TelepartyWebRTC.user.js

// ==UserScript==
// @name         Teleparty Video
// @version      0.1.2
// @description  Video RTC connection on TeleParty.
// @author       jrr6
// @match        https://www.netflix.com/watch/*
// @match        https://netflix.com/watch/*
// @icon         https://www.google.com/s2/favicons?domain=netflix.com
// @grant        none
// @downloadURL  https://gist.github.com/jrr6/9cb9e75fba7f7d3ef5fac308dab90539/raw/TelepartyWebRTC.user.js
// @updateURL    https://gist.github.com/jrr6/9cb9e75fba7f7d3ef5fac308dab90539/raw/TelepartyWebRTC.user.js
// ==/UserScript==

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MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */const a=e("debug")("simple-peer"),o=e("get-browser-rtc"),i=e("readable-stream"),d=e("queue-microtask"),s=e("err-code"),{Buffer:l}=e("buffer"),c=65536;class u extends i.Duplex{constructor(e){if(e=Object.assign({allowHalfOpen:!1},e),super(e),this._debug("new peer %o",e),this.channelName=e.initiator?e.channelName||"randombytesistupid!":null,this.initiator=e.initiator||!1,this.channelConfig=e.channelConfig||u.channelConfig,this.channelNegotiated=this.channelConfig.negotiated,this.config=Object.assign({},u.config,e.config),this.offerOptions=e.offerOptions||{},this.answerOptions=e.answerOptions||{},this.sdpTransform=e.sdpTransform||(e=>e),this.streams=e.streams||(e.stream?[e.stream]:[]),this.trickle=void 0===e.trickle||e.trickle,this.allowHalfTrickle=void 0!==e.allowHalfTrickle&&e.allowHalfTrickle,this.iceCompleteTimeout=e.iceCompleteTimeout||5000,this.destroyed=!1,this.destroying=!1,this._connected=!1,this.remoteAddress=void 0,this.remoteFamily=void 0,this.remotePort=void 0,this.localAddress=void 0,this.localFamily=void 0,this.localPort=void 0,this._wrtc=e.wrtc&&"object"==typeof e.wrtc?e.wrtc:o(),!this._wrtc)if("undefined"==typeof window)throw s(new Error("No WebRTC support: Specify `opts.wrtc` option in this environment"),"ERR_WEBRTC_SUPPORT");else throw s(new Error("No WebRTC support: Not a supported browser"),"ERR_WEBRTC_SUPPORT");this._pcReady=!1,this._channelReady=!1,this._iceComplete=!1,this._iceCompleteTimer=null,this._channel=null,this._pendingCandidates=[],this._isNegotiating=!1,this._firstNegotiation=!0,this._batchedNegotiation=!1,this._queuedNegotiation=!1,this._sendersAwaitingStable=[],this._senderMap=new Map,this._closingInterval=null,this._remoteTracks=[],this._remoteStreams=[],this._chunk=null,this._cb=null,this._interval=null;try{this._pc=new this._wrtc.RTCPeerConnection(this.config)}catch(e){return void this.destroy(s(e,"ERR_PC_CONSTRUCTOR"))}this._isReactNativeWebrtc="number"==typeof this._pc._peerConnectionId,this._pc.oniceconnectionstatechange=()=>{this._onIceStateChange()},this._pc.onicegatheringstatechange=()=>{this._onIceStateChange()},this._pc.onconnectionstatechange=()=>{this._onConnectionStateChange()},this._pc.onsignalingstatechange=()=>{this._onSignalingStateChange()},this._pc.onicecandidate=e=>{this._onIceCandidate(e)},"object"==typeof this._pc.peerIdentity&&this._pc.peerIdentity.catch(e=>{this.destroy(s(e,"ERR_PC_PEER_IDENTITY"))}),this.initiator||this.channelNegotiated?this._setupData({channel:this._pc.createDataChannel(this.channelName,this.channelConfig)}):this._pc.ondatachannel=e=>{this._setupData(e)},this.streams&&this.streams.forEach(e=>{this.addStream(e)}),this._pc.ontrack=e=>{this._onTrack(e)},this._debug("initial negotiation"),this._needsNegotiation(),this._onFinishBound=()=>{this._onFinish()},this.once("finish",this._onFinishBound)}get bufferSize(){return this._channel&&this._channel.bufferedAmount||0}get connected(){return this._connected&&"open"===this._channel.readyState}address(){return{port:this.localPort,family:this.localFamily,address:this.localAddress}}signal(e){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot signal after peer is destroyed"),"ERR_DESTROYED");if("string"==typeof e)try{e=JSON.parse(e)}catch(t){e={}}this._debug("signal()"),e.renegotiate&&this.initiator&&(this._debug("got request to renegotiate"),this._needsNegotiation()),e.transceiverRequest&&this.initiator&&(this._debug("got request for transceiver"),this.addTransceiver(e.transceiverRequest.kind,e.transceiverRequest.init)),e.candidate&&(this._pc.remoteDescription&&this._pc.remoteDescription.type?this._addIceCandidate(e.candidate):this._pendingCandidates.push(e.candidate)),e.sdp&&this._pc.setRemoteDescription(new this._wrtc.RTCSessionDescription(e)).then(()=>{this.destroyed||(this._pendingCandidates.forEach(e=>{this._addIceCandidate(e)}),this._pendingCandidates=[],"offer"===this._pc.remoteDescription.type&&this._createAnswer())}).catch(e=>{this.destroy(s(e,"ERR_SET_REMOTE_DESCRIPTION"))}),e.sdp||e.candidate||e.renegotiate||e.transceiverRequest||this.destroy(s(new