@bililive-tools/douyin-recorder
Version:
@bililive-tools douyin recorder implemention
109 lines (108 loc) • 4.42 kB
JavaScript
import fs from "node:fs";
import path from "node:path";
/**
* 接收 fn ，返回一个和 fn 签名一致的函数 fn'。当已经有一个 fn' 在运行时，再调用
* fn' 会直接返回运行中 fn' 的 Promise，直到 Promise 结束 pending 状态
*/
export function singleton(fn) {
let latestPromise = null;
return function (...args) {
if (latestPromise)
return latestPromise;
// @ts-ignore
const promise = fn.apply(this, args).finally(() => {
if (promise === latestPromise) {
latestPromise = null;
}
});
latestPromise = promise;
return promise;
};
}
export function ensureFolderExist(fileOrFolderPath) {
const folder = path.dirname(fileOrFolderPath);
if (!fs.existsSync(folder)) {
fs.mkdirSync(folder, { recursive: true });
}
}
export function assert(assertion, msg) {
if (!assertion) {
throw new Error(msg);
}
}
export function assertStringType(data, msg) {
assert(typeof data === "string", msg);
}
export function assertNumberType(data, msg) {
assert(typeof data === "number", msg);
}
export function assertObjectType(data, msg) {
assert(typeof data === "object", msg);
}
export function get__ac_signature(one_time_stamp, one_site, one_nonce, ua_n) {
function cal_one_str(one_str, orgi_iv) {
var k = orgi_iv;
for (var i = 0; i < one_str.length; i++) {
var a = one_str.charCodeAt(i);
k = ((k ^ a) * 65599) >>> 0;
}
return k;
}
function cal_one_str_3(one_str, orgi_iv) {
// 用于计算后两位
var k = orgi_iv;
for (var i = 0; i < one_str.length; i++) {
k = (k * 65599 + one_str.charCodeAt(i)) >>> 0;
}
return k;
}
function get_one_chr(enc_chr_code) {
if (enc_chr_code < 26) {
return String.fromCharCode(enc_chr_code + 65);
}
else if (enc_chr_code < 52) {
return String.fromCharCode(enc_chr_code + 71);
}
else if (enc_chr_code < 62) {
return String.fromCharCode(enc_chr_code - 4);
}
else {
return String.fromCharCode(enc_chr_code - 17);
}
}
function enc_num_to_str(one_orgi_enc) {
var s = "";
for (var i = 24; i >= 0; i -= 6) {
s += get_one_chr((one_orgi_enc >> i) & 63);
}
return s;
}
// var time_stamp = 1740635781
// var site = 'www.douyin.com/'; 提取自window.location.href
// var data_url = 'data:image/png;base64,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'
// var ua = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0";
// var nonce = '067bffadf00143f576ddf';
// var result = '_02B4Z6wo00f01HBw-fgAAIDA-rdLmXfuMxxwUP1AAHurb5'
var sign_head = "_02B4Z6wo00f01", time_stamp_s = one_time_stamp + "";
var a = cal_one_str(one_site, cal_one_str(time_stamp_s, 0)) % 65521;
var b = parseInt("10000000110000" +
// @ts-ignore
parseInt((one_time_stamp ^ (a * 65521)) >>> 0)
.toString(2)
.padStart(32, "0"), 2), b_s = b + "";
var c = cal_one_str(b_s, 0);
var d = enc_num_to_str(b >> 2);
var e = (b / 4294967296) >>> 0;
var f = enc_num_to_str((b << 28) | (e >>> 4));
var g = 582085784 ^ b;
var h = enc_num_to_str((e << 26) | (g >>> 6));
var i = get_one_chr(g & 63);
var j = (cal_one_str(ua_n, c) % 65521 << 16) | cal_one_str(one_nonce, c) % 65521;
var k = enc_num_to_str(j >> 2);
var l = enc_num_to_str((j << 28) | ((524576 ^ b) >>> 4));
var m = enc_num_to_str(a);
var n = sign_head + d + f + h + i + k + l + m;
var o = parseInt(cal_one_str_3(n, 0)).toString(16).slice(-2);
var signature = n + o;
return signature;
}