mirror of
https://github.com/FranP-code/Baileys.git
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189 lines
8.9 KiB
TypeScript
189 lines
8.9 KiB
TypeScript
import * as Curve from 'curve25519-js'
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import * as Utils from './Utils'
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import {WAConnection as Base} from './0.Base'
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import { MessageLogLevel, WAMetric, WAFlag, BaileysError, Presence } from './Constants'
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export class WAConnection extends Base {
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/** Authenticate the connection */
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protected async authenticate (reconnect?: string) {
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// if no auth info is present, that is, a new session has to be established
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// generate a client ID
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if (!this.authInfo?.clientID) {
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this.authInfo = { clientID: Utils.generateClientID() } as any
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}
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this.referenceDate = new Date () // refresh reference date
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const json = ['admin', 'init', this.version, this.browserDescription, this.authInfo?.clientID, true]
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return this.query({json, expect200: true, waitForOpen: false})
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.then(json => {
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// we're trying to establish a new connection or are trying to log in
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if (this.authInfo?.encKey && this.authInfo?.macKey) {
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// if we have the info to restore a closed session
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const json = [
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'admin',
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'login',
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this.authInfo?.clientToken,
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this.authInfo?.serverToken,
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this.authInfo?.clientID,
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]
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if (reconnect) json.push(...['reconnect', reconnect.replace('@s.whatsapp.net', '@c.us')])
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else json.push ('takeover')
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return this.query({ json, tag: 's1', waitForOpen: false }) // wait for response with tag "s1"
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}
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return this.generateKeysForAuth(json.ref) // generate keys which will in turn be the QR
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})
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.then(async json => {
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if ('status' in json) {
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switch (json.status) {
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case 401: // if the phone was unpaired
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throw new BaileysError ('unpaired from phone', json)
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case 429: // request to login was denied, don't know why it happens
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throw new BaileysError ('request denied', json)
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default:
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throw new BaileysError ('unexpected status ' + json.status, json)
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}
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}
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// if its a challenge request (we get it when logging in)
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if (json[1]?.challenge) {
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await this.respondToChallenge(json[1].challenge)
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return this.waitForMessage('s2', [])
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}
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// otherwise just chain the promise further
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return json
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})
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.then(async json => {
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this.validateNewConnection(json[1]) // validate the connection
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this.log('validated connection successfully', MessageLogLevel.info)
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this.sendPostConnectQueries ()
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this.lastSeen = new Date() // set last seen to right now
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})
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}
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/**
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* Send the same queries WA Web sends after connect
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*/
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sendPostConnectQueries () {
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this.sendBinary (['query', {type: 'contacts', epoch: '1'}, null], [ WAMetric.queryContact, WAFlag.ignore ])
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this.sendBinary (['query', {type: 'chat', epoch: '1'}, null], [ WAMetric.queryChat, WAFlag.ignore ])
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this.sendBinary (['query', {type: 'status', epoch: '1'}, null], [ WAMetric.queryStatus, WAFlag.ignore ])
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this.sendBinary (['query', {type: 'quick_reply', epoch: '1'}, null], [ WAMetric.queryQuickReply, WAFlag.ignore ])
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this.sendBinary (['query', {type: 'label', epoch: '1'}, null], [ WAMetric.queryLabel, WAFlag.ignore ])
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this.sendBinary (['query', {type: 'emoji', epoch: '1'}, null], [ WAMetric.queryEmoji, WAFlag.ignore ])
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this.sendBinary (['action', {type: 'set', epoch: '1'}, [['presence', {type: Presence.available}, null]] ], [ WAMetric.presence, 160 ])
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}
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/**
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* Refresh QR Code
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* @returns the new ref
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*/
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async generateNewQRCodeRef() {
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const response = await this.query({json: ['admin', 'Conn', 'reref'], expect200: true, waitForOpen: false})
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return response.ref as string
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}
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/**
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* Once the QR code is scanned and we can validate our connection, or we resolved the challenge when logging back in
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* @private
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* @param {object} json
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*/
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private validateNewConnection(json) {
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const onValidationSuccess = () => {
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// set metadata: one's WhatsApp ID [cc][number]@s.whatsapp.net, name on WhatsApp, info about the phone
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this.user = {
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id: Utils.whatsappID(json.wid),
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name: json.pushname,
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phone: json.phone,
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imgUrl: null
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}
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return this.user
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}
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if (!json.secret) {
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// if we didn't get a secret, we don't need it, we're validated
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return onValidationSuccess()
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}
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const secret = Buffer.from(json.secret, 'base64')
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if (secret.length !== 144) {
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throw new Error ('incorrect secret length received: ' + secret.length)
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}
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// generate shared key from our private key & the secret shared by the server
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const sharedKey = Curve.sharedKey(this.curveKeys.private, secret.slice(0, 32))
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// expand the key to 80 bytes using HKDF
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const expandedKey = Utils.hkdf(sharedKey as Buffer, 80)
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// perform HMAC validation.
