Skip to content

feat: rotate user-agent across 5 stealth profiles #11

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
askalf wants to merge 1 commit into
base: master
Choose a base branch
from
Open

feat: rotate user-agent across 5 stealth profiles #11

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
41 changes: 41 additions & 0 deletions launch.mjs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,51 @@
* /usr/bin/chromium (Debian).
* HTTPS_PROXY / HTTP_PROXY — passed as --proxy-server when set.
* Used for VPN-fronted scraping.
* BROWSER_SESSION_ID — optional caller-supplied session ID.
* Same ID -> same UA; different IDs
* spread across the UA pool. Falls back
* to a per-process seed when unset.
*/

import { spawn } from 'node:child_process';
import { createHash } from 'node:crypto';
import puppeteer from 'puppeteer-extra';
import StealthPlugin from 'puppeteer-extra-plugin-stealth';

// Rotating UA pool — latest Chrome stable across the major desktop
// and mobile platforms. Picked deterministically per session so a
// given session keeps a stable fingerprint across reconnects, while
// different sessions spread across the pool to avoid one UA dominating
// a target's logs. Bump the Chrome major as new stable ships.
const UA_POOL = [
// Windows 10
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36',
// macOS
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36',
// Linux
'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36',
// Android (Pixel 8)
'Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Mobile Safari/537.36',
// iOS (Chrome on iPhone reports as CriOS)
'Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/132.0.0.0 Mobile/15E148 Safari/604.1',
];

// Per-process fallback seed — hashed once so we don't recompute on
// every pickUa() call. Used when no explicit session ID is supplied.
const FALLBACK_SEED = `${process.pid}:${Date.now()}`;

function pickUa(sessionId) {
const seed = sessionId && sessionId.length > 0 ? sessionId : FALLBACK_SEED;
const digest = createHash('sha256').update(seed).digest();
// Read a 32-bit slice — plenty of entropy for a 5-item pool and
// keeps the modulo bias far below anything observable.
const idx = digest.readUInt32BE(0) % UA_POOL.length;
return UA_POOL[idx];
}

const SESSION_ID = process.env.BROWSER_SESSION_ID ?? '';
const USER_AGENT = pickUa(SESSION_ID);

const stealth = StealthPlugin();
// Enable every evasion the plugin ships with. The default set is partial
// to avoid surprising users; for an automation bridge we want them all.
Expand Down Expand Up @@ -83,6 +122,7 @@ const args = [
'--enable-webgl',
'--enable-accelerated-2d-canvas',
'--font-render-hinting=medium',
`--user-agent=${USER_AGENT}`,
];

const proxy = process.env.HTTPS_PROXY ?? process.env.HTTP_PROXY;
Expand All @@ -92,6 +132,7 @@ if (proxy) {
}

console.log('[browser-bridge] launching stealth Chromium...');
console.log(`[browser-bridge] UA: ${USER_AGENT}`);

let browser;
try {
Expand Down