Error("signal() called with invalid signal data"),"ERR_SIGNALING"))}}_addIceCandidate(e){const t=new this._wrtc.RTCIceCandidate(e);this._pc.addIceCandidate(t).catch(e=>{!t.address||t.address.endsWith(".local")?r("Ignoring unsupported ICE candidate."):this.destroy(s(e,"ERR_ADD_ICE_CANDIDATE"))})}send(e){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot send after peer is destroyed"),"ERR_DESTROYED");this._channel.send(e)}}addTransceiver(e,t){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot addTransceiver after peer is destroyed"),"ERR_DESTROYED");if(this._debug("addTransceiver()"),this.initiator)try{this._pc.addTransceiver(e,t),this._needsNegotiation()}catch(e){this.destroy(s(e,"ERR_ADD_TRANSCEIVER"))}else this.emit("signal",{type:"transceiverRequest",transceiverRequest:{kind:e,init:t}})}}addStream(e){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot addStream after peer is destroyed"),"ERR_DESTROYED");this._debug("addStream()"),e.getTracks().forEach(t=>{this.addTrack(t,e)})}}addTrack(e,t){if(this.destroying)return;if(this.destroyed)throw s(new Error("cannot addTrack after peer is destroyed"),"ERR_DESTROYED");this._debug("addTrack()");const n=this._senderMap.get(e)||new Map;let r=n.get(t);if(!r)r=this._pc.addTrack(e,t),n.set(t,r),this._senderMap.set(e,n),this._needsNegotiation();else if(r.removed)throw s(new Error("Track has been removed. You should enable/disable tracks that you want to re-add."),"ERR_SENDER_REMOVED");else throw s(new Error("Track has already been added to that stream."),"ERR_SENDER_ALREADY_ADDED")}replaceTrack(e,t,n){if(this.destroying)return;if(this.destroyed)throw s(new Error("cannot replaceTrack after peer is destroyed"),"ERR_DESTROYED");this._debug("replaceTrack()");const r=this._senderMap.get(e),a=r?r.get(n):null;if(!a)throw s(new Error("Cannot replace track that was never added."),"ERR_TRACK_NOT_ADDED");t&&this._senderMap.set(t,r),null==a.replaceTrack?this.destroy(s(new Error("replaceTrack is not supported in this browser"),"ERR_UNSUPPORTED_REPLACETRACK")):a.replaceTrack(t)}removeTrack(e,t){if(this.destroying)return;if(this.destroyed)throw s(new Error("cannot removeTrack after peer is destroyed"),"ERR_DESTROYED");this._debug("removeSender()");const n=this._senderMap.get(e),r=n?n.get(t):null;if(!r)throw s(new Error("Cannot remove track that was never added."),"ERR_TRACK_NOT_ADDED");try{r.removed=!0,this._pc.removeTrack(r)}catch(e){"NS_ERROR_UNEXPECTED"===e.name?this._sendersAwaitingStable.push(r):this.destroy(s(e,"ERR_REMOVE_TRACK"))}this._needsNegotiation()}removeStream(e){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot removeStream after peer is destroyed"),"ERR_DESTROYED");this._debug("removeSenders()"),e.getTracks().forEach(t=>{this.removeTrack(t,e)})}}_needsNegotiation(){this._debug("_needsNegotiation"),this._batchedNegotiation||(this._batchedNegotiation=!0,d(()=>{this._batchedNegotiation=!1,this.initiator||!this._firstNegotiation?(this._debug("starting batched negotiation"),this.negotiate()):this._debug("non-initiator initial negotiation request discarded"),this._firstNegotiation=!1}))}negotiate(){if(!this.destroying){if(this.destroyed)throw s(new Error("cannot negotiate after peer is destroyed"),"ERR_DESTROYED");this.initiator?this._isNegotiating?(this._queuedNegotiation=!0,this._debug("already negotiating, queueing")):(this._debug("start negotiation"),setTimeout(()=>{this._createOffer()},0)):this._isNegotiating?(this._queuedNegotiation=!0,this._debug("already negotiating, queueing")):(this._debug("requesting negotiation from initiator"),this.emit("signal",{type:"renegotiate",renegotiate:!0})),this._isNegotiating=!0}}destroy(e){this._destroy(e,()=>{})}_destroy(e,t){this.destroyed||this.destroying||(this.destroying=!0,this._debug("destroying (error: %s)",e&&(e.message||e)),d(()=>{if(this.destroyed=!0,this.destroying=!1,this._debug("destroy (error: %s)",e&&(e.message||e)),this.readable=this.writable=!1,this._readableState.ended||this.push(null),this._writableState.finished||this.end(),this._connected=!1,this._pcReady=!1,this._channelReady=!1,this._remoteTracks=null,this._remoteStreams=null,this._senderMap=null,clearInterval(this._closingInterval),this._closingInterval=null,clearInterval(this._interval),this._interval=null,this._chunk=null,this._cb=null,this._onFinishBound&&this.removeListener("finish",this._onFinishBound),this._onFinishBound=null,this._channel){try{this._channel.close()}catch(e){}this._channel.onmessage=null,this._channel.onopen=null,this._channel.onclose=null,this._channel.onerror=null}if(this._pc){try{this._pc.close()}catch(e){}this._pc.oniceconnectionstatechange=null,this._pc.onicegatheringstatechange=null,this._pc.onsignalingstatechange=null,this._pc.onicecandidate=null,this._pc.ontrack=null,this._pc.ondatachannel=null}this._pc=null,this._channel=null,e&&this.emit("error",e),this.emit("close"),t()}))}_setupData(e){if(!e.channel)return