feat: functional legacy socket

This commit is contained in:
Adhiraj Singh
2021-12-17 20:58:33 +05:30
parent d8b415a075
commit c803e22e8a
15 changed files with 695 additions and 66 deletions

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@@ -0,0 +1,198 @@
export const Tags = {
LIST_EMPTY: 0,
STREAM_END: 2,
DICTIONARY_0: 236,
DICTIONARY_1: 237,
DICTIONARY_2: 238,
DICTIONARY_3: 239,
LIST_8: 248,
LIST_16: 249,
JID_PAIR: 250,
HEX_8: 251,
BINARY_8: 252,
BINARY_20: 253,
BINARY_32: 254,
NIBBLE_8: 255,
SINGLE_BYTE_MAX: 256,
PACKED_MAX: 254,
}
export const DoubleByteTokens = []
export const SingleByteTokens = [
null,
null,
null,
'200',
'400',
'404',
'500',
'501',
'502',
'action',
'add',
'after',
'archive',
'author',
'available',
'battery',
'before',
'body',
'broadcast',
'chat',
'clear',
'code',
'composing',
'contacts',
'count',
'create',
'debug',
'delete',
'demote',
'duplicate',
'encoding',
'error',
'false',
'filehash',
'from',
'g.us',
'group',
'groups_v2',
'height',
'id',
'image',
'in',
'index',
'invis',
'item',
'jid',
'kind',
'last',
'leave',
'live',
'log',
'media',
'message',
'mimetype',
'missing',
'modify',
'name',
'notification',
'notify',
'out',
'owner',
'participant',
'paused',
'picture',
'played',
'presence',
'preview',
'promote',
'query',
'raw',
'read',
'receipt',
'received',
'recipient',
'recording',
'relay',
'remove',
'response',
'resume',
'retry',
's.whatsapp.net',
'seconds',
'set',
'size',
'status',
'subject',
'subscribe',
't',
'text',
'to',
'true',
'type',
'unarchive',
'unavailable',
'url',
'user',
'value',
'web',
'width',
'mute',
'read_only',
'admin',
'creator',
'short',
'update',
'powersave',
'checksum',
'epoch',
'block',
'previous',
'409',
'replaced',
'reason',
'spam',
'modify_tag',
'message_info',
'delivery',
'emoji',
'title',
'description',
'canonical-url',
'matched-text',
'star',
'unstar',
'media_key',
'filename',
'identity',
'unread',
'page',
'page_count',
'search',
'media_message',
'security',
'call_log',
'profile',
'ciphertext',
'invite',
'gif',
'vcard',
'frequent',
'privacy',
'blacklist',
'whitelist',
'verify',
'location',
'document',
'elapsed',
'revoke_invite',
'expiration',
'unsubscribe',
'disable',
'vname',
'old_jid',
'new_jid',
'announcement',
'locked',
'prop',
'label',
'color',
'call',
'offer',
'call-id',
'quick_reply',
'sticker',
'pay_t',
'accept',
'reject',
'sticker_pack',
'invalid',
'canceled',
'missed',
'connected',
'result',
'audio',
'video',
'recent',
]

