Password Protected Zip Using Ruby on Rails

This blog will guide you on how to create a Ruby on Rails application and add rubyzip which used to make zip files with Password Protection.

Let’s have a brief introduction about Password Protection using rubyzip. If you are familiar with rubyzip and Password Protection then directly go to Implementation section.

What is rubyzip ?

It’s a ruby gem (library) which is used to read and write zip files.
rubyzip provide you the power of reading and writing zip files and also make password protected zip files.

Why rubyzip?

rubyzip provides traditional password protection.

Requirements

Ruby 1.9.2 or greater

Technology Stack

Technology: Ruby on Rails
Versions: ruby 2.5.1p57 & rails 5.2.4
Git Repository: https://github.com/jigarshah8055/zipper

Implementation

Create a new rails app

rails new zipper --database=postgresql
Now put gem in the gemfile as

gem 'rubyzip', '>= 1.0.0'

Don’t forget to bundle ;)
Generate a controller with the create and new method

rails g controller zipping_folders new
Simply set the root path to zipping_folders new method and make resource path for only create method in routes.rb

resources :zipping_folders, only: [:create]
root ‘zipping_folders#new’

Now make a form in new.html.erb with one file tag to choose files and two input fields which define zip file name and password respectively.

	<h1>Welcome to Create Password Protected Zip</h1>

	<%= form_tag zipping_folders_path, method: :post, multipart: true do %>
	<%= label_tag 'Content', 'Select Files' %>
	<%= file_field_tag('files[]', multiple: true, class: 'drop-target') %>
	<%= label_tag 'Zip Name', 'Zip Name' %>
	<%= text_field_tag 'out_name' %>
	<%= label_tag 'Password', 'Password' %>
	<%= password_field_tag 'password' %>
	<%= submit_tag 'Generate!' %>
	<% end %>

You have to write below code in zipping_folders_controller.rb.

	require 'rubygems'
	require 'zip'
	class ZippingFoldersController < ApplicationController
	def new; end
	def create
	if params[:files].present?
	get_variables_for_zip(params)
	buffer = Zip::OutputStream.write_buffer(::StringIO.new(''), Zip::TraditionalEncrypter.new(@password)) do \|out\|
	@input_filenames.each do \|filename\|
	out.put_next_entry(filename)
	out.write File.open("#{@folder}/#{filename}").read
	end
	end

	File.open(@zipfile_name, 'wb') {\|f\| f.write(buffer.string) }
	buffer.rewind
	send_data buffer.read, filename: "#{@zipfile_name}.zip"
	end
	end

	private

	def get_variables_for_zip(params)
	@input_filenames = []
	params[:files].select {\|f\| @input_filenames << f.path.gsub('/tmp/', '') }
	@folder = "/tmp/"
	@zipfile_name = params[:out_name]
	@password = params[:password]
	end
	end