1 files changed, 26 insertions, 0 deletions
diff --git a/lib/gitlab/webpack/dev_server_middleware.rb b/lib/gitlab/webpack/dev_server_middleware.rb
new file mode 100644
index 00000000000..b9a75eaac63
--- /dev/null
+++ b/lib/gitlab/webpack/dev_server_middleware.rb
@@ -0,0 +1,26 @@
+# This Rack middleware is intended to proxy the webpack assets directory to the
+# webpack-dev-server.  It is only intended for use in development.
+
+# :nocov:
+module Gitlab
+  module Webpack
+    class DevServerMiddleware < Rack::Proxy
+      def initialize(app = nil, opts = {})
+        @proxy_host = opts.fetch(:proxy_host, 'localhost')
+        @proxy_port = opts.fetch(:proxy_port, 3808)
+        @proxy_path = opts[:proxy_path] if opts[:proxy_path]
+
+        super(app, backend: "http://#{@proxy_host}:#{@proxy_port}", **opts)
+      end
+
+      def perform_request(env)
+        if @proxy_path && env['PATH_INFO'].start_with?("/#{@proxy_path}")
+          super(env)
+        else
+          @app.call(env)
+        end
+      end
+    end
+  end
+end
+# :nocov: