mirror of https://github.com/TakeV-Lambda/dino.git
495 lines
19 KiB
Vala
495 lines
19 KiB
Vala
using Gee;
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using Xmpp.Xep;
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using Xmpp;
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namespace Xmpp.Xep.Jingle {
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private const string NS_URI = "urn:xmpp:jingle:1";
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private const string ERROR_NS_URI = "urn:xmpp:jingle:errors:1";
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public errordomain IqError {
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BAD_REQUEST,
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NOT_ACCEPTABLE,
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NOT_IMPLEMENTED,
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OUT_OF_ORDER,
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}
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void send_iq_error(IqError iq_error, XmppStream stream, Iq.Stanza iq) {
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ErrorStanza error;
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if (iq_error is IqError.BAD_REQUEST) {
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error = new ErrorStanza.bad_request(iq_error.message);
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} else if (iq_error is IqError.NOT_ACCEPTABLE) {
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error = new ErrorStanza.not_acceptable(iq_error.message);
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} else if (iq_error is IqError.NOT_IMPLEMENTED) {
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error = new ErrorStanza.feature_not_implemented(iq_error.message);
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} else if (iq_error is IqError.OUT_OF_ORDER) {
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StanzaNode out_of_order = new StanzaNode.build("out-of-order", ERROR_NS_URI).add_self_xmlns();
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error = new ErrorStanza.build(ErrorStanza.TYPE_MODIFY, ErrorStanza.CONDITION_UNEXPECTED_REQUEST, iq_error.message, out_of_order);
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} else {
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assert_not_reached();
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}
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.error(iq, error));
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}
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public errordomain Error {
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GENERAL,
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BAD_REQUEST,
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INVALID_PARAMETERS,
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UNSUPPORTED_TRANSPORT,
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NO_SHARED_PROTOCOLS,
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TRANSPORT_ERROR,
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}
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StanzaNode get_single_node_anyns(StanzaNode parent, string node_name) throws IqError {
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StanzaNode? result = null;
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foreach (StanzaNode child in parent.get_all_subnodes()) {
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if (child.name == node_name) {
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if (result != null) {
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throw new IqError.BAD_REQUEST(@"multiple $(node_name) nodes");
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}
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result = child;
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}
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}
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if (result == null) {
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throw new IqError.BAD_REQUEST(@"missing $(node_name) node");
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}
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return result;
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}
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public class Module : XmppStreamModule, Iq.Handler {
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public static Xmpp.ModuleIdentity<Module> IDENTITY = new Xmpp.ModuleIdentity<Module>(NS_URI, "0166_jingle");
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private HashMap<string, ContentType> content_types = new HashMap<string, ContentType>();
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private HashMap<string, Transport> transports = new HashMap<string, Transport>();
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public override void attach(XmppStream stream) {
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stream.add_flag(new Flag());
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stream.get_module(ServiceDiscovery.Module.IDENTITY).add_feature(stream, NS_URI);
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stream.get_module(Iq.Module.IDENTITY).register_for_namespace(NS_URI, this);
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}
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public override void detach(XmppStream stream) { }
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public void register_content_type(ContentType content_type) {
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content_types[content_type.content_type_ns_uri()] = content_type;
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}
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public ContentType? get_content_type(string ns_uri) {
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if (!content_types.has_key(ns_uri)) {
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return null;
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}
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return content_types[ns_uri];
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}
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public void register_transport(Transport transport) {
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transports[transport.transport_ns_uri()] = transport;
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}
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public Transport? get_transport(string ns_uri) {
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if (!transports.has_key(ns_uri)) {
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return null;
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}
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return transports[ns_uri];
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}
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public Transport? select_transport(XmppStream stream, TransportType type, Jid receiver_full_jid) {
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foreach (Transport transport in transports.values) {
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if (transport.transport_type() != type) {
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continue;
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}
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// TODO(hrxi): prioritization
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if (transport.is_transport_available(stream, receiver_full_jid)) {
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return transport;
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}
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}
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return null;
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}
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private bool is_jingle_available(XmppStream stream, Jid full_jid) {
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bool? has_jingle = stream.get_flag(ServiceDiscovery.Flag.IDENTITY).has_entity_feature(full_jid, NS_URI);
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return has_jingle != null && has_jingle;
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}
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public bool is_available(XmppStream stream, TransportType type, Jid full_jid) {
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return is_jingle_available(stream, full_jid) && select_transport(stream, type, full_jid) != null;
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}
