Merge pull request #53766 from liggitt/ui-redirect

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove /ui/ redirect

The existing kube-apiserver hard-codes `/ui` to redirect to an optional add-on, which is not appropriate. It does not work in the following scenarios:
* https-enabled dashboards
* the dashboard is deployed to a different namespace or service name
* the dashboard is not installed at all
* authorization is enabled and does not allow access to /ui

This PR removes the hard-coded `/ui` redirect.

```release-note
apiserver: the /ui kube-dashboard redirect has been removed. Follow instructions specific to your deployment to access kube-dashboard
```

pkg/master/master.go

@@ -109,7 +109,6 @@ type ExtraConfig struct {
 
 	// Used to start and monitor tunneling
 	Tunneler          tunneler.Tunneler
-	EnableUISupport   bool
 	EnableLogsSupport bool
 	ProxyTransport    http.RoundTripper
 
@@ -269,9 +268,6 @@ func (cfg *Config) Complete(informers informers.SharedInformerFactory) Completed
 		glog.Infof("Node port range unspecified. Defaulting to %v.", c.ExtraConfig.ServiceNodePortRange)
 	}
 
-	// enable swagger UI only if general UI support is on
-	c.GenericConfig.EnableSwaggerUI = c.GenericConfig.EnableSwaggerUI && c.ExtraConfig.EnableUISupport
-
 	if c.ExtraConfig.EndpointReconcilerConfig.Interval == 0 {
 		c.ExtraConfig.EndpointReconcilerConfig.Interval = DefaultEndpointReconcilerInterval
 	}
@@ -304,9 +300,6 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 		return nil, err
 	}
 
-	if c.ExtraConfig.EnableUISupport {
-		routes.UIRedirect{}.Install(s.Handler.NonGoRestfulMux)
-	}
 	if c.ExtraConfig.EnableLogsSupport {
 		routes.Logs{}.Install(s.Handler.GoRestfulContainer)
 	}

pkg/routes/BUILD

@@ -10,13 +10,9 @@ go_library(
     srcs = [
         "doc.go",
         "logs.go",
-        "ui.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/routes",
-    deps = [
-        "//vendor/github.com/emicklei/go-restful:go_default_library",
-        "//vendor/k8s.io/apiserver/pkg/server/mux:go_default_library",
-    ],
+    deps = ["//vendor/github.com/emicklei/go-restful:go_default_library"],
 )
 
 filegroup(

pkg/routes/ui.go

@@ -1,36 +0,0 @@
-/*
-Copyright 2014 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package routes
-
-import (
-	"net/http"
-
-	"k8s.io/apiserver/pkg/server/mux"
-)
-
-const dashboardPath = "/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/"
-
-// UIRedirect redirects /ui to the kube-ui proxy path.
-type UIRedirect struct{}
-
-func (r UIRedirect) Install(c *mux.PathRecorderMux) {
-	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		http.Redirect(w, r, dashboardPath, http.StatusTemporaryRedirect)
-	})
-	c.Handle("/ui", handler)
-	c.HandlePrefix("/ui/", handler)
-}