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import { Base64 } from '../../utils/base64';
import { Cryptography, CryptoKeyPair } from '../../utils/cryptography';
import { Logger } from '../../utils/logger';
import { newError } from '../../utils/new-error';
import { Utf8 } from '../../utils/utf8';
import { CallService } from '../call-service';
import { SessionService } from '../session-service';
import { TimeService } from '../time-service';
import { IceServer } from './ice-server';
import { WebRTC } from './web-rtc';
import { gzip, ungzip } from 'pako';
/**
* Enumeration of all possible states in a WebRTC connection establishment saga.
* These states represent the sequential steps in the WebRTC connection handshake process,
* from initialization through negotiation to connection establishment.
*/
export enum ConnectionSagaState {
New = 0,
AwaitDial,
AwaitingDial,
DialAccepted,
SendDial,
SendingDial,
DialSent,
AwaitOffer,
AwaitingOffer,
OfferReceived,
SendOffer,
SendingOffer,
OfferSent,
AwaitAnswer,
AwaitingAnswer,
AnswerReceived,
SendAnswer,
SendingAnswer,
AnswerSent,
AwaitConnection,
AwaitingConnection,
Connected,
Closed,
}
/**
* Defines the connection direction type.
* 'incoming' represents connections initiated by remote peers.
* 'outgoing' represents connections initiated by the local peer.
*/
export type ConnectionSagaType = 'incoming' | 'outgoing';
/**
* Interface for managing a WebRTC connection establishment saga.
* Handles the state machine and cryptographic operations required for secure
* peer-to-peer connection establishment via a signaling server.
*/
export interface ConnectionSaga {
/**
* Optional callback triggered when the saga state changes.
*
* @param from - Previous state
* @param to - New state
*/
onStateChanged?: (from: ConnectionSagaState, to: ConnectionSagaState) => void;
/**
* Optional callback triggered when a message is received from the peer.
*
* @param message - The received message
*/
onMessage?: (message: string) => void;
/**
* The public key of the remote peer in this connection.
*/
get publicKey(): string;
/**
* The current state of the connection saga.
*/
get state(): ConnectionSagaState;
/**
* The direction of this connection (incoming or outgoing).
*/
get type(): ConnectionSagaType;
/**
* Function to continue the saga when awaiting external input.
*/
get continue(): () => void;
/**
* Function to abort the saga and terminate the connection attempt.
*/
get abort(): () => void;
/**
* Initializes and starts the connection saga with the specified initial state.
*
* @param initialState - Starting state for the saga
* @returns Promise resolving to this saga instance when initialized
*/
open(initialState: ConnectionSagaState): Promise<ConnectionSaga>;
/**
* Sets the encryption key for secure communication with the peer.
*
* @param encryptionPublicKeyBase64 - Base64-encoded public key from the remote peer
*/
setEncryption(encryptionPublicKeyBase64: string): void;
/**
* Sets the SDP session description received from the peer.
* This contains the offer or answer needed for WebRTC connection.
*
* @param encryptedDataBase64 - Base64-encoded encrypted SDP data
* @returns Promise that resolves when description is processed
*/
setDescription(encryptedDataBase64: string): Promise<void>;
/**
* Adds an ICE candidate received from the peer.
* These are network connection options for establishing the WebRTC link.
*
* @param encryptedDataBase64 - Base64-encoded encrypted ICE candidate
* @returns Promise that resolves when the candidate is added
*/
addIceCandidate(encryptedDataBase64: string): Promise<void>;
/**
* Sends a message to the peer once the connection is established.
*
* @param message - Message to send to the peer
*/
send(message: string): void;
}
/**
* Internal interface representing a WebRTC SDP description.
* Contains session description data used during connection negotiation.
*/
interface WebRtcDescription {
/**
* Session Description Protocol (SDP) data containing connection parameters.
*/
sdp?: string;
// noinspection SpellCheckingInspection
/**
* Type of SDP message in the WebRTC handshake process.
*/
type: 'answer' | 'offer' | 'pranswer' | 'rollback';
}
/**
* Internal interface representing a WebRTC ICE candidate.
* Contains network connectivity information for peer connection.
*/
interface WebRtcIceCandidate {
/**
* The candidate's connectivity information string.
*/
candidate?: string;
/**
* The index of the media description this candidate is associated with.
*/
sdpMLineIndex?: number | null;
/**
* The identification tag of the media description this candidate is associated with.
*/
sdpMid?: string | null;
/**
* The fragment identifier for this candidate, matching the username fragment in the SDP.
*/
usernameFragment?: string | null;
}
/**
* Factory function that creates and returns a ConnectionSaga implementation.
* Manages the WebRTC connection establishment process between peers including
* secure key exchange, signaling, and data channel creation.
*
* @param publicKey - Public key of the remote peer
* @param type - Direction of the connection (incoming or outgoing)
* @param logger - Logger for recording connection events
* @param timeService - Service for retrieving server time
* @param callService - Service for signaling with the remote peer
* @param sessionService - Service for session management
* @param base64 - Utility for Base64 encoding/decoding
* @param utf8 - Utility for UTF-8 encoding/decoding
* @param cryptography - Utility for cryptographic operations
* @param webRTC - WebRTC interface implementation
* @param iceServers - Optional list of ICE servers for NAT traversal
* @param maxStepWaitMilliseconds - Maximum wait time for each step in milliseconds
* @returns An implementation of the ConnectionSaga interface
*/
export function getConnectionSaga(
publicKey: string,
type: ConnectionSagaType,
logger: Logger,
timeService: TimeService,
callService: CallService,
sessionService: SessionService,
base64: Base64,
utf8: Utf8,
cryptography: Cryptography,
webRTC: WebRTC,
iceServers?: IceServer[],
maxStepWaitMilliseconds: number = 60 * 1000,
): ConnectionSaga {
let createdAt = timeService.serverTime;
let encryptionKeyPair: CryptoKeyPair = cryptography.generateEncryptionKeyPair();
let state: ConnectionSagaState = ConnectionSagaState.New;
const stateAwaiterGteMap: {
[state: number]: (() => void)[];
} = {};
function setState(value: ConnectionSagaState) {
const current = state;
state = value;
new Promise<void>((resolve) => {
if (saga.onStateChanged) {
saga.onStateChanged(current, state);
}
resolve();
}).catch((err) => {
logger.error(`[connection-saga] State change callback error in ${type} connection with ${publicKey}.`, err);
});
for (let i = value; i >= 0; --i) {
if (stateAwaiterGteMap[i]) {
for (const callback of stateAwaiterGteMap[i]) {
callback();
}
stateAwaiterGteMap[i] = [];
}
}
}
let _continueCallback: (() => void) | undefined;
let iceCandidates: WebRtcIceCandidate[] = [];
let _rtcPeerConnection: RTCPeerConnection | undefined;
function getRtcPeerConnection(): RTCPeerConnection {
if (!_rtcPeerConnection) {
throw newError(
logger,
`[connection-saga] WebRTC peer connection is not initialized in ${type} connection with ${publicKey}.`,
);
}
return _rtcPeerConnection;
}
let _rtcSendDataChannel: RTCDataChannel | undefined;
let rtcReceiveDataChannel: RTCDataChannel | undefined;
function getRtcSendDataChannel(): RTCDataChannel {
if (!_rtcSendDataChannel) {
throw newError(
logger,
`[connection-saga] WebRTC data send channel is not initialized in ${type} connection with ${publicKey}.`,
);
}
return _rtcSendDataChannel;
}
let _sharedSymmetricKey: Uint8Array | undefined;
function getSharedSymmetricKey(): Uint8Array {
if (!_sharedSymmetricKey) {
throw newError(
logger,
`[connection-saga] Shared symmetric key is not initialized in ${type} connection with ${publicKey}.`,
);
}
return _sharedSymmetricKey;
}
function setSharedSymmetricKey(value: Uint8Array) {
_sharedSymmetricKey = value;
}
async function awaitStateGte(value: ConnectionSagaState): Promise<void> {
if (state >= value) {
return;
}
await new Promise<void>((resolve) => {
logger.debug(
`[connection-saga] Awaiting for saga state = ${ConnectionSagaState[value]} in ${type} connection with ${publicKey}. Current state = ${ConnectionSagaState[state]}`,
);
stateAwaiterGteMap[value] = stateAwaiterGteMap[value] || [];
stateAwaiterGteMap[value].push(resolve);
});
logger.debug(
`[connection-saga] Got saga state = ${ConnectionSagaState[state]} in ${type} connection with ${publicKey}.`,
);
}
function setContinueCallback(value: () => void, reason?: string): void {
_continueCallback = value;
logger.debug(`[connection-saga] Continue callback set.`, reason);
}
function removeContinueCallback(reason?: string): void {
_continueCallback = undefined;
logger.debug(`[connection-saga] Continue callback removed.`, reason);
}
let rtcSendDataChannelSafeKiller: (() => void) | undefined;
let rtcReceiveDataChannelSafeKiller: (() => void) | undefined;
let stepTimeout: NodeJS.Timeout | undefined;
async function awaitDial(): Promise<boolean> {
logger.debug(`[connection-saga] Awaiting for Dial in ${type} connection with ${publicKey}`);
return await new Promise<void>(async (resolve, reject) => {
stepTimeout = setTimeout(reject, maxStepWaitMilliseconds);
setContinueCallback(resolve, 'Awaiting for Dial.');
setState(ConnectionSagaState.AwaitingDial);
}).then(
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Dial Accepted.');
logger.debug(`[connection-saga] Dial received in ${type} connection with ${publicKey}.`);
setState(ConnectionSagaState.DialAccepted);
return true;
},
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Timeout awaiting for Dial.');
setState(ConnectionSagaState.New);
return false;
},
);
}
async function sendDial(): Promise<void> {
logger.debug(`[connection-saga] Sending Dial in ${type} connection with ${publicKey}`);
setState(ConnectionSagaState.SendingDial);
await callService.dial(
sessionService.signingPublicKeyBase64,
publicKey,
base64.encode(encryptionKeyPair.publicKey),
);
setState(ConnectionSagaState.DialSent);
logger.debug(`[connection-saga] Dial sent in ${type} connection with ${publicKey}`);
}
async function awaitOffer(): Promise<boolean> {
logger.debug(`[connection-saga] Awaiting for Offer in ${type} connection with ${publicKey}`);
return await new Promise<void>(async (resolve, reject) => {
stepTimeout = setTimeout(reject, maxStepWaitMilliseconds);
setContinueCallback(resolve, 'Awaiting for Offer');
setState(ConnectionSagaState.AwaitingOffer);
}).then(
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Offer Received');
logger.debug(`[connection-saga] Offer received in ${type} connection with ${publicKey}`);
setState(ConnectionSagaState.OfferReceived);
return true;
},
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Timeout awaiting for Offer.');
setState(ConnectionSagaState.New);
return false;
},
);
}
async function gatherWebRtcOffer(): Promise<WebRtcDescription> {
logger.debug(`[connection-saga] Gathering WebRTC offer data in ${type} connection with ${publicKey}`);
const offer = await getRtcPeerConnection().createOffer();
await getRtcPeerConnection().setLocalDescription(offer);
return offer;
}
async function sendOffer(): Promise<void> {
logger.debug(`[connection-saga] Sending Offer in ${type} connection with ${publicKey}`);
setState(ConnectionSagaState.SendingOffer);
const offerData = await gatherWebRtcOffer();
const offerDataString = JSON.stringify(offerData);
const offerDataBytes = utf8.decode(offerDataString);
const offerDataEncrypted = cryptography.encrypt(offerDataBytes, getSharedSymmetricKey());
await callService.offer(
sessionService.signingPublicKeyBase64,
publicKey,
base64.encode(encryptionKeyPair.publicKey),
offerDataEncrypted,
);
setState(ConnectionSagaState.OfferSent);
logger.debug(`[connection-saga] Offer sent in ${type} connection with ${publicKey}`);
}
async function awaitAnswer(): Promise<boolean> {
logger.debug(`[connection-saga] Awaiting for Answer in ${type} connection with ${publicKey}`);
return await new Promise<void>(async (resolve, reject) => {
stepTimeout = setTimeout(reject, maxStepWaitMilliseconds);
setContinueCallback(resolve, 'Awaiting for Answer');
setState(ConnectionSagaState.AwaitingAnswer);
}).then(
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Answer Received');
logger.debug(`[connection-saga] Answer received in ${type} connection with ${publicKey}`);
setState(ConnectionSagaState.AnswerReceived);
return true;
},
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Timeout awaiting for Answer.');
setState(ConnectionSagaState.New);
return false;
},
);
}
async function gatherWebRtcAnswer(): Promise<WebRtcDescription> {
logger.debug(`[connection-saga] Gathering WebRTC answer data in ${type} connection with ${publicKey}`);