this.destroy(s(new Error("Data channel event is missing `channel` property"),"ERR_DATA_CHANNEL"));this._channel=e.channel,this._channel.binaryType="arraybuffer","number"==typeof this._channel.bufferedAmountLowThreshold&&(this._channel.bufferedAmountLowThreshold=c),this.channelName=this._channel.label,this._channel.onmessage=e=>{this._onChannelMessage(e)},this._channel.onbufferedamountlow=()=>{this._onChannelBufferedAmountLow()},this._channel.onopen=()=>{this._onChannelOpen()},this._channel.onclose=()=>{this._onChannelClose()},this._channel.onerror=e=>{const t=e.error instanceof Error?e.error:new Error(`Datachannel error: ${e.message} ${e.filename}:${e.lineno}:${e.colno}`);this.destroy(s(t,"ERR_DATA_CHANNEL"))};let t=!1;this._closingInterval=setInterval(()=>{this._channel&&"closing"===this._channel.readyState?(t&&this._onChannelClose(),t=!0):t=!1},5000)}_read(){}_write(e,t,n){if(this.destroyed)return n(s(new Error("cannot write after peer is destroyed"),"ERR_DATA_CHANNEL"));if(this._connected){try{this.send(e)}catch(e){return this.destroy(s(e,"ERR_DATA_CHANNEL"))}this._channel.bufferedAmount>c?(this._debug("start backpressure: bufferedAmount %d",this._channel.bufferedAmount),this._cb=n):n(null)}else this._debug("write before connect"),this._chunk=e,this._cb=n}_onFinish(){if(!this.destroyed){const e=()=>{setTimeout(()=>this.destroy(),1e3)};this._connected?e():this.once("connect",e)}}_startIceCompleteTimeout(){this.destroyed||this._iceCompleteTimer||(this._debug("started iceComplete timeout"),this._iceCompleteTimer=setTimeout(()=>{this._iceComplete||(this._iceComplete=!0,this._debug("iceComplete timeout completed"),this.emit("iceTimeout"),this.emit("_iceComplete"))},this.iceCompleteTimeout))}_createOffer(){this.destroyed||this._pc.createOffer(this.offerOptions).then(e=>{if(this.destroyed)return;this.trickle||this.allowHalfTrickle||(e.sdp=n(e.sdp)),e.sdp=this.sdpTransform(e.sdp);const t=()=>{if(!this.destroyed){const t=this._pc.localDescription||e;this._debug("signal"),this.emit("signal",{type:t.type,sdp:t.sdp})}};this._pc.setLocalDescription(e).then(()=>{this._debug("createOffer success"),this.destroyed||(this.trickle||this._iceComplete?t():this.once("_iceComplete",t))}).catch(e=>{this.destroy(s(e,"ERR_SET_LOCAL_DESCRIPTION"))})}).catch(e=>{this.destroy(s(e,"ERR_CREATE_OFFER"))})}_requestMissingTransceivers(){this._pc.getTransceivers&&this._pc.getTransceivers().forEach(e=>{e.mid||!e.sender.track||e.requested||(e.requested=!0,this.addTransceiver(e.sender.track.kind))})}_createAnswer(){this.destroyed||this._pc.createAnswer(this.answerOptions).then(e=>{if(this.destroyed)return;this.trickle||this.allowHalfTrickle||(e.sdp=n(e.sdp)),e.sdp=this.sdpTransform(e.sdp);const t=()=>{if(!this.destroyed){const t=this._pc.localDescription||e;this._debug("signal"),this.emit("signal",{type:t.type,sdp:t.sdp}),this.initiator||this._requestMissingTransceivers()}};this._pc.setLocalDescription(e).then(()=>{this.destroyed||(this.trickle||this._iceComplete?t():this.once("_iceComplete",t))}).catch(e=>{this.destroy(s(e,"ERR_SET_LOCAL_DESCRIPTION"))})}).catch(e=>{this.destroy(s(e,"ERR_CREATE_ANSWER"))})}_onConnectionStateChange(){this.destroyed||"failed"===this._pc.connectionState&&this.destroy(s(new Error("Connection failed."),"ERR_CONNECTION_FAILURE"))}_onIceStateChange(){if(this.destroyed)return;const e=this._pc.iceConnectionState,t=this._pc.iceGatheringState;this._debug("iceStateChange (connection: %s) (gathering: %s)",e,t),this.emit("iceStateChange",e,t),("connected"===e||"completed"===e)&&(this._pcReady=!0,this._maybeReady()),"failed"===e&&this.destroy(s(new Error("Ice connection failed."),"ERR_ICE_CONNECTION_FAILURE")),"closed"===e&&this.destroy(s(new Error("Ice connection closed."),"ERR_ICE_CONNECTION_CLOSED"))}getStats(e){const t=e=>("[object Array]"===Object.prototype.toString.call(e.values)&&e.values.forEach(t=>{Object.assign(e,t)}),e);0===this._pc.getStats.length||this._isReactNativeWebrtc?this._pc.getStats().then(n=>{const r=[];n.forEach(e=>{r.push(t(e))}),e(null,r)},t=>e(t)):0<this._pc.getStats.length?this._pc.getStats(n=>{if(this.destroyed)return;const