Create system banner API handler

build/conf.js

@@ -164,6 +164,16 @@ export default {
      * Directory path containing certificate files. Matches dashboard '--default-cert-dir' flag.
      */
     defaultCertDir: gulpUtil.env.defaultCertDir !== undefined ? gulpUtil.env.defaultCertDir : '',
+    /**
+     * System banner message. Matches dashboard '--system-banner' flag.
+     */
+    systemBanner: gulpUtil.env.systemBanner !== undefined ? gulpUtil.env.systemBanner : '',
+    /**
+     * System banner severity. Matches dashboard '--system-banner-severity' flag.
+     */
+    systemBannerSeverity: gulpUtil.env.systemBannerSeverity !== undefined ?
+        gulpUtil.env.systemBannerSeverity :
+        '',
   },
 
   /**

build/serve.js

@@ -49,6 +49,14 @@ function getBackendArgs(mode) {
     `--auto-generate-certificates=${conf.backend.autoGenerateCerts}`,
   ];
 
+  if (conf.backend.systemBanner.length > 0) {
+    args.push(`--system-banner=${conf.backend.systemBanner}`);
+  }
+
+  if (conf.backend.systemBannerSeverity.length > 0) {
+    args.push(`--system-banner-severity=${conf.backend.systemBannerSeverity}`);
+  }
+
   if (conf.backend.defaultCertDir.length > 0) {
     args.push(`--default-cert-dir=${conf.backend.defaultCertDir}`);
   }

src/app/backend/dashboard.go

@@ -35,6 +35,7 @@ import (
 	integrationapi "github.com/kubernetes/dashboard/src/app/backend/integration/api"
 	"github.com/kubernetes/dashboard/src/app/backend/settings"
 	"github.com/kubernetes/dashboard/src/app/backend/sync"
+	"github.com/kubernetes/dashboard/src/app/backend/systembanner"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/spf13/pflag"
 )
@@ -62,6 +63,8 @@ var (
 	argMetricClientCheckPeriod  = pflag.Int("metric-client-check-period", 30, "Time in seconds that defines how often configured metric client health check should be run. Default: 30 seconds.")
 	argAutoGenerateCertificates = pflag.Bool("auto-generate-certificates", false, "When set to true, Dashboard will automatically generate certificates used to serve HTTPS. Default: false.")
 	argEnableInsecureLogin      = pflag.Bool("enable-insecure-login", false, "When enabled, Dashboard login view will also be shown when Dashboard is not served over HTTPS. Default: false.")
+	argSystemBanner             = pflag.String("system-banner", "", "When non-empty displays message to Dashboard users. Accepts simple HTML tags. Default: ''.")
+	argSystemBannerSeverity     = pflag.String("system-banner-severity", "INFO", "Severity of system banner. Should be one of 'INFO|WARNING|ERROR'. Default: 'INFO'.")
 )
 
 func main() {
@@ -93,6 +96,9 @@ func main() {
 	// Init settings manager
 	settingsManager := settings.NewSettingsManager(clientManager)
 
+	// Init system banner manager
+	systemBannerManager := systembanner.NewSystemBannerManager(*argSystemBanner, *argSystemBannerSeverity)
+
 	// Init integrations
 	integrationManager := integration.NewIntegrationManager(clientManager)
 	integrationManager.Metric().ConfigureHeapster(*argHeapsterHost).
@@ -103,7 +109,8 @@ func main() {
 		clientManager,
 		authManager,
 		*argEnableInsecureLogin,
-		settingsManager)
+		settingsManager,
+		systemBannerManager)
 	if err != nil {
 		handleFatalInitError(err)
 	}

src/app/backend/handler/apihandler.go

@@ -62,6 +62,7 @@ import (
 	"github.com/kubernetes/dashboard/src/app/backend/scaling"
 	"github.com/kubernetes/dashboard/src/app/backend/search"
 	"github.com/kubernetes/dashboard/src/app/backend/settings"
+	"github.com/kubernetes/dashboard/src/app/backend/systembanner"
 	"github.com/kubernetes/dashboard/src/app/backend/validation"
 	"golang.org/x/net/xsrftoken"
 	errorsK8s "k8s.io/apimachinery/pkg/api/errors"
@@ -92,7 +93,9 @@ type TerminalResponse struct {
 
