793 lines
22 KiB
TypeScript
793 lines
22 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import URL from 'url';
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import type { RequestInit, Response } from 'node-fetch';
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import { Headers } from 'node-fetch';
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import type { connection as WebSocket } from 'websocket';
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import qs from 'querystring';
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import EventListener from 'events';
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import { AbortableProcess } from '../util/AbortableProcess';
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import { strictAssert } from '../util/assert';
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import { BackOff, FIBONACCI_TIMEOUTS } from '../util/BackOff';
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import * as durations from '../util/durations';
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import { sleep } from '../util/sleep';
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import { createProxyAgent } from '../util/createProxyAgent';
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import { SocketStatus } from '../types/SocketStatus';
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import * as Errors from '../types/errors';
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import * as Bytes from '../Bytes';
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import * as log from '../logging/log';
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import type {
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IncomingWebSocketRequest,
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IWebSocketResource,
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WebSocketResourceOptions,
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} from './WebsocketResources';
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import WebSocketResource, {
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LibsignalWebSocketResource,
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TransportOption,
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WebSocketResourceWithShadowing,
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} from './WebsocketResources';
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import { HTTPError } from './Errors';
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import type { IRequestHandler, WebAPICredentials } from './Types.d';
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import { connect as connectWebSocket } from './WebSocket';
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import { isAlpha, isBeta, isStaging } from '../util/version';
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const FIVE_MINUTES = 5 * durations.MINUTE;
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const JITTER = 5 * durations.SECOND;
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export const UNAUTHENTICATED_CHANNEL_NAME = 'unauthenticated';
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export const AUTHENTICATED_CHANNEL_NAME = 'authenticated';
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export type SocketManagerOptions = Readonly<{
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url: string;
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artCreatorUrl: string;
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certificateAuthority: string;
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version: string;
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proxyUrl?: string;
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hasStoriesDisabled: boolean;
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}>;
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// This class manages two websocket resources:
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//
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// - Authenticated IWebSocketResource which uses supplied WebAPICredentials and
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// automatically reconnects on closed socket (using back off)
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// - Unauthenticated IWebSocketResource that is created on the first outgoing
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// unauthenticated request and is periodically rotated (5 minutes since first
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// activity on the socket).
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//
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// Incoming requests on authenticated resource are funneled into the registered
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// request handlers (`registerRequestHandler`) or queued internally until at
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// least one such request handler becomes available.
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//
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// Incoming requests on unauthenticated resource are not currently supported.
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// IWebSocketResource is responsible for their immediate termination.
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export class SocketManager extends EventListener {
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private backOff = new BackOff(FIBONACCI_TIMEOUTS, {
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jitter: JITTER,
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});
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private authenticated?: AbortableProcess<IWebSocketResource>;
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private unauthenticated?: AbortableProcess<IWebSocketResource>;
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private unauthenticatedExpirationTimer?: NodeJS.Timeout;
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private credentials?: WebAPICredentials;
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private readonly proxyAgent?: ReturnType<typeof createProxyAgent>;
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private status = SocketStatus.CLOSED;
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private requestHandlers = new Set<IRequestHandler>();
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private incomingRequestQueue = new Array<IncomingWebSocketRequest>();
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private isOffline = false;
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private hasStoriesDisabled: boolean;
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constructor(private readonly options: SocketManagerOptions) {
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super();
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if (options.proxyUrl) {
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this.proxyAgent = createProxyAgent(options.proxyUrl);
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}
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this.hasStoriesDisabled = options.hasStoriesDisabled;
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}
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public getStatus(): SocketStatus {
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return this.status;
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}
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// Update WebAPICredentials and reconnect authenticated resource if
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// credentials changed
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public async authenticate(credentials: WebAPICredentials): Promise<void> {
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if (this.isOffline) {
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throw new HTTPError('SocketManager offline', {
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code: 0,
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headers: {},
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stack: new Error().stack,
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});
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}
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const { username, password } = credentials;
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if (!username && !password) {
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log.warn('SocketManager authenticate was called without credentials');
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return;
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}
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if (
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this.credentials &&
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this.credentials.username === username &&
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this.credentials.password === password &&
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this.authenticated
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) {
