Various LUD-18 fixes

* Debounce the `onAddrChange` event handler when sending to a LN Address,
so we more accurately display the input form for LUD-12 and LUD-18 options

* Remove explicit URI encoding of Payer Data when sending to a LN Addr, since we're getting encoding for free via URLSearchParams

* Append `@stacker.news` to identifier values sent in payer data

* Don't do extra decoding when receiving LUD-18 data

api/resolvers/wallet.js

@@ -290,7 +290,7 @@ export default {
       if (payer) {
         payer = {
           ...payer,
-          identifier: payer.identifier ? me.name : undefined
+          identifier: payer.identifier ? `${me.name}@stacker.news` : undefined
         }
         payer = Object.fromEntries(
           Object.entries(payer).filter(([, value]) => !!value)
@@ -305,10 +305,10 @@ export default {
         callback.searchParams.append('comment', comment)
       }
 
-      let encodedPayerData = ''
+      let stringifiedPayerData = ''
       if (payer && Object.entries(payer).length) {
-        encodedPayerData = encodeURIComponent(JSON.stringify(payer))
-        callback.searchParams.append('payerdata', encodedPayerData)
+        stringifiedPayerData = JSON.stringify(payer)
+        callback.searchParams.append('payerdata', stringifiedPayerData)
       }
 
       // call callback with amount and conditionally comment
@@ -320,7 +320,7 @@ export default {
       // decode invoice
       try {
         const decoded = await decodePaymentRequest({ lnd, request: res.pr })
-        if (decoded.description_hash !== lnurlPayDescriptionHash(`${options.metadata}${encodedPayerData}`)) {
+        if (decoded.description_hash !== lnurlPayDescriptionHash(`${options.metadata}${stringifiedPayerData}`)) {
           throw new Error('description hash does not match')
         }
         if (!decoded.mtokens || BigInt(decoded.mtokens) !== BigInt(milliamount)) {

package-lock.json

@@ -36,6 +36,7 @@
         "graphql-type-json": "^0.3.2",
         "jose1": "npm:jose@^1.27.2",
         "ln-service": "^56.11.0",
+        "lodash.debounce": "^4.0.8",
         "mathjs": "^11.9.1",
         "mdast-util-find-and-replace": "^3.0.0",
         "mdast-util-from-markdown": "^2.0.0",

package.json

@@ -39,6 +39,7 @@
     "graphql-type-json": "^0.3.2",
     "jose1": "npm:jose@^1.27.2",
     "ln-service": "^56.11.0",
+    "lodash.debounce": "^4.0.8",
     "mathjs": "^11.9.1",
     "mdast-util-find-and-replace": "^3.0.0",
     "mdast-util-from-markdown": "^2.0.0",

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

@@ -50,7 +50,7 @@ export default async ({ query: { username, amount, nostr, comment, payerdata: pa
     let parsedPayerData
     if (payerData) {
       try {
-        parsedPayerData = JSON.parse(decodeURIComponent(payerData))
+        parsedPayerData = JSON.parse(payerData)
       } catch (err) {
         console.error('failed to parse payerdata', err)
         return res.status(400).json({ status: 'ERROR', reason: 'Invalid JSON supplied for payerdata parameter' })

pages/wallet.js

@@ -8,7 +8,7 @@ import { CenterLayout } from '../components/layout'
 import InputGroup from 'react-bootstrap/InputGroup'
 import { WithdrawlSkeleton } from './withdrawals/[id]'
 import { useMe } from '../components/me'
-import { useEffect, useState } from 'react'
+import { useCallback, useEffect, useState } from 'react'
 import { requestProvider } from 'webln'
 import Alert from 'react-bootstrap/Alert'
 import { CREATE_WITHDRAWL, SEND_TO_LNADDR } from '../fragments/wallet'
@@ -21,6 +21,7 @@ import styles from '../components/user-header.module.css'
 import HiddenWalletSummary from '../components/hidden-wallet-summary'
 import AccordianItem from '../components/accordian-item'
 import { lnAddrOptions } from '../lib/lnurl'
+import debounce from 'lodash.debounce'
 
 export const getServerSideProps = getGetServerSideProps({ authRequired: true })
 
@@ -300,7 +301,7 @@ export function LnAddrWithdrawal () {
   const [addrOptions, setAddrOptions] = useState(defaultOptions)
   const [formSchema, setFormSchema] = useState(lnAddrSchema())
 
-  const onAddrChange = async (formik, e) => {
+  const onAddrChange = useCallback(debounce(async (formik, e) => {
     let options
     try {
       options = await lnAddrOptions(e.target.value)
@@ -312,7 +313,7 @@ export function LnAddrWithdrawal () {
 
     setAddrOptions(options)
     setFormSchema(lnAddrSchema(options))
-  }
+  }, 500), [lnAddrOptions, lnAddrSchema])
 
   return (
     <>