[ML] Fixes handling of unrecognised URLs

x-pack/plugins/ml/public/application/components/ml_page/ml_page.tsx

@@ -8,7 +8,7 @@
 import React, { createContext, FC, useCallback, useMemo, useReducer } from 'react';
 import { EuiLoadingContent, EuiPageContentBody } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
-import { Route } from 'react-router-dom';
+import { Redirect, Route, Switch } from 'react-router-dom';
 import type { AppMountParameters } from '@kbn/core/public';
 import { KibanaPageTemplate, RedirectAppLinks } from '@kbn/kibana-react-plugin/public';
 import { useSideNavItems } from './side_nav';
@@ -137,25 +137,28 @@ const CommonPageWrapper: FC<CommonPageWrapperProps> = React.memo(
           value={{ setPageTitle, setHeaderActionMenu: pageDeps.setHeaderActionMenu }}
         >
           <EuiPageContentBody restrictWidth={false}>
-            {routeList.map((route) => {
-              return (
-                <Route
-                  key={route.id}
-                  path={route.path}
-                  exact
-                  render={(props) => {
-                    window.setTimeout(() => {
-                      pageDeps.setBreadcrumbs(route.breadcrumbs);
-                    });
-                    return (
-                      <MlPageWrapper path={route.path}>
-                        {route.render(props, pageDeps)}
-                      </MlPageWrapper>
-                    );
-                  }}
-                />
-              );
-            })}
+            <Switch>
+              {routeList.map((route) => {
+                return (
+                  <Route
+                    key={route.id}
+                    path={route.path}
+                    exact
+                    render={(props) => {
+                      window.setTimeout(() => {
+                        pageDeps.setBreadcrumbs(route.breadcrumbs);
+                      });
+                      return (
+                        <MlPageWrapper path={route.path}>
+                          {route.render(props, pageDeps)}
+                        </MlPageWrapper>
+                      );
+                    }}
+                  />
+                );
+              })}
+              <Redirect to="/overview" />
+            </Switch>
           </EuiPageContentBody>
         </MlPageControlsContext.Provider>
       </RedirectAppLinks>

x-pack/plugins/ml/public/application/components/ml_page/side_nav.tsx

@@ -86,6 +86,7 @@ export function useSideNavItems(activeRoute: MlRoute | undefined) {
         name: i18n.translate('xpack.ml.navMenu.anomalyDetectionTabLinkText', {
           defaultMessage: 'Anomaly Detection',
         }),
+        disabled: disableLinks,
         items: [
           {
             id: 'anomaly_detection',