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@@ -0,0 +1,337 @@
import { BinaryNode } from '../types'
import { DoubleByteTokens, SingleByteTokens, Tags } from './constants'
export const isLegacyBinaryNode = (buffer: Buffer) => {
switch(buffer[0]) {
case Tags.LIST_EMPTY:
case Tags.LIST_8:
case Tags.LIST_16:
return true
default:
return false
}
}
function decode(buffer: Buffer, indexRef: { index: number }): BinaryNode {
const checkEOS = (length: number) => {
if (indexRef.index + length > buffer.length) {
throw new Error('end of stream')
}
}
const next = () => {
const value = buffer[indexRef.index]
indexRef.index += 1
return value
}
const readByte = () => {
checkEOS(1)
return next()
}
const readStringFromChars = (length: number) => {
checkEOS(length)
const value = buffer.slice(indexRef.index, indexRef.index + length)
indexRef.index += length
return value.toString('utf-8')
}
const readBytes = (n: number) => {
checkEOS(n)
const value = buffer.slice(indexRef.index, indexRef.index + n)
indexRef.index += n
return value
}
const readInt = (n: number, littleEndian = false) => {
checkEOS(n)
let val = 0
for (let i = 0; i < n; i++) {
const shift = littleEndian ? i : n - 1 - i
val |= next() << (shift * 8)
}
return val
}
const readInt20 = () => {
checkEOS(3)
return ((next() & 15) << 16) + (next() << 8) + next()
}
const unpackHex = (value: number) => {
if (value >= 0 && value < 16) {
return value < 10 ? '0'.charCodeAt(0) + value : 'A'.charCodeAt(0) + value - 10
}
throw new Error('invalid hex: ' + value)
}
const unpackNibble = (value: number) => {
if (value >= 0 && value <= 9) {
return '0'.charCodeAt(0) + value
}
switch (value) {
case 10:
return '-'.charCodeAt(0)
case 11:
return '.'.charCodeAt(0)
case 15:
return '\0'.charCodeAt(0)
default:
throw new Error('invalid nibble: ' + value)
}
}
const unpackByte = (tag: number, value: number) => {
if (tag === Tags.NIBBLE_8) {
return unpackNibble(value)
} else if (tag === Tags.HEX_8) {
return unpackHex(value)
} else {
throw new Error('unknown tag: ' + tag)
}
}
const readPacked8 = (tag: number) => {
const startByte = readByte()
let value = ''
for (let i = 0; i < (startByte & 127); i++) {
const curByte = readByte()
value += String.fromCharCode(unpackByte(tag, (curByte & 0xf0) >> 4))
value += String.fromCharCode(unpackByte(tag, curByte & 0x0f))
}
if (startByte >> 7 !== 0) {
value = value.slice(0, -1)
}
return value
}
const isListTag = (tag: number) => {
return tag === Tags.LIST_EMPTY || tag === Tags.LIST_8 || tag === Tags.LIST_16
}
const readListSize = (tag: number) => {
switch (tag) {
case Tags.LIST_EMPTY:
return 0
case Tags.LIST_8:
return readByte()
case Tags.LIST_16:
return readInt(2)
default:
throw new Error('invalid tag for list size: ' + tag)
}
}
const getToken = (index: number) => {
if (index < 3 || index >= SingleByteTokens.length) {
throw new Error('invalid token index: ' + index)
}
return SingleByteTokens[index]
}
const readString = (tag: number) => {
if (tag >= 3 && tag <= 235) {
const token = getToken(tag)
return token// === 's.whatsapp.net' ? 'c.us' : token
}
switch (tag) {
case Tags.DICTIONARY_0:
case Tags.DICTIONARY_1:
case Tags.DICTIONARY_2:
case Tags.DICTIONARY_3:
return getTokenDouble(tag - Tags.DICTIONARY_0, readByte())
case Tags.LIST_EMPTY:
return null
case Tags.BINARY_8:
return readStringFromChars(readByte())
case Tags.BINARY_20:
return readStringFromChars(readInt20())
case Tags.BINARY_32:
return readStringFromChars(readInt(4))
case Tags.JID_PAIR:
const i = readString(readByte())
const j = readString(readByte())
if (typeof i === 'string' && j) {
return i + '@' + j
}
throw new Error('invalid jid pair: ' + i + ', ' + j)
case Tags.HEX_8:
case Tags.NIBBLE_8:
return readPacked8(tag)
default:
throw new Error('invalid string with tag: ' + tag)
}
}
const readList = (tag: number) => (
[...new Array(readListSize(tag))].map(() => decode(buffer, indexRef))
)
const getTokenDouble = (index1: number, index2: number) => {
const n = 256 * index1 + index2
if (n < 0 || n > DoubleByteTokens.length) {
throw new Error('invalid double token index: ' + n)
}
return DoubleByteTokens[n]
}
const listSize = readListSize(readByte())
const descrTag = readByte()
if (descrTag === Tags.STREAM_END) {
throw new Error('unexpected stream end')
}
const header = readString(descrTag)
const attrs: BinaryNode['attrs'] = { }
let data: BinaryNode['content']
if (listSize === 0 || !header) {
throw new Error('invalid node')
}
// read the attributes in
const attributesLength = (listSize - 1) >> 1
for (let i = 0; i < attributesLength; i++) {
const key = readString(readByte())
const b = readByte()
attrs[key] = readString(b)
}
if (listSize % 2 === 0) {
const tag = readByte()
if (isListTag(tag)) {
data = readList(tag)
} else {
let decoded: Buffer | string
switch (tag) {
case Tags.BINARY_8:
decoded = readBytes(readByte())
break
case Tags.BINARY_20:
decoded = readBytes(readInt20())
break
case Tags.BINARY_32:
decoded = readBytes(readInt(4))
break
default:
decoded = readString(tag)
break
}
data = decoded
}
}
return {
tag: header,
attrs,
content: data
}
}
const encode = ({ tag, attrs, content }: BinaryNode, buffer: number[] = []) => {
const pushByte = (value: number) => buffer.push(value & 0xff)
const pushInt = (value: number, n: number, littleEndian=false) => {
for (let i = 0; i < n; i++) {
const curShift = littleEndian ? i : n - 1 - i
buffer.push((value >> (curShift * 8)) & 0xff)
}
}
const pushBytes = (bytes: Uint8Array | Buffer | number[]) => (
bytes.forEach (b => buffer.push(b))
)
const pushInt20 = (value: number) => (
pushBytes([(value >> 16) & 0x0f, (value >> 8) & 0xff, value & 0xff])
)
const writeByteLength = (length: number) => {
if (length >= 4294967296) throw new Error('string too large to encode: ' + length)
if (length >= 1 << 20) {
pushByte(Tags.BINARY_32)
pushInt(length, 4) // 32 bit integer
} else if (length >= 256) {
pushByte(Tags.BINARY_20)
pushInt20(length)
} else {
pushByte(Tags.BINARY_8)
pushByte(length)
}
}
const writeStringRaw = (str: string) => {
const bytes = Buffer.from (str, 'utf-8')
writeByteLength(bytes.length)
pushBytes(bytes)
}
const writeToken = (token: number) => {
if (token < 245) {
pushByte(token)
} else if (token <= 500) {
throw new Error('invalid token')
}
}
const writeString = (token: string, i?: boolean) => {
if (token === 'c.us') token = 's.whatsapp.net'
const tokenIndex = SingleByteTokens.indexOf(token)
if (!i && token === 's.whatsapp.net') {
writeToken(tokenIndex)
} else if (tokenIndex >= 0) {
if (tokenIndex < Tags.SINGLE_BYTE_MAX) {
writeToken(tokenIndex)
} else {
const overflow = tokenIndex - Tags.SINGLE_BYTE_MAX
const dictionaryIndex = overflow >> 8
if (dictionaryIndex < 0 || dictionaryIndex > 3) {
throw new Error('double byte dict token out of range: ' + token + ', ' + tokenIndex)
}
writeToken(Tags.DICTIONARY_0 + dictionaryIndex)
writeToken(overflow % 256)
}
} else if (token) {
const jidSepIndex = token.indexOf('@')
if (jidSepIndex <= 0) {
writeStringRaw(token)
} else {
writeJid(token.slice(0, jidSepIndex), token.slice(jidSepIndex + 1, token.length))
}
}
}
const writeJid = (left: string, right: string) => {
pushByte(Tags.JID_PAIR)
left && left.length > 0 ? writeString(left) : writeToken(Tags.LIST_EMPTY)
writeString(right)
}
const writeListStart = (listSize: number) => {
if (listSize === 0) {
pushByte(Tags.LIST_EMPTY)
} else if (listSize < 256) {
pushBytes([Tags.LIST_8, listSize])
} else {
pushBytes([Tags.LIST_16, listSize])
}
}
const validAttributes = Object.keys(attrs).filter(k => (
typeof attrs[k] !== 'undefined' && attrs[k] !== null
))
writeListStart(2*validAttributes.length + 1 + (typeof content !== 'undefined' && content !== null ? 1 : 0))
writeString(tag)
validAttributes.forEach((key) => {
if(typeof attrs[key] === 'string') {
writeString(key)
writeString(attrs[key])
}
})
if (typeof content === 'string') {
writeString(content, true)
} else if (Buffer.isBuffer(content)) {
writeByteLength(content.length)
pushBytes(content)
} else if (Array.isArray(content)) {
writeListStart(content.length)
for(const item of content) {
if(item) encode(item, buffer)
}
} else if(typeof content === 'undefined' || content === null) {
} else {
throw new Error(`invalid children for header "${tag}": ${content} (${typeof content})`)
}
return Buffer.from(buffer)
}
export const encodeBinaryNodeLegacy = encode
export const decodeBinaryNodeLegacy = decode

