Base64 Encode / Decode Script

controller.rb

def base64
  @data   = params[:data]
  @choice = params[:choice]
  if !["encode", "decode"].include?(@choice)
    render :action => 'base64'
  end
end

initializers.rb

require 'base64'

view.rb

<%= form_tag("/tools/base64", method: "post") do %>
  <%= label_tag(:input, "Data:") %><br>
  <% if @choice == "encode" %>
    <%= select_tag(:choice, options_for_select({'Encode' => 'encode', 'Decode' => 'decode'}, 'decode')) %><br>
    <%= text_area_tag(:data, Base64.encode64(@data)) %><br>

  <% elsif @choice == "decode" %>
    <%= select_tag(:choice, options_for_select({'Encode' => 'encode', 'Decode' => 'decode'}, 'encode')) %><br>
    <%= text_area_tag(:data, Base64.decode64(@data)) %><br>

  <% else %>
    <%= select_tag(:choice, options_for_select({'Encode' => 'encode', 'Decode' => 'decode'})) %><br>
    <%= text_area_tag(:data)%><br>
  <% end %>
<%= submit_tag("Convert") %>