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// A site's login lnurl (LNURL-auth) pasted into Send is a login, not a
// payment: the wallet asks first, naming the site, then signs the challenge
// and tells the site; the site's refusal is shown as its own words. Against
// a stand-in login server that checks the signature the way a real one does.
// Run: bun tools/lnurl-auth-test.js
import
generated by cgit v1.2.3 (git 2.51.0) at 2026-11-09 07:30:59 +0000
span> generateMnemonic } from '@scure/bip39'; import { wordlist } from '@scure/bip39/wordlists/english'; import { secp256k1 } from '@noble/curves/secp256k1'; import { hexToBytes } from '@noble/hashes/utils'; import { encodeLnurl } from '../src/lnurl.js'; import { buildHtml } from '../build.js'; const sleep = (ms) => new Promise((r) => setTimeout(r, ms)); let ok = true; const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; }; const html = await buildHtml({ minify: true, pwa: false }); const logins = []; // what the stand-in site was told const server = Bun.serve({ port: 0, fetch: (req) => { const u = new URL(req.url), p = u.pathname; if (p === '/lnauth') { const sig = u.searchParams.get('sig'), key = u.searchParams.get('key'), k1 = u.searchParams.get('k1'); if (!sig) return Response.json({ status: 'ERROR', reason: 'no sig query variable provided' }); let good = false; try { good = secp256k1.verify(secp256k1.Signature.fromDER(sig), hexToBytes(k1), hexToBytes(key)); } catch {} logins.push({ k1, key, good }); return Response.json(good ? { status: 'OK' } : { status: 'ERROR', reason: 'bad signature' }); } if (p === '/lnauth-closed') return Response.json({ status: 'ERROR', reason: 'registrations are closed' }); if (p.startsWith('/punks') || p === '/verify-worker.js' || p.startsWith('/locales') || /\.js$/.test(p)) { const f = Bun.file('dist' + p); return f.size ? new Response(f) : new Response('', { status: 404 }); } return new Response(html, { headers: { 'content-type': 'text/html' } }); } }); const k1 = 'c0ffee'.repeat(10) + 'abcd'; const loginLnurl = encodeLnurl(server.url.origin + '/lnauth?tag=login&k1=' + k1 + '&action=login'); const closedLnurl = encodeLnurl(server.url.origin + '/lnauth-closed?tag=login&k1=' + k1 + '&action=register'); const browser = await puppeteer.launch({ executablePath: process.env.CHROME || '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox'] }); const ctx = browser.defaultBrowserContext(); await ctx.overridePermissions(server.url.origin, ['clipboard-read', 'clipboard-write', 'clipboard-sanitized-write']); const page = await browser.newPage(); const errs = []; page.on('pageerror', (e) => errs.push(String(e))); const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase() === x || n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t); const text = () => page.evaluate(() => document.body.innerText); const waitText = async (x, ms = 8000) => { for (let i = 0; i < ms / 200; i++) { if ((await text()).includes(x)) return true; await sleep(200); } return false; }; const freshSend = async () => { await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => b.textContent.trim() === 'Receive')?.click()); await sleep(300); await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => b.textContent.trim() === 'Send')?.click()); await page.waitForSelector('textarea.send-dest', { timeout: 10000 }); await page.$eval('textarea.send-dest', (e) => { e.value = ''; e.dispatchEvent(new Event('input', { bubbles: true })); }); await sleep(300); await page.focus('textarea.send-dest'); }; const paste = async (s) => { await page.evaluate((v) => navigator.clipboard.writeText(v), s); await page.keyboard.down('Control'); await page.keyboard.press('KeyV'); await page.keyboard.up('Control'); }; try { await page.setViewport({ width: 390, height: 844 }); await page.goto(server.url.origin, { waitUntil: 'domcontentloaded' }); await sleep(400); await click('create a new wallet'); await sleep(500); await click('to import'); await sleep(400); await page.waitForSelector('textarea'); await page.type('textarea', generateMnemonic(wordlist)); await click('open wallet'); for (let i = 0; i < 80 && !(await page.evaluate(() => [...document.querySelectorAll('button')].some((b) => b.textContent.trim() === 'Send'))); i++) { await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => /^(not now|skip|continue|later)$/i.test(b.textContent.trim()))?.click()); await sleep(400); } await sleep(3000); const host = new URL(server.url.origin).hostname; console.log('[a login lnurl pasted into Send]'); await freshSend(); await paste(loginLnurl); check('the wallet asks first, naming the site', await waitText('Log in with Lightning') && (await text()).includes(host + ' is asking you to log in'), (await text()).slice(0, 200)); check('…says what it is about to do, and that nothing is paid', /key it keeps for this site alone/.test(await text()) && /No payment is made/.test(await text())); check('…no amount field, no payment flow', !(await page.$('input[type=number]'))); check('nothing was sent to the site before the user agreed', logins.length === 0); await click('log in'); check('the site accepts the signed challenge', await waitText('Logged in to ' + host, 8000), (await text()).slice(0, 300)); check('…it was told once, with a signature that verifies under the key', logins.length === 1 && logins[0].good && logins[0].k1 === k1, JSON.stringify(logins)); const key1 = logins[0].key; await click('done'); check('Done returns to a blank Send form', await page.waitForSelector('textarea.send-dest', { timeout: 5000 }).then(() => true, () => false) && (await page.$eval('textarea.send-dest', (e) => e.value)) === ''); console.log('[the same site again: the same key]'); await freshSend(); await paste(loginLnurl); await waitText('Log in with Lightning'); await click('log in'); await waitText('Logged in to ' + host, 8000); check('the wallet is the same user on the site next time', logins.length === 2 && logins[1].key === key1, JSON.stringify(logins.map((l) => l.key.slice(0, 12)))); await click('done'); console.log('[a site that says no]'); await freshSend(); await paste(closedLnurl); check('a register link asks to create an account', await waitText('asking you to create an account')); await click('create account'); check("the site's reason is shown", await waitText('registrations are closed', 8000), (await text()).slice(0, 300)); check('…with a way to try again, and back', (await text()).includes('Try again') && (await text()).includes('Back')); await click('back'); check('Back leaves the login', await page.waitForSelector('textarea.send-dest', { timeout: 5000 }).then(() => true, () => false)); check('no page errors', errs.length === 0, errs.join('; ').slice(0, 300)); } catch (e) { check('run completed', false, e.stack); } finally { await browser.close(); server.stop(true); } console.log(ok ? '\n✅ a login lnurl logs in' : '\n❌ failures above'); process.exit(ok ? 0 : 1);