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@@ -3,6 +3,7 @@ import { jidDecode, jidEncode } from './jid-utils';
import { Binary, numUtf8Bytes } from '../../WABinary/Binary';
import { Boom } from '@hapi/boom';
import { proto } from '../../WAProto';
import { BinaryNode } from './types';
const LIST1 = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '.', '<27>', '<27>', '<27>', '<27>'];
const LIST2 = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
@@ -210,20 +211,6 @@ function bufferToUInt(e: Uint8Array | Buffer, t: number) {
for (let i = 0; i < t; i++) a = 256 * a + e[i]
return a
}
/**
* the binary node WA uses internally for communication
*
* this is manipulated soley as an object and it does not have any functions.
* This is done for easy serialization, to prevent running into issues with prototypes &
* to maintain functional code structure
* */
export type BinaryNode = {
tag: string
attrs: { [key: string]: string }
content?: BinaryNode[] | string | Uint8Array
}
export type BinaryNodeAttributes = BinaryNode['attrs']
export type BinaryNodeData = BinaryNode['content']
export const decodeBinaryNode = (data: Binary): BinaryNode => {
//U
@@ -333,4 +320,6 @@ export const getBinaryNodeMessages = ({ content }: BinaryNode) => {
}
export * from './jid-utils'
export { Binary } from '../../WABinary/Binary'
export { Binary } from '../../WABinary/Binary'
export * from './types'
export * from './Legacy'

14
src/WABinary/types.ts Normal file
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@@ -0,0 +1,14 @@
/**
* the binary node WA uses internally for communication
*
* this is manipulated soley as an object and it does not have any functions.
* This is done for easy serialization, to prevent running into issues with prototypes &
* to maintain functional code structure
* */
export type BinaryNode = {
tag: string
attrs: { [key: string]: string }
content?: BinaryNode[] | string | Uint8Array
}
export type BinaryNodeAttributes = BinaryNode['attrs']
export type BinaryNodeData = BinaryNode['content']