From d3ca87a78bfe85b37fd1fe2f94b8304c2cc3f33b Mon Sep 17 00:00:00 2001
From: ekzyis <ek@stacker.news>
Date: Tue, 23 Jul 2024 13:23:48 -0500
Subject: [PATCH] Add WebLN for sending payments (#1274)

* Add WebLN for sending payments

* attach docs for alby

---------

Co-authored-by: Keyan <34140557+huumn@users.noreply.github.com>
Co-authored-by: keyan <keyan.kousha+huumn@gmail.com>
---
 components/wallet-buttonbar.js     |  2 +-
 pages/settings/wallets/[wallet].js | 15 +++++++++++++--
 wallets/README.md                  |  4 ++++
 wallets/client.js                  |  3 ++-
 wallets/index.js                   | 15 ++++++++++++++-
 wallets/webln/ATTACH.md            | 10 ++++++++++
 wallets/webln/client.js            | 21 +++++++++++++++++++++
 wallets/webln/index.js             | 13 +++++++++++++
 8 files changed, 78 insertions(+), 5 deletions(-)
 create mode 100644 wallets/webln/ATTACH.md
 create mode 100644 wallets/webln/client.js
 create mode 100644 wallets/webln/index.js

diff --git a/components/wallet-buttonbar.js b/components/wallet-buttonbar.js
index 2b807569..e07995f3 100644
--- a/components/wallet-buttonbar.js
+++ b/components/wallet-buttonbar.js
@@ -10,7 +10,7 @@ export default function WalletButtonBar ({
   return (
     <div className={`mt-3 ${className}`}>
       <div className='d-flex justify-content-between'>
-        {wallet.isConfigured &&
+        {wallet.hasConfig && wallet.isConfigured &&
           <Button onClick={onDelete} variant='grey-medium'>{deleteText}</Button>}
         {children}
         <div className='d-flex align-items-center ms-auto'>
diff --git a/pages/settings/wallets/[wallet].js b/pages/settings/wallets/[wallet].js
index 3b95edd8..41951359 100644
--- a/pages/settings/wallets/[wallet].js
+++ b/pages/settings/wallets/[wallet].js
@@ -10,6 +10,7 @@ import Info from '@/components/info'
 import Text from '@/components/text'
 import { AutowithdrawSettings } from '@/components/autowithdraw-shared'
 import dynamic from 'next/dynamic'
+import { useEffect, useState } from 'react'
 
 const WalletButtonBar = dynamic(() => import('@/components/wallet-buttonbar.js'), { ssr: false })
 
@@ -21,6 +22,14 @@ export default function WalletSettings () {
   const { wallet: name } = router.query
   const wallet = useWallet(name)
 
+  const [mounted, setMounted] = useState(false)
+  useEffect(() => {
+    // mounted is required since available might depend
+    // on values that are only available on the client (and not during SSR)
+    // and thus we need to render the component again on the client
+    setMounted(true)
+  }, [])
+
   const initial = wallet.fields.reduce((acc, field) => {
     // We still need to run over all wallet fields via reduce
     // even though we use wallet.config as the initial value
@@ -38,11 +47,13 @@ export default function WalletSettings () {
     ? { validate: wallet.fieldValidation }
     : { schema: wallet.fieldValidation }
 
+  const available = mounted && wallet.available !== undefined ? wallet.available : wallet.isConfigured
+
   return (
     <CenterLayout>
       <h2 className='pb-2'>{wallet.card.title}</h2>
       <h6 className='text-muted text-center pb-3'><Text>{wallet.card.subtitle}</Text></h6>
-      {!wallet.walletType && <WalletSecurityBanner />}
+      {!wallet.walletType && wallet.hasConfig > 0 && <WalletSecurityBanner />}
       <Form
         initial={initial}
         {...validateProps}
@@ -74,7 +85,7 @@ export default function WalletSettings () {
           ? <AutowithdrawSettings wallet={wallet} />
           : (
             <ClientCheckbox
-              disabled={!wallet.isConfigured}
+              disabled={!available}
               initialValue={wallet.status === Status.Enabled}
               label='enabled'
               name='enabled'
diff --git a/wallets/README.md b/wallets/README.md
index be6bc94c..3ce90013 100644
--- a/wallets/README.md
+++ b/wallets/README.md
@@ -64,6 +64,10 @@ Since `name` will also be used in [wallet logs](https://stacker.news/wallet/logs
 
 Wallet fields define what this wallet requires for configuration and thus are used to construct the forms like the one you can see at [/settings/wallets/lnbits](https://stacker.news/settings/walletslnbits).
 
