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// Lightning swaps feature (Boltz reverse/submarine) — receive over LN,
// pay bolt11 invoices, provider settings. Extracted from app.js; the
// protocol layer lives in ../swap.js.
import { SwapManager, installSwapWallet } from '../swap.js';
import { getNetwork, getBoltzApi, BOLTZ_PRESETS, getBoltzProviderId, setBoltzProviderId, getBoltzCustom, setBoltzCustom } from '../api.js';
import { t } from '../i18n.js';
import { qrSvg } from '../qr.js';
import { fmtBtc } from '../format.js';
// A bolt11 Lightning invoice (any network prefix); long ln-prefixed bech32 string.
function isLnInvoice(v) { v = (v || '').trim(); return /^ln[a-z0-9]+$/i.test(v) && v.length > 50; }
export function swapsFeature(ctx) {
const { h, ui, render, wallet, blankSend, fmtAmount, unitLabel, copyBtn } = ctx;
installSwapWallet(wallet); // swap storage/keys live outside the core wallet
// Boltz swap orchestrator (reverse = receive over LN, submarine = spend over LN).
const swaps = new SwapManager({
wallet, network: getNetwork(), getApi: getBoltzApi,
feeRate: 2, onUpdate: () => render(),
});
function lnReceiveContent() {
if (!ui.swapLimits && !ui._swapLimitsLoading) {
ui._swapLimitsLoading = true;
swaps.reverseLimits().then((l) => { ui.swapLimits = l; ui._swapLimitsLoading = false; render(); }).catch(() => { ui._swapLimitsLoading = false; });
}
const lim = ui.swapLimits;
let rec = ui.lnReceiveId ? swaps.list().find((s) => s.id === ui.lnReceiveId) : null;
if (rec && ['claimed', 'success'].includes(rec.status)) {
// Claimed — the coin is credited on-chain (swap.js → creditReceive), so the
// generic "Payment received!" celebration shows it like any receive. Just
// reset the Lightning flow back to its form.
ui.lnReceiveId = null;
rec = null;
}
if (rec) {
let svg = null;
try { svg = qrSvg(rec.invoice.toUpperCase(), { ec: 'L', mode: 'Alphanumeric' }); } catch {}
return [
h('p', { class: 'small muted', style: 'margin:0;text-align:center' }, t('lnReceiveAwaiting')),
svg ? h('div', { html: svg }) : null,
h('div', { class: 'addr-box break', style: 'width:100%;font-size:11px' }, rec.invoice),
copyBtn(rec.invoice, t('copyInvoice')),
h('div', { class: 'row gap6', style: 'align-items:center' }, h('span', { class: 'spinner sm' }), h('span', { class: 'small muted' }, t('lnReceiveWatching'))),
h('button', { class: 'btn-ghost btn-block', onClick: () => { ui.lnReceiveId = null; ui.swapReverseAmt = ''; ui.swapError = ''; render(); } }, t('back')),
];
}
return [
h('p', { class: 'small muted', style: 'margin:0;text-align:center' }, t('lnReceiveIntro')),
h('label', { class: 'field', style: 'width:100%' },
h('span', { class: 'lab' }, t('amountSatsLabel')),
h('input', { type: 'number', inputmode: 'numeric', placeholder: '', value: ui.swapReverseAmt || '', onInput: (e) => { ui.swapReverseAmt = e.target.value; } }),
lim ? h('span', { class: 'small muted' }, `Min ${lim.min.toLocaleString()} · max ${lim.max.toLocaleString()} sats`) : null),
ui.swapError ? h('div', { class: 'notice err' }, ui.swapError) : null,
h('button', { class: 'btn-primary btn-block', disabled: !!ui.swapBusy, onClick: doReverse }, ui.swapBusy ? h('span', { class: 'spinner' }) : t('lnCreateInvoice')),
];
}
async function doReverse() {
const amt = parseInt((ui.swapReverseAmt || '').trim(), 10);
const lim = ui.swapLimits || (ui.swapLimits = await swaps.reverseLimits());
if (!amt || amt < lim.min || amt > lim.max) { ui.swapError = `Enter ${lim.min.toLocaleString()}–${lim.max.toLocaleString()} sats`; return render(); }
