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import { CloseCallData } from '../models/close-call-data';
import { DialCallData } from '../models/dial-call-data';
import { IceCallData } from '../models/ice-call-data';
import { IceSource } from '../models/ice-source';
import { CallData } from '../models/infrasctructure/call-data';
import { CallMethodName } from '../models/infrasctructure/call-method-name';
import { CallRequest } from '../models/infrasctructure/call-request';
import { CallResponse } from '../models/infrasctructure/call-response';
import { OfferCallData } from '../models/offer-call-data';
import { UpdateCallData } from '../models/update-call-data';
import { ApiClient } from '../utils/api-client';
import { Base64 } from '../utils/base64';
import { Cryptography } from '../utils/cryptography';
import { Logger } from '../utils/logger';
import { newError } from '../utils/new-error';
import { Utf8 } from '../utils/utf8';
import { Subscription } from './push-service';
import { SessionService } from './session-service';
import { SignalRService } from './signalr-service';
import { TimeService } from './time-service';
/**
* Configuration interface for the call service.
* Defines properties needed for making API calls to the server.
*/
export type CallServiceConfig = {
/**
* URL of the server to send API calls to.
* Used for HTTP and SignalR communication.
*/
serverUrl?: string;
};
// Internal effective config for testability and browser API injection
// (not exported, just like PushServiceEffectiveConfig)
type CallServiceEffectiveConfig = CallServiceConfig & {
navigator: Navigator;
};
/**
* Service interface for making various types of signaling calls.
* Provides methods for the WebRTC signaling process and connection management.
*/
export interface CallService {
/**
* Initializes the call service with the provided configuration.
* Sets up the server URL for API calls.
*
* @param config - Configuration with server URL and optional browser API overrides
*/
initialize(config: CallServiceEffectiveConfig): void;
/**
* Updates the server with the client's current status and subscription information.
* Used to register the client for push notifications.
*
* @param publicKey - Public key of the client
* @param subscription - Optional push notification subscription details
* @returns Promise resolving to the server's response
*/
update(publicKey: string, subscription?: Subscription): Promise<CallResponse>;
/**
* Initiates a dial request to a peer.
* First step in establishing a WebRTC connection.
*
* @param publicKey - Public key of the sender
* @param peerPublicKey - Public key of the peer to connect to
* @param encryptionPublicKey - Public encryption key for secure communication
* @returns Promise resolving to the server's response
*/
dial(publicKey: string, peerPublicKey: string, encryptionPublicKey: string): Promise<CallResponse>;
/**
* Sends a WebRTC offer to a peer.
* Contains the initial session description for establishing a connection.
*
* @param publicKey - Public key of the sender
* @param peerPublicKey - Public key of the peer to connect to
* @param encryptionPublicKey - Public encryption key for secure communication
* @param encryptedData - Encrypted session description information
* @returns Promise resolving to the server's response
*/
offer(
publicKey: string,
peerPublicKey: string,
encryptionPublicKey: string,
encryptedData: Uint8Array,
): Promise<CallResponse>;
/**
* Sends a WebRTC answer to a peer.
* Response to an offer with the local session description.
*
* @param publicKey - Public key of the sender
* @param peerPublicKey - Public key of the peer to connect to
* @param encryptionPublicKey - Public encryption key for secure communication
* @param encryptedData - Encrypted session description information
* @returns Promise resolving to the server's response
*/
answer(
publicKey: string,
peerPublicKey: string,
encryptionPublicKey: string,
encryptedData: Uint8Array,
): Promise<CallResponse>;
/**
* Sends ICE (Interactive Connectivity Establishment) candidates to a peer.
* Used to establish the optimal connection path between peers.
*
* @param publicKey - Public key of the sender
* @param peerPublicKey - Public key of the peer to connect to
* @param encryptionPublicKey - Public encryption key for secure communication
* @param encryptedData - Encrypted ICE candidate information
* @param source - Source of the ICE candidate (incoming or outgoing)
* @returns Promise resolving to the server's response
*/
ice(
publicKey: string,
peerPublicKey: string,
encryptionPublicKey: string,
encryptedData: Uint8Array,
source: IceSource,
): Promise<CallResponse>;
/**
* Sends a close request to terminate a connection with a peer.
* Uses the Beacon API for reliable delivery even during page unload.
*
* @param publicKey - Public key of the sender
* @param peerPublicKey - Public key of the peer to disconnect from
*/
close(publicKey: string, peerPublicKey: string): void;
}
/**
* Factory function that creates and returns an implementation of the CallService interface.
* Manages the signaling process for WebRTC connections.
