using Gee; using Xmpp; using Dino.Entities; namespace Dino { public class Calls : StreamInteractionModule, Object { public signal void call_incoming(Call call, Conversation conversation, bool video); public signal void call_outgoing(Call call, Conversation conversation); public signal void call_terminated(Call call, string? reason_name, string? reason_text); public signal void counterpart_ringing(Call call); public signal void counterpart_sends_video_updated(Call call, bool mute); public signal void info_received(Call call, Xep.JingleRtp.CallSessionInfo session_info); public signal void encryption_updated(Call call, Xep.Jingle.ContentEncryption? audio_encryption, Xep.Jingle.ContentEncryption? video_encryption, bool same); public signal void stream_created(Call call, string media); public static ModuleIdentity IDENTITY = new ModuleIdentity("calls"); public string id { get { return IDENTITY.id; } } private StreamInteractor stream_interactor; private Database db; private HashMap> sid_by_call = new HashMap>(Account.hash_func, Account.equals_func); private HashMap> call_by_sid = new HashMap>(Account.hash_func, Account.equals_func); public HashMap sessions = new HashMap(Call.hash_func, Call.equals_func); public HashMap jmi_call = new HashMap(Account.hash_func, Account.equals_func); public HashMap jmi_sid = new HashMap(Account.hash_func, Account.equals_func); public HashMap jmi_video = new HashMap(Account.hash_func, Account.equals_func); private HashMap counterpart_sends_video = new HashMap(Call.hash_func, Call.equals_func); private HashMap we_should_send_video = new HashMap(Call.hash_func, Call.equals_func); private HashMap we_should_send_audio = new HashMap(Call.hash_func, Call.equals_func); private HashMap audio_content_parameter = new HashMap(Call.hash_func, Call.equals_func); private HashMap video_content_parameter = new HashMap(Call.hash_func, Call.equals_func); private HashMap audio_content = new HashMap(Call.hash_func, Call.equals_func); private HashMap video_content = new HashMap(Call.hash_func, Call.equals_func); private HashMap> video_encryptions = new HashMap>(Call.hash_func, Call.equals_func); private HashMap> audio_encryptions = new HashMap>(Call.hash_func, Call.equals_func); public static void start(StreamInteractor stream_interactor, Database db) { Calls m = new Calls(stream_interactor, db); stream_interactor.add_module(m); } private Calls(StreamInteractor stream_interactor, Database db) { this.stream_interactor = stream_interactor; this.db = db; stream_interactor.account_added.connect(on_account_added); } public Xep.JingleRtp.Stream? get_video_stream(Call call) { if (video_content_parameter.has_key(call)) { return video_content_parameter[call].stream; } return null; } public Xep.JingleRtp.Stream? get_audio_stream(Call call) { if (audio_content_parameter.has_key(call)) { return audio_content_parameter[call].stream; } return null; } public async Call? initiate_call(Conversation conversation, bool video) { Call call = new Call(); call.direction = Call.DIRECTION_OUTGOING; call.account = conversation.account; call.counterpart = conversation.counterpart; call.ourpart = conversation.account.full_jid; call.time = call.local_time = new DateTime.now_utc(); call.state = Call.State.RINGING; stream_interactor.get_module(CallStore.IDENTITY).add_call(call, conversation); we_should_send_video[call] = video; we_should_send_audio[call] = true; Gee.List call_resources = yield get_call_resources(conversation); bool do_jmi = false; Jid? jid_for_direct = null; if (yield contains_jmi_resources(conversation.account, call_resources)) { do_jmi = true; } else if (!call_resources.is_empty) { jid_for_direct = call_resources[0]; } else if (has_jmi_resources(conversation)) { do_jmi = true; } if (do_jmi) { XmppStream? stream = stream_interactor.get_stream(conversation.account); jmi_call[conversation.account] = call; jmi_video[conversation.account] = video; jmi_sid[conversation.account] = Xmpp.random_uuid(); call_by_sid[call.account][jmi_sid[conversation.account]] = call; var descriptions = new ArrayList(); descriptions.add(new StanzaNode.build("description", Xep.JingleRtp.NS_URI).add_self_xmlns().put_attribute("media", "audio")); if (video) { descriptions.add(new StanzaNode.build("description", Xep.JingleRtp.NS_URI).add_self_xmlns().put_attribute("media", "video")); } stream.get_module(Xmpp.Xep.JingleMessageInitiation.Module.IDENTITY).send_session_propose_to_peer(stream, conversation.counterpart, jmi_sid[call.account], descriptions); } else if (jid_for_direct != null) { yield call_resource(conversation.account, jid_for_direct, call, video); } conversation.last_active = call.time; call_outgoing(call, conversation); return call; } private async void call_resource(Account account, Jid full_jid, Call call, bool video, string? sid = null) { XmppStream? stream = stream_interactor.get_stream(account); if (stream == null) return; Xep.Jingle.Session session = yield stream.get_module(Xep.JingleRtp.Module.IDENTITY).start_call(stream, full_jid, video, sid); sessions[call] = session; sid_by_call[call.account][call] = session.sid; connect_session_signals(call, session); } public void end_call(Conversation conversation, Call call) { XmppStream? stream = stream_interactor.get_stream(call.account); if (stream == null) return; if (call.state == Call.State.IN_PROGRESS || call.state == Call.State.ESTABLISHING) { sessions[call].terminate(Xep.Jingle.ReasonElement.SUCCESS, null, "success"); call.state = Call.State.ENDED; } else if (call.state == Call.State.RINGING) { if (sessions.has_key(call)) { sessions[call].terminate(Xep.Jingle.ReasonElement.CANCEL, null, "cancel"); } else { // Only a JMI so far stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_retract_to_peer(stream, call.counterpart, jmi_sid[call.account]); } call.state = Call.State.MISSED; } else { return; } call.end_time = new DateTime.now_utc(); remove_call_from_datastructures(call); } public void accept_call(Call call) { call.state = Call.State.ESTABLISHING; if (sessions.has_key(call)) { foreach (Xep.Jingle.Content content in sessions[call].contents) { content.accept(); } } else { // Only a JMI so far Account account = call.account; string sid = sid_by_call[call.account][call]; XmppStream stream = stream_interactor.get_stream(account); if (stream == null) return; jmi_call[account] = call; jmi_sid[account] = sid; jmi_video[account] = we_should_send_video[call]; stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_accept_to_self(stream, sid); stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_proceed_to_peer(stream, call.counterpart, sid); } } public void reject_call(Call call) { call.state = Call.State.DECLINED; if (sessions.has_key(call)) { foreach (Xep.Jingle.Content content in sessions[call].contents) { content.reject(); } remove_call_from_datastructures(call); } else { // Only a JMI so far XmppStream stream = stream_interactor.get_stream(call.account); if (stream == null) return; string sid = sid_by_call[call.account][call]; stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_reject_to_peer(stream, call.counterpart, sid); stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_reject_to_self(stream, sid); remove_call_from_datastructures(call); } } public void mute_own_audio(Call call, bool mute) { we_should_send_audio[call] = !mute; Xep.JingleRtp.Stream stream = audio_content_parameter[call].stream; // The user might mute audio before a feed was created. The feed will be muted as soon as it has been created. if (stream == null) return; // Inform our counterpart that we (un)muted our audio stream_interactor.module_manager.get_module(call.account, Xep.JingleRtp.Module.IDENTITY).session_info_type.send_mute(sessions[call], mute, "audio"); // Start/Stop sending audio data Application.get_default().plugin_registry.video_call_plugin.set_pause(stream, mute); } public void mute_own_video(Call call, bool mute) { we_should_send_video[call] = !mute; if (!sessions.has_key(call)) { // Call hasn't been established yet return; } Xep.JingleRtp.Module rtp_module = stream_interactor.module_manager.get_module(call.account, Xep.JingleRtp.Module.IDENTITY); if (video_content_parameter.has_key(call) && video_content_parameter[call].stream != null && sessions[call].senders_include_us(video_content[call].senders)) { // A video feed