const answer = await getRtcPeerConnection().createAnswer();
await getRtcPeerConnection().setLocalDescription(answer);
return answer;
}
async function sendAnswer(): Promise<void> {
logger.debug(`[connection-saga] Sending Answer step in ${type} connection with ${publicKey}`);
setState(ConnectionSagaState.SendingAnswer);
const answerData = await gatherWebRtcAnswer();
const answerDataString = JSON.stringify(answerData);
const answerDataBytes = utf8.decode(answerDataString);
const answerDataEncrypted = cryptography.encrypt(answerDataBytes, getSharedSymmetricKey());
await callService.answer(
sessionService.signingPublicKeyBase64,
publicKey,
base64.encode(encryptionKeyPair.publicKey),
answerDataEncrypted,
);
setState(ConnectionSagaState.AnswerSent);
logger.debug(`[connection-saga] Answer sent in ${type} connection with ${publicKey}`);
}
async function awaitConnection(): Promise<boolean> {
logger.debug(`[connection-saga] Awaiting for Connection in ${type} connection with ${publicKey}`);
return await new Promise<void>(async (resolve, reject) => {
stepTimeout = setTimeout(reject, maxStepWaitMilliseconds);
setContinueCallback(resolve, 'Awaiting for Connection');
setState(ConnectionSagaState.AwaitingConnection);
}).then(
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Connection Established');
logger.debug(`[connection-saga] Connected in ${type} connection with ${publicKey}`);
return true;
},
() => {
clearTimeout(stepTimeout);
removeContinueCallback('Timeout awaiting for Connection.');
setState(ConnectionSagaState.New);
return false;
},
);
}
async function sendIce(candidate: WebRtcIceCandidate): Promise<void> {
const source = {
incoming: IceSource.Incoming,
outgoing: IceSource.Outgoing,
}[type];
const candidateString = JSON.stringify(candidate);
const candidateBytes = utf8.decode(candidateString);
const encryptedData = cryptography.encrypt(candidateBytes, getSharedSymmetricKey());
await callService.ice(
sessionService.signingPublicKeyBase64,
publicKey,
base64.encode(encryptionKeyPair.publicKey),
encryptedData,
source,
);
}
function initializePeerConnection(): void {
getRtcPeerConnection().onicecandidate = async (event) => {
if (event.candidate) {
const candidate = event.candidate.toJSON();
await sendIce({
candidate: candidate.candidate,
sdpMLineIndex: candidate.sdpMLineIndex,
sdpMid: candidate.sdpMid,
usernameFragment: candidate.usernameFragment,
});
logger.debug(`[connection-saga] ICE candidate found in ${type} connection with ${publicKey}`);
} else {
logger.debug(
`[connection-saga] ICE candidate collection completed in ${type} connection with ${publicKey}.`,
);
}
};
getRtcPeerConnection().ondatachannel = (event) => {
const dataChannel = event.channel;
rtcReceiveDataChannelSafeKiller = initializeDataChanel(dataChannel, 'receive');
rtcReceiveDataChannel = dataChannel;
};
}
function initializeDataChanel(dataChannel: RTCDataChannel, suffix: string): () => void {
logger.debug(`[connection-saga] [${dataChannel.id}] DataChannel-${suffix}(${dataChannel.label}) created`);
dataChannel.onopen = async () => {
if (state === ConnectionSagaState.Closed) {
dataChannel.close();
return;
}
await awaitStateGte(ConnectionSagaState.AwaitingConnection);
if (state === ConnectionSagaState.AwaitingConnection) {
saga.continue();
} else {
logger.debug(
`[connection-saga] Continue callback skipped. Expected state ${ConnectionSagaState[ConnectionSagaState.AwaitingConnection]}, got ${ConnectionSagaState[state]}`,
);
}
logger.debug(
`[connection-saga] ${suffix} dataChannel with label '${dataChannel.label}' opened in ${type} connection with ${publicKey}.`,
);
logger.debug(
`[connection-saga] ${suffix} dataChannel with label '${dataChannel.label}' ready state '${dataChannel.readyState}' in ${type} connection with ${publicKey}.`,
);
};
dataChannel.onmessage = (event) => {
if (!(event.data instanceof ArrayBuffer)) {
logger.warn(
`[connection-saga] Wrong message type received via ${suffix} dataChannel with label '${dataChannel.label}' in ${type} connection with ${publicKey}.`,
);
return;
}
const dataBytes = new Uint8Array(event.data);
