package eu.siacs.conversations.xmpp.jingle; import android.os.SystemClock; import android.util.Log; import com.google.common.base.Optional; import com.google.common.base.Preconditions; import com.google.common.base.Strings; import com.google.common.base.Throwables; import com.google.common.collect.Collections2; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableMap; import com.google.common.collect.Sets; import com.google.common.primitives.Ints; import com.google.common.util.concurrent.ListenableFuture; import org.webrtc.EglBase; import org.webrtc.IceCandidate; import org.webrtc.PeerConnection; import org.webrtc.VideoTrack; import java.util.ArrayDeque; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.TimeUnit; import eu.siacs.conversations.Config; import eu.siacs.conversations.crypto.axolotl.AxolotlService; import eu.siacs.conversations.crypto.axolotl.CryptoFailedException; import eu.siacs.conversations.crypto.axolotl.FingerprintStatus; import eu.siacs.conversations.entities.Account; import eu.siacs.conversations.entities.Conversation; import eu.siacs.conversations.entities.Conversational; import eu.siacs.conversations.entities.Message; import eu.siacs.conversations.entities.RtpSessionStatus; import eu.siacs.conversations.services.AppRTCAudioManager; import eu.siacs.conversations.utils.IP; import eu.siacs.conversations.xml.Element; import eu.siacs.conversations.xml.Namespace; import eu.siacs.conversations.xmpp.Jid; import eu.siacs.conversations.xmpp.jingle.stanzas.Group; import eu.siacs.conversations.xmpp.jingle.stanzas.IceUdpTransportInfo; import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket; import eu.siacs.conversations.xmpp.jingle.stanzas.Proceed; import eu.siacs.conversations.xmpp.jingle.stanzas.Propose; import eu.siacs.conversations.xmpp.jingle.stanzas.Reason; import eu.siacs.conversations.xmpp.jingle.stanzas.RtpDescription; import eu.siacs.conversations.xmpp.stanzas.IqPacket; import eu.siacs.conversations.xmpp.stanzas.MessagePacket; public class JingleRtpConnection extends AbstractJingleConnection implements WebRTCWrapper.EventCallback { public static final List STATES_SHOWING_ONGOING_CALL = Arrays.asList( State.PROCEED, State.SESSION_INITIALIZED_PRE_APPROVED, State.SESSION_ACCEPTED ); private static final long BUSY_TIME_OUT = 30; private static final List TERMINATED = Arrays.asList( State.ACCEPTED, State.REJECTED, State.REJECTED_RACED, State.RETRACTED, State.RETRACTED_RACED, State.TERMINATED_SUCCESS, State.TERMINATED_DECLINED_OR_BUSY, State.TERMINATED_CONNECTIVITY_ERROR, State.TERMINATED_CANCEL_OR_TIMEOUT, State.TERMINATED_APPLICATION_FAILURE ); private static final Map> VALID_TRANSITIONS; static { final ImmutableMap.Builder> transitionBuilder = new ImmutableMap.Builder<>(); transitionBuilder.put(State.NULL, ImmutableList.of( State.PROPOSED, State.SESSION_INITIALIZED, State.TERMINATED_APPLICATION_FAILURE )); transitionBuilder.put(State.PROPOSED, ImmutableList.of( State.ACCEPTED, State.PROCEED, State.REJECTED, State.RETRACTED, State.TERMINATED_APPLICATION_FAILURE, State.TERMINATED_CONNECTIVITY_ERROR //only used when the xmpp connection rebinds )); transitionBuilder.put(State.PROCEED, ImmutableList.of( State.REJECTED_RACED, State.RETRACTED_RACED, State.SESSION_INITIALIZED_PRE_APPROVED, State.TERMINATED_SUCCESS, State.TERMINATED_APPLICATION_FAILURE, State.TERMINATED_CONNECTIVITY_ERROR //at this state used for error bounces of the proceed message )); transitionBuilder.put(State.SESSION_INITIALIZED, ImmutableList.of( State.SESSION_ACCEPTED, State.TERMINATED_SUCCESS, State.TERMINATED_DECLINED_OR_BUSY, State.TERMINATED_CONNECTIVITY_ERROR, //at this state used for IQ errors and IQ timeouts State.TERMINATED_CANCEL_OR_TIMEOUT, State.TERMINATED_APPLICATION_FAILURE )); transitionBuilder.put(State.SESSION_INITIALIZED_PRE_APPROVED, ImmutableList.of( State.SESSION_ACCEPTED, State.TERMINATED_SUCCESS, State.TERMINATED_DECLINED_OR_BUSY, State.TERMINATED_CONNECTIVITY_ERROR, //at this state used for IQ errors and IQ timeouts State.TERMINATED_CANCEL_OR_TIMEOUT, State.TERMINATED_APPLICATION_FAILURE )); transitionBuilder.put(State.SESSION_ACCEPTED, ImmutableList.of( State.TERMINATED_SUCCESS, State.TERMINATED_DECLINED_OR_BUSY, State.TERMINATED_CONNECTIVITY_ERROR, State.TERMINATED_CANCEL_OR_TIMEOUT, State.TERMINATED_APPLICATION_FAILURE )); VALID_TRANSITIONS = transitionBuilder.build(); } private final WebRTCWrapper webRTCWrapper = new WebRTCWrapper(this); private final ArrayDeque>> pendingIceCandidates = new ArrayDeque<>(); private final OmemoVerification omemoVerification = new OmemoVerification(); private final Message message; private State state = State.NULL; private StateTransitionException stateTransitionException; private Set proposedMedia; private RtpContentMap initiatorRtpContentMap; private RtpContentMap responderRtpContentMap; private long rtpConnectionStarted = 0; //time of 'connected' private long rtpConnectionEnded = 0; private ScheduledFuture ringingTimeoutFuture; JingleRtpConnection(JingleConnectionManager jingleConnectionManager, Id id, Jid initiator) { super(jingleConnectionManager, id, initiator); final Conversation conversation = jingleConnectionManager.getXmppConnectionService().findOrCreateConversation( id.account, id.with.asBareJid(), false, false ); this.message = new Message( conversation, isInitiator() ? Message.STATUS_SEND : Message.STATUS_RECEIVED, Message.TYPE_RTP_SESSION, id.sessionId ); } private static State reasonToState(Reason reason) { switch (reason) { case SUCCESS: return State.TERMINATED_SUCCESS; case DECLINE: case BUSY: return State.TERMINATED_DECLINED_OR_BUSY; case CANCEL: case TIMEOUT: return State.TERMINATED_CANCEL_OR_TIMEOUT; case FAILED_APPLICATION: case SECURITY_ERROR: case UNSUPPORTED_TRANSPORTS: case UNSUPPORTED_APPLICATIONS: return State.TERMINATED_APPLICATION_FAILURE; default: return State.TERMINATED_CONNECTIVITY_ERROR; } } @Override synchronized void deliverPacket(final JinglePacket jinglePacket) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": packet delivered to JingleRtpConnection"); switch (jinglePacket.getAction()) { case SESSION_INITIATE: receiveSessionInitiate(jinglePacket); break; case TRANSPORT_INFO: receiveTransportInfo(jinglePacket); break; case SESSION_ACCEPT: receiveSessionAccept(jinglePacket); break; case SESSION_TERMINATE: receiveSessionTerminate(jinglePacket); break; default: respondOk(jinglePacket); Log.d(Config.LOGTAG, String.format("%s: received unhandled jingle action %s", id.account.getJid().asBareJid(), jinglePacket.getAction())); break; } } @Override synchronized void notifyRebound() { if (isTerminated()) { return; } webRTCWrapper.close(); if (!isInitiator() && isInState(State.PROPOSED, State.SESSION_INITIALIZED)) { xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); } if (isInState(State.SESSION_INITIALIZED, State.SESSION_INITIALIZED_PRE_APPROVED, State.SESSION_ACCEPTED)) { //we might have already changed resources (full jid) at this point; so this might not even reach the other party sendSessionTerminate(Reason.CONNECTIVITY_ERROR); } else { transitionOrThrow(State.TERMINATED_CONNECTIVITY_ERROR); finish(); } } private void receiveSessionTerminate(final JinglePacket jinglePacket) { respondOk(jinglePacket); final JinglePacket.ReasonWrapper wrapper = jinglePacket.getReason(); final State previous = this.state; Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received session terminate reason=" + wrapper.reason + "(" + Strings.nullToEmpty(wrapper.text) + ") while in state " + previous); if (TERMINATED.contains(previous)) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring session terminate because already in " + previous); return; } webRTCWrapper.close(); final State target = reasonToState(wrapper.reason); transitionOrThrow(target); writeLogMessage(target); if (previous == State.PROPOSED || previous == State.SESSION_INITIALIZED) { xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); } finish(); } private void receiveTransportInfo(final JinglePacket jinglePacket) { if (isInState(State.SESSION_INITIALIZED, State.SESSION_INITIALIZED_PRE_APPROVED, State.SESSION_ACCEPTED)) { respondOk(jinglePacket); final RtpContentMap contentMap; try { contentMap = RtpContentMap.of(jinglePacket); } catch (IllegalArgumentException | NullPointerException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": improperly formatted contents; ignoring", e); return; } final Set> candidates = contentMap.contents.entrySet(); if (this.state == State.SESSION_ACCEPTED) { try { processCandidates(candidates); } catch (final WebRTCWrapper.PeerConnectionNotInitialized e) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": PeerConnection was not initialized when processing transport info. this usually indicates a race condition that can be ignored"); } } else { pendingIceCandidates.push(candidates); } } else { if (isTerminated()) { respondOk(jinglePacket); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring out-of-order transport info; we where already terminated"); } else { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received transport info while in state=" + this.state); terminateWithOutOfOrder(jinglePacket); } } } private void processCandidates(final Set> contents) { final RtpContentMap rtpContentMap = isInitiator() ? this.responderRtpContentMap : this.initiatorRtpContentMap; final Group originalGroup = rtpContentMap.group; final List identificationTags = originalGroup == null ? rtpContentMap.getNames() : originalGroup.getIdentificationTags(); if (identificationTags.size() == 0) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": no identification tags found in initial offer. we won't be able to calculate mLineIndices"); } processCandidates(identificationTags, contents); } private void processCandidates(final List indices, final Set> contents) { for (final Map.Entry content : contents) { final String ufrag = content.getValue().transport.getAttribute("ufrag"); for (final IceUdpTransportInfo.Candidate candidate : content.getValue().transport.getCandidates()) { final String sdp; try { sdp = candidate.toSdpAttribute(ufrag); } catch (IllegalArgumentException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring invalid ICE candidate " + e.getMessage()); continue; } final String sdpMid = content.getKey(); final int mLineIndex = indices.indexOf(sdpMid); final IceCandidate iceCandidate = new IceCandidate(sdpMid, mLineIndex, sdp); Log.d(Config.LOGTAG, "received candidate: " + iceCandidate); this.webRTCWrapper.addIceCandidate(iceCandidate); } } } private RtpContentMap receiveRtpContentMap(final JinglePacket jinglePacket, final boolean expectVerification) { final RtpContentMap receivedContentMap = RtpContentMap.of(jinglePacket); if (receivedContentMap instanceof OmemoVerifiedRtpContentMap) { final AxolotlService.OmemoVerifiedPayload omemoVerifiedPayload; try { omemoVerifiedPayload = id.account.getAxolotlService().decrypt((OmemoVerifiedRtpContentMap) receivedContentMap, id.with); } catch (final CryptoFailedException e) { throw new SecurityException("Unable to verify DTLS Fingerprint with OMEMO", e); } this.omemoVerification.setOrEnsureEqual(omemoVerifiedPayload); Log.d(Config.LOGTAG,id.account.getJid().asBareJid()+": received verifiable DTLS fingerprint via "+this.omemoVerification); return omemoVerifiedPayload.getPayload(); } else if (expectVerification) { throw new SecurityException("DTLS fingerprint was unexpectedly not verifiable"); } else { return receivedContentMap; } } private void receiveSessionInitiate(final JinglePacket jinglePacket) { if (isInitiator()) { Log.d(Config.LOGTAG, String.format("%s: received session-initiate even though we were initiating", id.account.getJid().asBareJid())); terminateWithOutOfOrder(jinglePacket); return; } final RtpContentMap contentMap; try { contentMap = receiveRtpContentMap(jinglePacket, false); contentMap.requireContentDescriptions(); contentMap.requireDTLSFingerprint(); } catch (final RuntimeException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": improperly formatted contents", Throwables.getRootCause(e)); respondOk(jinglePacket); sendSessionTerminate(Reason.of(e), e.getMessage()); return; } Log.d(Config.LOGTAG, "processing session-init with " + contentMap.contents.size() + " contents"); final State target; if (this.state == State.PROCEED) { Preconditions.checkState( proposedMedia != null && proposedMedia.size() > 0, "proposed media must be set when processing pre-approved session-initiate" ); if (!this.proposedMedia.equals(contentMap.getMedia())) { sendSessionTerminate(Reason.SECURITY_ERROR, String.format( "Your session proposal (Jingle Message Initiation) included media %s but your session-initiate was %s", this.proposedMedia, contentMap.getMedia() )); return; } target = State.SESSION_INITIALIZED_PRE_APPROVED; } else { target = State.SESSION_INITIALIZED; } if (transition(target, () -> this.initiatorRtpContentMap = contentMap)) { respondOk(jinglePacket); //TODO Do not push empty set pendingIceCandidates.push(contentMap.contents.entrySet()); if (target == State.SESSION_INITIALIZED_PRE_APPROVED) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": automatically accepting session-initiate"); sendSessionAccept(); } else { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received not pre-approved session-initiate. start ringing"); startRinging(); } } else { Log.d(Config.LOGTAG, String.format("%s: received session-initiate while in state %s", id.account.getJid().asBareJid(), state)); terminateWithOutOfOrder(jinglePacket); } } private void receiveSessionAccept(final JinglePacket jinglePacket) { if (!isInitiator()) { Log.d(Config.LOGTAG, String.format("%s: received session-accept even though we were responding", id.account.getJid().asBareJid())); terminateWithOutOfOrder(jinglePacket); return; } final RtpContentMap contentMap; try { contentMap = receiveRtpContentMap(jinglePacket, this.omemoVerification.hasFingerprint()); contentMap.requireContentDescriptions(); contentMap.requireDTLSFingerprint(); } catch (final RuntimeException e) { respondOk(jinglePacket); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": improperly formatted contents in session-accept", e); webRTCWrapper.close(); sendSessionTerminate(Reason.of(e), e.getMessage()); return; } final Set initiatorMedia = this.initiatorRtpContentMap.getMedia(); if (!initiatorMedia.equals(contentMap.getMedia())) { sendSessionTerminate(Reason.SECURITY_ERROR, String.format( "Your session-included included media %s but our session-initiate was %s", this.proposedMedia, contentMap.getMedia() )); return; } Log.d(Config.LOGTAG, "processing session-accept with " + contentMap.contents.size() + " contents"); if (transition(State.SESSION_ACCEPTED)) { respondOk(jinglePacket); receiveSessionAccept(contentMap); } else { Log.d(Config.LOGTAG, String.format("%s: received session-accept while in state %s", id.account.getJid().asBareJid(), state)); respondOk(jinglePacket); } } private void receiveSessionAccept(final RtpContentMap contentMap) { this.responderRtpContentMap = contentMap; final SessionDescription sessionDescription; try { sessionDescription = SessionDescription.of(contentMap); } catch (final IllegalArgumentException | NullPointerException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable convert offer from session-accept to SDP", e); webRTCWrapper.close(); sendSessionTerminate(Reason.FAILED_APPLICATION, e.getMessage()); return; } final org.webrtc.SessionDescription answer = new org.webrtc.SessionDescription( org.webrtc.SessionDescription.Type.ANSWER, sessionDescription.toString() ); try { this.webRTCWrapper.setRemoteDescription(answer).get(); } catch (final Exception e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to set remote description after receiving session-accept", Throwables.getRootCause(e)); webRTCWrapper.close(); sendSessionTerminate(Reason.FAILED_APPLICATION); return; } final List identificationTags = contentMap.group == null ? contentMap.getNames() : contentMap.group.getIdentificationTags(); processCandidates(identificationTags, contentMap.contents.entrySet()); } private void sendSessionAccept() { final RtpContentMap rtpContentMap = this.initiatorRtpContentMap; if (rtpContentMap == null) { throw new IllegalStateException("initiator RTP Content Map has not been set"); } final SessionDescription offer; try { offer = SessionDescription.of(rtpContentMap); } catch (final IllegalArgumentException | NullPointerException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable convert offer from session-initiate to SDP", e); webRTCWrapper.close(); sendSessionTerminate(Reason.FAILED_APPLICATION, e.getMessage()); return; } sendSessionAccept(rtpContentMap.getMedia(), offer); } private void sendSessionAccept(final Set media, final SessionDescription offer) { discoverIceServers(iceServers -> sendSessionAccept(media, offer, iceServers)); } private synchronized void sendSessionAccept(final Set media, final SessionDescription offer, final List iceServers) { if (isTerminated()) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": ICE servers got discovered when session was already terminated. nothing to do."); return; } try { setupWebRTC(media, iceServers); } catch (final WebRTCWrapper.InitializationException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to initialize WebRTC"); webRTCWrapper.close(); sendSessionTerminate(Reason.FAILED_APPLICATION); return; } final org.webrtc.SessionDescription sdp = new org.webrtc.SessionDescription( org.webrtc.SessionDescription.Type.OFFER, offer.toString() ); try { this.webRTCWrapper.setRemoteDescription(sdp).get(); addIceCandidatesFromBlackLog(); org.webrtc.SessionDescription webRTCSessionDescription = this.webRTCWrapper.createAnswer().get(); final SessionDescription sessionDescription = SessionDescription.parse(webRTCSessionDescription.description); final RtpContentMap respondingRtpContentMap = RtpContentMap.of(sessionDescription); sendSessionAccept(respondingRtpContentMap); this.webRTCWrapper.setLocalDescription(webRTCSessionDescription).get(); } catch (final Exception e) { Log.d(Config.LOGTAG, "unable to send session accept", Throwables.getRootCause(e)); webRTCWrapper.close(); sendSessionTerminate(Reason.FAILED_APPLICATION); } } private void addIceCandidatesFromBlackLog() { while (!this.pendingIceCandidates.isEmpty()) { processCandidates(this.pendingIceCandidates.poll()); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": added candidates from back log"); } } private void sendSessionAccept(final RtpContentMap rtpContentMap) { this.responderRtpContentMap = rtpContentMap; this.transitionOrThrow(State.SESSION_ACCEPTED); final RtpContentMap outgoingContentMap; if (this.omemoVerification.hasDeviceId()) { final AxolotlService.OmemoVerifiedPayload verifiedPayload; try { verifiedPayload = id.account.getAxolotlService().encrypt(rtpContentMap, id.with, omemoVerification.getDeviceId()); outgoingContentMap = verifiedPayload.getPayload(); this.omemoVerification.setOrEnsureEqual(verifiedPayload); } catch (final Exception e) { throw new SecurityException("Unable to verify DTLS Fingerprint with OMEMO", e); } } else { outgoingContentMap = rtpContentMap; } final JinglePacket sessionAccept = outgoingContentMap.toJinglePacket(JinglePacket.Action.SESSION_ACCEPT, id.sessionId); send(sessionAccept); } synchronized void deliveryMessage(final