Adding download buttons to invoice (orders#show)

app/overrides/add_digital_downloads_to_invoice.rb

@@ -0,0 +1,14 @@
+Deface::Override.new(:virtual_path => "spree/shared/_order_details",
+                     :name => "add_digital_downloads_to_invoice",
+                     :insert_bottom => "td[data-hook='order_item_description']",
+                     :text => %q{
+<% if order.state == 'complete' and item.variant.digital? %>
+  <%= content_tag(:p, :class => 'download_links') do %>
+    <% item.digital_links.each do |digital_link| %>
+    <% format = File.extname(digital_link.digital.attachment.path).downcase %>
+      <%= link_to t(:digital_download, :type => t("digital_format#{format}")), digital_url(:host => Spree::Config.get(:site_url), :secret => digital_link.secret), :class => "btn #{format}" %>
+    <% end %>
+  <% end %>
+<% end %>
+                      },
+                     :disabled => false)

config/locales/en.yml

@@ -6,5 +6,10 @@ en:
   broken_file: Warning! this file is broken
   delete_file_cofirmation: Are you sure you want to delete the file %{filename}?
   digital_delivery: Digital Delivery
+  digital_download: Download %{type} ↓
+  digital_format:
+    mp3: Audio MP3
+    mobi: Kindle eBook
+    epub: ePub eBook
   spree_digital:
     upload: Upload