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public Session create_session(XmppStream stream, TransportType type, Jid receiver_full_jid, Senders senders, string content_name, StanzaNode description) throws Error {
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if (!is_jingle_available(stream, receiver_full_jid)) {
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throw new Error.NO_SHARED_PROTOCOLS("No Jingle support");
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}
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Transport? transport = select_transport(stream, type, receiver_full_jid);
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if (transport == null) {
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throw new Error.NO_SHARED_PROTOCOLS("No suitable transports");
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}
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Jid? my_jid = stream.get_flag(Bind.Flag.IDENTITY).my_jid;
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if (my_jid == null) {
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throw new Error.GENERAL("Couldn't determine own JID");
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}
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TransportParameters transport_params = transport.create_transport_parameters();
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Session session = new Session.initiate_sent(random_uuid(), type, transport_params, receiver_full_jid, content_name);
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StanzaNode content = new StanzaNode.build("content", NS_URI)
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.put_attribute("creator", "initiator")
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.put_attribute("name", content_name)
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.put_attribute("senders", senders.to_string())
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.put_node(description)
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.put_node(transport_params.to_transport_stanza_node());
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StanzaNode jingle = new StanzaNode.build("jingle", NS_URI)
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.add_self_xmlns()
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.put_attribute("action", "session-initiate")
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.put_attribute("initiator", my_jid.to_string())
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.put_attribute("sid", session.sid)
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.put_node(content);
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Iq.Stanza iq = new Iq.Stanza.set(jingle) { to=receiver_full_jid };
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, iq, (stream, iq) => {
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// TODO(hrxi): handle errors
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stream.get_flag(Flag.IDENTITY).add_session(session);
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});
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return session;
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}
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public void handle_session_initiate(XmppStream stream, string sid, StanzaNode jingle, Iq.Stanza iq) throws IqError {
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Gee.List<StanzaNode> contents = jingle.get_subnodes("content");
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if (contents.size == 0) {
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throw new IqError.BAD_REQUEST("missing content node");
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}
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if (contents.size > 1) {
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throw new IqError.NOT_IMPLEMENTED("can't process multiple content nodes");
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}
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StanzaNode content = contents[0];
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string? name = content.get_attribute("name");
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StanzaNode description = get_single_node_anyns(content, "description");
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StanzaNode transport_node = get_single_node_anyns(content, "transport");
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if (name == null) {
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throw new IqError.BAD_REQUEST("missing name");
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}
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Transport? transport = get_transport(transport_node.ns_uri);
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TransportParameters? transport_params = null;
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if (transport != null) {
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transport_params = transport.parse_transport_parameters(transport_node);
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} else {
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// terminate the session below
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}
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ContentType? content_type = get_content_type(description.ns_uri);
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if (content_type == null) {
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// TODO(hrxi): how do we signal an unknown content type?
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throw new IqError.NOT_IMPLEMENTED("unknown content type");
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}
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ContentParameters content_params = content_type.parse_content_parameters(description);
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TransportType type = content_type.content_type_transport_type();
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Session session = new Session.initiate_received(sid, type, transport_params, iq.from, name);
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stream.get_flag(Flag.IDENTITY).add_session(session);
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.result(iq));
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if (transport == null || transport.transport_type() != type) {
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StanzaNode reason = new StanzaNode.build("reason", NS_URI)
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.put_node(new StanzaNode.build("unsupported-transports", NS_URI));
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session.terminate(stream, reason);
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return;
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}
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content_params.on_session_initiate(stream, session);
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}
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public void on_iq_set(XmppStream stream, Iq.Stanza iq) {
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try {
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handle_iq_set(stream, iq);
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} catch (IqError e) {
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send_iq_error(e, stream, iq);
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}
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}
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public void handle_iq_set(XmppStream stream, Iq.Stanza iq) throws IqError {
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StanzaNode? jingle = iq.stanza.get_subnode("jingle", NS_URI);
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string? sid = jingle != null ? jingle.get_attribute("sid") : null;
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string? action = jingle != null ? jingle.get_attribute("action") : null;
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if (jingle == null || sid == null || action == null) {
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throw new IqError.BAD_REQUEST("missing jingle node, sid or action");
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}
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Session? session = stream.get_flag(Flag.IDENTITY).get_session(sid);
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if (action == "session-initiate") {
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if (session != null) {
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// TODO(hrxi): Info leak if other clients use predictable session IDs?