Jid from, final Element message, final String serverMessageId, final long timestamp) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": delivered message to JingleRtpConnection " + message); switch (message.getName()) { case "propose": receivePropose(from, Propose.upgrade(message), serverMessageId, timestamp); break; case "proceed": receiveProceed(from, Proceed.upgrade(message), serverMessageId, timestamp); break; case "retract": receiveRetract(from, serverMessageId, timestamp); break; case "reject": receiveReject(from, serverMessageId, timestamp); break; case "accept": receiveAccept(from, serverMessageId, timestamp); break; default: break; } } void deliverFailedProceed() { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": receive message error for proceed message"); if (transition(State.TERMINATED_CONNECTIVITY_ERROR)) { webRTCWrapper.close(); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": transitioned into connectivity error"); this.finish(); } } private void receiveAccept(final Jid from, final String serverMsgId, final long timestamp) { final boolean originatedFromMyself = from.asBareJid().equals(id.account.getJid().asBareJid()); if (originatedFromMyself) { if (transition(State.ACCEPTED)) { if (serverMsgId != null) { this.message.setServerMsgId(serverMsgId); } this.message.setTime(timestamp); this.message.setCarbon(true); //indicate that call was accepted on other device this.writeLogMessageSuccess(0); this.xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); this.finish(); } else { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to transition to accept because already in state=" + this.state); } } else { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring 'accept' from " + from); } } private void receiveReject(final Jid from, final String serverMsgId, final long timestamp) { final boolean originatedFromMyself = from.asBareJid().equals(id.account.getJid().asBareJid()); //reject from another one of my clients if (originatedFromMyself) { receiveRejectFromMyself(serverMsgId, timestamp); } else if (isInitiator()) { if (from.equals(id.with)) { receiveRejectFromResponder(); } else { Log.d(Config.LOGTAG, id.account.getJid() + ": ignoring reject from " + from + " for session with " + id.with); } } else { Log.d(Config.LOGTAG, id.account.getJid() + ": ignoring reject from " + from + " for session with " + id.with); } } private void receiveRejectFromMyself(String serverMsgId, long timestamp) { if (transition(State.REJECTED)) { this.xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); this.finish(); if (serverMsgId != null) { this.message.setServerMsgId(serverMsgId); } this.message.setTime(timestamp); this.message.setCarbon(true); //indicate that call was rejected on other device writeLogMessageMissed(); } else { Log.d(Config.LOGTAG, "not able to transition into REJECTED because already in " + this.state); } } private void receiveRejectFromResponder() { if (isInState(State.PROCEED)) { Log.d(Config.LOGTAG, id.account.getJid() + ": received reject while still in proceed. callee reconsidered"); closeTransitionLogFinish(State.REJECTED_RACED); return; } if (isInState(State.SESSION_INITIALIZED_PRE_APPROVED)) { Log.d(Config.LOGTAG, id.account.getJid() + ": received reject while in SESSION_INITIATED_PRE_APPROVED. callee reconsidered before receiving session-init"); closeTransitionLogFinish(State.TERMINATED_DECLINED_OR_BUSY); return; } Log.d(Config.LOGTAG, id.account.getJid() + ": ignoring reject from responder because already in state " + this.state); } private void receivePropose(final Jid from, final Propose propose, final String serverMsgId, final long timestamp) { final boolean originatedFromMyself = from.asBareJid().equals(id.account.getJid().asBareJid()); if (originatedFromMyself) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": saw proposal from myself. ignoring"); } else if (transition(State.PROPOSED, () -> { final Collection descriptions = Collections2.transform( Collections2.filter(propose.getDescriptions(), d -> d instanceof RtpDescription), input -> (RtpDescription) input ); final Collection media = Collections2.transform(descriptions, RtpDescription::getMedia); Preconditions.checkState(!media.contains(Media.UNKNOWN), "RTP descriptions contain unknown media"); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received session proposal from " + from + " for " + media); this.proposedMedia = Sets.newHashSet(media); })) { if (serverMsgId != null) { this.message.setServerMsgId(serverMsgId); } this.message.setTime(timestamp); startRinging(); } else { Log.d(Config.LOGTAG, id.account.getJid() + ": ignoring session proposal because already in " + state); } } private void startRinging() { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received call from " + id.with + ". start ringing"); ringingTimeoutFuture = jingleConnectionManager.schedule(this::ringingTimeout, BUSY_TIME_OUT, TimeUnit.SECONDS); xmppConnectionService.getNotificationService().startRinging(id, getMedia()); } private synchronized void ringingTimeout() { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": timeout reached for ringing"); switch (this.state) { case PROPOSED: message.markUnread(); rejectCallFromProposed(); break; case SESSION_INITIALIZED: message.markUnread(); rejectCallFromSessionInitiate(); break; } } private void cancelRingingTimeout() { final ScheduledFuture future = this.ringingTimeoutFuture; if (future != null && !future.isCancelled()) { future.cancel(false); } } private void receiveProceed(final Jid from, final Proceed proceed, final String serverMsgId, final long timestamp) { final Set media = Preconditions.checkNotNull(this.proposedMedia, "Proposed media has to be set before handling proceed"); Preconditions.checkState(media.size() > 0, "Proposed media should not be empty"); if (from.equals(id.with)) { if (isInitiator()) { if (transition(State.PROCEED)) { if (serverMsgId != null) { this.message.setServerMsgId(serverMsgId); } this.message.setTime(timestamp); this.omemoVerification.setDeviceId(proceed.getDeviceId()); this.sendSessionInitiate(media, State.SESSION_INITIALIZED_PRE_APPROVED); } else { Log.d(Config.LOGTAG, String.format("%s: ignoring proceed because already in %s", id.account.getJid().asBareJid(), this.state)); } } else { Log.d(Config.LOGTAG, String.format("%s: ignoring proceed because we were not initializing", id.account.getJid().asBareJid())); } } else if (from.asBareJid().equals(id.account.getJid().asBareJid())) { if (transition(State.ACCEPTED)) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": moved session with " + id.with + " into state accepted after received carbon copied procced"); this.xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); this.finish(); } } else { Log.d(Config.LOGTAG, String.format("%s: ignoring proceed from %s. was expected from %s", id.account.getJid().asBareJid(), from, id.with)); } } private void receiveRetract(final Jid from, final String serverMsgId, final long timestamp) { if (from.equals(id.with)) { final State target = this.state == State.PROCEED ? State.RETRACTED_RACED : State.RETRACTED; if (transition(target)) { xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": session with " + id.with + " has been retracted (serverMsgId=" + serverMsgId + ")"); if (serverMsgId != null) { this.message.setServerMsgId(serverMsgId); } this.message.setTime(timestamp); if (target == State.RETRACTED) { this.message.markUnread(); } writeLogMessageMissed(); finish(); } else { Log.d(Config.LOGTAG, "ignoring retract because already in " + this.state); } } else { //TODO parse retract from self Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received retract from " + from + ". expected retract from" + id.with + ". ignoring"); } } public void sendSessionInitiate() { sendSessionInitiate(this.proposedMedia, State.SESSION_INITIALIZED); } private void sendSessionInitiate(final Set media, final State targetState) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": prepare session-initiate"); discoverIceServers(iceServers -> sendSessionInitiate(media, targetState, iceServers)); } private synchronized void sendSessionInitiate(final Set media, final State targetState, final List iceServers) { if (isTerminated()) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": ICE servers got discovered when session was already terminated. nothing to do."); return; } try { setupWebRTC(media, iceServers); } catch (final WebRTCWrapper.InitializationException e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to initialize WebRTC"); webRTCWrapper.close(); sendJingleMessage("retract", id.with.asBareJid()); transitionOrThrow(State.TERMINATED_APPLICATION_FAILURE); this.finish(); return; } try { org.webrtc.SessionDescription webRTCSessionDescription = this.webRTCWrapper.createOffer().get(); final SessionDescription sessionDescription = SessionDescription.parse(webRTCSessionDescription.description); final RtpContentMap rtpContentMap = RtpContentMap.of(sessionDescription); sendSessionInitiate(rtpContentMap, targetState); this.webRTCWrapper.setLocalDescription(webRTCSessionDescription).get(); } catch (final Exception e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to sendSessionInitiate", Throwables.getRootCause(e)); webRTCWrapper.close(); if (isInState(targetState)) { sendSessionTerminate(Reason.FAILED_APPLICATION); } else { sendJingleMessage("retract", id.with.asBareJid()); transitionOrThrow(State.TERMINATED_APPLICATION_FAILURE); this.finish(); } } } private void sendSessionInitiate(final RtpContentMap rtpContentMap, final State targetState) { this.initiatorRtpContentMap = rtpContentMap; this.transitionOrThrow(targetState); //TODO do on background thread? final RtpContentMap outgoingContentMap = encryptSessionInitiate(rtpContentMap); final JinglePacket sessionInitiate = outgoingContentMap.toJinglePacket(JinglePacket.Action.SESSION_INITIATE, id.sessionId); send(sessionInitiate); } private RtpContentMap encryptSessionInitiate(final RtpContentMap rtpContentMap) { if (this.omemoVerification.hasDeviceId()) { final AxolotlService.OmemoVerifiedPayload verifiedPayload; try { verifiedPayload = id.account.getAxolotlService().encrypt(rtpContentMap, id.with, omemoVerification.getDeviceId()); } catch (final CryptoFailedException e) { Log.w(Config.LOGTAG,id.account.getJid().asBareJid()+": unable to use OMEMO DTLS verification on outgoing session initiate. falling back", e); return rtpContentMap; } this.omemoVerification.setSessionFingerprint(verifiedPayload.getFingerprint()); return verifiedPayload.getPayload(); } else { return rtpContentMap; } } private void sendSessionTerminate(final Reason reason) { sendSessionTerminate(reason, null); } private void sendSessionTerminate(final Reason reason, final String text) { final State previous = this.state; final State target = reasonToState(reason); transitionOrThrow(target); if (previous != State.NULL) { writeLogMessage(target); } final JinglePacket jinglePacket = new JinglePacket(JinglePacket.Action.SESSION_TERMINATE, id.sessionId); jinglePacket.setReason(reason, text); Log.d(Config.LOGTAG, jinglePacket.toString()); send(jinglePacket); finish(); } private void sendTransportInfo(final String contentName, IceUdpTransportInfo.Candidate candidate) { final RtpContentMap transportInfo; try { final RtpContentMap rtpContentMap = isInitiator() ? this.initiatorRtpContentMap : this.responderRtpContentMap; transportInfo = rtpContentMap.transportInfo(contentName, candidate); } catch (final Exception e) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": unable to prepare transport-info from candidate for content=" + contentName); return; } final JinglePacket jinglePacket = transportInfo.toJinglePacket(JinglePacket.Action.TRANSPORT_INFO, id.sessionId); send(jinglePacket); } private void send(final JinglePacket jinglePacket) { jinglePacket.setTo(id.with); xmppConnectionService.sendIqPacket(id.account, jinglePacket, this::handleIqResponse); } private synchronized void handleIqResponse(final Account account, final IqPacket response) { if (response.getType() == IqPacket.TYPE.ERROR) { final String errorCondition = response.getErrorCondition(); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received IQ-error from " + response.getFrom() + " in RTP session. " + errorCondition); if (isTerminated()) { Log.i(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring error because session was already terminated"); return; } this.webRTCWrapper.close(); final State target; if (Arrays.asList( "service-unavailable", "recipient-unavailable", "remote-server-not-found", "remote-server-timeout" ).contains(errorCondition)) { target = State.TERMINATED_CONNECTIVITY_ERROR; } else { target = State.TERMINATED_APPLICATION_FAILURE; } transitionOrThrow(target); this.finish(); } else if (response.getType() == IqPacket.TYPE.TIMEOUT) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": received