use local disk for bulk upload for dev env

- this saves the need to connect to S3 to play with bulk upload in dev
  environment

app/models/forms/bulk_upload_lettings/upload_your_file.rb

@@ -41,9 +41,7 @@ module Forms
           filename: file.original_filename,
         )
 
-        if upload_enabled?
-          storage_service.write_file(bulk_upload.identifier, File.read(file.path))
-        end
+        storage_service.write_file(bulk_upload.identifier, File.read(file.path))
 
         true
       end
@@ -55,7 +53,14 @@ module Forms
       end
 
       def storage_service
-        @storage_service ||= Storage::S3Service.new(Configuration::PaasConfigurationService.new, ENV["CSV_DOWNLOAD_PAAS_INSTANCE"])
+        @storage_service ||= if upload_enabled?
+                               Storage::S3Service.new(
+                                 Configuration::PaasConfigurationService.new,
+                                 ENV["CSV_DOWNLOAD_PAAS_INSTANCE"],
+                               )
+                             else
+                               Storage::LocalDiskService.new
+                             end
       end
 
       def validate_file_is_csv

app/services/bulk_upload/downloader.rb

@@ -25,9 +25,21 @@ private
   end
 
   def storage_service
-    @storage_service ||= Storage::S3Service.new(
+    @storage_service ||= if FeatureToggle.upload_enabled?
+                           s3_storage_service
+                         else
+                           local_disk_storage_service
+                         end
+  end
+
+  def s3_storage_service
+    Storage::S3Service.new(
       Configuration::PaasConfigurationService.new,
       ENV["CSV_DOWNLOAD_PAAS_INSTANCE"],
     )
   end
+
+  def local_disk_storage_service
+    Storage::LocalDiskService.new
+  end
 end

app/services/storage/local_disk_service.rb

@@ -0,0 +1,26 @@
+require "fileutils"
+
+module Storage
+  class LocalDiskService < StorageService
+    def list_files(folder = "/")
+      path = Rails.root.join("tmp/storage", folder)
+      Dir.entries(path)
+    end
+
+    def get_file_io(filename)
+      path = Rails.root.join("tmp/storage", filename)
+
+      File.open(path, "r")
+    end
+
+    def write_file(filename, data)
+      path = Rails.root.join("tmp/storage", filename)
+
+      FileUtils.mkdir_p(path.dirname)
+
+      File.open(path, "w") do |f|
+        f.write data
+      end
+    end
+  end
+end