r=[];n.result().forEach(e=>{const n={};e.names().forEach(t=>{n[t]=e.stat(t)}),n.id=e.id,n.type=e.type,n.timestamp=e.timestamp,r.push(t(n))}),e(null,r)},t=>e(t)):e(null,[])}_maybeReady(){if(this._debug("maybeReady pc %s channel %s",this._pcReady,this._channelReady),this._connected||this._connecting||!this._pcReady||!this._channelReady)return;this._connecting=!0;const e=()=>{this.destroyed||this.getStats((t,n)=>{if(this.destroyed)return;t&&(n=[]);const r={},a={},o={};let i=!1;n.forEach(e=>{("remotecandidate"===e.type||"remote-candidate"===e.type)&&(r[e.id]=e),("localcandidate"===e.type||"local-candidate"===e.type)&&(a[e.id]=e),("candidatepair"===e.type||"candidate-pair"===e.type)&&(o[e.id]=e)});const d=e=>{i=!0;let t=a[e.localCandidateId];t&&(t.ip||t.address)?(this.localAddress=t.ip||t.address,this.localPort=+t.port):t&&t.ipAddress?(this.localAddress=t.ipAddress,this.localPort=+t.portNumber):"string"==typeof e.googLocalAddress&&(t=e.googLocalAddress.split(":"),this.localAddress=t[0],this.localPort=+t[1]),this.localAddress&&(this.localFamily=this.localAddress.includes(":")?"IPv6":"IPv4");let n=r[e.remoteCandidateId];n&&(n.ip||n.address)?(this.remoteAddress=n.ip||n.address,this.remotePort=+n.port):n&&n.ipAddress?(this.remoteAddress=n.ipAddress,this.remotePort=+n.portNumber):"string"==typeof e.googRemoteAddress&&(n=e.googRemoteAddress.split(":"),this.remoteAddress=n[0],this.remotePort=+n[1]),this.remoteAddress&&(this.remoteFamily=this.remoteAddress.includes(":")?"IPv6":"IPv4"),this._debug("connect local: %s:%s remote: %s:%s",this.localAddress,this.localPort,this.remoteAddress,this.remotePort)};if(n.forEach(e=>{"transport"===e.type&&e.selectedCandidatePairId&&d(o[e.selectedCandidatePairId]),("googCandidatePair"===e.type&&"true"===e.googActiveConnection||("candidatepair"===e.type||"candidate-pair"===e.type)&&e.selected)&&d(e)}),!i&&(!Object.keys(o).length||Object.keys(a).length))return void setTimeout(e,100);if(this._connecting=!1,this._connected=!0,this._chunk){try{this.send(this._chunk)}catch(e){return this.destroy(s(e,"ERR_DATA_CHANNEL"))}this._chunk=null,this._debug("sent chunk from \"write before connect\"");const e=this._cb;this._cb=null,e(null)}"number"!=typeof this._channel.bufferedAmountLowThreshold&&(this._interval=setInterval(()=>this._onInterval(),150),this._interval.unref&&this._interval.unref()),this._debug("connect"),this.emit("connect")})};e()}_onInterval(){this._cb&&this._channel&&!(this._channel.bufferedAmount>c)&&this._onChannelBufferedAmountLow()}_onSignalingStateChange(){this.destroyed||("stable"===this._pc.signalingState&&(this._isNegotiating=!1,this._debug("flushing sender queue",this._sendersAwaitingStable),this._sendersAwaitingStable.forEach(e=>{this._pc.removeTrack(e),this._queuedNegotiation=!0}),this._sendersAwaitingStable=[],this._queuedNegotiation?(this._debug("flushing negotiation queue"),this._queuedNegotiation=!1,this._needsNegotiation()):(this._debug("negotiated"),this.emit("negotiated"))),this._debug("signalingStateChange %s",this._pc.signalingState),this.emit("signalingStateChange",this._pc.signalingState))}_onIceCandidate(e){this.destroyed||(e.candidate&&this.trickle?this.emit("signal",{type:"candidate",candidate:{candidate:e.candidate.candidate,sdpMLineIndex:e.candidate.sdpMLineIndex,sdpMid:e.candidate.sdpMid}}):!e.candidate&&!this._iceComplete&&(this._iceComplete=!0,this.emit("_iceComplete")),e.candidate&&this._startIceCompleteTimeout())}_onChannelMessage(e){if(this.destroyed)return;let t=e.data;t instanceof ArrayBuffer&&(t=l.from(t)),this.push(t)}_onChannelBufferedAmountLow(){if(!this.destroyed&&this._cb){this._debug("ending backpressure: bufferedAmount %d",this._channel.bufferedAmount);const e=this._cb;this._cb=null,e(null)}}_onChannelOpen(){this._connected||this.destroyed||(this._debug("on channel open"),this._channelReady=!0,this._maybeReady())}_onChannelClose(){this.destroyed||(this._debug("on channel close"),this.destroy())}_onTrack(e){this.destroyed||e.streams.forEach(t=>{this._debug("on track"),this.emit("track",e.track,t),this._remoteTracks.push({track:e.track,stream:t}),this._remoteStreams.some(e=>e.id===t.id)||(this._remoteStreams.push(t),d(()=>{this._debug("on stream"),this.emit("stream",t)}))})}_debug(){const e=[].slice.call(arguments);e[0]="[randombytes is stupid] "+e[0],a.apply(null,e)}}u.WEBRTC_SUPPORT=!!o(),u.config={iceServers:[{urls:["stun:stun.l.google.com:19302","stun:global.stun.twilio.com:3478"]}],sdpSemantics:"unified-plan"},u.channelConfig={},t.exports=u},{buffer:3,debug:7,"err-code":9,"get-browser-rtc":10,"queue-microtask":13,"readable-stream":28}]},{},[])("/")});

