[storage] correctly set content_length on save

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

@@ -98,6 +98,11 @@ module Fog
 
           data = connection.put_object(directory.key, @key, @body, options)
           merge_attributes(data.headers)
+          if body.is_a?(String)
+            self.content_length = body.size
+          else
+            self.content_length = ::File.size(body.path)
+          end
           true
         end
 

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

@@ -100,6 +100,11 @@ module Fog
 
           data = connection.put_object(directory.key, @key, @body, options)
           merge_attributes(data.headers)
+          if body.is_a?(String)
+            self.content_length = body.size
+          else
+            self.content_length = ::File.size(body.path)
+          end
           true
         end
 

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

@@ -52,6 +52,11 @@ module Fog
           requires :body, :directory, :key
           data = connection.put_object(directory.key, @key, @body, options)
           merge_attributes(data.headers)
+          if body.is_a?(String)
+            self.content_length = body.size
+          else
+            self.content_length = ::File.size(body.path)
+          end
           true
         end