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.error(iq, new ErrorStanza.build(ErrorStanza.TYPE_MODIFY, ErrorStanza.CONDITION_CONFLICT, "session ID already in use", null)));
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return;
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}
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handle_session_initiate(stream, sid, jingle, iq);
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return;
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}
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if (session == null) {
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StanzaNode unknown_session = new StanzaNode.build("unknown-session", ERROR_NS_URI).add_self_xmlns();
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.error(iq, new ErrorStanza.item_not_found(unknown_session)));
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return;
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}
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session.handle_iq_set(stream, action, jingle, iq);
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}
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public override string get_ns() { return NS_URI; }
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public override string get_id() { return IDENTITY.id; }
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}
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public enum TransportType {
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DATAGRAM,
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STREAMING,
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}
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public enum Senders {
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BOTH,
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INITIATOR,
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NONE,
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RESPONDER;
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public string to_string() {
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switch (this) {
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case BOTH: return "both";
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case INITIATOR: return "initiator";
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case NONE: return "none";
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case RESPONDER: return "responder";
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}
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assert_not_reached();
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}
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}
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public interface Transport : Object {
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public abstract string transport_ns_uri();
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public abstract bool is_transport_available(XmppStream stream, Jid full_jid);
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public abstract TransportType transport_type();
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public abstract TransportParameters create_transport_parameters();
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public abstract TransportParameters parse_transport_parameters(StanzaNode transport) throws IqError;
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}
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public interface TransportParameters : Object {
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public abstract string transport_ns_uri();
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public abstract StanzaNode to_transport_stanza_node();
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public abstract void update_transport(StanzaNode transport) throws IqError;
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public abstract IOStream create_transport_connection(XmppStream stream, Jid peer_full_jid, Role role);
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}
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public enum Role {
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INITIATOR,
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RESPONDER;
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public string to_string() {
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switch (this) {
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case INITIATOR: return "initiator";
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case RESPONDER: return "responder";
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}
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assert_not_reached();
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}
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}
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public interface ContentType : Object {
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public abstract string content_type_ns_uri();
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public abstract TransportType content_type_transport_type();
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public abstract ContentParameters parse_content_parameters(StanzaNode description) throws IqError;
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}
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public interface ContentParameters : Object {
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public abstract void on_session_initiate(XmppStream stream, Session session);
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}
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public class Session {
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// INITIATE_SENT -> ACTIVE -> ENDED
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// INITIATE_RECEIVED -> ACTIVE -> ENDED
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public enum State {
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INITIATE_SENT,
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INITIATE_RECEIVED,
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ACTIVE,
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ENDED,
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}
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public State state { get; private set; }
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public string sid { get; private set; }
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public Type type_ { get; private set; }
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public Jid peer_full_jid { get; private set; }
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public string content_name { get; private set; }
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// INITIATE_SENT | INITIATE_RECEIVED
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TransportParameters? transport = null;
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// ACTIVE
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public IOStream? conn { get; private set; }
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// Only interesting in INITIATE_SENT.
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// Signals that the session has been accepted by the peer.
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public signal void accepted(XmppStream stream);
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public Session.initiate_sent(string sid, Type type, TransportParameters transport, Jid peer_full_jid, string content_name) {
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this.state = INITIATE_SENT;
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this.sid = sid;
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this.type_ = type;
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this.peer_full_jid = peer_full_jid;
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this.content_name = content_name;
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this.transport = transport;
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this.conn = null;
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}
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public Session.initiate_received(string sid, Type type, TransportParameters? transport, Jid peer_full_jid, string content_name) {
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this.state = INITIATE_RECEIVED;
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this.sid = sid;
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this.type_ = type;
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this.peer_full_jid = peer_full_jid;
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this.content_name = content_name;
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this.transport = transport;
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this.conn = null;
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}
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public void handle_iq_set(XmppStream stream, string action, StanzaNode jingle, Iq.Stanza iq) throws IqError {
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switch (action) {
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case "session-accept":
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if (state != INITIATE_SENT) {
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throw new IqError.OUT_OF_ORDER("got session-accept while not waiting for one");
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}
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handle_session_accept(stream, jingle, iq);
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break;
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case "session-terminate":
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handle_session_terminate(stream, jingle, iq);
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break;
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case "content-accept":
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case "content-add":
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case "content-modify":
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case "content-reject":
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case "content-remove":
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case "security-info":
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case "transport-accept":
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case "transport-info":
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case "transport-reject":
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case "transport-replace":
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throw new IqError.NOT_IMPLEMENTED(@"$(action) is not implemented");
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default:
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throw new IqError.BAD_REQUEST("invalid action");
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}
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}
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void handle_session_accept(XmppStream stream, StanzaNode jingle, Iq.Stanza iq) throws IqError {
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string? responder_str = jingle.get_attribute("responder");
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Jid responder;
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if (responder_str != null) {
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responder = Jid.parse(responder_str) ?? iq.from;
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} else {
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responder = iq.from; // TODO(hrxi): and above, can we assume iq.from != null
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// TODO(hrxi): more sanity checking, perhaps replace who we're talking to
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}
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if (!responder.is_full()) {
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throw new IqError.BAD_REQUEST("invalid responder JID");
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}
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Gee.List<StanzaNode> contents = jingle.get_subnodes("content");
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if (contents.size == 0) {
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// TODO(hrxi): here and below, should we terminate the session?
