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using Xmpp;
using Xmpp.Xep;
namespace Xmpp.Xep.JingleInBandBytestreams {
private const string NS_URI = "urn:xmpp:jingle:transports:ibb:1";
private const int DEFAULT_BLOCKSIZE = 4096;
private const int MAX_BLOCKSIZE = 65535;
public class Module : Jingle.Transport, XmppStreamModule {
public static Xmpp.ModuleIdentity<Module> IDENTITY = new Xmpp.ModuleIdentity<Module>(NS_URI, "0261_jingle_in_band_bytestreams");
public override void attach(XmppStream stream) {
stream.get_module(Jingle.Module.IDENTITY).register_transport(this);
stream.get_module(ServiceDiscovery.Module.IDENTITY).add_feature(stream, NS_URI);
}
public override void detach(XmppStream stream) {
stream.get_module(ServiceDiscovery.Module.IDENTITY).remove_feature(stream, NS_URI);
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
public async bool is_transport_available(XmppStream stream, Jid full_jid) {
return yield stream.get_module(ServiceDiscovery.Module.IDENTITY).has_entity_feature(stream, full_jid, NS_URI);
}
public string transport_ns_uri() {
return NS_URI;
}
public Jingle.TransportType transport_type() {
return Jingle.TransportType.STREAMING;
}
public int transport_priority() {
return 0;
}
public Jingle.TransportParameters create_transport_parameters(XmppStream stream, Jid local_full_jid, Jid peer_full_jid) {
return new Parameters.create(peer_full_jid, random_uuid());
}
public Jingle.TransportParameters parse_transport_parameters(XmppStream stream, Jid local_full_jid, Jid peer_full_jid, StanzaNode transport) throws Jingle.IqError {
return Parameters.parse(peer_full_jid, transport);
}
}
class Parameters : Jingle.TransportParameters, Object {
public Jingle.Role role { get; private set; }
public Jid peer_full_jid { get; private set; }
public string sid { get; private set; }
public int block_size { get; private set; }
private Parameters(Jingle.Role role, Jid peer_full_jid, string sid, int block_size) {
this.role = role;
this.peer_full_jid = peer_full_jid;
this.sid = sid;
this.block_size = block_size;
}
public Parameters.create(Jid peer_full_jid, string sid) {
this(Jingle.Role.INITIATOR, peer_full_jid, sid, DEFAULT_BLOCKSIZE);
}
public static Parameters parse(Jid peer_full_jid, StanzaNode transport) throws Jingle.IqError {
string? sid = transport.get_attribute("sid");
int block_size = transport.get_attribute_int("block-size");
if (sid == null || block_size <= 0 || block_size > MAX_BLOCKSIZE) {
throw new Jingle.IqError.BAD_REQUEST("missing or invalid sid or blocksize");
}
return new Parameters(Jingle.Role.RESPONDER, peer_full_jid, sid, block_size);
}
public string transport_ns_uri() {
return NS_URI;
}
public StanzaNode to_transport_stanza_node() {
return new StanzaNode.build("transport", NS_URI)
.add_self_xmlns()
.put_attribute("block-size", block_size.to_string())
.put_attribute("sid", sid);
}
public void on_transport_accept(StanzaNode transport) throws Jingle.IqError {
Parameters other = Parameters.parse(peer_full_jid, transport);
if (other.sid != sid || other.block_size > block_size) {
throw new Jingle.IqError.NOT_ACCEPTABLE("invalid IBB sid or block_size");
}
block_size = other.block_size;
}
public void on_transport_info(StanzaNode transport) throws Jingle.IqError {
throw new Jingle.IqError.UNSUPPORTED_INFO("transport-info not supported for IBBs");
}
public void create_transport_connection(XmppStream stream, Jingle.Session session) {
session.set_transport_connection(stream, InBandBytestreams.Connection.create(stream, peer_full_jid, sid, block_size, role == Jingle.Role.INITIATOR));
}
}
}
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