Lightning withdraw (LNURL-withdraw): a site's withdraw lnurl in Send gets paid to you; the media pager says when a picture can't be loaded. (1) LUD-03 (Adam, 2026-10-16: "add lnurlw support"): an lnurl whose terms are a withdrawRequest — found when the pay fetch meets one (fetchPayParams throws with the terms attached, resolve() takes them up) — shows the site, their range (or the fixed amount) and description, the amount field at their max; Withdraw makes an invoice over Ark for the amount (arkLnInvoice), hands it to their callback with k1 (submitWithdraw), and watches it (arkLnWatch): "has your invoice for…", then "Received …" on settlement; their refusal in their words, with Try again; Back before it is paid stops watching. An amount outside their range is told the range, nothing sent; a watch-only device says it can't receive. LUD-17 schemes lnurlw:// and lnurlp:// (and lightning: before them) are the URL over https, http on an onion (parseZapTarget). (2) A pager slide whose picture can't load — the server copy and then the original both failing (isolabellart's relay answering 502 that afternoon: the broken-picture glyph sat in the corner of a black slide) — hides the <img> and says "This picture couldn't be loaded" with the host, caption and controls kept (mp-gone / .mp-missing). tools/lnurl-auth-unit-test.js (lnurlw:// and lnurlp://, an onion, the terms, a pay fetch that finds a withdraw, the callback's k1 and pr, a refusal); tools/lnurl-withdraw-test.js (the zaps feature against a faked Ark and a stand-in site: the terms, max prefilled, out of range refused unsent, the invoice at the callback and watched, Received on settlement, a fixed amount with no field, Back unwatches, a refusal's reason); tools/pager-gone-picture-test.js; lnurl-auth and feed-picture-pager tests pass.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01J1Kon8bxJoHRpJdSzshCkp

1 files changed, 71 insertions, 4 deletions

diff --git a/src/features/zaps.js b/src/features/zaps.js
index f29fe83..d364738 100644
--- a/src/features/zaps.js
+++ b/src/features/zaps.js
@@ -13,7 +13,7 @@
 
 import { t } from '../i18n.js';
 import { npubOf } from '../nostr.js';
-import { parseZapTarget, zapTargetFromProfile, fetchPayParams, buildZapRequest, requestInvoice, parseLnurlAuth, lnurlAuthKey, lnurlAuthLogin } from '../lnurl.js';
+import { parseZapTarget, zapTargetFromProfile, fetchPayParams, buildZapRequest, requestInvoice, parseLnurlAuth, lnurlAuthKey, lnurlAuthLogin, submitWithdraw } from '../lnurl.js';
 import { HDKey } from '@scure/bip32';
 import { mnemonicToSeedSync } from '@scure/bip39';
 import { decodeNoffer } from '../noffer.js';
@@ -136,7 +136,13 @@ export function zapsFeature(ctx) {
 