 // CreateHTTPAPIHandler creates a new HTTP handler that handles all requests to the API of the backend.
 func CreateHTTPAPIHandler(iManager integration.IntegrationManager, cManager client.ClientManager,
-	authManager authApi.AuthManager, enableInsecureLogin bool, sManager settings.SettingsManager) (
+	authManager authApi.AuthManager, enableInsecureLogin bool, sManager settings.SettingsManager,
+	sbManager systembanner.SystemBannerManager) (
+
 	http.Handler, error) {
 	apiHandler := APIHandler{iManager: iManager, cManager: cManager}
 	wsContainer := restful.NewContainer()
@@ -116,6 +119,9 @@ func CreateHTTPAPIHandler(iManager integration.IntegrationManager, cManager clie
 	settingsHandler := settings.NewSettingsHandler(sManager)
 	settingsHandler.Install(apiV1Ws)
 
+	systemBannerHandler := systembanner.NewSystemBannerHandler(sbManager)
+	systemBannerHandler.Install(apiV1Ws)
+
 	apiV1Ws.Route(
 		apiV1Ws.GET("csrftoken/{action}").
 			To(apiHandler.handleGetCsrfToken).

src/app/backend/handler/apihandler_test.go

@@ -29,6 +29,7 @@ import (
 	"github.com/kubernetes/dashboard/src/app/backend/client"
 	"github.com/kubernetes/dashboard/src/app/backend/settings"
 	"github.com/kubernetes/dashboard/src/app/backend/sync"
+	"github.com/kubernetes/dashboard/src/app/backend/systembanner"
 	"k8s.io/client-go/kubernetes/fake"
 )
 
@@ -43,7 +44,8 @@ func TestCreateHTTPAPIHandler(t *testing.T) {
 	cManager := client.NewClientManager("", "http://localhost:8080")
 	authManager := auth.NewAuthManager(cManager, getTokenManager(), authApi.AuthenticationModes{})
 	sManager := settings.NewSettingsManager(cManager)
-	_, err := CreateHTTPAPIHandler(nil, cManager, authManager, false, sManager)
+	sbManager := systembanner.NewSystemBannerManager("Hello world!", "INFO")
+	_, err := CreateHTTPAPIHandler(nil, cManager, authManager, false, sManager, sbManager)
 	if err != nil {
 		t.Fatal("CreateHTTPAPIHandler() cannot create HTTP API handler")
 	}

src/app/backend/systembanner/api/types.go

@@ -0,0 +1,53 @@
+// Copyright 2017 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 api
+
+// SystemBannerManager is used for user system banner management.
+type SystemBannerManager interface {
+	// Get system banner.
+	Get() *SystemBanner
+}
+
+// SystemBanner represents system banner.
+type SystemBanner struct {
+	Message  string               `json:"message"`
+	Severity SystemBannerSeverity `json:"severity"`
+}
+
+// SystemBannerSeverity represents severity of system banner.
+type SystemBannerSeverity string
+
+const (
+	// SystemBannerSeverityInfo is the lowest of allowed system banner severities.
+	SystemBannerSeverityInfo SystemBannerSeverity = "INFO"
+
+	// SystemBannerSeverityInfo is in the middle of allowed system banner severities.
+	SystemBannerSeverityWarning SystemBannerSeverity = "WARNING"
+
+	// SystemBannerSeverityInfo is the highest of allowed system banner severities.
+	SystemBannerSeverityError SystemBannerSeverity = "ERROR"
+)
+
+// GetSeverity returns one of allowed severity values based on given parameter.
+func GetSeverity(severity string) SystemBannerSeverity {
+	switch severity {
+	case string(SystemBannerSeverityWarning):
+		return SystemBannerSeverityWarning
+	case string(SystemBannerSeverityError):
+		return SystemBannerSeverityError
+	default:
+		return SystemBannerSeverityInfo
+	}
+}

src/app/backend/systembanner/handler.go

@@ -0,0 +1,58 @@
+// Copyright 2017 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 systembanner
+
+import (
+	"log"
+	"net/http"
+
+	restful "github.com/emicklei/go-restful"
+	"github.com/kubernetes/dashboard/src/app/backend/systembanner/api"
+	"k8s.io/apimachinery/pkg/api/errors"
+)
+
+// SystemBannerHandler manages all endpoints related to system banner management.
+type SystemBannerHandler struct {
+	manager SystemBannerManager
+}
+
+// Install creates new endpoints for system banner management.
+func (self *SystemBannerHandler) Install(ws *restful.WebService) {
+	ws.Route(
+		ws.GET("/systembanner").
+			To(self.handleGet).
+			Writes(api.SystemBanner{}))
+}
+
+func (self *SystemBannerHandler) handleGet(request *restful.Request, response *restful.Response) {
+	response.WriteHeaderAndEntity(http.StatusOK, self.manager.Get())
+}
+
+// handleInternalError writes the given error to the response and sets appropriate HTTP status headers.
+func handleInternalError(response *restful.Response, err error) {
+	log.Print(err)
+	statusCode := http.StatusInternalServerError
+	statusError, ok := err.(*errors.StatusError)
+	if ok && statusError.Status().Code > 0 {
+		statusCode = int(statusError.Status().Code)
+	}
+	response.AddHeader("Content-Type", "text/plain")
+	response.WriteErrorString(statusCode, err.Error()+"\n")
+}
+
+// NewSystemBannerHandler creates SystemBannerHandler.
+func NewSystemBannerHandler(manager SystemBannerManager) SystemBannerHandler {
+	return SystemBannerHandler{manager: manager}
+}