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throw new IqError.BAD_REQUEST("missing content node");
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}
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if (contents.size > 1) {
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throw new IqError.NOT_IMPLEMENTED("can't process multiple content nodes");
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}
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StanzaNode content = contents[0];
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StanzaNode description = get_single_node_anyns(content, "description");
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StanzaNode transport_node = get_single_node_anyns(content, "transport");
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if (transport_node.ns_uri != transport.transport_ns_uri()) {
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throw new IqError.BAD_REQUEST("session-accept with unnegotiated transport method");
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}
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transport.update_transport(transport_node);
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conn = transport.create_transport_connection(stream, peer_full_jid, Role.INITIATOR);
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transport = null;
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.result(iq));
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state = ACTIVE;
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accepted(stream);
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}
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void handle_session_terminate(XmppStream stream, StanzaNode jingle, Iq.Stanza iq) throws IqError {
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, new Iq.Stanza.result(iq));
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// TODO(hrxi): also handle presence type=unavailable
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}
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public void accept(XmppStream stream, StanzaNode description) {
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if (state != INITIATE_RECEIVED) {
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return; // TODO(hrxi): what to do?
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}
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StanzaNode jingle = new StanzaNode.build("jingle", NS_URI)
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.add_self_xmlns()
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.put_attribute("action", "session-accept")
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.put_attribute("sid", sid)
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.put_node(new StanzaNode.build("content", NS_URI)
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.put_attribute("creator", "initiator")
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.put_attribute("name", content_name)
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.put_node(description)
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.put_node(transport.to_transport_stanza_node())
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);
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Iq.Stanza iq = new Iq.Stanza.set(jingle) { to=peer_full_jid };
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stream.get_module(Iq.Module.IDENTITY).send_iq(stream, iq);
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conn = transport.create_transport_connection(stream, peer_full_jid, Role.RESPONDER);
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transport = null;
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state = ACTIVE;
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}
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public void reject(XmppStream stream) {
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if (state != INITIATE_RECEIVED) {
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return; // TODO(hrxi): what to do?
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}
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StanzaNode reason = new StanzaNode.build("reason", NS_URI)
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.put_node(new StanzaNode.build("decline", NS_URI));
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terminate(stream, reason);
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}
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public void set_application_error(XmppStream stream, StanzaNode? application_reason = null) {
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StanzaNode reason = new StanzaNode.build("reason", NS_URI)
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.put_node(new StanzaNode.build("failed-application", NS_URI));
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if (application_reason != null) {
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reason.put_node(application_reason);
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}
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terminate(stream, reason);
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}
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public void close_connection(XmppStream stream) {
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if (state != ACTIVE) {
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return; // TODO(hrxi): what to do?
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}
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conn.close();
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}
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public void terminate(XmppStream stream, StanzaNode reason) {
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if (state != INITIATE_SENT && state != INITIATE_RECEIVED && state != ACTIVE) {
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// TODO(hrxi): what to do?
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return;
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}
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if (state == ACTIVE) {
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conn.close();
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}
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|
|
StanzaNode jingle = new StanzaNode.build("jingle", NS_URI)
|
|
.add_self_xmlns()
|
|
.put_attribute("action", "session-terminate")
|
|
.put_attribute("sid", sid)
|
|
.put_node(reason);
|
|
Iq.Stanza iq = new Iq.Stanza.set(jingle) { to=peer_full_jid };
|
|
stream.get_module(Iq.Module.IDENTITY).send_iq(stream, iq);
|
|
|
|
state = ENDED;
|
|
// Immediately remove the session from the open sessions as per the
|
|
// XEP, don't wait for confirmation.
|
|
stream.get_flag(Flag.IDENTITY).remove_session(sid);
|
|
}
|
|
}
|
|
|
|
public class Flag : XmppStreamFlag {
|
|
public static FlagIdentity<Flag> IDENTITY = new FlagIdentity<Flag>(NS_URI, "jingle");
|
|
|
|
private HashMap<string, Session> sessions = new HashMap<string, Session>();
|
|
|
|
public void add_session(Session session) {
|
|
sessions[session.sid] = session;
|
|
}
|
|
public Session? get_session(string sid) {
|
|
return sessions.has_key(sid) ? sessions[sid] : null;
|
|
}
|
|
public void remove_session(string sid) {
|
|
sessions.unset(sid);
|
|
}
|
|
|
|
public override string get_ns() { return NS_URI; }
|
|
public override string get_id() { return IDENTITY.id; }
|
|
}
|
|
|
|
}
|