// Looks like initiator should go first! Then secondary user clicks afterward.

(function() {
const VIDEO_BORDER_SIZE_PX = 15
const CHAT_SIGNAL_PREFIX = 'SIGNALVIACHAT'
const $ = qry => document.querySelector(qry)
const $id = id => document.getElementById(id)
const $new = el => document.createElement(el)
HTMLCollection.prototype.last = function () { return this[this.length - 1] }

const style = `
/* Kill transitions b/c they mess up drag-to-resize */
#chat-wrapper, #chat-wrapper *, .tp-video {
  transition: none !important
}
#televid-video-container {
  position: relative;
  width: 100%;
}
#televid-zoom-container {
  position: absolute;
  top: 10px;
  left: 10px;
  display: flex;
  gap: 10px;
}
#televid-audio-container {
  position: absolute;
  bottom: 10px;
  display: flex;
  justify-content: space-between;
  padding-left: 10px;
  padding-right: 10px;
  width: calc(100% - 20px);
}
#televid-controls-container {
  opacity: 0;
  transition: opacity 0.1s ease-in-out;
}
#televid-video-container:hover #televid-controls-container {
  opacity: 1;
}
.televid-button {
  opacity: 0.5;
  background: lightgray;
  border-radius: 50%;
  border: none;
  width: 50px;
  height: 50px;
  padding: 10px;
}
.televid-button:active {
  background: gray;
  color: white;
}
#televid-mute {
  text-align: center;
}
#televid-mute img {
  max-width: 100%;
  max-height: 100%;
}
#televid-mute.muted {
  background: black;
}
#televid-mute.muted img {
  filter: invert(100%);
}
#televid-audio-slider {
 -webkit-appearance: none !important;
 height: 10px;
 width: 150px;
 margin-top: 25px;
 background: var(--base-red);
 border: none;
 outline: none;
 border-radius: 1em;
 vertical-align: bottom;
}
#televid-audio-slider::-webkit-slider-thumb {
 -webkit-appearance: none !important;
 width: 20px;
 height: 20px;
 background: #fcfcfc;
 border: 2px solid #fcfcfc;
 border-radius: 50%;
 cursor: pointer;
}
#televid-audio-slider::-webkit-slider-thumb:hover {
  background: var(--base-red);
}
`

// This is so hacky...
let globalStreamRef = null

// Sanitizes peer connection details in msgEl; returns the contents of the
// signal if it's valid, or else null
const sanitizeChat = (msgEl, isOwn) => {
  // deal with their stupid self-promo stuff
  if (!msgEl) return null

  const ownName = $id('nickname-edit').placeholder

  // check sender (if none specified, traverse previous messages until we find
  // the one containing the sender)
  // let sender = null
  // let curEl = msgEl
  // while (sender === null) {
  //   const h3s = curEl.getElementsByTagName('h3')
  //   if (h3s.length > 0) {
  //     sender = h3s[0].textContent
  //   } else {
  //     curEl = msgEl.parentElement.previousSibling.children[1]
  //   }
  // }
  let sender = ""
  const h3s = msgEl.getElementsByTagName('h3')
  if (h3s.length > 0) {
    sender = h3s[0].textContent
  }

  // get message text
  const msgTextEl = msgEl.getElementsByTagName('p')[0]
  const txt = msgTextEl.textContent
  // we want to make sure we're only sanitizing the requested ones -- if we were
  // to sanitize the other party's details when doing an own-sanitization, we
  // might not ever actually read those details!
  if ((sender === ownName) === isOwn) {
    if (txt.slice(0, CHAT_SIGNAL_PREFIX.length) === CHAT_SIGNAL_PREFIX) {
      msgEl.classList.remove('message-txt')
      msgEl.classList.add('message-system')
      msgTextEl.textContent = 'sent peer connection details'
      return txt
    }
  }
  return null
}

// Also so hacky... (basically, if we send a chat message, queue a request to
// crawl through all chats and get rid of all of our *own* offers)
let sanitizationQueued = false
const sanitizeOwnChats = () => {
  const ownName = $id('nickname-edit').placeholder

  const children = $id('chat-history').children
  for (const child of children) {
    const msgEl = child.children[1]
    sanitizeChat(msgEl, true)
  }
  sanitizationQueued = false
}

const sendChat = msg => {
  $id('chat-input').textContent = msg
  $id('chat-input').dispatchEvent(new KeyboardEvent('keypress', {
    key: "Enter"
  }))
  if (!sanitizationQueued) {
    setTimeout(sanitizeOwnChats, 100)
    sanitizationQueued = true
  }
}

const go = stream => {
  let connecting = true
  globalStreamRef = stream

  stream.getAudioTracks()

  const peer = new SimplePeer({
    initiator: localStorage.getItem('televid_is_initiator') === 'true',
    stream: stream
  })

  peer.on('signal', data => {
    sendChat(`${CHAT_SIGNAL_PREFIX}${JSON.stringify(data)}`)
  })

  // checks if a message is the other person sending cnxn data
  const checkMsg = msgEl => {
    const txt = sanitizeChat(msgEl, false)
    if (txt === null) return false
    if (connecting) {
      peer.signal(JSON.parse(txt.slice(CHAT_SIGNAL_PREFIX.length)))
    }
    return true
  }

  // When signal received in chat,
  // call peer.signal(data)
  const chatLog = $id('chat-history')
  let found = false
  for (const child of chatLog.children) {
    found = found || checkMsg(child.children[1])
  }
  // if we're first, wait for them to send
  let observer
  if (!found) {
    observer = new MutationObserver((mutationList, observer) => {
      const msgEl = chatLog.children.last().children[1]
      checkMsg(msgEl)
    })
    // TODO: this is horrible
    // wait a few seconds so that our messages finish sending first
    setTimeout(() => {
      observer.observe(chatLog, {
        attributes: false,
        childList: true,
        subtree: false
      })
    }, 3000)
  }

  peer.on('stream', stream => {
    connecting = false
    const videoEl = $id('televid-video')
    if ('srcObject' in videoEl) {
      videoEl.srcObject = stream
    } else {
      videoEl.src = window.URL.createObjectURL(stream) // for older browsers
    }
    // just in case a few more trickle through
    setTimeout(() => observer.disconnect(), 10000)
    // observer.disconnect()

    videoEl.play()
  })
}

const init = () => {
  const wrapper = $id('chat-wrapper')
  const videoContainer = $new('div')
  videoContainer.style.textAlign = 'center'
  videoContainer.style.overflow = 'hidden'
  videoContainer.setAttribute('id', 'televid-video-container')
  const videoEl = $new('video')
  videoEl.setAttribute('id', 'televid-video')
  // videoEl.style.objectFit = 'cover'
  videoEl.style.height = '100%'
  videoEl.style.width = '100%'
  videoContainer.appendChild(videoEl)
  wrapper.insertBefore(videoContainer, $id('chat-container'))
  // make it clearer where to click to resize
  $id('chat-container').style.borderTop = '1px solid #333'

