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import { Cryptography } 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 { ConnectionSaga, ConnectionSagaState, ConnectionSagaType, getConnectionSaga } from './connection-saga';
import { IceServer } from './ice-server';
import { WebRTC } from './web-rtc';
/**
* Enumeration representing the possible states of a peer connection.
* Used to track the lifecycle of WebRTC connections.
*/
export enum ConnectionState {
/** Initial state before any connection attempt */
New = 'new',
/** Connection is in the process of being established */
Connecting = 'connecting',
/** Connection has been successfully established */
Open = 'open',
/** Connection has been terminated */
Closed = 'closed',
}
/**
* Public interface for a peer-to-peer connection.
* Provides methods for managing the connection lifecycle and sending messages.
*/
export interface Connection {
/**
* Gets the public key of the peer this connection is established with.
*
* @returns The peer's public key as a string
*/
get publicKey(): string;
/**
* Gets the current state of the connection.
*
* @returns The connection state (New, Connecting, Open, or Closed)
*/
get state(): ConnectionState;
/**
* Initiates the connection establishment process.
* Starts the WebRTC signaling process to connect to the peer.
*
* @returns Promise resolving to the connection object when opened
*/
open(): Promise<ConnectionInternal>;
/**
* Sends a text message to the peer over the established connection.
*
* @param message - The message to send
*/
send(message: string): void;
/**
* Terminates the connection with the peer.
*/
close(): void;
/**
* Gets the callback for connection progress updates.
*
* @returns The progress callback function or undefined if not set
*/
get onProgress(): ((progress: number) => void) | undefined;
/**
* Sets the callback for connection progress updates.
*
* @param onProgress - Function to call with progress updates (0-100)
*/
set onProgress(onProgress: ((progress: number) => void) | undefined);
/**
* Gets the callback for connection state changes.
*
* @returns The state change callback function or undefined if not set
*/
get onStateChanged(): ((from: ConnectionState, to: ConnectionState) => void) | undefined;
/**
* Sets the callback for connection state changes.
*
* @param onStateChange - Function to call when the connection state changes
*/
set onStateChanged(onStateChange: ((from: ConnectionState, to: ConnectionState) => void) | undefined);
/**
* Gets the callback for received messages.
*
* @returns The message callback function or undefined if not set
*/
get onMessage(): ((message: string) => void) | undefined;
/**
* Sets the callback for received messages.
*
* @param onMessage - Function to call when a message is received
*/
set onMessage(onMessage: ((message: string) => void) | undefined);
}
/**
* Extended interface for internal connection management.
* Provides additional methods for handling the WebRTC connection establishment process.
*/
export interface ConnectionInternal {
/**
* Callback for connection progress updates.
*/
onProgress?: (progress: number) => void;
/**
* Callback for connection state changes.
*/
onStateChanged?: (from: ConnectionState, to: ConnectionState) => void;
/**
* Callback for received messages.
*/
onMessage?: (message: string) => void;
/**
* Gets the timestamp when the connection was opened.
*
* @returns The timestamp in milliseconds or undefined if not yet opened
*/
get openedAt(): number | undefined;
/**
* Gets the public key of the peer this connection is established with.
*
* @returns The peer's public key as a string
*/
get publicKey(): string;
/**
* Gets the current state of the connection.
*
* @returns The connection state (New, Connecting, Open, or Closed)
*/
get state(): ConnectionState;
/**
* Gets the current state of the incoming connection saga.
*
* @returns The state of the incoming connection process
*/
get incomingState(): ConnectionSagaState;
/**
* Gets the current state of the outgoing connection saga.
*
* @returns The state of the outgoing connection process
*/
get outgoingState(): ConnectionSagaState;
/**
* Sends a text message to the peer over the established connection.
*
* @param message - The message to send
*/
send(message: string): void;
/**
* Initiates the incoming connection establishment process.
*
* @returns Promise resolving to the connection object when opened
*/
openIncoming(): Promise<ConnectionInternal>;
/**
* Initiates the outgoing connection establishment process.
*
* @returns Promise resolving to the connection object when opened
*/
openOutgoing(): Promise<ConnectionInternal>;
/**
* Terminates the connection with the peer.
*/
close(): void;
/**
* Continues the incoming connection process to the next state.
*/
continueIncoming(): void;
/**
* Continues the outgoing connection process to the next state.
*/
continueOutgoing(): void;
/**
* Sets the encryption key for the incoming connection.
*
* @param encryptionPublicKeyBase64 - Base64-encoded public encryption key
*/
setIncomingEncryption(encryptionPublicKeyBase64: string): void;
/**
* Sets the encryption key for the outgoing connection.