has already been established // Start/Stop sending video data Xep.JingleRtp.Stream stream = video_content_parameter[call].stream; if (stream != null) { // TODO maybe the user muted video before the feed was created... Application.get_default().plugin_registry.video_call_plugin.set_pause(stream, mute); } // Inform our counterpart that we started/stopped our video rtp_module.session_info_type.send_mute(sessions[call], mute, "video"); } else if (!mute) { // Need to start a new video feed XmppStream stream = stream_interactor.get_stream(call.account); rtp_module.add_outgoing_video_content.begin(stream, sessions[call], (_, res) => { if (video_content_parameter[call] == null) { Xep.Jingle.Content content = rtp_module.add_outgoing_video_content.end(res); Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter != null) { connect_content_signals(call, content, rtp_content_parameter); } } }); } // If video_feed == null && !mute we're trying to mute a non-existant feed. It will be muted as soon as it is created. } public async bool can_do_audio_calls_async(Conversation conversation) { if (!can_do_audio_calls()) return false; return (yield get_call_resources(conversation)).size > 0 || has_jmi_resources(conversation); } private bool can_do_audio_calls() { Plugins.VideoCallPlugin? plugin = Application.get_default().plugin_registry.video_call_plugin; if (plugin == null) return false; return plugin.supports("audio"); } public async bool can_do_video_calls_async(Conversation conversation) { if (!can_do_video_calls()) return false; return (yield get_call_resources(conversation)).size > 0 || has_jmi_resources(conversation); } private bool can_do_video_calls() { Plugins.VideoCallPlugin? plugin = Application.get_default().plugin_registry.video_call_plugin; if (plugin == null) return false; return plugin.supports("video"); } private async Gee.List get_call_resources(Conversation conversation) { ArrayList ret = new ArrayList(); XmppStream? stream = stream_interactor.get_stream(conversation.account); if (stream == null) return ret; Gee.List? full_jids = stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart); if (full_jids == null) return ret; foreach (Jid full_jid in full_jids) { bool supports_rtc = yield stream.get_module(Xep.JingleRtp.Module.IDENTITY).is_available(stream, full_jid); if (!supports_rtc) continue; ret.add(full_jid); } return ret; } private async bool contains_jmi_resources(Account account, Gee.List full_jids) { XmppStream? stream = stream_interactor.get_stream(account); if (stream == null) return false; foreach (Jid full_jid in full_jids) { bool does_jmi = yield stream_interactor.get_module(EntityInfo.IDENTITY).has_feature(account, full_jid, Xep.JingleMessageInitiation.NS_URI); if (does_jmi) return true; } return false; } private bool has_jmi_resources(Conversation conversation) { int64 jmi_resources = db.entity.select() .with(db.entity.jid_id, "=", db.get_jid_id(conversation.counterpart)) .join_with(db.entity_feature, db.entity.caps_hash, db.entity_feature.entity) .with(db.entity_feature.feature, "=", Xep.JingleMessageInitiation.NS_URI) .count(); return jmi_resources > 0; } public bool should_we_send_video(Call call) { return we_should_send_video[call]; } public Jid? is_call_in_progress() { foreach (Call call in sessions.keys) { if (call.state == Call.State.IN_PROGRESS || call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) { return call.counterpart; } } return null; } private void on_incoming_call(Account account, Xep.Jingle.Session session) { if (!can_do_audio_calls()) { warning("Incoming call but no call support detected. Ignoring."); return; } bool counterpart_wants_video = false; foreach (Xep.Jingle.Content content in session.contents) { Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter == null) continue; if (rtp_content_parameter.media == "video" && session.senders_include_us(content.senders)) { counterpart_wants_video = true; } } // Session might have already been accepted via Jingle Message Initiation bool already_accepted = jmi_sid.has_key(account) && jmi_sid[account] == session.sid && jmi_call[account].account.equals(account) && jmi_call[account].counterpart.equals_bare(session.peer_full_jid) && jmi_video[account] == counterpart_wants_video; Call? call = null; if (already_accepted) { call = jmi_call[account]; } else { call = create_received_call(account, session.peer_full_jid, account.full_jid, counterpart_wants_video); } sessions[call] = session; call_by_sid[account][session.sid] = call; sid_by_call[account][call] = session.sid; connect_session_signals(call, session); if (already_accepted) { accept_call(call); } else { stream_interactor.module_manager.get_module(account, Xep.JingleRtp.Module.IDENTITY).session_info_type.send_ringing(session); } } private Call create_received_call(Account account, Jid from, Jid to, bool video_requested) { Call call = new Call(); if (from.equals_bare(account.bare_jid)) { // Call requested by another of our devices call.direction = Call.DIRECTION_OUTGOING; call.ourpart = from; call.counterpart = to; } else { call.direction = Call.DIRECTION_INCOMING; call.ourpart = account.full_jid; call.counterpart = from; } call.account = account; call.time = call.local_time = new DateTime.now_utc(); call.state = Call.State.RINGING; Conversation conversation = stream_interactor.get_module(ConversationManager.IDENTITY).create_conversation(call.counterpart.bare_jid, account, Conversation.Type.CHAT); stream_interactor.get_module(CallStore.IDENTITY).add_call(call, conversation); conversation.last_active = call.time; we_should_send_video[call] = video_requested; we_should_send_audio[call] = true; if (call.direction == Call.DIRECTION_INCOMING) { call_incoming(call, conversation, video_requested); } else { call_outgoing(call, conversation); } return call; } private void on_incoming_content_add(XmppStream stream, Call call, Xep.Jingle.Session session, Xep.Jingle.Content content) { Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter == null) { content.reject(); return; } // Our peer shouldn't tell us to start sending, that's for us to initiate if (session.senders_include_us(content.senders)) { if (session.senders_include_counterpart(content.senders)) { // If our peer wants to send, let them content.modify(session.we_initiated ? Xep.Jingle.Senders.RESPONDER : Xep.Jingle.Senders.INITIATOR); } else { // If only we're supposed to send, reject content.reject(); } } connect_content_signals(call, content, rtp_content_parameter); content.accept(); } private void on_call_terminated(Call call, bool we_terminated, string? reason_name, string? reason_text) { if (call.state == Call.State.RINGING || call.state == Call.State.IN_PROGRESS || call.state == Call.State.ESTABLISHING) { call.end_time = new DateTime.now_utc(); } if (call.state == Call.State.IN_PROGRESS) { call.state = Call.State.ENDED; } else if (call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) { if (reason_name == Xep.Jingle.ReasonElement.DECLINE) { call.state = Call.State.DECLINED; } else { call.state = Call.State.FAILED; } } call_terminated(call, reason_name, reason_text); remove_call_from_datastructures(call); } private void on_stream_created(Call call, string media, Xep.JingleRtp.Stream stream) { if (media == "video" && stream.receiving) { counterpart_sends_video[call] = true; video_content_parameter[call].connection_ready.connect((status) => { counterpart_sends_video_updated(call, false); }); } stream_created(call, media); // Outgoing audio/video might have been muted in the meanwhile. if (media == "video" && !we_should_send_video[call]) { mute_own_video(call, true); } else if (media == "audio" && !we_should_send_audio[call]) { mute_own_audio(call, true); } } private void on_counterpart_mute_update(Call call, bool mute, string? media) { if (!call.equals(call)) return; if (media == "video") { counterpart_sends_video[call] = !mute; counterpart_sends_video_updated(call, mute); } } private void connect_session_signals(Call call, Xep.Jingle.Session session) { session.terminated.connect((stream, we_terminated, reason_name, reason_text) => on_call_terminated(call, we_terminated, reason_name, reason_text) ); session.additional_content_add_incoming.connect((session,stream, content) => on_incoming_content_add(stream, call, session, content) ); foreach (Xep.Jingle.Content