  // Load controls
  const ctrlsTemplate = $new('template')
  ctrlsTemplate.innerHTML = `<div id="televid-controls-container"><div id="televid-zoom-container"><button class="televid-button" id="televid-zoom-in"><img src="data:image/svg+xml,%3Csvg xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:cc='http://creativecommons.org/ns%23' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns%23' xmlns:svg='http://www.w3.org/2000/svg' xmlns='http://www.w3.org/2000/svg' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' viewBox='0 -256 1792 1792' id='svg2' version='1.1' inkscape:version='0.48.3.1 r9886' width='100%25' height='100%25' sodipodi:docname='zoom_in_font_awesome.svg'%3E%3Cmetadata id='metadata12'%3E%3Crdf:RDF%3E%3Ccc:Work rdf:about=''%3E%3Cdc:format%3Eimage/svg+xml%3C/dc:format%3E%3Cdc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/%3E%3C/cc:Work%3E%3C/rdf:RDF%3E%3C/metadata%3E%3Cdefs id='defs10'/%3E%3Csodipodi:namedview pagecolor='%23ffffff' bordercolor='%23666666' borderopacity='1' objecttolerance='10' gridtolerance='10' guidetolerance='10' inkscape:pageopacity='0' inkscape:pageshadow='2' inkscape:window-width='1024' inkscape:window-height='719' id='namedview8' showgrid='false' inkscape:zoom='0.13169643' inkscape:cx='896' inkscape:cy='896' inkscape:window-x='0' inkscape:window-y='25' inkscape:window-maximized='1' inkscape:current-layer='svg2'/%3E%3Cg transform='matrix(1,0,0,-1,68.338983,1224.678)' id='g4'%3E%3Cpath d='m 1024,736 v -64 q 0,-13 -9.5,-22.5 Q 1005,640 992,640 H 768 V 416 q 0,-13 -9.5,-22.5 Q 749,384 736,384 h -64 q -13,0 -22.5,9.5 Q 640,403 640,416 V 640 H 416 q -13,0 -22.5,9.5 Q 384,659 384,672 v 64 q 0,13 9.5,22.5 9.5,9.5 22.5,9.5 h 224 v 224 q 0,13 9.5,22.5 9.5,9.5 22.5,9.5 h 64 q 13,0 22.5,-9.5 Q 768,1005 768,992 V 768 h 224 q 13,0 22.5,-9.5 9.5,-9.5 9.5,-22.5 z m 128,-32 q 0,185 -131.5,316.5 Q 889,1152 704,1152 519,1152 387.5,1020.5 256,889 256,704 256,519 387.5,387.5 519,256 704,256 889,256 1020.5,387.5 1152,519 1152,704 z m 512,-832 q 0,-53 -37.5,-90.5 -37.5,-37.5 -90.5,-37.5 -54,0 -90,38 L 1103,124 Q 924,0 704,0 561,0 430.5,55.5 300,111 205.5,205.5 111,300 55.5,430.5 0,561 0,704 q 0,143 55.5,273.5 55.5,130.5 150,225 94.5,94.5 225,150 130.5,55.5 273.5,55.5 143,0 273.5,-55.5 130.5,-55.5 225,-150 94.5,-94.5 150,-225 Q 1408,847 1408,704 1408,484 1284,305 l 343,-343 q 37,-37 37,-90 z' id='path6' inkscape:connector-curvature='0' style='fill:currentColor'/%3E%3C/g%3E%3C/svg%3E" /></button><button class="televid-button" id="televid-zoom-out"><img src="data:image/svg+xml,%3Csvg xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:cc='http://creativecommons.org/ns%23' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns%23' xmlns:svg='http://www.w3.org/2000/svg' xmlns='http://www.w3.org/2000/svg' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' viewBox='0 -256 1792 1792' id='svg2' version='1.1' inkscape:version='0.48.3.1 r9886' width='100%25' height='100%25' sodipodi:docname='zoom_out_font_awesome.svg'%3E%3Cmetadata id='metadata12'%3E%3Crdf:RDF%3E%3Ccc:Work rdf:about=''%3E%3Cdc:format%3Eimage/svg+xml%3C/dc:format%3E%3Cdc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/%3E%3C/cc:Work%3E%3C/rdf:RDF%3E%3C/metadata%3E%3Cdefs id='defs10'/%3E%3Csodipodi:namedview pagecolor='%23ffffff' bordercolor='%23666666' borderopacity='1' objecttolerance='10' gridtolerance='10' guidetolerance='10' inkscape:pageopacity='0' inkscape:pageshadow='2' inkscape:window-width='1024' inkscape:window-height='719' id='namedview8' showgrid='false' inkscape:zoom='0.13169643' inkscape:cx='896.00001' inkscape:cy='896.00001' inkscape:window-x='0' inkscape:window-y='25' inkscape:window-maximized='1' inkscape:current-layer='svg2'/%3E%3Cg transform='matrix(1,0,0,-1,53.152542,1217.0848)' id='g4'%3E%3Cpath d='m 1024,736 v -64 q 0,-13 -9.5,-22.5 Q 1005,640 992,640 H 416 q -13,0 -22.5,9.5 Q 384,659 384,672 v 64 q 0,13 9.5,22.5 9.5,9.5 22.5,9.5 h 576 q 13,0 22.5,-9.5 9.5,-9.5 9.5,-22.5 z m 128,-32 q 0,185 -131.5,316.5 Q 889,1152 704,1152 519,1152 387.5,1020.5 256,889 256,704 256,519 387.5,387.5 519,256 704,256 889,256 1020.5,387.5 1152,519 1152,704 z m 512,-832 q 0,-53 -37.5,-90.5 -37.5,-37.5 -90.5,-37.5 -54,0 -90,38 L 1103,124 Q 924,0 704,0 561,0 430.5,55.5 300,111 205.5,205.5 111,300 55.5,430.5 0,561 0,704 q 0,143 55.5,273.5 55.5,130.5 150,225 94.5,94.5 225,150 130.5,55.5 273.5,55.5 143,0 273.5,-55.5 130.5,-55.5 225,-150 94.5,-94.5 150,-225 Q 1408,847 1408,704 1408,484 1284,305 l 343,-343 q 37,-37 37,-90 z' id='path6' inkscape:connector-curvature='0' style='fill:currentColor'/%3E%3C/g%3E%3C/svg%3E" /></button><button class="televid-button" id="televid-zoom-reset"><img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' xmlns:serif='http://www.serif.com/' width='100%25' height='100%25' viewBox='0 0 592 542' version='1.1' 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inkscape:window-y='32' inkscape:window-maximized='1' inkscape:pagecheckerboard='0' width='70.70676mm'/%3E%3Cmetadata id='metadata7'%3E%3Crdf:RDF%3E%3Ccc:Work rdf:about=''%3E%3Cdc:format%3Eimage/svg+xml%3C/dc:format%3E%3Cdc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/%3E%3C/cc:Work%3E%3C/rdf:RDF%3E%3C/metadata%3E%3Cg inkscape:label='Layer 1' inkscape:groupmode='layer' id='layer1' transform='translate(-184.43967,-425.95843)'%3E%3Cellipse ry='25.662374' rx='61.917446' cy='702.49701' cx='362.85715' id='path4333' style='fill:%23000000;fill-opacity:1'/%3E%3Cg id='g4373' transform='translate(406.43276)' style='fill:%23000000;fill-opacity:1'%3E%3Cpath sodipodi:nodetypes='csccccsccsssccc' d='m -106.83561,488.63325 v 72.55857 c 0,31.77 23.34,57.99 53.83,62.53 v 89.38 h 18.85 v -89.38 c 30.49,-4.54 53.84,-30.76 53.84,-62.53 v -72.55857 l -9.43,-0.003 v 72.55857 c 0,29.91 -23.92,53.84 -53.83,53.84 -29.91,0 -53.84,-23.93 -53.84,-53.84 v -72.55857 l -9.42,-0.003 z' style='fill: %23000000;fill-opacity:1;' id='rect4367' inkscape:connector-curvature='0'/%3E%3Cpath inkscape:connector-curvature='0' id='path4329' d='m -43.746094,425.95843 c -24.96,0 -45,20.67927 -45,46.32227 v 13.67773 54.73828 13.67774 c 0,25.643 20.04,46.32226 45,46.32226 24.95,0 45.0703128,-20.67926 45.0703128,-46.32226 V 540.18109 486.47406 472.2807 c 0,-25.643 -20.1203128,-46.32227 -45.0703128,-46.32227 z' style='fill: %23000000;fill-opacity:1;'/%3E%3C/g%3E%3Crect style='fill:%2300000;fill-opacity:1;stroke:%23ffffff;stroke-width:2.34972;stroke-linecap:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1' id='rect4580' width='333.34576' height='21.864975' x='-300.38458' y='643.09357' transform='matrix(0.70960609,-0.70459861,0.69482546,0.71917841,0,0)'/%3E%3C/g%3E%3C/svg%3E"/></button><input type="range" min="1" max="100" value="100" id="televid-audio-slider"></div></div>`
  const ctrlsContainer = ctrlsTemplate.content.firstChild
  videoContainer.appendChild(ctrlsContainer)