*
* @param logger - Logger instance for error and debugging information
* @param timeService - Service for managing time synchronization
* @param sessionService - Service for accessing session information
* @param apiClient - Client for making HTTP API calls
* @param signalRService - Service for real-time SignalR communication
* @param base64 - Utility for Base64 encoding/decoding
* @param utf8 - Utility for UTF-8 encoding/decoding
* @param cryptography - Cryptography service for signing operations
* @returns An implementation of the CallService interface
*/
export function getCallService(
logger: Logger,
timeService: TimeService,
sessionService: SessionService,
apiClient: ApiClient,
signalRService: SignalRService,
base64: Base64,
utf8: Utf8,
cryptography: Cryptography,
): CallService {
let serverUrl: string | undefined;
let navigator: Navigator;
function getBase64Signature(data: any): string {
const dataString = JSON.stringify(data);
const dataBytes = utf8.decode(dataString);
const signatureSecretKey = sessionService.signingKeyPair.secretKey;
const dataSignature = cryptography.sign(dataBytes, signatureSecretKey);
return base64.encode(dataSignature);
}
async function signAndSend<TypeData extends CallData>(
method: CallMethodName,
data: TypeData,
): Promise<CallResponse> {
async function sendViaApi<TypeData extends CallData>(request: CallRequest<TypeData>): Promise<CallResponse> {
if (!serverUrl) {
throw newError(logger, '[call-service] Server URL is missing.');
}
return await apiClient.call(serverUrl, request);
}
const request = {
a: method,
b: data,
c: getBase64Signature(data),
};
let response: CallResponse;
try {
response = await signalRService.call(request);
} catch (error) {
logger.warn(
`[call-service] Error while sending call '${request.a}' via signalR. Trying to use http API.`,
error,
);
response = await sendViaApi<TypeData>(request);
}
timeService.serverTime = response.timestamp;
return response;
}
return {
initialize(config: CallServiceEffectiveConfig): void {
serverUrl = config.serverUrl;
navigator = config.navigator;
logger.debug('[call-service] Initialized.');
},
async update(publicKey: string, subscription?: Subscription): Promise<CallResponse> {
const data: UpdateCallData = {
a: publicKey,
b: !!subscription
? {
a: subscription.endpoint,
b: subscription.expirationTime,
c: {
a: subscription.keys.p256dh,
b: subscription.keys.auth,
},
}
: undefined,
};
return await signAndSend<UpdateCallData>('update', data);
},
async dial(publicKey: string, peerPublicKey: string, encryptionPublicKeyBase64: string): Promise<CallResponse> {
const data: DialCallData = {
a: publicKey,
b: timeService.serverTime,
c: peerPublicKey,
d: encryptionPublicKeyBase64,
};
return await signAndSend<DialCallData>('dial', data);
},
async offer(
publicKey: string,
peerPublicKey: string,
encryptionPublicKeyBase64: string,
encryptedData: Uint8Array,
): Promise<CallResponse> {
const encryptedDataBase64 = base64.encode(encryptedData);
const data: OfferCallData = {
a: publicKey,
b: timeService.serverTime,
c: peerPublicKey,
d: encryptionPublicKeyBase64,
e: encryptedDataBase64,
};
return await signAndSend<OfferCallData>('offer', data);
},
async answer(
publicKey: string,
peerPublicKey: string,
encryptionPublicKeyBase64: string,
encryptedData: Uint8Array,
): Promise<CallResponse> {
const encryptedDataBase64 = base64.encode(encryptedData);
const data: AnswerCallData = {
a: publicKey,
b: timeService.serverTime,
c: peerPublicKey,
d: encryptionPublicKeyBase64,
e: encryptedDataBase64,
};
return await signAndSend<AnswerCallData>('answer', data);
},
async ice(
publicKey: string,
peerPublicKey: string,
encryptionPublicKeyBase64: string,
encryptedData: Uint8Array,
source: IceSource,
): Promise<CallResponse> {
const encryptedDataBase64 = base64.encode(encryptedData);
const data: IceCallData = {
a: publicKey,
b: timeService.serverTime,
c: peerPublicKey,
d: encryptionPublicKeyBase64,
e: encryptedDataBase64,
f: source,
};
return await signAndSend<IceCallData>('ice', data);
},
close(publicKey: string, peerPublicKey: string): void {
const data: CloseCallData = {
a: publicKey,
b: timeService.serverTime,
c: peerPublicKey,
};
const request: CallRequest<CloseCallData> = {
a: 'close',
b: data,
c: getBase64Signature(data),
};
const headers = {
type: 'application/json',
};
const blob = new Blob([JSON.stringify(request)], headers);
navigator.sendBeacon(`${serverUrl}/api/v1/call`, blob);
},
};
}
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