const decryptedBytes = cryptography.decrypt(dataBytes, getSharedSymmetricKey());
let inflatedBytes: Uint8Array;
try {
inflatedBytes = ungzip(decryptedBytes);
} catch (err) {
logger.warn(`[connection-saga] Gzip decompression failed, using raw decrypted data.`, err);
inflatedBytes = decryptedBytes;
}
const message = utf8.encode(inflatedBytes);
new Promise<void>((resolve) => {
saga.onMessage?.call(saga, message);
resolve();
}).catch((err) => {
logger.error(`[connection-saga] Message callback error in ${type} connection with ${publicKey}.`, err);
});
};
return () => {
dataChannel.onopen = null;
dataChannel.onmessage = null;
dataChannel.close();
logger.debug(
`[connection-saga] ${suffix} dataChannel with label '${dataChannel.label}' has been safe killed.`,
);
};
}
function initializeRtc(dataChannelName: string): void {
if (rtcSendDataChannelSafeKiller !== undefined && rtcSendDataChannelSafeKiller !== null) {
rtcSendDataChannelSafeKiller();
}
if (rtcReceiveDataChannelSafeKiller !== undefined && rtcReceiveDataChannelSafeKiller !== null) {
rtcReceiveDataChannelSafeKiller();
}
if (_rtcPeerConnection !== undefined && _rtcPeerConnection !== null) {
_rtcPeerConnection.onicecandidate = null;
_rtcPeerConnection.ondatachannel = null;
_rtcPeerConnection.onconnectionstatechange = null;
_rtcPeerConnection.close();
}
_rtcPeerConnection = new webRTC.PeerConnection({ iceServers: iceServers });
initializePeerConnection();
const dataChannel = getRtcPeerConnection().createDataChannel(dataChannelName);
rtcSendDataChannelSafeKiller = initializeDataChanel(dataChannel, 'send');
_rtcSendDataChannel = dataChannel;
iceCandidates = [];
}
async function open(initialState: ConnectionSagaState): Promise<void> {
clearTimeout(stepTimeout);
setState(initialState);
initializeRtc(`${createdAt}:${type}:${publicKey}`);
if (state === ConnectionSagaState.AwaitDial && (await awaitDial())) {
setState(ConnectionSagaState.SendOffer);
}
if (state === ConnectionSagaState.SendDial) {
await sendDial();
setState(ConnectionSagaState.AwaitOffer);
}
if (state === ConnectionSagaState.AwaitOffer && (await awaitOffer())) {
setState(ConnectionSagaState.SendAnswer);
}
if (state === ConnectionSagaState.SendOffer) {
await sendOffer();
setState(ConnectionSagaState.AwaitAnswer);
}
if (state === ConnectionSagaState.AwaitAnswer && (await awaitAnswer())) {
setState(ConnectionSagaState.AwaitConnection);
}
if (state === ConnectionSagaState.SendAnswer) {
await sendAnswer();
setState(ConnectionSagaState.AwaitConnection);
}
if (state === ConnectionSagaState.AwaitConnection && (await awaitConnection())) {
setState(ConnectionSagaState.Connected);
}
if (state === ConnectionSagaState.Connected) {
let stats = await getRtcPeerConnection().getStats();
let candidatePair = [...stats.values()].find(
(s) => s.type == 'candidate-pair' && (s.selected === undefined || s.selected),
);
let candidate = stats.get(candidatePair.localCandidateId);
if (candidate.candidateType == 'relay') {
logger.warn(
`[connection-saga] Using relay server ${candidate.address} in ${type} connection with ${publicKey}.`,
);
} else {
logger.log(
`[connection-saga] Using P2P ${candidate.candidateType} in ${type} connection with ${publicKey}.`,
);
}
}
}
const saga: ConnectionSaga = {
get publicKey(): string {
return publicKey;
},
get state(): ConnectionSagaState {
return state;
},
get type(): ConnectionSagaType {
return type;
},
get continue(): () => void {
return () => {
if (!_continueCallback) {
throw newError(
logger,
`[connection-saga] Expected to have continue callback initialized in ${type} connection with ${publicKey} on state='${ConnectionSagaState[state]}'.`,
);
}
_continueCallback();
};
},
get abort(): () => void {
return () => {
setState(ConnectionSagaState.Closed);
if (_rtcSendDataChannel) {
try {
_rtcSendDataChannel.close();
logger.debug(
`[connection-saga] Sending DataChannel.close() called in ${type} connection with ${publicKey}.`,
);
} catch (error) {
logger.error(
`[connection-saga] Error closing sending DataChannel in ${type} connection.`,
error,
);
}
}
if (rtcReceiveDataChannel) {
try {
rtcReceiveDataChannel.close();
logger.debug(