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try {
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await this.authenticated.getResult();
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} catch (error) {
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log.warn(
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'SocketManager: failed to wait for existing authenticated socket ' +
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` due to error: ${Errors.toLogFormat(error)}`
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);
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}
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return;
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}
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this.credentials = credentials;
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log.info(
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'SocketManager: connecting authenticated socket ' +
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`(hasStoriesDisabled=${this.hasStoriesDisabled})`
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);
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this.setStatus(SocketStatus.CONNECTING);
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const process = this.connectResource({
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name: AUTHENTICATED_CHANNEL_NAME,
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path: '/v1/websocket/',
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query: { login: username, password },
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resourceOptions: {
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name: AUTHENTICATED_CHANNEL_NAME,
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keepalive: { path: '/v1/keepalive' },
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handleRequest: (req: IncomingWebSocketRequest): void => {
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this.queueOrHandleRequest(req);
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},
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},
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extraHeaders: {
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'X-Signal-Receive-Stories': String(!this.hasStoriesDisabled),
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},
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});
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// Cancel previous connect attempt or close socket
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this.authenticated?.abort();
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this.authenticated = process;
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const reconnect = async (): Promise<void> => {
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const timeout = this.backOff.getAndIncrement();
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log.info(
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'SocketManager: reconnecting authenticated socket ' +
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`after ${timeout}ms`
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);
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await sleep(timeout);
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if (this.isOffline) {
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log.info('SocketManager: cancelled reconnect because we are offline');
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return;
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}
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if (this.authenticated) {
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log.info('SocketManager: authenticated socket already reconnected');
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return;
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}
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strictAssert(this.credentials !== undefined, 'Missing credentials');
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try {
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await this.authenticate(this.credentials);
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} catch (error) {
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log.info(
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'SocketManager: authenticated socket failed to reconnect ' +
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`due to error ${Errors.toLogFormat(error)}`
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);
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return reconnect();
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}
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};
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let authenticated: IWebSocketResource;
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try {
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authenticated = await process.getResult();
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this.setStatus(SocketStatus.OPEN);
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} catch (error) {
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log.warn(
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'SocketManager: authenticated socket connection failed with ' +
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`error: ${Errors.toLogFormat(error)}`
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);
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// The socket was deliberately closed, don't follow up
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if (this.authenticated !== process) {
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return;
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}
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this.dropAuthenticated(process);
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if (error instanceof HTTPError) {
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const { code } = error;
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if (code === 401 || code === 403) {
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this.emit('authError', error);
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return;
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}
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if (!(code >= 500 && code <= 599) && code !== -1) {
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// No reconnect attempt should be made
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return;
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}
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if (code === -1) {
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this.emit('connectError');
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}
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}
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void reconnect();
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return;
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}
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log.info(
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`SocketManager: connected authenticated socket (localPort: ${authenticated.localPort()})`
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);
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window.logAuthenticatedConnect?.();
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this.backOff.reset();
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authenticated.addEventListener('close', ({ code, reason }): void => {
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if (this.authenticated !== process) {
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return;
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}
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log.warn(
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'SocketManager: authenticated socket closed ' +
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`with code=${code} and reason=${reason}`
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);
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this.dropAuthenticated(process);
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if (code === 3000) {
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// Intentional disconnect
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return;
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}
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if (code === 4409) {
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this.emit('deviceConflict');
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return;
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}
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void reconnect();
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});
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}
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// Either returns currently connecting/active authenticated
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// IWebSocketResource or connects a fresh one.
