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node-datachannel

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WebRTC For Node.js and Electron. libdatachannel node bindings.

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{"version":3,"file":"RTCPeerConnection.cjs","sources":["../../../src/polyfill/RTCPeerConnection.ts"],"sourcesContent":["/* eslint-disable @typescript-eslint/no-explicit-any */\nimport { DataChannelInitConfig, SelectedCandidateInfo } from '../lib/types';\nimport { PeerConnection } from '../lib/index';\nimport RTCSessionDescription from './RTCSessionDescription';\nimport RTCDataChannel from './RTCDataChannel';\nimport RTCIceCandidate from './RTCIceCandidate';\nimport { RTCDataChannelEvent, RTCPeerConnectionIceEvent } from './Events';\nimport RTCSctpTransport from './RTCSctpTransport';\nimport * as exceptions from './Exception';\nimport RTCCertificate from './RTCCertificate';\n\n// extend RTCConfiguration with peerIdentity\ninterface RTCConfiguration extends globalThis.RTCConfiguration {\n peerIdentity?: string;\n peerConnection?: PeerConnection;\n}\n\nexport default class RTCPeerConnection extends EventTarget implements globalThis.RTCPeerConnection {\n static async generateCertificate(): Promise<RTCCertificate> {\n throw new DOMException('Not implemented');\n }\n\n #peerConnection: PeerConnection;\n #localOffer: ReturnType<typeof createDeferredPromise>;\n #localAnswer: ReturnType<typeof createDeferredPromise>;\n #dataChannels: Set<globalThis.RTCDataChannel>;\n #dataChannelsClosed = 0;\n #config: globalThis.RTCConfiguration;\n #canTrickleIceCandidates: boolean | null = null;\n #sctp: globalThis.RTCSctpTransport;\n #announceNegotiation = false;\n\n #localCandidates: globalThis.RTCIceCandidate[] = [];\n #remoteCandidates: globalThis.RTCIceCandidate[] = [];\n\n // events\n onconnectionstatechange: globalThis.RTCPeerConnection['onconnectionstatechange'] = null;\n // For ondatachannel we need to define type manually\n ondatachannel: ((this: globalThis.RTCPeerConnection, ev: globalThis.RTCDataChannelEvent) => any) | null;\n onicecandidate: globalThis.RTCPeerConnection['onicecandidate'] = null;\n onicecandidateerror: globalThis.RTCPeerConnection['onicecandidateerror'] = null;\n oniceconnectionstatechange: globalThis.RTCPeerConnection['oniceconnectionstatechange'] = null;\n onicegatheringstatechange: globalThis.RTCPeerConnection['onicegatheringstatechange'] = null;\n onnegotiationneeded: globalThis.RTCPeerConnection['onnegotiationneeded'] = null;\n onsignalingstatechange: globalThis.RTCPeerConnection['onsignalingstatechange'] = null;\n ontrack: globalThis.RTCPeerConnection['ontrack'] = null;\n\n private _checkConfiguration(config: globalThis.RTCConfiguration): void {\n if (config && config.iceServers === undefined) config.iceServers = [];\n if (config && config.iceTransportPolicy === undefined) config.iceTransportPolicy = 'all';\n\n if (config?.iceServers === null) throw new TypeError('IceServers cannot be null');\n\n // Check for all the properties of iceServers\n if (Array.isArray(config?.iceServers)) {\n for (let i = 0; i < config.iceServers.length; i++) {\n if (config.iceServers[i] === null) throw new TypeError('IceServers cannot be null');\n if (config.iceServers[i] === undefined)\n throw new TypeError('IceServers cannot be undefined');\n if (Object.keys(config.iceServers[i]).length === 0)\n throw new TypeError('IceServers cannot be empty');\n\n // If iceServers is string convert to array\n if (typeof config.iceServers[i].urls === 'string')\n config.iceServers[i].urls = [config.iceServers[i].urls as string];\n\n // urls can not be empty\n if ((config.iceServers[i].urls as string[])?.some((url) => url == ''))\n throw new exceptions.SyntaxError('IceServers urls cannot be empty');\n\n // urls should be valid URLs and match the protocols \"stun:|turn:|turns:\"\n if (\n (config.iceServers[i].urls as string[])?.some((url) => {\n try {\n const parsedURL = new URL(url);\n\n return !