x-pack/plugins/ml/public/application/routing/use_active_route.tsx

@@ -0,0 +1,99 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { useLocation, useRouteMatch } from 'react-router-dom';
+import { keyBy } from 'lodash';
+import React, { useEffect, useMemo, useRef } from 'react';
+import { toMountPoint, useExecutionContext } from '@kbn/kibana-react-plugin/public';
+import { EuiCallOut } from '@elastic/eui';
+import { FormattedMessage } from '@kbn/i18n-react';
+import { useMlKibana } from '../contexts/kibana';
+import type { MlRoute } from './router';
+
+/**
+ * Provides an active route of the ML app.
+ * @param routesList
+ */
+export const useActiveRoute = (routesList: MlRoute[]): MlRoute => {
+  const { pathname } = useLocation();
+
+  const {
+    services: { executionContext, overlays, theme },
+  } = useMlKibana();
+
+  /**
+   * Temp fix for routes with params.
+   */
+  const editCalendarMatch = useRouteMatch('/settings/calendars_list/edit_calendar/:calendarId');
+  const editFilterMatch = useRouteMatch('/settings/filter_lists/edit_filter_list/:filterId');
+
+  const routesMap = useMemo(() => keyBy(routesList, 'path'), []);
+
+  const activeRoute = useMemo(() => {
+    if (editCalendarMatch) {
+      return routesMap[editCalendarMatch.path];
+    }
+    if (editFilterMatch) {
+      return routesMap[editFilterMatch.path];
+    }
+    // Remove trailing slash from the pathname
+    const pathnameKey = pathname.replace(/\/$/, '');
+    return routesMap[pathnameKey];
+  }, [pathname]);
+
+  const bannerId = useRef<string | undefined>();
+
+  useEffect(
+    function handleNotFoundRoute() {
+      if (!activeRoute && !!pathname) {
+        bannerId.current = overlays.banners.replace(
+          bannerId.current,
+          toMountPoint(
+            <EuiCallOut
+              color="warning"
+              iconType="iInCircle"
+              title={
+                <FormattedMessage
+                  id="xpack.ml.notFoundPage.title"
+                  defaultMessage="Page Not Found"
+                />
+              }
+              data-test-subj={'mlPageNotFoundBanner'}
+            >
+              <p data-test-subj={'mlPageNotFoundBannerText'}>
+                <FormattedMessage
+                  id="xpack.ml.notFoundPage.bannerText"
+                  defaultMessage="ML application doesn't recognize this route: {route}. You've been redirected to the Overview page."
+                  values={{
+                    route: pathname,
+                  }}
+                />
+              </p>
+            </EuiCallOut>,
+            { theme$: theme.theme$ }
+          )
+        );
+
+        // hide the message after the user has had a chance to acknowledge it -- so it doesn't permanently stick around
+        setTimeout(() => {
+          if (bannerId.current) {
+            overlays.banners.remove(bannerId.current);
+          }
+        }, 15000);
+      }
+    },
+    [activeRoute, overlays, theme, pathname]
+  );
+
+  useExecutionContext(executionContext, {
+    name: 'Machine Learning',
+    type: 'application',
+    page: activeRoute?.path ?? '/overview',
+  });
+
+  return activeRoute ?? routesMap['/overview'];
+};

x-pack/test/functional/apps/ml/permissions/read_ml_access.ts

@@ -9,9 +9,10 @@ import { FtrProviderContext } from '../../../ftr_provider_context';
 
 import { USER } from '../../../services/ml/security_common';
 
-export default function ({ getService }: FtrProviderContext) {
+export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const esArchiver = getService('esArchiver');
   const ml = getService('ml');
+  const PageObjects = getPageObjects(['common', 'error']);
 
   const testUsers = [
     { user: USER.ML_VIEWER, discoverAvailable: true },
@@ -100,6 +101,13 @@ export default function ({ getService }: FtrProviderContext) {
             await ml.overviewPage.assertDFACreateJobButtonExists();
             await ml.overviewPage.assertDFACreateJobButtonEnabled(false);
           });
+
+          it('should redirect to the Overview page from the unrecognized routes', async () => {
+            await PageObjects.common.navigateToUrl('ml', 'magic-ai');
+
+            await ml.testExecution.logTestStep('should display a warning banner');
+            await ml.overviewPage.assertPageNotFoundBannerText('magic-ai');
+          });
         });
       }
     });

x-pack/test/functional/services/ml/overview_page.ts

@@ -78,5 +78,17 @@ export function MachineLearningOverviewPageProvider({ getService }: FtrProviderC
     async assertJobSyncRequiredWarningNotExists() {
       await testSubjects.missingOrFail('mlJobSyncRequiredWarning', { timeout: 5000 });
     },
+
+    async assertPageNotFoundBannerExists() {
+      await testSubjects.existOrFail('mlPageNotFoundBanner', { timeout: 5000 });
+    },
+
+    async assertPageNotFoundBannerText(pathname: string) {
+      await this.assertPageNotFoundBannerExists();
+      const text = await testSubjects.getVisibleText('mlPageNotFoundBannerText');
+      expect(text).to.eql(
+        `ML application doesn't recognize this route: /ml/${pathname}. You've been redirected to the Overview page.`
+      );
+    },
   };
 }