src/app/backend/systembanner/manager.go

@@ -0,0 +1,39 @@
+// Copyright 2017 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 systembanner
+
+import (
+	"github.com/kubernetes/dashboard/src/app/backend/systembanner/api"
+)
+
+// SystemBannerManager is a structure containing all system banner manager members.
+type SystemBannerManager struct {
+	systemBanner api.SystemBanner
+}
+
+// NewSystemBannerManager creates new settings manager.
+func NewSystemBannerManager(message, severity string) SystemBannerManager {
+	return SystemBannerManager{
+		systemBanner: api.SystemBanner{
+			Message:  message,
+			Severity: api.GetSeverity(severity),
+		},
+	}
+}
+
+// Get implements SystemBannerManager interface. Check it for more information.
+func (sbm *SystemBannerManager) Get() api.SystemBanner {
+	return sbm.systemBanner
+}

src/app/externs/backendapi.js

@@ -1553,3 +1553,11 @@ backendApi.SupportedAuthenticationModes;
  *  }}
  */
 backendApi.Status;
+
+/**
+ * @typedef {{
+ *  message: string,
+ *  severity: string
+ *  }}
+ */
+backendApi.SystemBanner;

src/app/frontend/_variables.scss

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Function
-//-- Must be defined before variables
 @function rem($multiplier) {
   $font-size: 10px;
   @return $multiplier * $font-size;
@@ -50,16 +48,11 @@ $emphasis: #000;
 $content-background: #fff;
 $chart-1: #00c752;
 $chart-2: #326de6;
-
-// Resource state chart colors
 $failed-resource-color: #f00;
 $running-resource-color: #00c752;
 $pending-resource-color: #ff0;
-
 $success-color: #008000;
 $error-color: #ff5722;
-
-// TODO(bryk): Get those variables from Angular Material scss files.
 $foreground-1: rgba(0, 0, 0, .87);
 $foreground-2: rgba(0, 0, 0, .54);
 $foreground-3: rgba(0, 0, 0, .38);
@@ -68,7 +61,6 @@ $hue-1: rgba(255, 255, 255, .87);
 $hue-2: rgba(255, 255, 255, .54);
 $hue-3: rgba(255, 255, 255, .26);
 $hue-4: rgba(255, 255, 255, .12);
-
 $background-1: rgba(158, 158, 158, .2);
 $background-2: rgba(226, 226, 226, .2);
 $overlay-color: $hue-2;

src/app/frontend/chrome/chrome.html

@@ -58,6 +58,12 @@
   </div>
 </md-toolbar>
 
+<md-toolbar class="kd-system-banner"
+            ng-class="$ctrl.getSystemBannerClass()"
+            ng-if="$ctrl.isSystemBannerVisible()"
+            ng-bind-html="$ctrl.getSystemBannerMessage()">
+</md-toolbar>
+
 <md-content layout="row"
             class="kd-app-entire-content"
             flex="auto">

src/app/frontend/chrome/chrome.scss

@@ -66,6 +66,28 @@ kd-chrome {
       margin-top: .6 * $baseline-grid;
     }
   }
+
+  .kd-system-banner {
+    background-color: $running-resource-color;
+    box-shadow: $whiteframe-shadow-1dp;
+    color: $foreground-1;
+    display: inline;
+    font-size: $body-font-size-base;
+    height: 6 * $baseline-grid;
+    line-height: 6 * $baseline-grid;
+    min-height: 6 * $baseline-grid;
+    overflow: hidden;
+    padding: 0 (3 * $baseline-grid);
+    white-space: nowrap;
+  }
+
+  .kd-system-banner-error {
+    background-color: $error-color;
+  }
+
+  .kd-system-banner-warning {
+    background-color: $warning;
+  }
 }
 
 .kd-second-toolbar {