/^(stun:|turn:|turns:)$/.test(parsedURL.protocol);\n } catch (error) {\n return true;\n }\n })\n )\n throw new exceptions.SyntaxError('IceServers urls wrong format');\n\n // If this is a turn server check for username and credential\n if ((config.iceServers[i].urls as string[])?.some((url) => url.startsWith('turn'))) {\n if (!config.iceServers[i].username)\n throw new exceptions.InvalidAccessError('IceServers username cannot be null');\n if (!config.iceServers[i].credential)\n throw new exceptions.InvalidAccessError('IceServers username cannot be undefined');\n }\n\n // length of urls can not be 0\n if (config.iceServers[i].urls?.length === 0)\n throw new exceptions.SyntaxError('IceServers urls cannot be empty');\n }\n }\n\n if (\n config &&\n config.iceTransportPolicy &&\n config.iceTransportPolicy !== 'all' &&\n config.iceTransportPolicy !== 'relay'\n )\n throw new TypeError('IceTransportPolicy must be either \"all\" or \"relay\"');\n }\n\n setConfiguration(config: globalThis.RTCConfiguration): void {\n this._checkConfiguration(config);\n this.#config = config;\n }\n\n constructor(config: RTCConfiguration = { iceServers: [], iceTransportPolicy: 'all' }) {\n super();\n\n this._checkConfiguration(config);\n this.#config = config;\n this.#localOffer = createDeferredPromise();\n this.#localAnswer = createDeferredPromise();\n this.#dataChannels = new Set();\n this.#canTrickleIceCandidates = null;\n\n try {\n const peerIdentity = (config as any)?.peerIdentity ?? `peer-${getRandomString(7)}`;\n this.#peerConnection =\n config?.peerConnection ??\n new PeerConnection(peerIdentity, {\n ...config,\n iceServers:\n config?.iceServers\n ?.map((server) => {\n const urls = Array.isArray(server.urls) ? server.urls : [server.urls];\n\n return urls.map((url) => {\n if (server.username && server.credential) {\n const [protocol, rest] = url.split(/:(.*)/);\n return `${protocol}:${server.username}:${server.credential}@${rest}`;\n }\n return url;\n });\n })\n .flat() ?? [],\n });\n } catch (error) {\n if (!error || !error.message) throw new exceptions.NotFoundError('Unknown error');\n throw new exceptions.SyntaxError(error.message);\n }\n\n // forward peerConnection events\n this.#peerConnection.onStateChange(() => {\n this.dispatchEvent(new Event('connectionstatechange'));\n });\n\n this.#peerConnection.onIceStateChange(() => {\n this.dispatchEvent(new Event('iceconnectionstatechange'));\n });\n\n this.#peerConnection.onSignalingStateChange(() => {\n this.dispatchEvent(new Event('signalingstatechange'));\n });\n\n this.#peerConnection.onGatheringStateChange(() => {\n this.dispatchEvent(new Event('icegatheringstatechange'));\n });\n\n this.#peerConnection.onDataChannel((channel) => {\n const dc = new RTCDataChannel(channel);\n this.#dataChannels.add(dc);\n this.dispatchEvent(new RTCDataChannelEvent('datachannel', { channel: dc }));\n });\n\n this.#peerConnection.onLocalDescription((sdp, type) => {\n if (type === 'offer') {\n this.#localOffer.resolve(new RTCSessionDescription({ sdp, type }));\n }\n\n if (type === 'answer') {\n this.#localAnswer.resolve(new RTCSessionDescription({ sdp, type }));\n }\n });\n\n this.#peerConnection.onLocalCandidate((candidate, sdpMid) => {\n if (sdpMid === 'unspec') {\n this.#localAnswer.reject(new Error(`Invalid description type ${sdpMid}`));\n return;\n }\n\n this.#localCandidates.push(new RTCIceCandidate({ candidate, sdpMid }));\n this.dispatchEvent(new RTCPeerConnectionIceEvent(new RTCIceCandidate({ candidate, sdpMid })));\n });\n\n // forward events to properties\n this.addEventListener('connectionstatechange', (e) => {\n this.onconnectionstatechange?.(e);\n });\n this.addEventListener('signalingstatechange', (e) => {\n this.onsignalingstatechange?.(e);\n });\n this.addEventListener('iceconnectionstatechange', (e) => {\n this.oniceconnectionstatechange?.(e);\n });\n this.addEventListener('icegatheringstatechange', (e) => {\n this.onicegatheringstatechange?.(e);\n });\n this.addEventListener('datachannel', (e) => {\n this.ondatachannel?.(e as RTCDataChannelEvent);\n });\n this.addEventListener('icecandidate', (e) => {\n this.onicecandidate?.(e as globalThis.RTCPeerConnectionIceEvent);\n });\n this.addEventListener('track', (e) => {\n this.ontrack?.(e as RTCTrackEvent);\n });\n this.addEventListener('negotiationneeded', (e) => {\n this.#announceNegotiation = true;\n this.onnegotiationneeded?.(e);\n });\n\n this.