNode node) {
lock (h_inbound) h_inbound++;
}
private void check_resume(XmppStream stream) {
if (stream_has_sm_feature(stream) && session_id != null) {
Tls.Flag? tls_flag = stream.get_flag(Tls.Flag.IDENTITY);
if (tls_flag != null && tls_flag.finished) {
StanzaNode node = new StanzaNode.build("resume", NS_URI).add_self_xmlns()
.put_attribute("h", h_inbound.to_string())
.put_attribute("previd", session_id);
stream.write(node);
stream.add_flag(new Flag());
}
}
}
private void check_enable(XmppStream stream) {
if (stream_has_sm_feature(stream) && session_id == null) {
StanzaNode node = new StanzaNode.build("enable", NS_URI).add_self_xmlns().put_attribute("resume", "true");
stream.write(node);
stream.add_flag(new Flag());
}
}
private void on_received_nonza(XmppStream stream, StanzaNode node) {
if (node.ns_uri == NS_URI) {
if (node.name == "r") {
send_ack(stream);
} else if (node.name == "a") {
handle_ack(stream, node);
} else if (node.name in new string[]{"enabled", "resumed", "failed"}) {
stream.get_flag(Flag.IDENTITY).finished = true;
if (node.name == "enabled") {
lock(h_inbound) h_inbound = 0;
session_id = node.get_attribute("id", NS_URI);
flags = stream.flags;
} else if (node.name == "resumed") {
foreach (XmppStreamFlag flag in flags) {
stream.add_flag(flag);
}
stream.negotiation_complete = true;
} else if (node.name == "failed") {
stream.received_features_node(stream);
session_id = null;
}
}
}
}
private void send_ack(XmppStream stream) {
StanzaNode node = new StanzaNode.build("a", NS_URI).add_self_xmlns().put_attribute("h", h_inbound.to_string());
stream.write(node);
}
private void handle_ack(XmppStream stream, StanzaNode node) {
}
private bool stream_has_sm_feature(XmppStream stream) {
return stream.features.get_subnode("sm", NS_URI) != null;
}
}
public class Flag : XmppStreamFlag {
public static FlagIdentity<Flag> IDENTITY = new FlagIdentity<Flag>(NS_URI, "stream_management");
public bool finished = false;
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
}
}
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