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public async getAuthenticatedResource(): Promise<IWebSocketResource> {
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if (!this.authenticated) {
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strictAssert(this.credentials !== undefined, 'Missing credentials');
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await this.authenticate(this.credentials);
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}
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strictAssert(this.authenticated !== undefined, 'Authentication failed');
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return this.authenticated.getResult();
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}
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// Creates new IWebSocketResource for AccountManager's provisioning
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public async getProvisioningResource(
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handler: IRequestHandler
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): Promise<IWebSocketResource> {
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return this.connectResource({
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name: 'provisioning',
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path: '/v1/websocket/provisioning/',
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resourceOptions: {
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name: 'provisioning',
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handleRequest: (req: IncomingWebSocketRequest): void => {
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handler.handleRequest(req);
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},
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keepalive: { path: '/v1/keepalive/provisioning' },
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},
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}).getResult();
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}
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// Creates new WebSocket for Art Creator provisioning
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public async connectExternalSocket({
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url,
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extraHeaders,
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}: {
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url: string;
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extraHeaders?: Record<string, string>;
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}): Promise<WebSocket> {
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return connectWebSocket({
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name: 'art-creator-provisioning',
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url,
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version: this.options.version,
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proxyAgent: this.proxyAgent,
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extraHeaders,
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createResource(socket: WebSocket): WebSocket {
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return socket;
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},
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}).getResult();
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}
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// Fetch-compatible wrapper around underlying unauthenticated/authenticated
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// websocket resources. This wrapper supports only limited number of features
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// of node-fetch despite being API compatible.
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public async fetch(url: string, init: RequestInit): Promise<Response> {
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const headers = new Headers(init.headers);
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let resource: IWebSocketResource;
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if (this.isAuthenticated(headers)) {
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resource = await this.getAuthenticatedResource();
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} else {
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resource = await this.getUnauthenticatedResource();
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await this.startUnauthenticatedExpirationTimer(resource);
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}
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const { path } = URL.parse(url);
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strictAssert(path, "Fetch can't have empty path");
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const { method = 'GET', body, timeout } = init;
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let bodyBytes: Uint8Array | undefined;
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if (body === undefined) {
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bodyBytes = undefined;
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} else if (body instanceof Uint8Array) {
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bodyBytes = body;
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} else if (body instanceof ArrayBuffer) {
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throw new Error('Unsupported body type: ArrayBuffer');
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} else if (typeof body === 'string') {
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bodyBytes = Bytes.fromString(body);
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} else {
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throw new Error(`Unsupported body type: ${typeof body}`);
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}
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return resource.sendRequest({
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verb: method,
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path,
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body: bodyBytes,
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headers: Array.from(headers.entries()),
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timeout,
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});
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}
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public registerRequestHandler(handler: IRequestHandler): void {
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this.requestHandlers.add(handler);
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const queue = this.incomingRequestQueue;
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if (queue.length === 0) {
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return;
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}
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log.info(
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`SocketManager: processing ${queue.length} queued incoming requests`
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);
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this.incomingRequestQueue = [];
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for (const req of queue) {
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this.queueOrHandleRequest(req);
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}
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}
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public unregisterRequestHandler(handler: IRequestHandler): void {
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this.requestHandlers.delete(handler);
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}
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public async onHasStoriesDisabledChange(newValue: boolean): Promise<void> {
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if (this.hasStoriesDisabled === newValue) {
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return;
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}
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this.hasStoriesDisabled = newValue;
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log.info(
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`SocketManager: reconnecting after setting hasStoriesDisabled=${newValue}`
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);
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await this.reconnect();
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}
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public async reconnect(): Promise<void> {
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log.info('SocketManager.reconnect: starting...');
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this.onOffline();
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await this.onOnline();
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log.info('SocketManager.reconnect: complete.');
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}
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// Force keep-alive checks on WebSocketResources
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public async check(): Promise<void> {
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if (this.isOffline) {
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return;
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}
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log.info('SocketManager.check');
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await Promise.all([
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SocketManager.checkResource(this.authenticated),
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SocketManager.checkResource(this.unauthenticated),
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]);
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}
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// Puts SocketManager into "online" state and reconnects the authenticated
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// IWebSocketResource (if there are valid credentials)
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public async onOnline(): Promise<void> {
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log.info('SocketManager.onOnline');
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this.isOffline = false;
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if (this.credentials) {
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await this.authenticate(this.credentials);
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}
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}
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// Puts SocketManager into "offline" state and gracefully disconnects both
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// unauthenticated and authenticated resources.
