implements the public_url feature for openstack storage

lib/fog/openstack/models/storage/directory.rb

@@ -9,7 +9,7 @@ module Fog
 
         attribute :bytes, :aliases => 'X-Container-Bytes-Used'
         attribute :count, :aliases => 'X-Container-Object-Count'
-        
+
         attr_writer :public
 
         def destroy
@@ -30,7 +30,15 @@ module Fog
         end
 
         def public_url
-          raise NotImplementedError
+          requires :key
+          @public_url ||= begin
+            begin response = service.head_container(key)
+              # escape the key to cover for special char. in container names
+              url = service.public_url(key)
+            rescue Fog::Storage::OpenStack::NotFound => err
+              nil
+            end
+          end
         end
 
         def save

lib/fog/openstack/requests/storage/public_url.rb

@@ -0,0 +1,32 @@
+module Fog
+  module Storage
+    class OpenStack
+      class Real
+
+        def url
+          "#{@scheme}://#{@host}:#{@port}#{@path}"
+        end
+
+        # Get public_url for an object
+        #
+        # ==== Parameters
+        # * container<~String> - Name of container to look in
+        # * object<~String> - Name of object to look for
+        #
+        def public_url(container=nil, object=nil)
+          public_url = nil
+          unless container.nil?
+            if object.nil?
+              # return container public url
+              public_url = "#{url}/#{Fog::OpenStack.escape(container)}"
+            else
+              # return object public url
+              public_url = "#{url}/#{Fog::OpenStack.escape(container)}/#{Fog::OpenStack.escape(object)}"
+            end
+          end
+          public_url
+        end
+      end
+    end
+  end
+end

lib/fog/openstack/storage.rb

@@ -36,6 +36,7 @@ module Fog
       request :put_dynamic_obj_manifest
       request :put_static_obj_manifest
       request :post_set_meta_temp_url_key
+      request :public_url
 
       class Mock
         def self.data