@baileys-md/baileys
Version:
Baileys WhatsApp API
219 lines (215 loc) • 6.32 kB
JavaScript
//========================================//
import * as constants from "./constants.js";
import { jidDecode } from "./jid-utils.js";
export const encodeBinaryNode = (node, opts = constants, buffer = [0]) => {
const encoded = encodeBinaryNodeInner(node, opts, buffer);
return Buffer.from(encoded);
};
const encodeBinaryNodeInner = ({ tag, attrs, content }, opts, buffer) => {
const { TAGS, TOKEN_MAP } = opts;
const pushByte = (value) => buffer.push(value & 0xff);
const pushInt = (value, n, 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) => {
for (const b of bytes) {
buffer.push(b);
}
};
const pushInt16 = (value) => {
pushBytes([(value >> 8) & 0xff, value & 0xff]);
};
const pushInt20 = (value) => pushBytes([(value >> 16) & 0x0f, (value >> 8) & 0xff, value & 0xff]);
const writeByteLength = (length) => {
if (length >= 4294967296) {
throw new Error("string muito grande para codificar: " + length);
}
if (length >= 1 << 20) {
pushByte(TAGS.BINARY_32);
pushInt(length, 4);
}
else if (length >= 256) {
pushByte(TAGS.BINARY_20);
pushInt20(length);
}
else {
pushByte(TAGS.BINARY_8);
pushByte(length);
}
};
const writeStringRaw = (str) => {
const bytes = Buffer.from(str, "utf-8");
writeByteLength(bytes.length);
pushBytes(bytes);
};
const writeJid = ({ domainType, device, user, server }) => {
if (typeof device !== "undefined") {
pushByte(TAGS.AD_JID);
pushByte(domainType || 0);
pushByte(device || 0);
writeString(user);
}
else {
pushByte(TAGS.JID_PAIR);
if (user.length) {
writeString(user);
}
else {
pushByte(TAGS.LIST_EMPTY);
}
writeString(server);
}
};
const packNibble = (char) => {
switch (char) {
case "-":
return 10;
case ".":
return 11;
case "\0":
return 15;
default:
if (char >= "0" && char <= "9") {
return char.charCodeAt(0) - "0".charCodeAt(0);
}
throw new Error(`byte inválido para mordidela "${char}"`);
}
};
const packHex = (char) => {
if (char >= "0" && char <= "9") {
return char.charCodeAt(0) - "0".charCodeAt(0);
}
if (char >= "A" && char <= "F") {
return 10 + char.charCodeAt(0) - "A".charCodeAt(0);
}
if (char >= "a" && char <= "f") {
return 10 + char.charCodeAt(0) - "a".charCodeAt(0);
}
if (char === "\0") {
return 15;
}
throw new Error(`Caractere hexadecimal inválido "${char}"`);
};
const writePackedBytes = (str, type) => {
if (str.length > TAGS.PACKED_MAX) {
throw new Error("Muitos bytes para empacotar");
}
pushByte(type === "nibble" ? TAGS.NIBBLE_8 : TAGS.HEX_8);
let roundedLength = Math.ceil(str.length / 2.0);
if (str.length % 2 !== 0) {
roundedLength |= 128;
}
pushByte(roundedLength);
const packFunction = type === "nibble" ? packNibble : packHex;
const packBytePair = (v1, v2) => {
const result = (packFunction(v1) << 4) | packFunction(v2);
return result;
};
const strLengthHalf = Math.floor(str.length / 2);
for (let i = 0; i < strLengthHalf; i++) {
pushByte(packBytePair(str[2 * i], str[2 * i + 1]));
}
if (str.length % 2 !== 0) {
pushByte(packBytePair(str[str.length - 1], "\x00"));
}
};
const isNibble = (str) => {
if (!str || str.length > TAGS.PACKED_MAX) {
return false;
}
for (const char of str) {
const isInNibbleRange = char >= "0" && char <= "9";
if (!isInNibbleRange && char !== "-" && char !== ".") {
return false;
}
}
return true;
};
const isHex = (str) => {
if (!str || str.length > TAGS.PACKED_MAX) {
return false;
}
for (const char of str) {
const isInNibbleRange = char >= "0" && char <= "9";
if (!isInNibbleRange && !(char >= "A" && char <= "F")) {
return false;
}
}
return true;
};
const writeString = (str) => {
if (str === undefined || str === null) {
pushByte(TAGS.LIST_EMPTY);
return;
}
const tokenIndex = TOKEN_MAP[str];
if (tokenIndex) {
if (typeof tokenIndex.dict === "number") {
pushByte(TAGS.DICTIONARY_0 + tokenIndex.dict);
}
pushByte(tokenIndex.index);
}
else if (isNibble(str)) {
writePackedBytes(str, "nibble");
}
else if (isHex(str)) {
writePackedBytes(str, "hex");
}
else if (str) {
const decodedJid = jidDecode(str);
if (decodedJid) {
writeJid(decodedJid);
}
else {
writeStringRaw(str);
}
}
};
const writeListStart = (listSize) => {
if (listSize === 0) {
pushByte(TAGS.LIST_EMPTY);
}
else if (listSize < 256) {
pushBytes([TAGS.LIST_8, listSize]);
}
else {
pushByte(TAGS.LIST_16);
pushInt16(listSize);
}
};
if (!tag) {
throw new Error("Nó inválido: a tag não pode ser indefinida");
}
const validAttributes = Object.keys(attrs || {}).filter(k => typeof attrs[k] !== "undefined" && attrs[k] !== null);
writeListStart(2 * validAttributes.length + 1 + (typeof content !== "undefined" ? 1 : 0));
writeString(tag);
for (const key of validAttributes) {
if (typeof attrs[key] === "string") {
writeString(key);
writeString(attrs[key]);
}
}
if (typeof content === "string") {
writeString(content);
}
else if (Buffer.isBuffer(content) || content instanceof Uint8Array) {
writeByteLength(content.length);
pushBytes(content);
}
else if (Array.isArray(content)) {
const validContent = content.filter(item => item && (item.tag || Buffer.isBuffer(item) || item instanceof Uint8Array || typeof item === "string"));
writeListStart(validContent.length);
for (const item of validContent) {
encodeBinaryNodeInner(item, opts, buffer);
}
}
else if (typeof content === "undefined") {
}
else {
throw new Error(`filhos inválidos para cabeçalho "${tag}": ${content} (${typeof content})`);
}
return buffer;
};