Allow other controllers to access lndhub user balance

app/controllers/application_controller.rb

@@ -41,4 +41,26 @@ class ApplicationController < ActionController::Base
   def after_sign_in_path_for(user)
     session[:user_return_to] || root_path
   end
+
+  def lndhub_authenticate(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
+      @ln_auth_token = auth_token
+    end
+  rescue => e
+    Sentry.capture_exception(e) if Setting.sentry_enabled?
+  end
+
+  def lndhub_fetch_balance
+    @balance = LndhubManager::FetchUserBalance.call(auth_token: @ln_auth_token)
+  rescue AuthError
+    lndhub_authenticate(force_reauth: true)
+    raise if @fetch_balance_retried
+    @fetch_balance_retried = true
+    lndhub_fetch_balance
+  end
 end

app/controllers/services/lightning_controller.rb

@@ -2,10 +2,11 @@ require "rqrcode"
 require "lnurl"
 
 class Services::LightningController < ApplicationController
-  before_action :authenticate_user!
-  before_action :authenticate_with_lndhub
   before_action :set_current_section
-  before_action :fetch_balance
+  before_action :require_service_available
+  before_action :authenticate_user!
+  before_action :lndhub_authenticate
+  before_action :lndhub_fetch_balance
 
   def index
     @wallet_setup_url = "lndhub://#{current_user.ln_account}:#{current_user.ln_password}@#{ENV['LNDHUB_PUBLIC_URL']}"
@@ -55,32 +56,12 @@ class Services::LightningController < ApplicationController
 
   private
 
-  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
-      @ln_auth_token = auth_token
-    end
-  rescue => e
-    Sentry.capture_exception(e) if Setting.sentry_enabled?
-  end
-
   def set_current_section
     @current_section = :services
   end
 
-  def fetch_balance
-    lndhub = Lndhub.new
-    data = lndhub.balance @ln_auth_token
-    @balance = data["BTC"]["AvailableBalance"] rescue nil
-  rescue AuthError
-    authenticate_with_lndhub(force_reauth: true)
-    raise if @fetch_balance_retried
-    @fetch_balance_retried = true
-    fetch_balance
+  def require_service_available
+    http_status :not_found unless Setting.lndhub_enabled?
   end
 
   def fetch_transactions

app/services/lndhub_manager/fetch_user_balance.rb

@@ -0,0 +1,12 @@
+module LndhubManager
+  class FetchUserBalance < Lndhub
+    def initialize(auth_token:)
+      @auth_token = auth_token
+    end
+
+    def call
+      data = fetch_balance(auth_token)
+      data["BTC"]["AvailableBalance"] rescue nil
+    end
+  end
+end