  // Al setters take numbers in px
  const setVidHeight = height => {
    videoContainer.style.height = height + 'px'
    $id('chat-container').style.height = `calc(100% - ${videoContainer.style.height})`
  }
  const setChatPaneWidth = width => {
    wrapper.style.width = width + "px"
    $id('chat-container').style.width = (width - 24) + "px"
    $('.watch-video--player-view.tp-video').classList.remove('with-chat')
    $('.watch-video--player-view.tp-video').style.width = `calc(100% - ${width}px)`
    $('.watch-video--player-view.tp-video').style.left = `0px`
  }

  // Load prefs
  const defaultZoom = parseFloat(localStorage.getItem('televid-pref-zoom')) || 1
  const defaultVolume = parseFloat(localStorage.getItem('televid-pref-vol')) || 1
  const defaultHeight = parseFloat(localStorage.getItem('televid-pref-vid-height')) || 240
  const defaultWidth = parseFloat(localStorage.getItem('televid-pref-pane-width')) || 280
  const defaultX = parseFloat(localStorage.getItem('televid-pref-panX')) || 0
  const defaultY = parseFloat(localStorage.getItem('televid-pref-panY')) || 0

  videoEl.style.transform = 'scale(' + defaultZoom + ')'
  videoEl.volume = defaultVolume
  setVidHeight(defaultHeight)
  setChatPaneWidth(defaultWidth)
  videoEl.style.marginTop = defaultX + "px"
  videoEl.style.marginLeft = defaultY + "px"

  // Listeners for control changes
  $id('televid-zoom-in').addEventListener('click', (e) => {
    const newZoom = (parseFloat(localStorage.getItem('televid-pref-zoom')) || 1) + 0.1
    videoEl.style.transform = 'scale(' + newZoom + ')'
    localStorage.setItem('televid-pref-zoom', newZoom)
  }, false)
  $id('televid-zoom-out').addEventListener('click', (e) => {
    let newZoom = (parseFloat(localStorage.getItem('televid-pref-zoom')) || 1) - 0.1
    if (newZoom < 0.1) newZoom = 0.1
    videoEl.style.transform = 'scale(' + newZoom + ')'
    localStorage.setItem('televid-pref-zoom', newZoom)
  }, false)
  $id('televid-zoom-reset').addEventListener('click', (e) => {
    videoEl.style.transform = 'scale(' + 1 + ')'
    videoEl.style.marginLeft = '0px'
    videoEl.style.marginTop = '0px'
    localStorage.setItem('televid-pref-panX', 0)
    localStorage.setItem('televid-pref-panY', 0)
    localStorage.setItem('televid-pref-zoom', 1)
  }, false)
  $id('televid-audio-slider').addEventListener('change', (e) => {
    const newVol = parseInt(e.target.value) / 100
    videoEl.volume = newVol
    localStorage.setItem('televid-pref-vol', newVol)
  }, false)
  $id('televid-mute').addEventListener('click', (e) => {
    if (!globalStreamRef) return
    if (!($id('televid-mute').classList.contains('muted'))) {
      // mute
      globalStreamRef.getAudioTracks()[0].enabled = false
      $id('televid-mute').classList.add('muted')
    } else {
      // unmute (make this the 'else' so that if we're left in an undefined
      //         state, it's at least an unmuted one)
      globalStreamRef.getAudioTracks()[0].enabled = true
      $id('televid-mute').classList.remove('muted')
    }
  }, false)

