Add skeleton Pages internal API61927-skeleton-pages-internal-api

Basic `/internal/pages` endpoint that will be used for Pages virtual
domains internal API. The endpoint is currently behind feature flag and
provides authetication similar to how Workhorse is authenticating with
the GitLab.

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/api/internal/pages.rb b/lib/api/internal/pages.rb
new file mode 100644
index 00000000000..6ea048bde03
--- /dev/null
+++ b/lib/api/internal/pages.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module API
+  # Pages Internal API
+  module Internal
+    class Pages < Grape::API
+      before do
+        not_found! unless Feature.enabled?(:pages_internal_api)
+        authenticate_gitlab_pages_request!
+      end
+
+      helpers do
+        def authenticate_gitlab_pages_request!
+          unauthorized! unless Gitlab::Pages.verify_api_request(headers)
+        end
+      end
+
+      namespace 'internal' do
+        namespace 'pages' do
+          get "/" do
+            status :ok
+          end
+        end
+      end
+    end
+  end
+end