#sctp = new RTCSctpTransport({\n pc: this,\n });\n }\n\n // Extra FUnctions\n get ext_maxDataChannelId(): number {\n return this.#peerConnection.maxDataChannelId();\n }\n\n get ext_maxMessageSize(): number {\n return this.#peerConnection.maxMessageSize();\n }\n\n get ext_localCandidates(): globalThis.RTCIceCandidate[] {\n return this.#localCandidates;\n }\n\n get ext_remoteCandidates(): globalThis.RTCIceCandidate[] {\n return this.#remoteCandidates;\n }\n\n selectedCandidatePair(): {\n local: SelectedCandidateInfo;\n remote: SelectedCandidateInfo;\n } | null {\n return this.#peerConnection.getSelectedCandidatePair();\n }\n\n get canTrickleIceCandidates(): boolean | null {\n return this.#canTrickleIceCandidates;\n }\n\n get connectionState(): globalThis.RTCPeerConnectionState {\n return this.#peerConnection.state();\n }\n\n get iceConnectionState(): globalThis.RTCIceConnectionState {\n let state = this.#peerConnection.iceState();\n // libdatachannel uses 'completed' instead of 'connected'\n // see /webrtc/getstats.html\n if (state == 'completed') state = 'connected';\n return state;\n }\n\n get iceGatheringState(): globalThis.RTCIceGatheringState {\n return this.#peerConnection.gatheringState();\n }\n\n get currentLocalDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.localDescription() as any);\n }\n\n get currentRemoteDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.remoteDescription() as any);\n }\n\n get localDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.localDescription() as any);\n }\n\n get pendingLocalDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.localDescription() as any);\n }\n\n get pendingRemoteDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.remoteDescription() as any);\n }\n\n get remoteDescription(): globalThis.RTCSessionDescription {\n return new RTCSessionDescription(this.#peerConnection.remoteDescription() as any);\n }\n\n get sctp(): globalThis.RTCSctpTransport {\n return this.#sctp;\n }\n\n get signalingState(): globalThis.RTCSignalingState {\n return this.#peerConnection.signalingState();\n }\n\n async addIceCandidate(candidate?: globalThis.RTCIceCandidateInit | null): Promise<void> {\n if (!candidate || !candidate.candidate) {\n return;\n }\n\n if (candidate.sdpMid === null && candidate.sdpMLineIndex === null) {\n throw new TypeError('sdpMid must be set');\n }\n\n if (candidate.sdpMid === undefined && candidate.sdpMLineIndex == undefined) {\n throw new TypeError('sdpMid must be set');\n }\n\n // Reject if sdpMid format is not valid\n // ??\n if (candidate.sdpMid && candidate.sdpMid.length > 3) {\n // console.log(candidate.sdpMid);\n throw new exceptions.OperationError('Invalid sdpMid format');\n }\n\n // We don't care about sdpMLineIndex, just for test\n if (!candidate.sdpMid && candidate.sdpMLineIndex > 1) {\n throw new exceptions.OperationError('This is only for test case.');\n }\n\n try {\n this.#peerConnection.addRemoteCandidate(candidate.candidate, candidate.sdpMid ?? '0');\n this.#remoteCandidates.push(\n new RTCIceCandidate({\n candidate: candidate.candidate,\n sdpMid: candidate.sdpMid ?? '0',\n }),\n );\n } catch (error) {\n if (!error || !error.message) throw new exceptions.NotFoundError('Unknown error');\n\n // Check error Message if contains specific message\n if (error.message.includes('remote candidate without remote description'))\n throw new exceptions.InvalidStateError(error.message);\n if (error.message.includes('Invalid candidate format'))\n throw new exceptions.OperationError(error.message);\n\n throw new exceptions.NotFoundError(error.message);\n }\n }\n\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n addTrack(_track, ..._streams): globalThis.RTCRtpSender {\n throw new DOMException('Not implemented');\n }\n\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n addTransceiver(_trackOrKind, _init): globalThis.RTCRtpTransceiver {\n throw new DOMException('Not implemented');\n }\n\n close(): void {\n this.#peerConnection.close();\n }\n\n createAnswer(): Promise<globalThis.RTCSessionDescriptionInit | any> {\n return this.#localAnswer;\n }\n\n createDataChannel(label: string, opts: globalThis.RTCDataChannelInit = {}): RTCDataChannel {\n const nativeOpts: DataChannelInitConfig = {\n ...opts,\n // libdatachannel uses \"unordered\", opposite of RTCDataChannelInit.ordered\n unordered: opts.ordered === false ? true : false,\n };\n\n const channel = this.