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// "Sign in with Google" via pomegranate (fiatjaf): the user's nostr key is
// FROST-sharded across independent operators, and a central server
// coordinates NIP-46 signing behind Google OAuth — nobody, central included,
// holds the whole key, yet the Google account alone recovers it (threshold
// shards come back from the operators' /po/recover/google). The output here
// is a plain bunker:// URI: the rest of the login is hal's ordinary bunker
// flow, so the wallet-seed backup (encrypted to the user's own key, on
// relays) works unchanged and Google recovers the wallet too.
//
// Dynamically imported (its FROST dealer dependency rides in this chunk) —
// nothing here loads before the button is pressed.
//
// Reference: https://viewsource.win/fiatjaf.com/pomegranate — the
// implementation-guide steps are numbered in comments below. The kind-16440
// cross-central discovery step is deliberately skipped: it needs argon2id for
// nothing while the ecosystem has a single central server.
import { sha256 } from '@noble/hashes/sha256';
import { hex } from '@scure/base';
import { finalizeEvent, generateSecretKey } from 'nostr-tools/pure';
import { hexPubShard, hexShard, trustedKeyDeal } from '@jsr/fiatjaf__promenade-trusted-dealer';
// Which central: coinos runs its own (auth.coinos.io — the Google consent
// screen and the bunker relay carry our name), but accounts live PER
// central, so anyone who signed in while auth.njump.me was the default
// keeps a door to it (see nostrlogin's "previous server" line).
export const CENTRALS = { coinos: 'https://auth.coinos.io', legacy: 'https://auth.njump.me' };
export const DEFAULT_CENTRAL = CENTRALS.legacy; // flip to CENTRALS.coinos once its Google client is live
let CENTRAL = DEFAULT_CENTRAL;
const OPERATORS = [
'https://po.f7z.io',
'https://po.coracle.social',
'https://po.njump.me',
'https://po.jumble.social',
];
const THRESHOLD = 2;
const PICK = 3;
const api = (token) => async (path, opts = {}) => {
const r = await fetch(CENTRAL + path, {
...opts,
headers: { Authorization: 'Token ' + token, ...(opts.headers || {}) },
});
return r;
};
// Step 2-4: the popup is opened by the CALLER inside the click's user
// activation (a popup opened after our chunk finishes loading would be
// blocked); we point it at the login page and wait for the postMessage.
export function authenticate(popup) {
return new Promise((resolve, reject) => {
if (!popup) return reject(new Error('popup blocked'));
popup.location = CENTRAL + '/login/google';
const timer = setInterval(() => {
if (popup.closed) { cleanup(); reject(new Error('login window closed')); }
}, 500);
const handler = (event) => {
if (event.origin !== CENTRAL || !event.data || !event.data.token) return;
cleanup();
try { popup.close(); } catch {}
resolve(event.data.token);
};
const cleanup = () => { clearInterval(timer); window.removeEventListener('message', handler); };
window.addEventListener('message', handler);
});
}
const emailOf = (token) => {
try {
const evt = JSON.parse(atob(token));
return (evt.tags.find((t) => t[0] === 'email') || [])[1] || null;
} catch { return null; }
};
// Steps 8-14: shard a fresh key across randomly-picked operators and register
// everywhere. The secret key exists only inside this function and is wiped on
// the way out — from here on the key lives as shards, nowhere whole.
async function createAccount(token, email, onStatus) {
const ops = [...OPERATORS].sort(() => Math.random() - 0.5).slice(0, PICK);
const session = crypto.randomUUID();
const sk = generateSecretKey();
try {
onStatus && onStatus('splitting');
const skBig = Array.from(sk).reduce((acc, b) => (acc << 8n) + BigInt(b), 0n);
const { shards } = trustedKeyDeal(skBig, THRESHOLD, ops.length);
onStatus && onStatus('registering');
const regEvent = finalizeEvent({
kind: 20445,
created_at: Math.floor(Date.now() / 1000),
tags: [
['threshold', String(THRESHOLD)],
...ops.map((op, i) => ['operator', op, hexPubShard(shards[i].pubShard)]),
],
content: '',
}, sk);
const reg = await api(token)('/register', {
method: 'POST',
body: JSON.stringify(regEvent),
headers: { 'Content-Type': 'application/json', 'X-Pomegranate-Session': session },
});
if (!reg.ok) throw new Error('central registration failed (' + reg.status + ')');
for (let i = 0; i < ops.length; i++) {
const opEvent = finalizeEvent({
kind: 20444,
created_at: Math.floor(Date.now() / 1000),
tags: [['central', CENTRAL], ['email', email]],
content: hexShard(shards[i]),
}, sk);
const r = await fetch(ops[i] + '/po/register', {
method: 'POST',
body: JSON.stringify(opEvent),
headers: {
'Content-Type': 'application/json',
'X-Pomegranate-Operator-Token': hex.encode(sha256(new TextEncoder().encode(session + ':' + ops[i]))),
},
});
if (!r.ok) throw new Error('operator registration failed for ' + ops[i]);
}
} finally {
sk.fill(0); // step 17
}
// the operators confirm with central in the background — wait for it
for (let i = 0; i < 20; i++) {
await new Promise((r) => setTimeout(r, 1000));
const acc = await api(token)('/account');
if (acc.ok) return acc.json();
}
throw new Error('operators did not confirm the account in time');
}
// Steps 15-16: a reusable "default" profile is the bunker.
async function bunkerUri(token) {
const get = async () => {
const r = await api(token)('/profiles');
if (!r.ok) throw new Error('could not load signer profiles');
return r.json();
};
let profiles = await get();
if (!profiles.some((p) => p.name === 'default')) {
const r = await api(token)('/profiles', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ name: 'default' }),
});
if (!r.ok) throw new Error('could not create a signer profile');
profiles = await get();
}
const def = profiles.find((p) => p.name === 'default') || profiles[0];
if (!def) throw new Error('no signer profile available');
return `bunker://${def.handler_pubkey}?relay=${encodeURIComponent(CENTRAL.replace('http', 'ws'))}`;
}
// The whole flow: authenticate, find-or-create the sharded account, hand back
// a bunker URI. `popup` must come from the caller's click handler; `central`
// picks the server (default: DEFAULT_CENTRAL).
export async function loginWithGoogle(popup, { onStatus, central } = {}) {
CENTRAL = central || DEFAULT_CENTRAL;
const token = await authenticate(popup);
const email = emailOf(token);
if (!email) throw new Error('Google login returned no email');
onStatus && onStatus('checking');
const acc = await api(token)('/account');
if (!acc.ok && acc.status !== 404 && acc.status !== 401) {
throw new Error('signer server unavailable (' + acc.status + ')');
}
if (!acc.ok) await createAccount(token, email, onStatus);
onStatus && onStatus('connecting');
return { uri: await bunkerUri(token), email };
}
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