*
* @param encryptionPublicKeyBase64 - Base64-encoded public encryption key
*/
setOutgoingEncryption(encryptionPublicKeyBase64: string): void;
/**
* Sets the session description for the incoming connection.
*
* @param encryptedDataBase64 - Base64-encoded encrypted session description
* @returns Promise that resolves when the description is set
*/
setIncomingDescription(encryptedDataBase64: string): Promise<void>;
/**
* Sets the session description for the outgoing connection.
*
* @param encryptedDataBase64 - Base64-encoded encrypted session description
* @returns Promise that resolves when the description is set
*/
setOutgoingDescription(encryptedDataBase64: string): Promise<void>;
/**
* Adds an ICE candidate to the incoming connection.
*
* @param encryptedDataBase64 - Base64-encoded encrypted ICE candidate
* @returns Promise that resolves when the ICE candidate is added
*/
addIncomingIce(encryptedDataBase64: string): Promise<void>;
/**
* Adds an ICE candidate to the outgoing connection.
*
* @param encryptedDataBase64 - Base64-encoded encrypted ICE candidate
* @returns Promise that resolves when the ICE candidate is added
*/
addOutgoingIce(encryptedDataBase64: string): Promise<void>;
}
/**
* Converts an internal connection object to the public Connection interface.
* Hides internal methods and properties that should not be exposed to consumers.
*
* @param connection - The internal connection object to translate
* @returns A public Connection interface for the same connection
*/
export function translateConnection(connection: ConnectionInternal): Connection {
return {
get publicKey(): string {
return connection.publicKey;
},
get state(): ConnectionState {
return connection.state;
},
open(): Promise<ConnectionInternal> {
return connection.openOutgoing();
},
send(message: string) {
connection.send(message);
},
close() {
connection.close();
},
get onProgress(): ((progress: number) => void) | undefined {
return connection.onProgress;
},
set onProgress(onProgress: ((progress: number) => void) | undefined) {
connection.onProgress = onProgress;
},
get onStateChanged(): ((from: ConnectionState, to: ConnectionState) => void) | undefined {
return connection.onStateChanged;
},
set onStateChanged(onStateChange: ((from: ConnectionState, to: ConnectionState) => void) | undefined) {
connection.onStateChanged = onStateChange;
},
get onMessage(): ((message: string) => void) | undefined {
return connection.onMessage;
},
set onMessage(onMessage: ((message: string) => void) | undefined) {
connection.onMessage = onMessage;
},
};
}
/**
* Factory function that creates and returns an implementation of the ConnectionInternal interface.
* Manages the WebRTC connection establishment and message exchange between peers.
*
* @param publicKey - Public key of the peer to connect to
* @param logger - Logger instance for error and debugging information
* @param timeService - Service for managing time synchronization
* @param callService - Service for making signaling calls
* @param sessionService - Service for accessing session information
* @param base64 - Utility for Base64 encoding/decoding
* @param utf8 - Utility for UTF-8 encoding/decoding
* @param cryptography - Cryptography service for encryption operations
* @param webRTC - WebRTC interface implementation
* @param iceServers - Optional array of ICE server configurations
* @returns An implementation of the ConnectionInternal interface
*/
export function getConnection(
publicKey: string,
logger: Logger,
timeService: TimeService,
callService: CallService,
sessionService: SessionService,
base64: Base64,
utf8: Utf8,
cryptography: Cryptography,
webRTC: WebRTC,
iceServers?: IceServer[],
): ConnectionInternal {
let openedAt: number | undefined;
let state: ConnectionState = ConnectionState.New;
let incomingSaga = createConnectionSaga('incoming');
let outgoingSaga = createConnectionSaga('outgoing');
function createConnectionSaga(type: ConnectionSagaType) {
return getConnectionSaga(
publicKey,
type,
logger,
timeService,
callService,
sessionService,
base64,
utf8,
cryptography,
webRTC,
iceServers,
);
}
function connectionOnProgress(progress: number): void {
new Promise<void>((resolve) => {
if (connection.onProgress !== undefined && connection.onProgress !== null) {
connection.onProgress(progress);
}
resolve();
}).catch((err) => {
logger.error(`[connection] Progress callback error in connection with ${connection.publicKey}.`, err);
});
}
function connectionOnStateChange(from: ConnectionState, to: ConnectionState): void {
new Promise<void>((resolve) => {
connection.onStateChanged?.call(connection, from, to);
resolve();
}).catch((err) => {