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public onOffline(): void {
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log.info('SocketManager.onOffline');
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this.isOffline = true;
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const { authenticated, unauthenticated } = this;
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if (authenticated) {
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authenticated.abort();
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this.dropAuthenticated(authenticated);
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}
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if (unauthenticated) {
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unauthenticated.abort();
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this.dropUnauthenticated(unauthenticated);
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}
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}
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public async logout(): Promise<void> {
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const { authenticated } = this;
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if (authenticated) {
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authenticated.abort();
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this.dropAuthenticated(authenticated);
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}
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this.credentials = undefined;
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}
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//
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// Private
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//
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private setStatus(status: SocketStatus): void {
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if (this.status === status) {
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return;
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}
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this.status = status;
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this.emit('statusChange');
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}
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private transportOption(): TransportOption {
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const { hostname } = URL.parse(this.options.url);
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// transport experiment doesn't support proxy
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if (
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this.proxyAgent ||
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hostname == null ||
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!hostname.endsWith('signal.org')
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) {
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return TransportOption.Original;
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}
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// in staging, switch to using libsignal transport
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if (isStaging(this.options.version)) {
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return TransportOption.Libsignal;
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}
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// in alpha, switch to using libsignal transport, unless user opts out,
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// in which case switching to shadowing
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if (isAlpha(this.options.version)) {
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const configValue = window.Signal.RemoteConfig.isEnabled(
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'desktop.experimentalTransportEnabled.alpha'
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);
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return configValue
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? TransportOption.Libsignal
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: TransportOption.ShadowingHigh;
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}
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// in beta, switch to using 'ShadowingHigh' mode, unless user opts out,
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// in which case switching to `ShadowingLow`
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if (isBeta(this.options.version)) {
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const configValue = window.Signal.RemoteConfig.isEnabled(
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'desktop.experimentalTransportEnabled.beta'
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);
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return configValue
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? TransportOption.ShadowingHigh
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: TransportOption.ShadowingLow;
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}
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// in prod, using original
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return TransportOption.ShadowingLow;
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}