#peerConnection.createDataChannel(label, nativeOpts);\n const dataChannel = new RTCDataChannel(channel, opts);\n\n // ensure we can close all channels when shutting down\n this.#dataChannels.add(dataChannel);\n dataChannel.addEventListener('close', () => {\n this.#dataChannels.delete(dataChannel);\n this.#dataChannelsClosed++;\n });\n\n if (this.#announceNegotiation == null) {\n this.#announceNegotiation = false;\n this.dispatchEvent(new Event('negotiationneeded'));\n }\n\n return dataChannel;\n }\n\n createOffer(): Promise<globalThis.RTCSessionDescriptionInit | any> {\n return this.#localOffer;\n }\n\n getConfiguration(): globalThis.RTCConfiguration {\n return this.#config;\n }\n\n getReceivers(): globalThis.RTCRtpReceiver[] {\n throw new DOMException('Not implemented');\n }\n\n getSenders(): globalThis.RTCRtpSender[] {\n throw new DOMException('Not implemented');\n }\n\n getStats(): Promise<globalThis.RTCStatsReport> | any {\n return new Promise((resolve) => {\n const report = new Map();\n const cp = this.#peerConnection?.getSelectedCandidatePair();\n const bytesSent = this.#peerConnection?.bytesSent();\n const bytesReceived = this.#peerConnection?.bytesReceived();\n const rtt = this.#peerConnection?.rtt();\n\n if (!cp) {\n return resolve(report);\n }\n\n const localIdRs = getRandomString(8);\n const localId = 'RTCIceCandidate_' + localIdRs;\n report.set(localId, {\n id: localId,\n type: 'local-candidate',\n timestamp: Date.now(),\n candidateType: cp.local.type,\n ip: cp.local.address,\n port: cp.local.port,\n });\n\n const remoteIdRs = getRandomString(8);\n const remoteId = 'RTCIceCandidate_' + remoteIdRs;\n report.set(remoteId, {\n id: remoteId,\n type: 'remote-candidate',\n timestamp: Date.now(),\n candidateType: cp.remote.type,\n ip: cp.remote.address,\n port: cp.remote.port,\n });\n\n const candidateId = 'RTCIceCandidatePair_' + localIdRs + '_' + remoteIdRs;\n report.set(candidateId, {\n id: candidateId,\n type: 'candidate-pair',\n timestamp: Date.now(),\n localCandidateId: localId,\n remoteCandidateId: remoteId,\n state: 'succeeded',\n nominated: true,\n writable: true,\n bytesSent: bytesSent,\n bytesReceived: bytesReceived,\n totalRoundTripTime: rtt,\n currentRoundTripTime: rtt,\n });\n\n const transportId = 'RTCTransport_0_1';\n report.set(transportId, {\n id: transportId,\n timestamp: Date.now(),\n type: 'transport',\n bytesSent: bytesSent,\n bytesReceived: bytesReceived,\n dtlsState: 'connected',\n selectedCandidatePairId: candidateId,\n selectedCandidatePairChanges: 1,\n });\n\n // peer-connection'\n report.set('P', {\n id: 'P',\n type: 'peer-connection',\n timestamp: Date.now(),\n dataChannelsOpened: this.#dataChannels.size,\n dataChannelsClosed: this.#dataChannelsClosed,\n });\n\n return resolve(report);\n });\n }\n\n getTransceivers(): globalThis.RTCRtpTransceiver[] {\n return []; // throw new DOMException('Not implemented');\n }\n\n removeTrack(): void {\n throw new DOMException('Not implemented');\n }\n\n restartIce(): Promise<void> {\n throw new DOMException('Not implemented');\n }\n\n async setLocalDescription(description: globalThis.RTCSessionDescriptionInit): Promise<void> {\n if (description?.type !== 'offer') {\n // any other type causes libdatachannel to throw\n return;\n }\n\n this.#peerConnection.setLocalDescription(description?.type as any);\n }\n\n async setRemoteDescription(description: globalThis.RTCSessionDescriptionInit): Promise<void> {\n if (description.sdp == null) {\n throw new DOMException('Remote SDP must be set');\n }\n\n this.#peerConnection.setRemoteDescription(description.sdp, description.type as any);\n }\n}\n\nfunction createDeferredPromise(): any {\n let resolve: any, reject: any;\n\n const promise = new Promise(function (_resolve, _reject) {\n resolve = _resolve;\n reject = _reject;\n });\n\n (promise as any).resolve = resolve;\n (promise as any).reject = reject;\n return promise;\n}\n\nfunction getRandomString(length: number): string {\n return Math.random()\n .toString(36)\n .substring(2, 2 + 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