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// Cross-device sync feature — encrypted wallet state on Nostr relays
// (NIP-44 to self, replaceable kind 30078) plus the wallet's nostr identity
// (used e.g. to DM locked-gift claim codes). Installed onto the core wallet;
// a build without sync ships none of it and never talks to a relay.
import { NostrSync, getSyncConfig, setSyncConfig, npubOf, syncDtag } from '../nostr.js';
import { t } from '../i18n.js';
export function installSyncWallet(wallet) {
if (wallet.syncFromNostr) return; // already installed
wallet.nostr = new NostrSync();
wallet._nostrPubTimer = null;
Object.assign(wallet, {
// Our nostr identity (used to DM a locked gift's claim code to the recipient).
nostrPubkey() { return (this.nostr && this.nostr.pk) || null; },
nostrNpub() { const pk = this.nostrPubkey(); return pk ? npubOf(pk) : null; },
// Send a nostr DM (e.g. a locked gift's claim code) to a recipient pubkey.
async sendNostrDM(recipientPkHex, text) {
return this.nostr && this.nostr.sk ? this.nostr.sendDM(recipientPkHex, text) : false;
},
// Generic event publish/fetch on the configured sync relays — the seam
// other features (ark zaps) use to speak their own kinds. No-ops when
// sync is disabled or the wallet is offline.
async nostrPublish(partial) {
const sync = getSyncConfig();
if (this.offline || !sync.enabled || !this.nostr.sk) return null;
this.nostr.setRelays(sync.relays);
return this.nostr.publishEvent(partial);
},
async nostrFetch(filter, maxWait) {
const sync = getSyncConfig();
if (this.offline || !sync.enabled) return [];
this.nostr.setRelays(sync.relays);
return this.nostr.fetchEvents(filter, maxWait);
},
nostrSubscribe(filter, onEvent) {
const sync = getSyncConfig();
if (this.offline || !sync.enabled) return () => {};
this.nostr.setRelays(sync.relays);
return this.nostr.subscribeEvents(filter, onEvent);
},
// Pull the latest state from Nostr; apply it if it's newer than what we have.
// Returns true if state was applied (so the caller can skip a full scan).
async syncFromNostr() {
const sync = getSyncConfig();
if (this.offline || !sync.enabled) return false;
this.nostr.setRelays(sync.relays);
this.nostr.setDtag(syncDtag(this.netName));
let remote;
try {
remote = await this.nostr.fetch();
} catch {
return false;
}
if (!remote) return false;
// A snapshot for another network must never apply here. Legacy events
// (published before snapshots carried netName) are ambiguous — they can
// hold ANY network's state under the shared d-tag, and applying one
// poisoned a mainnet wallet with regtest coins — so they are never
// applied either; a full scan is safer than a wrong snapshot.
if (remote.netName !== this.netName) return false;
if ((remote.savedAt || 0) > (this._savedAt || 0)) {
this._applySnapshot(remote);
this.saveCache(); // mirror into localStorage
this.emit();
return true;
}
// Our local copy is newer (or equal) — but merge-safe extension state
// (ark vtxos) still flows in from the older snapshot before we push up.
this._mergeSnapshotExtensions(remote);
if ((this._savedAt || 0) > (remote.savedAt || 0)) this.saveCache();
return true; // remote existed, so no full scan needed
},
});
// identity follows the open wallet
wallet.registerLoadHook(() => {
if (wallet.mnemonic) wallet.nostr.load(wallet.mnemonic, wallet.passphrase);
else wallet.nostr.unload();
});
// Live cross-device state: subscribe to our own replaceable event so a save
// on another device merges here within seconds. Only merge-safe extension
// state (ark vtxos) applies live — full snapshots stay a load-time affair —
// which also guarantees every snapshot we publish is a superset, so the
// replaceable event on the relay never loses another device's coins.
let stateUnsub = null;
wallet.registerRealtimeHook({
start: () => {
const sync = getSyncConfig();
if (!sync.enabled || !wallet.nostr.pk) return;
wallet.nostr.setRelays(sync.relays);
wallet.nostr.setDtag(syncDtag(wallet.netName));
if (stateUnsub) { try { stateUnsub(); } catch {} }
stateUnsub = wallet.nostr.subscribeStates((v) => {
if (!v.netName || v.netName !== wallet.netName) return;
if ((v.savedAt || 0) === (wallet._savedAt || 0)) return; // our own echo
wallet._mergeSnapshotExtensions(v);
});
},
stop: () => { if (stateUnsub) { try { stateUnsub(); } catch {} stateUnsub = null; } },
});
// push every saved snapshot to the relays (debounced) unless sync is off
wallet.registerCacheSavedHook((snap) => {
const sync = getSyncConfig();
if (wallet.offline || !sync.enabled) return;
wallet.nostr.setRelays(sync.relays);
// bind the d-tag now: the debounced publish must keep this snapshot's
// network even if the wallet switches networks before the timer fires
const dtag = syncDtag(wallet.netName);
clearTimeout(wallet._nostrPubTimer);
wallet._nostrPubTimer = setTimeout(() => wallet.nostr.publish(snap, dtag), 2500);
});
wallet.registerRealtimeHook({ stop: () => clearTimeout(wallet._nostrPubTimer) });
}
export function syncFeature(ctx) {
const { h, ui, render, wallet } = ctx;
installSyncWallet(wallet);
// Cross-device sync settings: toggle + editable relay list (default coinos).
function syncCard() {
const cfg = getSyncConfig();
const setEnabled = (enabled) => {
if (enabled === cfg.enabled) return;
setSyncConfig({ enabled, relays: cfg.relays });
render();
// On enable, pull anything newer from the relays, then push our copy up.
if (enabled && !wallet.offline) {
wallet.syncFromNostr().catch(() => {}).finally(() => wallet.saveCache());
}
};
return h(
'div',
{ class: 'card col' },
h('h3', {}, t('deviceSync')),
h('p', { class: 'small muted', style: 'margin:0' }, t('deviceSyncDesc')),
h('div', { class: 'row between' },
h('span', { class: 'lab', style: 'margin:0' }, t('syncAcross')),
h('div', { class: 'seg' },
h('button', { type: 'button', class: cfg.enabled ? 'active' : '', onClick: () => setEnabled(true) }, t('syncOn')),
h('button', { type: 'button', class: !cfg.enabled ? 'active' : '', onClick: () => setEnabled(false) }, t('syncOff'))
)
),
cfg.enabled
? h('label', { class: 'field' },
h('span', { class: 'lab' }, t('relaysLabel')),
h('textarea', {
placeholder: 'wss://relay.example.com',
autocapitalize: 'none', autocomplete: 'off', spellcheck: 'false',
style: 'min-height:64px',
value: cfg.relays.join('\n'),
onInput: (e) => {
const relays = e.target.value.split('\n').map((s) => s.trim()).filter(Boolean);
setSyncConfig({ enabled: true, relays });
},
}),
h('div', { class: 'small faint' }, t('relaysHint'))
)
: null
);
}
return {
id: 'sync',
settingsCards() {
return wallet.watchOnly || !wallet.mnemonic ? [] : [syncCard()];
},
};
}
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