ui.swapError = ''; ui.swapBusy = true; render();
try { const rec = await swaps.startReverse(amt); ui.lnReceiveId = rec.id; ui.swapReverseAmt = ''; }
catch (e) { ui.swapError = e.message; }
ui.swapBusy = false; render();
}
async function doRefund(id) {
ui.swapError = ''; ui.swapBusy = true; render();
try { await swaps.refundSubmarine(id); }
catch (e) { ui.swapError = e.message; }
ui.swapBusy = false; render();
}
function boltzProviderCard() {
const id = getBoltzProviderId();
const custom = getBoltzCustom();
return h(
'div',
{ class: 'card col' },
h('h3', {}, '⚡ Swap provider'),
h('p', { class: 'small muted', style: 'margin:0' }, 'Boltz-compatible provider for Lightning swaps. Non-custodial: a provider can fail a swap but never take your funds.'),
h('select', { onChange: (e) => { setBoltzProviderId(e.target.value); ui.swapLimits = null; render(); } },
BOLTZ_PRESETS.map((p) => h('option', { value: p.id, selected: p.id === id }, p.label))),
id === 'custom'
? h('div', { class: 'col', style: 'gap:8px' },
h('label', { class: 'field' },
h('span', { class: 'lab' }, 'API URL'),
h('input', {
type: 'text', class: 'mono-input', placeholder: 'https://api.example.com',
autocapitalize: 'none', autocomplete: 'off', spellcheck: 'false', value: custom.api,
onChange: (e) => { setBoltzCustom({ api: e.target.value.trim(), ws: custom.ws }); ui.swapLimits = null; render(); },
})),
h('label', { class: 'field' },
h('span', { class: 'lab' }, 'WebSocket URL (optional)'),
h('input', {
type: 'text', class: 'mono-input', placeholder: 'wss://api.example.com/v2/ws',
autocapitalize: 'none', autocomplete: 'off', spellcheck: 'false', value: custom.ws,
onChange: (e) => { setBoltzCustom({ api: custom.api, ws: e.target.value.trim() }); render(); },
}),
h('div', { class: 'small faint' }, 'Left blank, the WS is derived from the API URL.')))
: h('div', { class: 'small faint', style: 'word-break:break-all' }, getBoltzApi())
);
}
function swapTxDetailSection(swap, tx) {
const u = ' ' + unitLabel();
const line = (k, v) => h('div', { class: 'line' }, h('span', { class: 'k' }, k), h('span', { class: 'v' }, v));
const head = (txt) => h('div', { style: 'font-weight:600;margin:12px 0 2px' }, txt);
if (swap.refundTxid === tx.txid)
return h('div', { class: 'summary col', style: 'gap:0' }, head('↩ Lightning swap refund'), line(t('status'), 'Refunded ✓'));
if (swap.kind === 'submarine') {
const fee = (swap.expectedAmount || 0) - (swap.invoiceAmount || 0);
const st = swap.status === 'success' ? 'Invoice paid ✓'
: swap.status === 'refundable' ? 'Payment failed — refundable'
: swap.status === 'refunded' ? 'Refunded' : 'Paying…';
return h('div', { class: 'summary col', style: 'gap:0' },
head('⚡ Paid over Lightning'),
swap.invoiceAmount != null ? line('Invoice', fmtAmount(swap.invoiceAmount) + u) : null,
fee > 0 ? line('Swap fee', fmtAmount(fee) + u) : null,
line(t('status'), st),
swap.status === 'refundable'
? h('button', { class: 'btn-sm btn-block', style: 'margin-top:8px', disabled: !!ui.swapBusy, onClick: () => doRefund(swap.id) }, 'Refund on-chain')
: null);
}
// reverse swap claim
return h('div', { class: 'summary col', style: 'gap:0' },
head('⚡ Received over Lightning'),
line(t('status'), swap.status === 'claimed' ? 'Settled ✓' : swap.status));
}
async function startLnSend(invoice) {
ui.sendError = ''; ui.lnSend = null; ui.lnSent = null; ui.lnSendBusy = true; render();
try { ui.lnSend = await swaps.quoteSubmarine(invoice); }
catch (e) { ui.sendError = e.message; }
ui.lnSendBusy = false; render();
}
async function doLnPay() {
if (!ui.lnSend) return;
