simple-peer-temasys-wrtc.js

//Use for SimplePeers wrtc property.
//Optionally, register your onStream handler here if needed. It won't return the stream, but it is when the audio/video starts playing.
//Needed for https://github.com/Temasys/AdapterJS/issues/59
(onStream) => ({
    RTCPeerConnection: (() => {
        //From https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection
        const underlyingProperties = ["addIceCandidate", "addStream", "addTrack", "addTransceiver", "close", "createAnswer", "createDTMFSender", "createDataChannel", "createOffer", "currentLocalDescription", "currentRemoteDescription", "getConfiguration", "getLocalStreams", "getReceivers", "getRemoteStreams", "getSenders", "getStats", "getTransceivers", "iceConnectionState", "iceGatheringState", "localDescription", "onaddstream", "ondatachannel", "onicecandidate", "oniceconnectionstatechange", "onicegatheringstatechange", "onnegotiationneeded", "onremovestream", "onsignalingstatechange", "ontrack", "pendingLocalDescription", "pendingRemoteDescription", "remoteDescription", "removeStream", "removeTrack", "setConfiguration", "setLocalDescription", "setRemoteDescription", "signalingState"]

        return function(args){
            const _this = this;
            this.underlying = new window.RTCPeerConnection(...args);

            underlyingProperties.forEach(prop => Object.defineProperty(this, prop, {
                set: val => {
                    //Shiv for Temasys not running the onstream event and starting audio when the connection is made
                    switch(prop){
                        case 'oniceconnectionstatechange':
                        case 'onicegatheringstatechange':
                            val = (newFn => event => {
                                if(_this.underlying.iceConnectionState === 'connected' && onStream){
                                    onStream();
                                }
                                return newFn(event);
                            })(val);
                    }
                    _this.underlying[prop] = val;
                },
                get: () => {
                    const _this = this;
                    switch(prop){
                        case 'createOffer':
                            return constraints => new Promise((resolve, reject) => {
                                _this.underlying.createOffer.call(this, resolve, reject, constraints);
                            });
                        case 'createAnswer':
                            return constraints => new Promise((resolve, reject) => {
                                _this.underlying.createAnswer.call(this, resolve, reject, constraints);
                            });
                        case 'setLocalDescription':
                            return description => new Promise((resolve, reject) => {
                                _this.underlying.setLocalDescription.call(this, description, resolve, reject);
                            });
                        case 'setRemoteDescription':
                            return description => new Promise((resolve, reject) => {
                                _this.underlying.setRemoteDescription.call(this, description, resolve, reject);
                            });
                        case 'ontrack':
                            //This doesn't get called by Temasys, somehow the audio just magically plays
                            writeDebug('get ontrack');
                    }

                    return this.underlying[prop];
                }
            }));
        };
    })(),
    RTCSessionDescription: window.RTCSessionDescription,
    RTCIceCandidate: window.RTCIceCandidate
})

This was written to shim Temasys RTC support in IE11