  // Drag to resize
  // - Video (vertical)
  let clickee
  let clickPos
  // this is a terrible hacky workaround, but live-computing the widths seems
  // to be failing for some reason...
  let oldWidth = parseInt(getComputedStyle(videoEl, '').width)
  const resize = e => {
    if (clickee === 'video') {
      const dy = clickPos - e.y
      clickPos = e.y
      const newHeight = (parseInt(getComputedStyle(videoContainer, '').height) - dy)
      setVidHeight(newHeight)
      localStorage.setItem('televid-pref-vid-height', newHeight)
    } else if (clickee === 'chat') {
      const dx = clickPos - e.x
      clickPos = e.x
      // const newWrapperWidth = parseInt(getComputedStyle(videoEl, '').width) + dx
      const newWrapperWidth = oldWidth + dx
      oldWidth = newWrapperWidth
      setChatPaneWidth(newWrapperWidth)
      localStorage.setItem('televid-pref-pane-width', newWrapperWidth)
    } else if (clickee === 'video-pan') {
      const dx = clickPos[0] - e.x
      const dy = clickPos[1] - e.y
      clickPos = [e.x, e.y]
      const newY = parseInt(getComputedStyle(videoEl, '').marginTop) - dy
      const newX = parseInt(getComputedStyle(videoEl, '').marginLeft) - dx
      // TODO: figure out how to avoid getting "blank space" when panning...
      videoEl.style.marginTop = newY + "px"
      videoEl.style.marginLeft = newX + "px"
      localStorage.setItem('televid-pref-panX', newX)
      localStorage.setItem('televid-pref-panY', newY)
    }
  }
  videoContainer.addEventListener('mousedown', e => {
    // ignore clicks on controls
    if (e.target.classList.contains('televid-button')
        || e.target.tagName.toLowerCase() === 'input') return

    // if (e.offsetY > e.target.clientHeight - VIDEO_BORDER_SIZE_PX) {
    //   clickPos = e.y
    //   clickee = 'video'
    //   document.addEventListener('mousemove', resize, false)
    // } else {
      clickPos = [e.x, e.y]
      clickee = 'video-pan'
      document.addEventListener('mousemove', resize, false)
    // }
  }, false)
  $id('chat-container').addEventListener('mousedown', e => {
    e.preventDefault()
    if (e.offsetY < VIDEO_BORDER_SIZE_PX) {
      clickPos = e.y
      clickee = 'video'
      document.addEventListener('mousemove', resize, false)
    }
  })
  document.addEventListener('mouseup', () => {
    document.removeEventListener('mousemove', resize, false)
  }, false)
  // this is ludicrous. why can't we just do it on document? who knows...
  // can't even do this in a forEach loop because...reasons? I hate JS
  wrapper.addEventListener('mouseup', () => {
    document.removeEventListener('mousemove', resize, false)
  }, false)
  
  // - Chat (horizontal)
  wrapper.addEventListener('mousedown', e => {
    if (e.offsetX < VIDEO_BORDER_SIZE_PX) {
      clickPos = e.x
      clickee = 'chat'
      document.addEventListener('mousemove', resize, false)
    }
  }, false)

  // get video/voice stream
  navigator.mediaDevices.getUserMedia({
    video: true,
    audio: true
  }).then(go)
  /*.catch(e => {
    alert('Initialization failed with error:\n' + e)
  })*/
}

// Main script
const injectButton = () => {
  // Update the title as an indication we've run
  const titleText = document.getElementsByClassName('extension-title')[0]
  titleText.style.webkitTextFillColor = 'transparent'
  titleText.style.background = 'linear-gradient(45deg, maroon, var(--base-red), maroon)'
  titleText.style.webkitBackgroundClip = 'text'

  // Stick the styles in now -- no reason to wait
  const styleEl = $new('style')
  styleEl.innerHTML = style
  document.getElementsByTagName('head')[0].appendChild(styleEl)
  
  // Inject the button
  const template = $new('template')
  const buttonHtml = `<button style="
                        font-size: 15px;
                        background: var(--base-red);
                        padding: 0.5em;
                        float: right;
                        margin-left: 5px;">Start Video</button>`
  template.innerHTML = buttonHtml
  $id('title').children[0].style.float = 'left'
  const button = template.content.firstChild
  $id('title').appendChild(button)
  button.addEventListener('click', () => {
    button.remove()
    init()
  }, false)
}

const attemptAddInjectionObserver = () => {
  const playerEl = document.getElementsByClassName('watch-video--player-view')[0]
  if (!playerEl) {
    setTimeout(attemptAddInjectionObserver, 1000)
    return
  }

  const injectionObserver = new MutationObserver((mutationList, observer) => {
    // TODO: this doesn't seem totally consistent
    if (playerEl.classList.contains('tp-video')) injectButton()
    injectionObserver.disconnect()
  })
  injectionObserver.observe(playerEl, {
    attributes: true,
    childList: false,
    subtree: false
  })

}

attemptAddInjectionObserver()

})()