       z.address = lnTarget.address || z.address;
     }
-    const params = await fetchPayParams(target.url);
+    let params;
+    try { params = await fetchPayParams(target.url); }
+    catch (e) {
+      // not a payment after all: the site wants to pay US (LUD-03)
+      if (e && e.withdraw) { if (ui.zap === z) beginWithdraw(e.withdraw, z); return; }
+      throw e;
+    }
     if (ui.zap !== z) return; // user navigated away
     // Name the payee like a human: LNURL metadata usually carries the
     // lightning address (text/identifier) — show that instead of a bech32
@@ -350,6 +356,67 @@ export function zapsFeature(ctx) {
       h('button', { class: 'btn-primary btn-block', onClick: () => doLogin(a) }, a.status === 'error' ? t('lnAuthRetry') : t(action === 'register' ? 'lnAuthGoRegister' : 'lnAuthGo')),
       h('button', { class: 'btn-ghost btn-block', onClick: back }, t('back')));
   }
+  // ---- Lightning withdraw (LNURL-withdraw) ----
+  // A site's withdraw lnurl: they will pay an invoice of ours, within their
+  // range. Ask the amount (their max to start; fixed when min = max), make
+  // the invoice over Ark, hand it over, and watch for the money.
+  function beginWithdraw(w, z) {
+    const maxSat = Math.floor(w.maxMsat / 1000), minSat = Math.ceil(w.minMsat / 1000);
+    ui.zap = null; ui.sendError = '';
+    ui.lnWithdraw = { w, minSat, maxSat, fixed: minSat >= maxSat, amount: ctx.amountField(maxSat), status: 'ask', address: z && z.address };
+    render();
+  }
+  async function doWithdraw(d) {
+    const sats = d.fixed ? d.maxSat : (parseAmount(d.amount, getUnit()) || 0);
+    if (!(sats >= Math.max(1, d.minSat) && sats <= d.maxSat)) { d.error = t('lnWithdrawRange', { min: fmtAmount(d.minSat), max: fmtAmount(d.maxSat), unit: unitLabel() }); render(); return; }
+    if (wallet.watchOnly) { d.error = t('lnWithdrawWatchOnly'); render(); return; }
+    d.sats = sats; d.status = 'busy'; d.error = ''; render();
+    try {
+      const inv = await hook('arkLnInvoice', sats, (d.w.description || t('lnWithdrawMemo', { domain: d.w.domain })).slice(0, 120));
+      if (!inv || !inv.invoice) throw new Error(t('lnWithdrawNoInvoice'));
+      if (ui.lnWithdraw !== d) { hook('arkLnCancel', inv.id); return; }
+      await submitWithdraw(d.w, inv.invoice);
+      if (ui.lnWithdraw !== d) return;
+      d.status = 'sent'; d.lnId = inv.id;
+      hook('arkLnWatch', inv.id, (a) => { if (ui.lnWithdraw !== d) return; d.status = a && a.step === 'done' ? 'paid' : 'error'; if (d.status === 'error') d.error = t('lnWithdrawNotPaid'); render(); });
+    } catch (e) {
+      if (ui.lnWithdraw !== d) return;
+      d.status = 'error'; d.error = e.message || String(e);
+    }
+    render();
+  }
+  function lnWithdrawView() {
+    const d = ui.lnWithdraw;
+    if (!d) return null;
+    const domain = d.w.domain;
+    const back = () => { if (d.lnId && d.status !== 'paid') hook('arkLnUnwatch', d.lnId); ui.lnWithdraw = null; ui.sendError = ''; ui.send = blankSend(); render(); };
+    const heading = '⚡ ' + t('lnWithdrawTitle');
+    if (d.status === 'busy') {
+      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('lnWithdrawAsking', { domain })));
+    }
+    if (d.status === 'sent' || d.status === 'paid') {
+      const paid = d.status === 'paid';
+      return h('div', { class: 'card col', style: 'align-items:center;text-align:center;gap:14px;padding:32px 14px' },
+        paid ? h('div', { class: 'check-badge' }, '✓') : h('span', { class: 'spinner' }),
+        h('h3', { style: 'margin:0' }, paid ? t('lnWithdrawPaid', { amount: fmtAmount(d.sats) + ' ' + unitLabel() }) : t('lnWithdrawSent', { amount: fmtAmount(d.sats) + ' ' + unitLabel(), domain })),
+        paid ? null : h('p', { class: 'small muted', style: 'margin:0' }, t('lnWithdrawSentHint')),
+        h('button', { class: paid ? 'btn-primary btn-block' : 'btn-ghost btn-block', onClick: back }, paid ? t('done') : t('back')));
+    }
+    return h('div', { class: 'card col', style: 'gap:12px' },
+      h('h3', {}, heading),
+      h('div', { class: 'small', style: 'font-size:18px;font-weight:600;word-break:break-all' }, domain),
+      d.w.description ? h('p', { class: 'small muted', style: 'margin:0' }, d.w.description) : null,
+      h('p', { class: 'small muted', style: 'margin:0' }, d.fixed ? t('lnWithdrawFixed', { amount: fmtAmount(d.maxSat) + ' ' + unitLabel(), domain })
+        : t('lnWithdrawOffer', { min: fmtAmount(d.minSat), max: fmtAmount(d.maxSat), unit: unitLabel(), domain })),
+      d.fixed ? null : h('div', { class: 'row gap6', style: 'align-items:center' },
+        h('input', { type: 'number', min: '0', inputmode: 'decimal', placeholder: t('lnPayAmount'), value: d.amount, onInput: (e) => { d.amount = e.target.value; d.error = ''; render(); } }),
+        unitTag(),
+        h('button', { type: 'button', onClick: () => { d.amount = ctx.amountField(d.maxSat); d.error = ''; render(); } }, t('max'))),
+      d.error ? h('div', { class: 'notice err' }, d.error) : null,
+      h('button', { class: 'btn-primary btn-block', onClick: () => doWithdraw(d) }, d.status === 'error' ? t('lnAuthRetry') : t('lnWithdrawGo')),
+      h('button', { class: 'btn-ghost btn-block', onClick: back }, t('back')));
+  }
   function zapView() {
     const z = ui.zap;
     if (!z) return null;
@@ -535,8 +602,8 @@ export function zapsFeature(ctx) {
       begin({ kind: 'npub', pk, eventId: eventId || null }, shortNpub(npub || npubOf(pk)));
       return true;
     },
-    resetSend() { ui.zap = null; ui.lnAuth = null; },
-    sendView() { return lnAuthView() || zapView(); },
+    resetSend() { ui.zap = null; ui.lnAuth = null; ui.lnWithdraw = null; },
+    sendView() { return lnAuthView() || lnWithdrawView() || zapView(); },
     // Settings → Nostr: the one-tap zap amount.
     nostrSettingsCards() {
       const cur = ctx.zapDefaultSat ? ctx.zapDefaultSat() : 0;