content in session.contents) { Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter == null) continue; connect_content_signals(call, content, rtp_content_parameter); } } private void connect_content_signals(Call call, Xep.Jingle.Content content, Xep.JingleRtp.Parameters rtp_content_parameter) { if (rtp_content_parameter.media == "audio") { audio_content[call] = content; audio_content_parameter[call] = rtp_content_parameter; } else if (rtp_content_parameter.media == "video") { video_content[call] = content; video_content_parameter[call] = rtp_content_parameter; } rtp_content_parameter.stream_created.connect((stream) => on_stream_created(call, rtp_content_parameter.media, stream)); rtp_content_parameter.connection_ready.connect((status) => on_connection_ready(call, content, rtp_content_parameter.media)); content.senders_modify_incoming.connect((content, proposed_senders) => { if (content.session.senders_include_us(content.senders) != content.session.senders_include_us(proposed_senders)) { warning("counterpart set us to (not)sending %s. ignoring", content.content_name); return; } if (!content.session.senders_include_counterpart(content.senders) && content.session.senders_include_counterpart(proposed_senders)) { // Counterpart wants to start sending. Ok. content.accept_content_modify(proposed_senders); on_counterpart_mute_update(call, false, "video"); } }); } private void on_connection_ready(Call call, Xep.Jingle.Content content, string media) { if (call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) { call.state = Call.State.IN_PROGRESS; } if (media == "audio") { audio_encryptions[call] = content.encryptions; } else if (media == "video") { video_encryptions[call] = content.encryptions; } if ((audio_encryptions.has_key(call) && audio_encryptions[call].is_empty) || (video_encryptions.has_key(call) && video_encryptions[call].is_empty)) { call.encryption = Encryption.NONE; encryption_updated(call, null, null, true); return; } HashMap encryptions = audio_encryptions[call] ?? video_encryptions[call]; Xep.Jingle.ContentEncryption? omemo_encryption = null, dtls_encryption = null, srtp_encryption = null; foreach (string encr_name in encryptions.keys) { if (video_encryptions.has_key(call) && !video_encryptions[call].has_key(encr_name)) continue; var encryption = encryptions[encr_name]; if (encryption.encryption_ns == "http://gultsch.de/xmpp/drafts/omemo/dlts-srtp-verification") { omemo_encryption = encryption; } else if (encryption.encryption_ns == Xep.JingleIceUdp.DTLS_NS_URI) { dtls_encryption = encryption; } else if (encryption.encryption_name == "SRTP") { srtp_encryption = encryption; } } if (omemo_encryption != null && dtls_encryption != null) { call.encryption = Encryption.OMEMO; Xep.Jingle.ContentEncryption? video_encryption = video_encryptions.has_key(call) ? video_encryptions[call]["http://gultsch.de/xmpp/drafts/omemo/dlts-srtp-verification"] : null; omemo_encryption.peer_key = dtls_encryption.peer_key; omemo_encryption.our_key = dtls_encryption.our_key; encryption_updated(call, omemo_encryption, video_encryption, true); } else if (dtls_encryption != null) { call.encryption = Encryption.DTLS_SRTP; Xep.Jingle.ContentEncryption? video_encryption = video_encryptions.has_key(call) ? video_encryptions[call][Xep.JingleIceUdp.DTLS_NS_URI] : null; bool same = true; if (video_encryption != null && dtls_encryption.peer_key.length == video_encryption.peer_key.length) { for (int i = 0; i < dtls_encryption.peer_key.length; i++) { if (dtls_encryption.peer_key[i] != video_encryption.peer_key[i]) { same = false; break; } } } encryption_updated(call, dtls_encryption, video_encryption, same); } else if (srtp_encryption != null) { call.encryption = Encryption.SRTP; encryption_updated(call, srtp_encryption, video_encryptions[call]["SRTP"], false); } else { call.encryption = Encryption.NONE; encryption_updated(call, null, null, true); } } private void remove_call_from_datastructures(Call call) { string? sid = sid_by_call[call.account][call]; sid_by_call[call.account].unset(call); if (sid != null) call_by_sid[call.account].unset(sid); sessions.unset(call); counterpart_sends_video.unset(call); we_should_send_video.unset(call); we_should_send_audio.unset(call); audio_content_parameter.unset(call); video_content_parameter.unset(call); audio_content.unset(call); video_content.unset(call); audio_encryptions.unset(call); video_encryptions.unset(call); } private void on_account_added(Account account) { call_by_sid[account] = new HashMap(); sid_by_call[account] = new HashMap(); Xep.Jingle.Module jingle_module = stream_interactor.module_manager.get_module(account, Xep.Jingle.Module.IDENTITY); jingle_module.session_initiate_received.connect((stream, session) => { foreach (Xep.Jingle.Content content in session.contents) { Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter != null) { on_incoming_call(account, session); break; } } }); var session_info_type = stream_interactor.module_manager.get_module(account, Xep.JingleRtp.Module.IDENTITY).session_info_type; session_info_type.mute_update_received.connect((session,mute, name) => { if (!call_by_sid[account].has_key(session.sid)) return; Call call = call_by_sid[account][session.sid]; foreach (Xep.Jingle.Content content in session.contents) { if (name == null || content.content_name == name) { Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters; if (rtp_content_parameter != null) { on_counterpart_mute_update(call, mute, rtp_content_parameter.media); } } } }); session_info_type.info_received.connect((session, session_info) => { if (!call_by_sid[account].has_key(session.sid)) return; Call call = call_by_sid[account][session.sid]; info_received(call, session_info); }); Xep.JingleMessageInitiation.Module mi_module = stream_interactor.module_manager.get_module(account, Xep.JingleMessageInitiation.Module.IDENTITY); mi_module.session_proposed.connect((from, to, sid, descriptions) => { if (!can_do_audio_calls()) { warning("Incoming call but no call support detected. Ignoring."); return; } bool audio_requested = descriptions.any_match((description) => description.ns_uri == Xep.JingleRtp.NS_URI && description.get_attribute("media") == "audio"); bool video_requested = descriptions.any_match((description) => description.ns_uri == Xep.JingleRtp.NS_URI && description.get_attribute("media") == "video"); if (!audio_requested && !video_requested) return; Call call = create_received_call(account, from, to, video_requested); call_by_sid[account][sid] = call; sid_by_call[account][call] = sid; }); mi_module.session_accepted.connect((from, sid) => { if (!call_by_sid[account].has_key(sid)) return; if (from.equals_bare(account.bare_jid)) { // Carboned message from our account // Ignore carbon from ourselves if (from.equals(account.full_jid)) return; Call call = call_by_sid[account][sid]; call.state = Call.State.OTHER_DEVICE_ACCEPTED; remove_call_from_datastructures(call); } else if (from.equals_bare(call_by_sid[account][sid].counterpart)) { // Message from our peer // We proposed the call if (jmi_sid.has_key(account) && jmi_sid[account] == sid) { call_resource.begin(account, from, jmi_call[account], jmi_video[account], jmi_sid[account]); jmi_call.unset(account); jmi_sid.unset(account); jmi_video.unset(account); } } }); mi_module.session_rejected.connect((from, to, sid) => { if (!call_by_sid[account].has_key(sid)) return; Call call = call_by_sid[account][sid]; bool outgoing_reject = call.direction == Call.DIRECTION_OUTGOING && from.equals_bare(call.counterpart); bool incoming_reject = call.direction == Call.DIRECTION_INCOMING && from.equals_bare(account.bare_jid); if (!(outgoing_reject || incoming_reject)) return; call.state = Call.State.DECLINED; remove_call_from_datastructures(call); call_terminated(call, null, null); }); mi_module.session_retracted.connect((from, to, sid) => { if (!call_by_sid[account].has_key(sid)) return; Call call = call_by_sid[account][sid]; bool outgoing_retract = call.direction == Call.DIRECTION_OUTGOING && from.equals_bare(call.counterpart); bool incoming_retract = call.direction == Call.DIRECTION_INCOMING && from.equals_bare(account.bare_jid); if (!(outgoing_retract || incoming_retract)) return; call.state = Call.State.MISSED; remove_call_from_datastructures(call); call_terminated(call, null, null); }); } } }