Enable WebLN wallet on 'webln:enabled' (#1385)

* Enable WebLN wallet on 'webln:enabled'

* Optimistically use WebLN for login with lightning

* Don't scope WebLN config to user

* Rename var to wallet

components/lightning-auth.js

@@ -27,6 +27,18 @@ function QrAuth ({ k1, encodedUrl, callbackUrl }) {
     }
   }, [data?.lnAuth])
 
+  useEffect(() => {
+    if (typeof window.webln === 'undefined') return
+
+    // optimistically use WebLN for authentication
+    async function effect () {
+      // this will also enable our WebLN wallet
+      await window.webln.enable()
+      await window.webln.lnurl(encodedUrl)
+    }
+    effect()
+  }, [encodedUrl])
+
   // output pubkey and k1
   return (
     <Qr value={encodedUrl} status='waiting for you' />

jsconfig.json

@@ -17,6 +17,9 @@
             "@/components/*": [
                 "components/*"
             ],
+            "@/wallets/*": [
+                "wallets/*"
+            ],
             "@/styles/*": [
                 "styles/*"
             ],

pages/_app.js

@@ -21,6 +21,7 @@ import { WalletLoggerProvider } from '@/components/wallet-logger'
 import { ChainFeeProvider } from '@/components/chain-fee.js'
 import dynamic from 'next/dynamic'
 import { HasNewNotesProvider } from '@/components/use-has-new-notes'
+import WebLnProvider from '@/wallets/webln'
 
 const PWAPrompt = dynamic(() => import('react-ios-pwa-prompt'), { ssr: false })
 
@@ -106,6 +107,7 @@ export default function MyApp ({ Component, pageProps: { ...props } }) {
               <HasNewNotesProvider>
                 <LoggerProvider>
                   <WalletLoggerProvider>
+                    <WebLnProvider>
                       <ServiceWorkerProvider>
                         <PriceProvider price={price}>
                           <LightningProvider>
@@ -124,6 +126,7 @@ export default function MyApp ({ Component, pageProps: { ...props } }) {
                           </LightningProvider>
                         </PriceProvider>
                       </ServiceWorkerProvider>
+                    </WebLnProvider>
                   </WalletLoggerProvider>
                 </LoggerProvider>
               </HasNewNotesProvider>

wallets/index.js

@@ -412,24 +412,26 @@ export function useWallets () {
 
 function getStorageKey (name, me) {
   let storageKey = `wallet:${name}`
-  if (me) {
+
+  // WebLN has no credentials we need to scope to users
+  // so we can use the same storage key for all users
+  if (me && name !== 'webln') {
     storageKey = `${storageKey}:${me.id}`
   }
+
   return storageKey
 }
 
 function enableWallet (name, me) {
   const key = getStorageKey(name, me)
-  const config = JSON.parse(window.localStorage.getItem(key))
+  const config = JSON.parse(window.localStorage.getItem(key)) || {}
-  if (!config) return
   config.enabled = true
   window.localStorage.setItem(key, JSON.stringify(config))
 }
 
 function disableWallet (name, me) {
   const key = getStorageKey(name, me)
-  const config = JSON.parse(window.localStorage.getItem(key))
+  const config = JSON.parse(window.localStorage.getItem(key)) || {}
-  if (!config) return
   config.enabled = false
   window.localStorage.setItem(key, JSON.stringify(config))
 }

wallets/webln/index.js

@@ -1,3 +1,6 @@
+import { useEffect } from 'react'
+import { useWallet } from 'wallets'
+
 export const name = 'webln'
 
 export const fields = []
@@ -19,3 +22,27 @@ export const card = {
   subtitle: 'use a [WebLN provider](https://www.webln.guide/ressources/webln-providers) for payments',
   badges: ['send only']
 }
+
+export default function WebLnProvider ({ children }) {
+  const wallet = useWallet(name)
+
+  useEffect(() => {
+    const onEnable = () => {
+      wallet.enablePayments()
+    }
+
+    const onDisable = () => {
+      wallet.disablePayments()
+    }
+
+    window.addEventListener('webln:enabled', onEnable)
+    // event is not fired by Alby browser extension but added here for sake of completeness
+    window.addEventListener('webln:disabled', onDisable)
+    return () => {
+      window.removeEventListener('webln:enabled', onEnable)
+      window.removeEventListener('webln:disabled', onDisable)
+    }
+  }, [])
+
+  return children
+}