+- `available?: boolean`
+
+This property can be used to override the default behavior of the `enabled` checkbox in the wallet configuration form. By default, it will be clickable when a wallet is configured. However, if a wallet does not have any configuration, this checkbox will always be disabled. You can set `available` to an expression that will determine when a wallet can be enabled.
+
 - `card: WalletCard`
 
 Wallet cards are the components you can see at [/settings/wallets](https://stacker.news/settings/wallets). This property customizes this card for this wallet.
diff --git a/wallets/client.js b/wallets/client.js
index 2cfffcec..891e54d9 100644
--- a/wallets/client.js
+++ b/wallets/client.js
@@ -4,5 +4,6 @@ import * as lnc from 'wallets/lnc/client'
 import * as lnAddr from 'wallets/lightning-address/client'
 import * as cln from 'wallets/cln/client'
 import * as lnd from 'wallets/lnd/client'
+import * as webln from 'wallets/webln/client'
 
-export default [nwc, lnbits, lnc, lnAddr, cln, lnd]
+export default [nwc, lnbits, lnc, lnAddr, cln, lnd, webln]
diff --git a/wallets/index.js b/wallets/index.js
index aadbd63a..69b365cf 100644
--- a/wallets/index.js
+++ b/wallets/index.js
@@ -29,6 +29,7 @@ export function useWallet (name) {
   const { logger, deleteLogs } = useWalletLogger(wallet)
 
   const [config, saveConfig, clearConfig] = useConfig(wallet)
+  const hasConfig = wallet?.fields.length > 0
   const _isConfigured = isConfigured({ ...wallet, config })
 
   const status = config?.enabled ? Status.Enabled : Status.Initialized
@@ -108,6 +109,7 @@ export function useWallet (name) {
     enable,
     disable,
     setPriority,
+    hasConfig,
     isConfigured: _isConfigured,
     status,
     enabled,
@@ -135,6 +137,11 @@ function useConfig (wallet) {
     ...(hasServerConfig ? serverConfig : {})
   }
 
+  if (wallet?.available !== undefined && config.enabled !== undefined) {
+    // wallet must be available to be enabled
+    config.enabled &&= wallet.available
+  }
+
   const saveConfig = useCallback(async (config) => {
     if (hasLocalConfig) setLocalConfig(config)
     if (hasServerConfig) await setServerConfig(config)
@@ -258,7 +265,13 @@ export function getEnabledWallet (me) {
       const priority = config?.priority
       return { ...def, config, priority }
     })
-    .filter(({ config }) => config?.enabled)
+    .filter(({ available, config }) => {
+      if (available !== undefined && config?.enabled !== undefined) {
+        // wallet must be available to be enabled
+        config.enabled &&= available
+      }
+      return config?.enabled
+    })
     .sort(walletPrioritySort)[0]
 }
 
diff --git a/wallets/webln/ATTACH.md b/wallets/webln/ATTACH.md
new file mode 100644
index 00000000..afb7b59d
--- /dev/null
+++ b/wallets/webln/ATTACH.md
@@ -0,0 +1,10 @@
+Using webln will require installing the alby browser extension and connecting it to an alby hub connected to `stacker_lnd`.
+
+1. Install the [Alby browser extensions](https://chromewebstore.google.com/detail/alby-bitcoin-wallet-for-l/iokeahhehimjnekafflcihljlcjccdbe?pli=1)
+2. Create an Alby account
+3. Install the [Alby hub](https://guides.getalby.com/user-guide/v/alby-account-and-browser-extension/alby-hub/alby-hub-other-flavors/desktop)
+4. Connect Alby Hub to our regest lnd:
+    - grpc host: `localhost:10010`
+    - hex admin.macaroon: `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`
+    - hex tls cert: `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`
+5. Connect Alby Hub to the alby extension in (2)
diff --git a/wallets/webln/client.js b/wallets/webln/client.js
new file mode 100644
index 00000000..da99bacd
--- /dev/null
+++ b/wallets/webln/client.js
@@ -0,0 +1,21 @@
+export * from 'wallets/webln'
+
+export const sendPayment = async (bolt11) => {
+  if (typeof window.webln === 'undefined') {
+    throw new Error('WebLN provider not found')
+  }
+
+  // this will prompt the user to unlock the wallet if it's locked
+  await window.webln.enable()
+
+  // this will prompt for payment if no budget is set
+  const response = await window.webln.sendPayment(bolt11)
+  if (!response) {
+    // sendPayment returns nothing if WebLN was enabled
+    // but browser extension that provides WebLN was then disabled
+    // without reloading the page
+    throw new Error('sendPayment returned no response')
+  }
+
+  return response.preimage
+}
diff --git a/wallets/webln/index.js b/wallets/webln/index.js
new file mode 100644
index 00000000..61990b06
--- /dev/null
+++ b/wallets/webln/index.js
@@ -0,0 +1,13 @@
+import { SSR } from '@/lib/constants'
+
+export const name = 'webln'
+
+export const fields = []
+
+export const available = SSR ? false : typeof window.webln !== 'undefined'
+
+export const card = {
+  title: 'WebLN',
+  subtitle: 'use a [WebLN provider](https://www.webln.guide/ressources/webln-providers) for payments',
+  badges: ['send only']
+}