mirror of
https://github.com/FranP-code/Baileys.git
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refactor: use modified legacy bin XML parser instead of "WABinary"
This commit is contained in:
Adhiraj Singh
260
src/WABinary/decode.ts
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260
src/WABinary/decode.ts
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@@ -0,0 +1,260 @@
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import { inflateSync } from 'zlib'
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import { DOUBLE_BYTE_TOKENS, SINGLE_BYTE_TOKENS, TAGS } from './constants'
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import { jidEncode } from './jid-utils'
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import type { BinaryNode } from './types'
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export const decompressingIfRequired = (buffer: Buffer) => {
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if(2 & buffer.readUInt8()) {
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buffer = inflateSync(buffer.slice(1))
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} else { // nodes with no compression have a 0x00 prefix, we remove that
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buffer = buffer.slice(1)
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}
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return buffer
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}
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export const decodeDecompressedBinaryNode = (buffer: Buffer, indexRef: { index: number } = { index: 0 }): BinaryNode => {
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const checkEOS = (length: number) => {
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if(indexRef.index + length > buffer.length) {
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throw new Error('end of stream')
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}
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}
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const next = () => {
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const value = buffer[indexRef.index]
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indexRef.index += 1
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return value
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}
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const readByte = () => {
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checkEOS(1)
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return next()
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}
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const readBytes = (n: number) => {
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checkEOS(n)
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const value = buffer.slice(indexRef.index, indexRef.index + n)
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indexRef.index += n
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return value
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}
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const readStringFromChars = (length: number) => {
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return readBytes(length).toString('utf-8')
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}
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const readInt = (n: number, littleEndian = false) => {
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checkEOS(n)
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let val = 0
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for(let i = 0; i < n; i++) {
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const shift = littleEndian ? i : n - 1 - i
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val |= next() << (shift * 8)
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}
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return val
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}
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const readInt20 = () => {
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checkEOS(3)
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return ((next() & 15) << 16) + (next() << 8) + next()
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}
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const unpackHex = (value: number) => {
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if(value >= 0 && value < 16) {
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return value < 10 ? '0'.charCodeAt(0) + value : 'A'.charCodeAt(0) + value - 10
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}
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throw new Error('invalid hex: ' + value)
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}
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const unpackNibble = (value: number) => {
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if(value >= 0 && value <= 9) {
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return '0'.charCodeAt(0) + value
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}
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switch (value) {
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case 10:
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return '-'.charCodeAt(0)
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case 11:
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return '.'.charCodeAt(0)
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case 15:
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return '\0'.charCodeAt(0)
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default:
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throw new Error('invalid nibble: ' + value)
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}
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}
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const unpackByte = (tag: number, value: number) => {
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if(tag === TAGS.NIBBLE_8) {
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return unpackNibble(value)
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} else if(tag === TAGS.HEX_8) {
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return unpackHex(value)
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} else {
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throw new Error('unknown tag: ' + tag)
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}
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}
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const readPacked8 = (tag: number) => {
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const startByte = readByte()
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let value = ''
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for(let i = 0; i < (startByte & 127); i++) {
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const curByte = readByte()
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value += String.fromCharCode(unpackByte(tag, (curByte & 0xf0) >> 4))
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value += String.fromCharCode(unpackByte(tag, curByte & 0x0f))
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}
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if(startByte >> 7 !== 0) {
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value = value.slice(0, -1)
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}
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return value
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}
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const isListTag = (tag: number) => {
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return tag === TAGS.LIST_EMPTY || tag === TAGS.LIST_8 || tag === TAGS.LIST_16
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}
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const readListSize = (tag: number) => {
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switch (tag) {
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case TAGS.LIST_EMPTY:
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return 0
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case TAGS.LIST_8:
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return readByte()
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case TAGS.LIST_16:
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return readInt(2)
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default:
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throw new Error('invalid tag for list size: ' + tag)
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}
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}
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const readJidPair = () => {
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const i = readString(readByte())
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const j = readString(readByte())
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if(j) {
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return (i || '') + '@' + j
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}
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throw new Error('invalid jid pair: ' + i + ', ' + j)
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}
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const readAdJid = () => {
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const agent = readByte()
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const device = readByte()
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const user = readString(readByte())
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return jidEncode(user, 's.whatsapp.net', device, agent)
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}
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const readString = (tag: number): string => {
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if(tag >= 1 && tag < SINGLE_BYTE_TOKENS.length) {
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return SINGLE_BYTE_TOKENS[tag]
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}
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switch (tag) {
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case TAGS.DICTIONARY_0:
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case TAGS.DICTIONARY_1:
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case TAGS.DICTIONARY_2:
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case TAGS.DICTIONARY_3:
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return getTokenDouble(tag - TAGS.DICTIONARY_0, readByte())
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case TAGS.LIST_EMPTY:
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return null
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case TAGS.BINARY_8:
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return readStringFromChars(readByte())
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case TAGS.BINARY_20:
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return readStringFromChars(readInt20())
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case TAGS.BINARY_32:
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return readStringFromChars(readInt(4))
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case TAGS.JID_PAIR:
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return readJidPair()
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case TAGS.AD_JID:
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return readAdJid()
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case TAGS.HEX_8:
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case TAGS.NIBBLE_8:
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return readPacked8(tag)
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default:
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throw new Error('invalid string with tag: ' + tag)
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}
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}
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const readList = (tag: number) => {
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const items: BinaryNode[] = []
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const size = readListSize(tag)
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for(let i = 0;i < size;i++) {
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items.push(decodeDecompressedBinaryNode(buffer, indexRef))
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}
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return items
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}
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const getTokenDouble = (index1: number, index2: number) => {
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const dict = DOUBLE_BYTE_TOKENS[index1]
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if(!dict) {
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throw new Error(`Invalid double token dict (${index1})`)
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}
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const value = dict[index2]
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if(typeof value === 'undefined') {
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throw new Error(`Invalid double token (${index2})`)
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}
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return value
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}
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const listSize = readListSize(readByte())
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const header = readString(readByte())
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if(!listSize || !header.length) {
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throw new Error('invalid node')
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}
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const attrs: BinaryNode['attrs'] = { }
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let data: BinaryNode['content']
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if(listSize === 0 || !header) {
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throw new Error('invalid node')
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}
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// read the attributes in
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const attributesLength = (listSize - 1) >> 1
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for(let i = 0; i < attributesLength; i++) {
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const key = readString(readByte())
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const value = readString(readByte())
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attrs[key] = value
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}
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if(listSize % 2 === 0) {
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const tag = readByte()
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if(isListTag(tag)) {
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data = readList(tag)
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} else {
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let decoded: Buffer | string
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switch (tag) {
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case TAGS.BINARY_8:
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decoded = readBytes(readByte())
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break
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case TAGS.BINARY_20:
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decoded = readBytes(readInt20())
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break
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case TAGS.BINARY_32:
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decoded = readBytes(readInt(4))
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break
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default:
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decoded = readString(tag)
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break
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}
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data = decoded
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}
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}
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return {
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tag: header,
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attrs,
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content: data
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}
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}
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export const decodeBinaryNode = (buff: Buffer): BinaryNode => {
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const decompBuff = decompressingIfRequired(buff)
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return decodeDecompressedBinaryNode(decompBuff)
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}
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