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private connectLibsignalUnauthenticated(): AbortableProcess<IWebSocketResource> {
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return new AbortableProcess<IWebSocketResource>(
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`WebSocket.connect(libsignal.${UNAUTHENTICATED_CHANNEL_NAME})`,
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{
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abort() {
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// noop
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},
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},
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Promise.resolve(new LibsignalWebSocketResource(this.options.version))
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);
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}
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private async getUnauthenticatedResource(): Promise<IWebSocketResource> {
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if (this.isOffline) {
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throw new HTTPError('SocketManager offline', {
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code: 0,
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headers: {},
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stack: new Error().stack,
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});
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}
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if (this.unauthenticated) {
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return this.unauthenticated.getResult();
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}
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const transportOption = this.transportOption();
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log.info(
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`SocketManager: connecting unauthenticated socket, transport option [${transportOption}]`
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);
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if (transportOption === TransportOption.Libsignal) {
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this.unauthenticated = this.connectLibsignalUnauthenticated();
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return this.unauthenticated.getResult();
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}
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const process = this.connectResource({
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name: UNAUTHENTICATED_CHANNEL_NAME,
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path: '/v1/websocket/',
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resourceOptions: {
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name: UNAUTHENTICATED_CHANNEL_NAME,
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keepalive: { path: '/v1/keepalive' },
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transportOption,
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},
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});
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this.unauthenticated = process;
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let unauthenticated: IWebSocketResource;
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try {
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unauthenticated = await this.unauthenticated.getResult();
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} catch (error) {
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log.info(
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'SocketManager: failed to connect unauthenticated socket ' +
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` due to error: ${Errors.toLogFormat(error)}`
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);
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this.dropUnauthenticated(process);
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throw error;
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}
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log.info(
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`SocketManager: connected unauthenticated socket (localPort: ${unauthenticated.localPort()})`
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);
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unauthenticated.addEventListener('close', ({ code, reason }): void => {
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if (this.unauthenticated !== process) {
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return;
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}
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log.warn(
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'SocketManager: unauthenticated socket closed ' +
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`with code=${code} and reason=${reason}`
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);
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this.dropUnauthenticated(process);
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});
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|
|
return this.unauthenticated.getResult();
|
|
}
|
|
|
|
private connectResource({
|
|
name,
|
|
path,
|
|
resourceOptions,
