Cast me

app/services/interview_files_collection_service.rb

@@ -0,0 +1,24 @@
+class InterviewFilesCollectionService
+  def initialize(files, folder_name)
+    @files = files
+    @folder_name = folder_name
+  end
+
+  def build
+    Dir.mktmpdir { |dir|
+      files.each do |file|
+        open("#{dir}/#{file.filename}", 'wb') do |tmp_file|
+          tmp_file << open(file.service_url.to_s).read
+        end
+      end
+
+      read_files = Dir.entries("#{dir}/").select { |f| !File.directory? f }
+      raise StandardError.new "Files not found." unless read_files.any?
+      yield(dir, read_files)
+    }
+  end
+
+  private
+
+  attr_reader :files, :folder_name
+end