IQ timeout in RTP session with " + id.with + ". terminating with connectivity error"); if (isTerminated()) { Log.i(Config.LOGTAG, id.account.getJid().asBareJid() + ": ignoring error because session was already terminated"); return; } this.webRTCWrapper.close(); transitionOrThrow(State.TERMINATED_CONNECTIVITY_ERROR); this.finish(); } } private void terminateWithOutOfOrder(final JinglePacket jinglePacket) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": terminating session with out-of-order"); this.webRTCWrapper.close(); transitionOrThrow(State.TERMINATED_APPLICATION_FAILURE); respondWithOutOfOrder(jinglePacket); this.finish(); } private void respondWithOutOfOrder(final JinglePacket jinglePacket) { jingleConnectionManager.respondWithJingleError(id.account, jinglePacket, "out-of-order", "unexpected-request", "wait"); } private void respondOk(final JinglePacket jinglePacket) { xmppConnectionService.sendIqPacket(id.account, jinglePacket.generateResponse(IqPacket.TYPE.RESULT), null); } public void throwStateTransitionException() { final StateTransitionException exception = this.stateTransitionException; if (exception != null) { throw new IllegalStateException(String.format("Transition to %s did not call finish", exception.state), exception); } } public RtpEndUserState getEndUserState() { switch (this.state) { case NULL: case PROPOSED: case SESSION_INITIALIZED: if (isInitiator()) { return RtpEndUserState.RINGING; } else { return RtpEndUserState.INCOMING_CALL; } case PROCEED: if (isInitiator()) { return RtpEndUserState.RINGING; } else { return RtpEndUserState.ACCEPTING_CALL; } case SESSION_INITIALIZED_PRE_APPROVED: if (isInitiator()) { return RtpEndUserState.RINGING; } else { return RtpEndUserState.CONNECTING; } case SESSION_ACCEPTED: final PeerConnection.PeerConnectionState state; try { state = webRTCWrapper.getState(); } catch (final WebRTCWrapper.PeerConnectionNotInitialized e) { //We usually close the WebRTCWrapper *before* transitioning so we might still //be in SESSION_ACCEPTED even though the peerConnection has been torn down return RtpEndUserState.ENDING_CALL; } if (state == PeerConnection.PeerConnectionState.CONNECTED) { return RtpEndUserState.CONNECTED; } else if (state == PeerConnection.PeerConnectionState.NEW || state == PeerConnection.PeerConnectionState.CONNECTING) { return RtpEndUserState.CONNECTING; } else if (state == PeerConnection.PeerConnectionState.CLOSED) { return RtpEndUserState.ENDING_CALL; } else { return rtpConnectionStarted == 0 ? RtpEndUserState.CONNECTIVITY_ERROR : RtpEndUserState.CONNECTIVITY_LOST_ERROR; } case REJECTED: case REJECTED_RACED: case TERMINATED_DECLINED_OR_BUSY: if (isInitiator()) { return RtpEndUserState.DECLINED_OR_BUSY; } else { return RtpEndUserState.ENDED; } case TERMINATED_SUCCESS: case ACCEPTED: case RETRACTED: case TERMINATED_CANCEL_OR_TIMEOUT: return RtpEndUserState.ENDED; case RETRACTED_RACED: if (isInitiator()) { return RtpEndUserState.ENDED; } else { return RtpEndUserState.RETRACTED; } case TERMINATED_CONNECTIVITY_ERROR: return rtpConnectionStarted == 0 ? RtpEndUserState.CONNECTIVITY_ERROR : RtpEndUserState.CONNECTIVITY_LOST_ERROR; case TERMINATED_APPLICATION_FAILURE: return RtpEndUserState.APPLICATION_ERROR; } throw new IllegalStateException(String.format("%s has no equivalent EndUserState", this.state)); } public Set getMedia() { final State current = getState(); if (current == State.NULL) { if (isInitiator()) { return Preconditions.checkNotNull( this.proposedMedia, "RTP connection has not been initialized properly" ); } throw new IllegalStateException("RTP connection has not been initialized yet"); } if (Arrays.asList(State.PROPOSED, State.PROCEED).contains(current)) { return Preconditions.checkNotNull( this.proposedMedia, "RTP connection has not been initialized properly" ); } final RtpContentMap initiatorContentMap = initiatorRtpContentMap; if (initiatorContentMap != null) { return initiatorContentMap.getMedia(); } else if (isTerminated()) { return Collections.emptySet(); //we might fail before we ever got a chance to set media } else { return Preconditions.checkNotNull(this.proposedMedia, "RTP connection has not been initialized properly"); } } public boolean isVerified() { final String fingerprint = this.omemoVerification.getFingerprint(); if (fingerprint == null) { return false; } final FingerprintStatus status = id.account.getAxolotlService().getFingerprintTrust(fingerprint); return status != null && status.getTrust() == FingerprintStatus.Trust.VERIFIED; } public synchronized void acceptCall() { switch (this.state) { case PROPOSED: cancelRingingTimeout(); acceptCallFromProposed(); break; case SESSION_INITIALIZED: cancelRingingTimeout(); acceptCallFromSessionInitialized(); break; case ACCEPTED: Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": the call has already been accepted with another client. UI was just lagging behind"); break; case PROCEED: case SESSION_ACCEPTED: Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": the call has already been accepted. user probably double tapped the UI"); break; default: throw new IllegalStateException("Can not accept call from " + this.state); } } public void notifyPhoneCall() { Log.d(Config.LOGTAG, "a phone call has just been started. killing jingle rtp connections"); if (Arrays.asList(State.PROPOSED, State.SESSION_INITIALIZED).contains(this.state)) { rejectCall(); } else { endCall(); } } public synchronized void rejectCall() { if (isTerminated()) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": received rejectCall() when session has already been terminated. nothing to do"); return; } switch (this.state) { case PROPOSED: rejectCallFromProposed(); break; case SESSION_INITIALIZED: rejectCallFromSessionInitiate(); break; default: throw new IllegalStateException("Can not reject call from " + this.state); } } public synchronized void endCall() { if (isTerminated()) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": received endCall() when session has already been terminated. nothing to do"); return; } if (isInState(State.PROPOSED) && !isInitiator()) { rejectCallFromProposed(); return; } if (isInState(State.PROCEED)) { if (isInitiator()) { retractFromProceed(); } else { rejectCallFromProceed(); } return; } if (isInitiator() && isInState(State.SESSION_INITIALIZED, State.SESSION_INITIALIZED_PRE_APPROVED)) { this.webRTCWrapper.close(); sendSessionTerminate(Reason.CANCEL); return; } if (isInState(State.SESSION_INITIALIZED)) { rejectCallFromSessionInitiate(); return; } if (isInState(State.SESSION_INITIALIZED_PRE_APPROVED, State.SESSION_ACCEPTED)) { this.webRTCWrapper.close(); sendSessionTerminate(Reason.SUCCESS); return; } if (isInState(State.TERMINATED_APPLICATION_FAILURE, State.TERMINATED_CONNECTIVITY_ERROR, State.TERMINATED_DECLINED_OR_BUSY)) { Log.d(Config.LOGTAG, "ignoring request to end call because already in state " + this.state); return; } throw new IllegalStateException("called 'endCall' while in state " + this.state + ". isInitiator=" + isInitiator()); } private void retractFromProceed() { Log.d(Config.LOGTAG, "retract from proceed"); this.sendJingleMessage("retract"); closeTransitionLogFinish(State.RETRACTED_RACED); } private void closeTransitionLogFinish(final State state) { this.webRTCWrapper.close(); transitionOrThrow(state); writeLogMessage(state); finish(); } private void setupWebRTC(final Set media, final List iceServers) throws WebRTCWrapper.InitializationException { this.jingleConnectionManager.ensureConnectionIsRegistered(this); final AppRTCAudioManager.SpeakerPhonePreference speakerPhonePreference; if (media.contains(Media.VIDEO)) { speakerPhonePreference = AppRTCAudioManager.SpeakerPhonePreference.SPEAKER; } else { speakerPhonePreference = AppRTCAudioManager.SpeakerPhonePreference.EARPIECE; } this.webRTCWrapper.setup(this.xmppConnectionService, speakerPhonePreference); this.webRTCWrapper.initializePeerConnection(media, iceServers); } private void acceptCallFromProposed() { transitionOrThrow(State.PROCEED); xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); this.sendJingleMessage("accept", id.account.getJid().asBareJid()); this.sendJingleMessage("proceed"); } private void rejectCallFromProposed() { transitionOrThrow(State.REJECTED); writeLogMessageMissed(); xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); this.sendJingleMessage("reject"); finish(); } private void rejectCallFromProceed() { this.sendJingleMessage("reject"); closeTransitionLogFinish(State.REJECTED_RACED); } private void rejectCallFromSessionInitiate() { webRTCWrapper.close(); sendSessionTerminate(Reason.DECLINE); xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); } private void sendJingleMessage(final String action) { sendJingleMessage(action, id.with); } private void sendJingleMessage(final String action, final Jid to) { final MessagePacket messagePacket = new MessagePacket(); messagePacket.setType(MessagePacket.TYPE_CHAT); //we want to carbon copy those messagePacket.setTo(to); final Element intent = messagePacket.addChild(action, Namespace.JINGLE_MESSAGE).setAttribute("id", id.sessionId); if ("proceed".equals(action)) { messagePacket.setId(JINGLE_MESSAGE_PROCEED_ID_PREFIX + id.sessionId); //TODO only do this if OMEMO is enable so we have an easy way to opt out final int deviceId = id.account.getAxolotlService().getOwnDeviceId(); final Element device = intent.addChild("device", Namespace.OMEMO_DTLS_SRTP_VERIFICATION); device.setAttribute("id", deviceId); } messagePacket.addChild("store", "urn:xmpp:hints"); xmppConnectionService.sendMessagePacket(id.account, messagePacket); } private void acceptCallFromSessionInitialized() { xmppConnectionService.getNotificationService().cancelIncomingCallNotification(); sendSessionAccept(); } private synchronized boolean isInState(State... state) { return Arrays.asList(state).contains(this.state); } private boolean transition(final State target) { return transition(target, null); } private synchronized boolean transition(final State target, final Runnable runnable) { final Collection validTransitions = VALID_TRANSITIONS.get(this.state); if (validTransitions != null && validTransitions.contains(target)) { this.state = target; this.stateTransitionException = new StateTransitionException(target); if (runnable != null) { runnable.run(); } Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": transitioned into " + target); updateEndUserState(); updateOngoingCallNotification(); return true; } else { return false; } } void transitionOrThrow(final State target) { if (!transition(target)) { throw new IllegalStateException(String.format("Unable to transition from %s to %s", this.state, target)); } } @Override public void onIceCandidate(final IceCandidate iceCandidate) { final IceUdpTransportInfo.Candidate candidate = IceUdpTransportInfo.Candidate.fromSdpAttribute(iceCandidate.sdp); Log.d(Config.LOGTAG, "sending candidate: " + iceCandidate.toString()); sendTransportInfo(iceCandidate.sdpMid, candidate); } @Override public void onConnectionChange(final PeerConnection.PeerConnectionState newState) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": PeerConnectionState changed to " + newState); if (newState == PeerConnection.PeerConnectionState.CONNECTED && this.rtpConnectionStarted == 0) { this.rtpConnectionStarted = SystemClock.elapsedRealtime(); } if (newState == PeerConnection.PeerConnectionState.CLOSED && this.rtpConnectionEnded == 0) { this.rtpConnectionEnded = SystemClock.elapsedRealtime(); } //TODO 'DISCONNECTED' might be an opportunity to renew the offer and send a transport-replace //TODO exact syntax is yet to be determined but transport-replace sounds like the most reasonable //as there is no content-replace if (Arrays.asList(PeerConnection.PeerConnectionState.FAILED, PeerConnection.PeerConnectionState.DISCONNECTED).contains(newState)) { if (isTerminated()) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": not sending session-terminate after connectivity error because session is already in state " + this.state); return; } new Thread(this::closeWebRTCSessionAfterFailedConnection).start(); } else { updateEndUserState(); } } private void closeWebRTCSessionAfterFailedConnection() { this.webRTCWrapper.close(); synchronized (this) { if (isTerminated()) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": no need to send session-terminate after failed connection. Other party already did"); return; } sendSessionTerminate(Reason.CONNECTIVITY_ERROR); } } public long getRtpConnectionStarted() { return this.rtpConnectionStarted; } public long getRtpConnectionEnded() { return this.rtpConnectionEnded; } public AppRTCAudioManager getAudioManager() { return webRTCWrapper.getAudioManager(); } public boolean isMicrophoneEnabled() { return webRTCWrapper.isMicrophoneEnabled(); } public boolean setMicrophoneEnabled(final boolean enabled) { return webRTCWrapper.setMicrophoneEnabled(enabled); } public