|
|
query = {},
|
|
extraHeaders = {},
|
|
}: {
|
|
name: string;
|
|
path: string;
|
|
resourceOptions: WebSocketResourceOptions;
|
|
query?: Record<string, string>;
|
|
extraHeaders?: Record<string, string>;
|
|
}): AbortableProcess<IWebSocketResource> {
|
|
const queryWithDefaults = {
|
|
agent: 'OWD',
|
|
version: this.options.version,
|
|
...query,
|
|
};
|
|
|
|
const url = `${this.options.url}${path}?${qs.encode(queryWithDefaults)}`;
|
|
const { version } = this.options;
|
|
|
|
return connectWebSocket({
|
|
name,
|
|
url,
|
|
version,
|
|
certificateAuthority: this.options.certificateAuthority,
|
|
proxyAgent: this.proxyAgent,
|
|
|
|
extraHeaders,
|
|
|
|
createResource(socket: WebSocket): IWebSocketResource {
|
|
return !resourceOptions.transportOption ||
|
|
resourceOptions.transportOption === TransportOption.Original
|
|
? new WebSocketResource(socket, resourceOptions)
|
|
: new WebSocketResourceWithShadowing(
|
|
socket,
|
|
resourceOptions,
|
|
version
|
|
);
|
|
},
|
|
});
|
|
}
|
|
|
|
private static async checkResource(
|
|
process?: AbortableProcess<IWebSocketResource>
|
|
): Promise<void> {
|
|
if (!process) {
|
|
return;
|
|
}
|
|
|
|
const resource = await process.getResult();
|
|
resource.forceKeepAlive();
|
|
}
|
|
|
|
private dropAuthenticated(
|
|
process: AbortableProcess<IWebSocketResource>
|
|
): void {
|
|
if (this.authenticated !== process) {
|
|
return;
|
|
}
|
|
|
|
this.incomingRequestQueue = [];
|
|
this.authenticated = undefined;
|
|
this.setStatus(SocketStatus.CLOSED);
|
|
}
|
|
|
|
private dropUnauthenticated(
|
|
process: AbortableProcess<IWebSocketResource>
|
|
): void {
|
|
if (this.unauthenticated !== process) {
|
|
return;
|
|
}
|
|
|
|
this.unauthenticated = undefined;
|
|
if (!this.unauthenticatedExpirationTimer) {
|
|
return;
|
|
}
|
|
clearTimeout(this.unauthenticatedExpirationTimer);
|
|
this.unauthenticatedExpirationTimer = undefined;
|
|
}
|
|
|
|
private async startUnauthenticatedExpirationTimer(
|
|
expected: IWebSocketResource
|
|
): Promise<void> {
|
|
const process = this.unauthenticated;
|
|
strictAssert(
|
|
process !== undefined,
|
|
'Unauthenticated socket must be connected'
|
|
);
|
|
|
|
const unauthenticated = await process.getResult();
|
|
strictAssert(
|
|
unauthenticated === expected,
|
|
'Unauthenticated resource should be the same'
|
|
);
|
|
|
|
if (this.unauthenticatedExpirationTimer) {
|
|
return;
|
|
}
|
|
|
|
log.info(
|
|
'SocketManager: starting expiration timer for unauthenticated socket'
|
|
);
|
|
this.unauthenticatedExpirationTimer = setTimeout(async () => {
|
|
log.info(
|
|
'SocketManager: shutting down unauthenticated socket after timeout'
|
|
);
|
|
unauthenticated.shutdown();
|
|
|
|
// The socket is either deliberately closed or reconnected already
|
|
if (this.unauthenticated !== process) {
|
|
return;
|
|
}
|
|
|
|
this.dropUnauthenticated(process);
|
|
|
|
try {
|
|
await this.getUnauthenticatedResource();
|
|
} catch (error) {
|
|
log.warn(
|
|
'SocketManager: failed to reconnect unauthenticated socket ' +
|
|
`due to error: ${Errors.toLogFormat(error)}`
|
|
);
|
|
}
|
|
}, FIVE_MINUTES);
|
|
}
|
|
|
|
private queueOrHandleRequest(req: IncomingWebSocketRequest): void {
|
|
if (this.requestHandlers.size === 0) {
|
|
this.incomingRequestQueue.push(req);
|
|
log.info(
|
|
'SocketManager: request handler unavailable, ' +
|
|
`queued request. Queue size: ${this.incomingRequestQueue.length}`
|
|
);
|
|
return;
|
|
}
|
|
for (const handlers of this.requestHandlers) {
|
|
try {
|
|
handlers.handleRequest(req);
|
|
} catch (error) {
|
|
log.warn(
|
|
'SocketManager: got exception while handling incoming request, ' +
|
|
`error: ${Errors.toLogFormat(error)}`
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
private isAuthenticated(headers: Headers): boolean {
|
|
if (!this.credentials) {
|
|
return false;
|
|
}
|
|
|
|
const authorization = headers.get('Authorization');
|
|
if (!authorization) {
|
|
return false;
|
|
}
|
|
|
|
const [basic, base64] = authorization.split(/\s+/, 2);
|
|
|
|
if (basic.toLowerCase() !== 'basic' || !base64) {
|
|
return false;
|
|
}
|
|
|
|
const [username, password] = Bytes.toString(Bytes.fromBase64(base64)).split(
|
|
':',
|
|
2
|
|
);
|
|
|
|
return (
|
|
username === this.credentials.username &&
|
|
password === this.credentials.password
|
|
);
|
|
}
|
|
|
|
// EventEmitter types
|
|
|
|
public override on(
|
|
type: 'authError',
|
|
callback: (error: HTTPError) => void
|
|
): this;
|
|
public override on(type: 'statusChange', callback: () => void): this;
|
|
public override on(type: 'deviceConflict', callback: () => void): this;
|
|
public override on(type: 'connectError', callback: () => void): this;
|
|
|
|
public override on(
|
|
type: string | symbol,
|
|
// eslint-disable-next-line @typescript-eslint/no-explicit-any
|
|
listener: (...args: Array<any>) => void
|
|
): this {
|
|
return super.on(type, listener);
|
|
}
|
|
|
|
public override emit(type: 'authError', error: HTTPError): boolean;
|
|
public override emit(type: 'statusChange'): boolean;
|
|
public override emit(type: 'deviceConflict'): boolean;
|
|
public override emit(type: 'connectError'): boolean;
|
|
|
|
// eslint-disable-next-line @typescript-eslint/no-explicit-any
|
|
public override emit(type: string | symbol, ...args: Array<any>): boolean {
|
|
return super.emit(type, ...args);
|
|
}
|
|
}
|