Re-authorize when token is invalid

app/controllers/wallet_controller.rb

@@ -28,13 +28,13 @@ class WalletController < ApplicationController
 
   private
 
-  def authenticate_with_lndhub
-    if session["ln_auth_token"].present?
-      @ln_auth_token = session["ln_auth_token"]
+  def authenticate_with_lndhub(options={})
+    if session[:ln_auth_token].present? && !options[:force_reauth]
+      @ln_auth_token = session[:ln_auth_token]
     else
       lndhub = Lndhub.new
       auth_token = lndhub.authenticate(current_user)
-      session["ln_auth_token"] = auth_token
+      session[:ln_auth_token] = auth_token
       @ln_auth_token = auth_token
     end
   rescue
@@ -49,14 +49,23 @@ class WalletController < ApplicationController
     lndhub = Lndhub.new
     data = lndhub.balance @ln_auth_token
     @balance = data["BTC"]["AvailableBalance"] rescue nil
+  rescue
+    authenticate_with_lndhub(force_reauth: true)
+    return nil if @fetch_balance_retried
+    @fetch_balance_retried = true
+    fetch_balance
   end
 
   def fetch_transactions
     lndhub = Lndhub.new
     txs = lndhub.gettxs @ln_auth_token
     invoices = lndhub.getuserinvoices(@ln_auth_token).select{|i| i["ispaid"]}
-
     process_transactions(txs + invoices)
+  rescue
+    authenticate_with_lndhub(force_reauth: true)
+    return [] if @fetch_transactions_retried
+    @fetch_transactions_retried = true
+    fetch_transactions
   end
 
   def process_transactions(txs)

app/services/lndhub.rb

@@ -28,8 +28,13 @@ class Lndhub
       "Accept" => "application/json",
       "Authorization" => "Bearer #{auth_token}"
     })
+    data = JSON.parse(res.body)
 
-    JSON.parse(res.body)
+    if data.is_a?(Hash) && data["error"] && data["message"] == "bad auth"
+      raise "BAD_AUTH"
+    else
+      data
+    end
   end
 
   def create(payload)