ui.sendError = ''; ui.lnSendBusy = true; render();
try { const rec = await swaps.fundQuotedSubmarine(ui.lnSend); ui.lnSent = { amount: ui.lnSend.invoiceAmount, id: rec.id }; }
catch (e) { ui.sendError = e.message; }
ui.lnSendBusy = false; render();
}
function lnSendReview() {
const u = ' ' + unitLabel();
if (ui.lnSent) {
return h('div', { class: 'col', style: 'gap:16px' },
h('div', { class: 'card col', style: 'align-items:center;text-align:center;gap:8px' },
h('div', { class: 'check-badge' }, '⚡'),
h('h2', { style: 'margin:0' }, t('lnPaySentTitle')),
ui.lnSent.amount ? h('div', { class: 'amount-pos', style: 'font-size:18px' }, fmtAmount(ui.lnSent.amount) + u) : null,
h('p', { class: 'muted', style: 'margin:0' }, t('lnPaySentBody'))),
h('button', { class: 'btn-primary btn-block', onClick: () => { ui.lnSent = null; ui.lnSend = null; ui.send = blankSend(); ui.tab = 'history'; render(); } }, t('done')));
}
const q = ui.lnSend;
const row = (label, sats, bold) => h('div', { class: 'row', style: 'justify-content:space-between' + (bold ? ';font-weight:600' : '') },
h('span', { class: bold ? '' : 'small muted' }, label), h('span', {}, fmtAmount(sats) + u));
return h('div', { class: 'col', style: 'gap:12px' },
h('div', { class: 'card col', style: 'gap:10px' },
h('h3', { style: 'margin:0' }, t('lnPayTitle')),
q.invoiceAmount != null ? row(t('lnPayAmount'), q.invoiceAmount) : null,
q.boltzFee != null ? row(t('lnPayBoltzFee'), q.boltzFee) : null,
row(t('lnPayNetworkFee'), q.networkFee),
h('div', { style: 'border-top:1px solid var(--line, #ddd);margin:2px 0' }),
row(t('lnPayTotal'), q.total, true)),
ui.sendError ? h('div', { class: 'notice err' }, ui.sendError) : null,
h('button', { class: 'btn-primary btn-block', disabled: !!ui.lnSendBusy, onClick: doLnPay }, ui.lnSendBusy ? h('span', { class: 'spinner' }) : t('lnPayConfirm')),
h('button', { class: 'btn-ghost btn-block', onClick: () => { ui.lnSend = null; ui.sendError = ''; render(); } }, t('back')));
}
return {
id: 'swaps',
// wallet activated: re-attach in-flight swap watchers
init() {
swaps.network = getNetwork();
if (!wallet.watchOnly) { try { swaps.resumeAll(); } catch {} }
},
networkChanged(net) { swaps.network = net; ui.swapLimits = null; },
receiveModes() {
// a reverse swap needs our keys to claim on-chain
if (wallet.watchOnly) return [];
return [{
id: 'ln', label: t('receiveLnTab'),
render: (seg) => h('div', { class: 'card col', style: 'align-items:center;gap:14px' }, seg, ...lnReceiveContent()),
}];
},
// a pasted/typed/scanned bolt11 auto-advances to its own confirmation
matchSendText(text) {
const inv = (text || '').trim().replace(/^lightning:/i, '');
if (ui.send.recipients.length === 1 && !ui.lnSendBusy && !ui.lnSend && isLnInvoice(inv)) {
startLnSend(inv);
return true;
}
return false;
},
interceptReview(s) {
const target = s.recipients.length === 1 ? (s.recipients[0].address || '').trim().replace(/^lightning:/i, '') : '';
if (isLnInvoice(target)) { startLnSend(target); return true; }
return false;
},
sendView() {
if (ui.lnSent || ui.lnSend) return lnSendReview();
if (ui.lnSendBusy) return h('div', { class: 'card col', style: 'align-items:center;gap:14px;padding:32px 14px' }, h('span', { class: 'spinner' }), h('p', { class: 'muted', style: 'margin:0' }, t('lnQuoting')));
return null;
},
txDetailSection(tx) {
const swap = swaps.findByTxid(tx.txid);
return swap ? swapTxDetailSection(swap, tx) : null;
},
findByTxid(txid) { return swaps.findByTxid(txid); },
settingsCards() { return [boltzProviderCard()]; },
};
}
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