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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, deviceDtag, isOurDtag, fetchNostrProfile, PROFILE_RELAYS } from '../nostr.js';
import { t } from '../i18n.js';
// Keep a published snapshot under the relay's event-size cap. relay.coinos.io
// rejects events over 64KB and nip44 expands the plaintext ~1.5x, so the JSON
// must stay under ~40KB. The on-chain tx history is the main unbounded growth;
// drop the oldest (this.txs is newest-first) — another device backfills the
// rest with a rescan. Only trims oversized snapshots, so typical wallets are
// untouched.
const RELAY_JSON_BUDGET = 40000;
function trimForRelay(snap) {
if (JSON.stringify(snap).length <= RELAY_JSON_BUDGET) return snap;
const s = { ...snap };
let txs = (s.txs || []).slice();
while (txs.length > 25 && JSON.stringify(s).length > RELAY_JSON_BUDGET) {
txs = txs.slice(0, Math.max(25, txs.length - 25));
s.txs = txs;
}
return s;
}
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);
},
// Sign an event with our nostr key without publishing (NIP-57 zap request).
nostrSign(partial) { return this.nostr ? this.nostr.signEvent(partial) : null; },
// Fetch a pubkey's profile (name/picture + lud16/lud06 for zaps) from the
// broad profile relays — independent of whether cross-device sync is on.
async nostrProfile(pkHex) {
if (this.offline) return null;
return fetchNostrProfile(pkHex);
},
// Relays to advertise in a zap request so we can later find the receipt:
// our sync relays plus the broad profile relays.
nostrRelays() {
const sync = getSyncConfig();
const base = sync.enabled ? sync.relays : [];
return [...new Set([...base, ...PROFILE_RELAYS])].slice(0, 8);
},
// 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);
let all;
try {
all = await this.nostr.fetchAllStates();
} catch {
return false;
}
// Each device publishes to its OWN slot now, so there can be several
// snapshots for this network. Keep only ours-for-this-network: the
// netName inside is the real guard against cross-network bleed (legacy
// shared-tag events are ambiguous), the d-tag check filters the rest.
const mine = all.filter((s) => s.state.netName === this.netName && isOurDtag(s.dtag, this.netName));
if (!mine.length) return false;
// Merge every device's merge-safe extension state (ark vtxos union) — a
// device sees ALL devices' coins, not only the newest snapshot's.
for (const s of mine) this._mergeSnapshotExtensions(s.state);
// Apply the newest FULL snapshot for the rescannable on-chain state.
const newest = mine[0].state; // fetchAllStates returns newest-first
if ((newest.savedAt || 0) > (this._savedAt || 0)) {
this._applySnapshot(newest); // re-runs extension loads (idempotent merge)
this.emit();
}
this.saveCache(); // persist the merged result + republish our own slot
return true;
},
});
// 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 ALL our devices' slots so a save on
// another device merges here within seconds. Merge-safe extension state (ark
// vtxos union) applies live; full snapshots stay a load-time affair. With
// per-device slots no device overwrites another's, so this only ever adds.
let stateUnsub = null;
wallet.registerRealtimeHook({
start: () => {
const sync = getSyncConfig();
if (!sync.enabled || !wallet.nostr.pk) return;
wallet.nostr.setRelays(sync.relays);
if (stateUnsub) { try { stateUnsub(); } catch {} }
stateUnsub = wallet.nostr.subscribeStates((v, dtag) => {
if (!v.netName || v.netName !== wallet.netName) return;
if (!isOurDtag(dtag, wallet.netName)) return;
if (dtag === deviceDtag(wallet.netName) && (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 —
// to THIS DEVICE's own slot, so it never clobbers another device's.
wallet.registerCacheSavedHook((snap) => {
const sync = getSyncConfig();
if (wallet.offline || !sync.enabled) return;
wallet.nostr.setRelays(sync.relays);
// bind the per-device d-tag now: the debounced publish must keep this
// snapshot's network even if the wallet switches networks before it fires
const dtag = deviceDtag(wallet.netName);
clearTimeout(wallet._nostrPubTimer);
wallet._nostrPubTimer = setTimeout(() => wallet.nostr.publish(trimForRelay(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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