Add early support of auth middleware

cmd/gate/app-new-auth.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/gorilla/mux"
+	s3auth "github.com/minio/minio/auth"
+	"go.uber.org/zap"
+)
+
+func attachNewUserAuth(router *mux.Router, center *s3auth.Center, log *zap.Logger) {
+	uamw := func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			_, err := center.AuthenticationPassed(r.Header)
+			if err != nil {
+				log.Error("failed to pass authentication", zap.Error(err))
+			}
+			// TODO: Handle any auth error by rejecting request.
+			h.ServeHTTP(w, r)
+
+		})
+	}
+	router.Use(uamw)
+}