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const hmacValidationKey = expandedKey.slice(32, 64)
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const hmacValidationMessage = Buffer.concat([secret.slice(0, 32), secret.slice(64, secret.length)])
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const hmac = Utils.hmacSign(hmacValidationMessage, hmacValidationKey)
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if (hmac.equals(secret.slice(32, 64))) {
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// computed HMAC should equal secret[32:64]
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// expandedKey[64:] + secret[64:] are the keys, encrypted using AES, that are used to encrypt/decrypt the messages recieved from WhatsApp
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// they are encrypted using key: expandedKey[0:32]
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const encryptedAESKeys = Buffer.concat([
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expandedKey.slice(64, expandedKey.length),
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secret.slice(64, secret.length),
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])
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const decryptedKeys = Utils.aesDecrypt(encryptedAESKeys, expandedKey.slice(0, 32))
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// set the credentials
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this.authInfo = {
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encKey: decryptedKeys.slice(0, 32), // first 32 bytes form the key to encrypt/decrypt messages
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macKey: decryptedKeys.slice(32, 64), // last 32 bytes from the key to sign messages
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clientToken: json.clientToken,
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serverToken: json.serverToken,
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clientID: this.authInfo.clientID,
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}
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return onValidationSuccess()
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} else {
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// if the checksums didn't match
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throw new BaileysError ('HMAC validation failed', json)
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}
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}
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/**
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* When logging back in (restoring a previously closed session), WhatsApp may challenge one to check if one still has the encryption keys
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* WhatsApp does that by asking for us to sign a string it sends with our macKey
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*/
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protected respondToChallenge(challenge: string) {
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const bytes = Buffer.from(challenge, 'base64') // decode the base64 encoded challenge string
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const signed = Utils.hmacSign(bytes, this.authInfo.macKey).toString('base64') // sign the challenge string with our macKey
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const json = ['admin', 'challenge', signed, this.authInfo.serverToken, this.authInfo.clientID] // prepare to send this signed string with the serverToken & clientID
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this.log('resolving login challenge', MessageLogLevel.info)
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return this.query({json, expect200: true, waitForOpen: false})
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}
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/** When starting a new session, generate a QR code by generating a private/public key pair & the keys the server sends */
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protected async generateKeysForAuth(ref: string) {
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this.curveKeys = Curve.generateKeyPair(Utils.randomBytes(32))
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const publicKey = Buffer.from(this.curveKeys.public).toString('base64')
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const emitQR = () => {
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const qr = [ref, publicKey, this.authInfo.clientID].join(',')
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this.emit ('qr', qr)
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}
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const regenQR = () => {
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this.qrTimeout = setTimeout (() => {
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if (this.state === 'open') return
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this.log ('regenerated QR', MessageLogLevel.info)
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this.generateNewQRCodeRef ()
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.then (newRef => ref = newRef)
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.then (emitQR)
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.then (regenQR)
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.catch (err => this.log (`error in QR gen: ${err}`, MessageLogLevel.info))
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}, this.regenerateQRIntervalMs)
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}
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emitQR ()
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if (this.regenerateQRIntervalMs) regenQR ()
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const json = await this.waitForMessage('s1', [])
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this.qrTimeout && clearTimeout (this.qrTimeout)
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this.qrTimeout = null
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return json
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}
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}
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