Support LNURL-verify (#1103)

pages/api/lnurlp/[username]/pay.js

@@ -90,7 +90,8 @@ export default async ({ query: { username, amount, nostr, comment, payerdata: pa
 
     return res.status(200).json({
       pr: invoice.request,
-      routes: []
+      routes: [],
+      verify: `${process.env.NEXT_PUBLIC_URL}/api/lnurlp/${username}/verify/${invoice.id}`
     })
   } catch (error) {
     console.log(error)

pages/api/lnurlp/[username]/verify/[hash].js

@@ -0,0 +1,15 @@
+import lnd from '@/api/lnd'
+import { getInvoice } from 'ln-service'
+
+export default async ({ query: { hash } }, res) => {
+  try {
+    const inv = await getInvoice({ id: hash, lnd })
+    const settled = inv.is_confirmed
+    return res.status(200).json({ status: 'OK', settled, preimage: settled ? inv.secret : null, pr: inv.request })
+  } catch (err) {
+    if (err[1] === 'UnexpectedLookupInvoiceErr') {
+      return res.status(404).json({ status: 'ERROR', reason: 'not found' })
+    }
+    return res.status(500).json({ status: 'ERROR', reason: 'internal server error' })
+  }
+}