boolean isVideoEnabled() { return webRTCWrapper.isVideoEnabled(); } public void setVideoEnabled(final boolean enabled) { webRTCWrapper.setVideoEnabled(enabled); } public boolean isCameraSwitchable() { return webRTCWrapper.isCameraSwitchable(); } public boolean isFrontCamera() { return webRTCWrapper.isFrontCamera(); } public ListenableFuture switchCamera() { return webRTCWrapper.switchCamera(); } @Override public void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set availableAudioDevices) { xmppConnectionService.notifyJingleRtpConnectionUpdate(selectedAudioDevice, availableAudioDevices); } private void updateEndUserState() { final RtpEndUserState endUserState = getEndUserState(); jingleConnectionManager.toneManager.transition(isInitiator(), endUserState, getMedia()); xmppConnectionService.notifyJingleRtpConnectionUpdate(id.account, id.with, id.sessionId, endUserState); } private void updateOngoingCallNotification() { if (STATES_SHOWING_ONGOING_CALL.contains(this.state)) { xmppConnectionService.setOngoingCall(id, getMedia()); } else { xmppConnectionService.removeOngoingCall(); } } private void discoverIceServers(final OnIceServersDiscovered onIceServersDiscovered) { if (id.account.getXmppConnection().getFeatures().externalServiceDiscovery()) { final IqPacket request = new IqPacket(IqPacket.TYPE.GET); request.setTo(id.account.getDomain()); request.addChild("services", Namespace.EXTERNAL_SERVICE_DISCOVERY); xmppConnectionService.sendIqPacket(id.account, request, (account, response) -> { ImmutableList.Builder listBuilder = new ImmutableList.Builder<>(); if (response.getType() == IqPacket.TYPE.RESULT) { final Element services = response.findChild("services", Namespace.EXTERNAL_SERVICE_DISCOVERY); final List children = services == null ? Collections.emptyList() : services.getChildren(); for (final Element child : children) { if ("service".equals(child.getName())) { final String type = child.getAttribute("type"); final String host = child.getAttribute("host"); final String sport = child.getAttribute("port"); final Integer port = sport == null ? null : Ints.tryParse(sport); final String transport = child.getAttribute("transport"); final String username = child.getAttribute("username"); final String password = child.getAttribute("password"); if (Strings.isNullOrEmpty(host) || port == null) { continue; } if (port < 0 || port > 65535) { continue; } if (Arrays.asList("stun", "stuns", "turn", "turns").contains(type) && Arrays.asList("udp", "tcp").contains(transport)) { if (Arrays.asList("stuns", "turns").contains(type) && "udp".equals(transport)) { Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": skipping invalid combination of udp/tls in external services"); continue; } final PeerConnection.IceServer.Builder iceServerBuilder = PeerConnection.IceServer .builder(String.format("%s:%s:%s?transport=%s", type, IP.wrapIPv6(host), port, transport)); iceServerBuilder.setTlsCertPolicy(PeerConnection.TlsCertPolicy.TLS_CERT_POLICY_INSECURE_NO_CHECK); if (username != null && password != null) { iceServerBuilder.setUsername(username); iceServerBuilder.setPassword(password); } else if (Arrays.asList("turn", "turns").contains(type)) { //The WebRTC spec requires throwing an InvalidAccessError when username (from libwebrtc source coder) //https://chromium.googlesource.com/external/webrtc/+/master/pc/ice_server_parsing.cc Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": skipping " + type + "/" + transport + " without username and password"); continue; } final PeerConnection.IceServer iceServer = iceServerBuilder.createIceServer(); Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": discovered ICE Server: " + iceServer); listBuilder.add(iceServer); } } } } final List iceServers = listBuilder.build(); if (iceServers.size() == 0) { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": no ICE server found " + response); } onIceServersDiscovered.onIceServersDiscovered(iceServers); }); } else { Log.w(Config.LOGTAG, id.account.getJid().asBareJid() + ": has no external service discovery"); onIceServersDiscovered.onIceServersDiscovered(Collections.emptyList()); } } private void finish() { if (isTerminated()) { this.cancelRingingTimeout(); this.webRTCWrapper.verifyClosed(); this.jingleConnectionManager.setTerminalSessionState(id, getEndUserState(), getMedia()); this.jingleConnectionManager.finishConnectionOrThrow(this); } else { throw new IllegalStateException(String.format("Unable to call finish from %s", this.state)); } } private void writeLogMessage(final State state) { final long started = this.rtpConnectionStarted; long duration = started <= 0 ? 0 : SystemClock.elapsedRealtime() - started; if (state == State.TERMINATED_SUCCESS || (state == State.TERMINATED_CONNECTIVITY_ERROR && duration > 0)) { writeLogMessageSuccess(duration); } else { writeLogMessageMissed(); } } private void writeLogMessageSuccess(final long duration) { this.message.setBody(new RtpSessionStatus(true, duration).toString()); this.writeMessage(); } private void writeLogMessageMissed() { this.message.setBody(new RtpSessionStatus(false, 0).toString()); this.writeMessage(); } private void writeMessage() { final Conversational conversational = message.getConversation(); if (conversational instanceof Conversation) { ((Conversation) conversational).add(this.message); xmppConnectionService.createMessageAsync(message); xmppConnectionService.updateConversationUi(); } else { throw new IllegalStateException("Somehow the conversation in a message was a stub"); } } public State getState() { return this.state; } boolean isTerminated() { return TERMINATED.contains(this.state); } public Optional getLocalVideoTrack() { return webRTCWrapper.getLocalVideoTrack(); } public Optional getRemoteVideoTrack() { return webRTCWrapper.getRemoteVideoTrack(); } public EglBase.Context getEglBaseContext() { return webRTCWrapper.getEglBaseContext(); } void setProposedMedia(final Set media) { this.proposedMedia = media; } public void fireStateUpdate() { final RtpEndUserState endUserState = getEndUserState(); xmppConnectionService.notifyJingleRtpConnectionUpdate(id.account, id.with, id.sessionId, endUserState); } private interface OnIceServersDiscovered { void onIceServersDiscovered(List iceServers); } private static class StateTransitionException extends Exception { private final State state; private StateTransitionException(final State state) { this.state = state; } } }