logger.error(`[connection] State change callback error in connection with ${connection.publicKey}.`, err);
});
}
function connectionOnMessage(message: string) {
new Promise<void>((resolve) => {
connection.onMessage?.call(connection, message);
resolve();
}).catch((err) => {
logger.error(`[connection] Message callback error in connection with ${connection.publicKey}.`, err);
});
}
function getConnectionSagaOnStateChanged(type: ConnectionSagaType) {
return (from: ConnectionSagaState, to: ConnectionSagaState) => {
const old = state;
const actual = connection.state;
if (old !== actual) {
connectionOnStateChange(old, actual);
logger.debug(
`[connection] State changed in connection with ${connection.publicKey} from ${old} to ${actual}.`,
);
}
if (from !== to) {
logger.debug(
`[connection-saga] State changed in ${type} connection saga with ${connection.publicKey} from ${ConnectionSagaState[from]} to ${ConnectionSagaState[to]}.`,
);
}
const { state: incomingState } = incomingSaga;
const { state: outgoingState } = outgoingSaga;
const progress = Math.min(
Math.ceil((Math.max(incomingState, outgoingState) * 100) / ConnectionSagaState.Connected),
100,
);
logger.debug(`[connection] Progress in connection with ${connection.publicKey}: ${progress}%.`);
connectionOnProgress(progress);
};
}
function getSaga(): ConnectionSaga | undefined {
if (incomingSaga.state === ConnectionSagaState.Connected) {
return incomingSaga;
}
if (outgoingSaga.state === ConnectionSagaState.Connected) {
return outgoingSaga;
}
return undefined;
}
async function open(
incomingInitialState: ConnectionSagaState,
outgoingInitialState: ConnectionSagaState,
): Promise<void> {
openedAt = timeService.serverTime;
const sagas = await Promise.all([
incomingSaga.open(incomingInitialState),
outgoingSaga.open(outgoingInitialState),
]);
logger.debug(
`[connection] Saga states: ${sagas[0].type}=${ConnectionSagaState[sagas[0].state]}; ${sagas[1].type}=${ConnectionSagaState[sagas[1].state]}`,
);
}
incomingSaga.onMessage = connectionOnMessage;
outgoingSaga.onMessage = connectionOnMessage;
incomingSaga.onStateChanged = getConnectionSagaOnStateChanged(incomingSaga.type);
outgoingSaga.onStateChanged = getConnectionSagaOnStateChanged(outgoingSaga.type);
const connection: ConnectionInternal = {
get openedAt(): number | undefined {
return openedAt;
},
get publicKey(): string {
return publicKey;
},
get state(): ConnectionState {
const { state: inState } = incomingSaga;
const { state: outState } = outgoingSaga;
if (inState === ConnectionSagaState.Closed || outState === ConnectionSagaState.Closed) {
state = ConnectionState.Closed;
} else if (inState === ConnectionSagaState.Connected || outState === ConnectionSagaState.Connected) {
state = ConnectionState.Open;
} else if (inState === ConnectionSagaState.New && outState === ConnectionSagaState.New) {
state = ConnectionState.New;
} else {
state = ConnectionState.Connecting;
}
return state;
},
get incomingState() {
return incomingSaga.state;
},
get outgoingState() {
return outgoingSaga.state;
},
onProgress: undefined,
onStateChanged: undefined,
onMessage: undefined,
send(message: string) {
const saga = getSaga();
if (!saga) {
throw newError(logger, '[connection] Connection is not ready yet.');
}
saga.send(message);
},
async openIncoming(): Promise<ConnectionInternal> {
await open(ConnectionSagaState.SendOffer, ConnectionSagaState.SendDial);
return this;
},
async openOutgoing(): Promise<ConnectionInternal> {
await open(ConnectionSagaState.AwaitDial, ConnectionSagaState.SendDial);
return this;
},
/**
* Terminates the connection with the peer.
*/
close(): void {
callService.close(sessionService.signingPublicKeyBase64, this.publicKey);
incomingSaga.abort();
outgoingSaga.abort();
},
continueIncoming(): void {
incomingSaga.continue();
},
continueOutgoing(): void {
outgoingSaga.continue();
},
setIncomingEncryption(encryptionPublicKeyBase64: string): void {
incomingSaga.setEncryption(encryptionPublicKeyBase64);
},
setOutgoingEncryption(encryptionPublicKeyBase64: string): void {
outgoingSaga.setEncryption(encryptionPublicKeyBase64);
},
async setIncomingDescription(encryptedDataBase64: string): Promise<void> {
await incomingSaga.setDescription(encryptedDataBase64);
},
async setOutgoingDescription(encryptedDataBase64: string): Promise<void> {
await outgoingSaga.setDescription(encryptedDataBase64);
},
async addIncomingIce(encryptedDataBase64: string): Promise<void> {
await incomingSaga.addIceCandidate(encryptedDataBase64);
},
async addOutgoingIce(encryptedDataBase64: string): Promise<void> {
await outgoingSaga.addIceCandidate(encryptedDataBase64);
},
};
return connection;
}
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