proper linux and win cert handling

app/lnd/config/index.js

@@ -2,10 +2,26 @@
 // Mac OS X: /Users/user/Library/Application Support/Lnd/tls.cert
 // Linux: ~/.lnd/tls.cert
 // Windows: TODO find out where cert is located for windows machine
-import { userInfo } from 'os'
+import { userInfo, platform } from 'os'
+import { join } from 'path'
+
+let loc
+switch (platform()) {
+  case 'darwin':
+    loc = 'Library/Application\ Support/Lnd/tls.cert'
+    break
+  case 'linux':
+    loc = '.lnd/tls.cert'
+    break
+  case 'win32':
+    loc = join('Appdata', 'Local', 'Lnd', 'tls.cert')
+    break
+  default:
+    break
+}
 
 export default {
   lightningRpc: `${__dirname}/rpc.proto`,
   lightningHost: 'localhost:10009',
-  cert: `/Users/${userInfo().username}/Library/Application Support/Lnd/tls.cert`
+  cert: join(userInfo().homedir, loc)
 }