auth: add support for macaroons

Previously, the app was running lnd with the —no-macaroons option. This
commit adds the ability for the app to send macaroons to lnd with each
gRPC call.

Author: bryanvu

apps/desktop/main.dev.js

@@ -71,7 +71,6 @@ const processes = [
       isDev ? '' : '--neutrino.connect=127.0.0.1:18333',
       isDev ? '' : '--debuglevel=info',
       isDev ? '' : '--autopilot.active',
-      '--no-macaroons',
       '--noencryptwallet',
     ],
   },
@@ -81,17 +80,21 @@ runProcesses(processes, logs)
 
 let intervalId
 let certPath
+let macaroonPath
 const homedir = os.homedir()
 
 switch (os.platform()) {
   case 'darwin':
     certPath = path.join(homedir, 'Library/Application\ Support/Lnd/tls.cert')
+    macaroonPath = path.join(homedir, 'Library/Application\ Support/Lnd/admin.macaroon')
     break
   case 'linux':
     certPath = path.join(homedir, '.lnd/tls.cert')
+    macaroonPath = path.join(homedir, '.lnd/admin.macaroon')
     break
   case 'win32':
     certPath = path.join(homedir, 'AppData', 'Local', 'Lnd', 'tls.cert')
+    macaroonPath = path.join(homedir, 'AppData', 'Local', 'Lnd', 'admin.macaroon')
     break
   default:
     break
@@ -190,9 +193,13 @@ const createWindow = () => {
       const credentials = grpc.credentials.createSsl(lndCert)
       const { lnrpc } = grpc.load(path.join(__dirname, 'rpc.proto'))
       const connection = new lnrpc.Lightning('localhost:10009', credentials)
+      let metadata = new grpc.Metadata()
+      const macaroonHex = fs.readFileSync(macaroonPath).toString("hex")
+      metadata.add('macaroon', macaroonHex)
       const serverReady = cb =>
        grpc.waitForClientReady(connection, Infinity, cb)
       global.connection = connection
+      global.metadata = metadata
       global.serverReady = serverReady
       finishCreateWindow()
     }

packages/redux-grpc-middleware/index.js

@@ -6,6 +6,7 @@ import { remote } from 'electron'
 const defaults = {
   global: {
     connection: 'connection',
+    metadata: 'metadata',
     serverReady: 'serverReady',
   },
   selector: 'default',
@@ -18,6 +19,7 @@ export const SERVER_RUNNING = 'GRPC/SERVER_RUNNING'
 export default (opts = {}) => {
   const options = { ...defaults, ...opts }
   const serverReady = remote.getGlobal(options.global.serverReady)
+  const metadata = remote.getGlobal(options.global.metadata)
 
   let client
   let ready = false
@@ -67,7 +69,11 @@ export default (opts = {}) => {
       if (client[method]) {
         let streamCall
         try {
-          streamCall = client[method](body ? { body } : params)
+          if (method === "sendPayment") {
+              streamCall = client[method](metadata, { body })
+          } else {
+              streamCall = client[method](params, metadata)
+          }
         } catch (err) {
           console.log('Error From Stream Method', method, err)
         } finally {
@@ -83,7 +89,8 @@ export default (opts = {}) => {
 
     return new Promise((resolve, reject) => {
       try {
-        client[method] && client[method](body, { deadline }, (error, res) => {
+        client[method] && client[method](body, metadata, { deadline }, 
+            (error, res) => {
           if (error) {
             ERROR && next({ type: ERROR, error })
             reject({ ...error })