Files controller handle redirect to remote storage. Added config block to carrierwave init

app/controllers/files_controller.rb

 class FilesController < ApplicationController
   def download
     note = Note.find(params[:id])
+    uploader = note.attachment
 
+    if uploader.file_storage?
       if can?(current_user, :read_project, note.project)
-      uploader = note.attachment
         send_file uploader.file.path, disposition: 'attachment'
       else
         not_found!
       end
+    else
+      redirect_to uploader.url
+    end
   end
 end
 

app/uploaders/attachment_uploader.rb

@@ -21,10 +21,10 @@ class AttachmentUploader < CarrierWave::Uploader::Base
   end
 
   def secure_url
-    if self.class.storage == CarrierWave::Storage::File
     "/files/#{model.class.to_s.underscore}/#{model.id}/#{file.filename}"
-    else
-      url
   end
+
+  def file_storage?
+    self.class.storage == CarrierWave::Storage::File
   end
 end

config/initializers/carrierwave.rb

@@ -5,6 +5,7 @@ aws_file = Rails.root.join('config', 'aws.yml')
 if File.exists?(aws_file)
   AWS_CONFIG = YAML.load(File.read(aws_file))[Rails.env]
 
+  CarrierWave.configure do |config|
     config.fog_credentials = {
       provider: 'AWS',                                        # required
       aws_access_key_id: AWS_CONFIG['access_key_id'],         # required
@@ -14,4 +15,5 @@ if File.exists?(aws_file)
     config.fog_directory  = AWS_CONFIG['bucket']                    # required
     config.fog_public     = false                                   # optional, defaults to true
     config.fog_attributes = {'Cache-Control'=>'max-age=315576000'}  # optional, defaults to {}
+  end
 end