`[connection-saga] Receiving DataChannel.close() called in ${type} connection with ${publicKey}.`,
);
} catch (error) {
logger.error(
`[connection-saga] Error closing receiving DataChannel in ${type} connection.`,
error,
);
}
}
if (_rtcPeerConnection) {
try {
_rtcPeerConnection.close();
logger.debug(
`[connection-saga] RTCPeerConnection.close() called in ${type} connection with ${publicKey}.`,
);
} catch (error) {
logger.error(
`[connection-saga] Error closing RTC peer connection in ${type} connection.`,
error,
);
}
}
};
},
onStateChanged: undefined,
onMessage: undefined,
async open(initialState: ConnectionSagaState): Promise<ConnectionSaga> {
await open(initialState);
return this;
},
setEncryption(encryptionPublicKeyBase64: string) {
logger.debug(`[connection-saga] Received encryption public key in ${type} connection with ${publicKey}`);
const encryptionPublicKey = base64.decode(encryptionPublicKeyBase64);
setSharedSymmetricKey(
cryptography.generateSharedSymmetricKey(encryptionPublicKey, encryptionKeyPair.secretKey),
);
logger.debug(
`[connection-saga] Created encryption shared symmetric key in ${type} connection with ${publicKey}`,
);
},
async setDescription(encryptedDataBase64: string): Promise<void> {
logger.debug(
`[connection-saga] Received remote WebRTC description in ${type} connection with ${publicKey}`,
);
if (getRtcPeerConnection().remoteDescription) {
logger.debug(
`[connection-saga] Remote WebRTC description ignored in ${type} connection with ${publicKey}. Remote WebRTC description already set.`,
);
return;
}
const encryptedDataBytes = base64.decode(encryptedDataBase64);
const remoteDataBytes = cryptography.decrypt(encryptedDataBytes, getSharedSymmetricKey());
const remoteDataString = utf8.encode(remoteDataBytes);
const remoteData = JSON.parse(remoteDataString);
const remoteDescription = remoteData as WebRtcDescription;
if (!remoteDescription) {
throw newError(
logger,
`[connection-saga] Wrong remote WebRTC description format in ${type} connection with ${publicKey}.`,
);
}
await getRtcPeerConnection().setRemoteDescription(remoteDescription);
for (const iceCandidate of iceCandidates) {
logger.debug(
`[connection-saga] Taking remote WebRTC ice candidate from cache in ${type} connection with with ${publicKey}.`,
);
await getRtcPeerConnection().addIceCandidate(iceCandidate);
}
logger.debug(`[connection-saga] Set remote WebRTC description in ${type} connection with ${publicKey}.`);
},
async addIceCandidate(encryptedDataBase64: string): Promise<void> {
logger.debug(
`[connection-saga] Received remote WebRTC ice candidate in ${type} connection with ${publicKey}`,
);
const encryptedDataBytes = base64.decode(encryptedDataBase64);
const remoteDataBytes = cryptography.decrypt(encryptedDataBytes, getSharedSymmetricKey());
const remoteDataString = utf8.encode(remoteDataBytes);
const remoteData = JSON.parse(remoteDataString);
const remoteIceCandidate = remoteData as WebRtcIceCandidate;
if (!remoteIceCandidate) {
throw newError(
logger,
`[connection-saga] Wrong remote WebRTC ice candidate format in ${type} connection with ${publicKey}.`,
);
}
if (getRtcPeerConnection().remoteDescription) {
await getRtcPeerConnection().addIceCandidate(remoteIceCandidate);
} else {
logger.debug(
`[connection-saga] Cached remote WebRTC ice candidate in ${type} connection with ${publicKey}. Remote description is not ready yet.`,
);
iceCandidates.push(remoteIceCandidate);
}
logger.debug(
`[connection-saga] Added remote WebRTC ice candidate in ${type} connection with ${publicKey}.`,
);
},
send(message: string): void {
try {
const data = message.trim();
if (!data) {
logger.debug(
`[connection-saga] Message is empty and won't be sent in ${type} connection with ${publicKey}.`,
);
return;
}
const dataBytes = utf8.decode(data);
const compressedBytes = gzip(dataBytes);
const dataEncrypted = cryptography.encrypt(compressedBytes, getSharedSymmetricKey());
getRtcSendDataChannel().send(new Uint8Array(dataEncrypted.buffer));
} catch (error) {
logger.error(`[connection-saga] Error sending data in ${type} connection with ${publicKey}.`);
}
},
};
return saga;
}
|