lib/concourse-resource/rubygems/in.rb in concourse-resource-rubygems-0.2.0 vs lib/concourse-resource/rubygems/in.rb in concourse-resource-rubygems-0.3.0

@@ -1,12 +1,25 @@
 require 'contracts'
 require 'concourse-fuselage'
 require 'concourse-resource/rubygems/core'
+require 'http'
 
 module ConcourseResource
   module RubyGems
     # In Step
     class In < Fuselage::In
       include Core
+
+      def filename
+        @filename ||= "#{gem}-#{version.fetch 'number'}.gem"
+      end
+
+      def download
+        @download ||= HTTP.get "https://#{host}/gems/#{filename}", follow: true
+      end
+
+      def fetch!
+        File.write "#{workdir}/#{filename}", download.flush
+      end
     end
   end
 end