[aws|storage] Added the ability to fetch a list of versions from a file.

lib/fog/aws/models/storage/file.rb

@@ -1,4 +1,5 @@
 require 'fog/core/model'
+require 'fog/aws/models/storage/versions'
 
 module Fog
   module Storage
@@ -132,6 +133,15 @@ module Fog
           collection.get_https_url(key, expires, options)
         end
 
+        def versions
+          @versions ||= begin
+            Fog::Storage::AWS::Versions.new(
+              :file         => self,
+              :connection   => connection
+            )
+          end
+        end
+
         private
 
         def directory=(new_directory)

lib/fog/aws/models/storage/version.rb

@@ -0,0 +1,24 @@
+require 'fog/core/model'
+
+module Fog
+  module Storage
+    class AWS
+
+      class Version < Fog::Model
+
+        identity  :version,             :aliases => 'VersionId'
+
+        attribute :key,                 :aliases => 'Key'
+        attribute :last_modified,       :aliases => ['Last-Modified', 'LastModified']
+        attribute :latest,              :aliases => 'IsLatest', :type => :boolean
+        attribute :content_length,      :aliases => ['Content-Length', 'Size'], :type => :integer
+        attribute :delete_marker,       :type => :boolean
+
+        def file
+          @file ||= collection.file.directory.files.get(key, 'versionId' => version)
+        end
+      end
+
+    end
+  end
+end

lib/fog/aws/models/storage/versions.rb

@@ -0,0 +1,34 @@
+require 'fog/core/collection'
+require 'fog/aws/models/storage/version'
+
+module Fog
+  module Storage
+    class AWS
+
+      class Versions < Fog::Collection
+
+        attribute :file
+
+        model Fog::Storage::AWS::Version
+
+        def all
+          data = connection.get_bucket_object_versions(file.directory.key, :prefix => file.key).body['Versions']
+          load(data)
+        end
+
+        def new(attributes = {})
+          requires :file
+
+          version_type = attributes.keys.first
+
+          model = super({ :file => file }.merge!(attributes[version_type]))
+          model.delete_marker = version_type == 'DeleteMarker'
+
+          model
+        end
+
+      end
+
+    end
+  end
+end