Added EmailsDownload controller and routes

Removed original method to return emails file from Newsletters controller and NewsletterZip class, included `rubyzip` gem that's no longer necessary.

Gemfile

@@ -41,7 +41,6 @@ gem 'redcarpet', '~> 3.4.0'
 gem 'responders', '~> 2.4.0'
 gem 'rinku', '~> 2.0.2', require: 'rails_rinku'
 gem 'rollbar', '~> 2.15.5'
-gem 'rubyzip', '~> 1.2.0'
 gem 'sass-rails', '~> 5.0', '>= 5.0.4'
 gem 'savon', '~> 2.11.1'
 gem 'sitemap_generator', '~> 6.0.1'

app/controllers/admin/emails_download_controller.rb

@@ -0,0 +1,18 @@
+class Admin::EmailsDownloadController < Admin::BaseController
+  def index
+  end
+
+  def generate_csv
+    users_segment = params[:users_segment]
+    filename = t("admin.segment_recipient.#{users_segment}")
+
+    csv_file = users_segment_emails_csv(users_segment)
+    send_data csv_file, filename: "#{filename}.csv"
+  end
+
+  private
+
+  def users_segment_emails_csv(users_segment)
+    UserSegments.send(users_segment).pluck(:email).to_csv
+  end
+end

app/controllers/admin/newsletters_controller.rb

@@ -44,12 +44,6 @@ class Admin::NewslettersController < Admin::BaseController
     redirect_to admin_newsletters_path, notice: t("admin.newsletters.delete_success")
   end
 
-  def users
-    zip = NewsletterZip.new('emails')
-    zip.create
-    send_file(File.join(zip.path), type: 'application/zip')
-  end
-
   def deliver
     @newsletter = Newsletter.find(params[:id])
     Mailer.newsletter(@newsletter).deliver_later

config/routes/admin.rb

@@ -149,6 +149,10 @@ namespace :admin do
     get :users, on: :collection
   end
 
+  resources :emails_download, only: :index do
+    get :generate_csv, on: :collection
+  end
+
   resource :stats, only: :show do
     get :proposal_notifications, on: :collection
     get :direct_messages, on: :collection

lib/newsletter_zip.rb

@@ -1,25 +0,0 @@
-require 'zip'
-class NewsletterZip
-  attr_accessor :filename
-
-  def initialize(filename)
-    @filename = filename
-  end
-
-  def emails
-    User.newsletter.pluck(:email).join("\n")
-  end
-
-  def path
-    Rails.root + "/tmp/#{filename}.zip"
-  end
-
-  def create
-    Zip::File.open(path, Zip::File::CREATE) do |zipfile|
-      zipfile.get_output_stream("#{filename}.txt") do |file|
-        file.write emails
-      end
-    end
-  end
-
-end