chore: ability to run Chatwoot as API only server (#2344)

- Ability to run chatwoot as an API only server
- Removes action cable testing gem since it is merged to rails 6

config/environments/development.rb

@@ -76,4 +76,13 @@ Rails.application.configure do
     Bullet.bullet_logger = true
     Bullet.rails_logger = true
   end
+
+  # ref: https://github.com/cyu/rack-cors
+  config.middleware.insert_before 0, Rack::Cors do
+    allow do
+      origins '*'
+      resource '/packs/*', headers: :any, methods: [:get, :options]
+      resource '*', headers: :any, methods: :any, expose: ['access-token', 'client', 'uid', 'expiry']
+    end
+  end
 end

config/environments/production.rb

@@ -110,10 +110,14 @@ Rails.application.configure do
 
   # font cors issue with CDN
   # Ref: https://stackoverflow.com/questions/56960709/rails-font-cors-policy
+  # ref: https://github.com/cyu/rack-cors
   config.middleware.insert_before 0, Rack::Cors do
     allow do
       origins '*'
       resource '/packs/*', headers: :any, methods: [:get, :options]
+      if ActiveModel::Type::Boolean.new.cast(ENV.fetch('CW_API_ONLY_SERVER', false))
+        resource '*', headers: :any, methods: :any, expose: ['access-token', 'client', 'uid', 'expiry']
+      end
     end
   end
 end

config/routes.rb

@@ -8,14 +8,19 @@ Rails.application.routes.draw do
     token_validations: 'devise_overrides/token_validations'
   }, via: [:get, :post]
 
-  root to: 'dashboard#index'
+  ## renders the frontend paths only if its not an api only server
+  if ActiveModel::Type::Boolean.new.cast(ENV.fetch('CW_API_ONLY_SERVER', false))
+    root to: 'api#index'
+  else
+    root to: 'dashboard#index'
 
-  get '/app', to: 'dashboard#index'
-  get '/app/*params', to: 'dashboard#index'
-  get '/app/accounts/:account_id/settings/inboxes/new/twitter', to: 'dashboard#index', as: 'app_new_twitter_inbox'
-  get '/app/accounts/:account_id/settings/inboxes/new/:inbox_id/agents', to: 'dashboard#index', as: 'app_twitter_inbox_agents'
+    get '/app', to: 'dashboard#index'
+    get '/app/*params', to: 'dashboard#index'
+    get '/app/accounts/:account_id/settings/inboxes/new/twitter', to: 'dashboard#index', as: 'app_new_twitter_inbox'
+    get '/app/accounts/:account_id/settings/inboxes/new/:inbox_id/agents', to: 'dashboard#index', as: 'app_twitter_inbox_agents'
 
-  resource :widget, only: [:show]
+    resource :widget, only: [:show]
+  end
 
   get '/api', to: 'api#index'
   namespace :api, defaults: { format: 'json' } do