[Fleet] IngestManager Plugin interface for registering UI extensions

x-pack/plugins/fleet/public/applications/fleet/components/extension_wrapper.tsx

@@ -0,0 +1,17 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import React, { memo, ReactNode, Suspense } from 'react';
+import { EuiErrorBoundary } from '@elastic/eui';
+import { Loading } from './loading';
+
+export const ExtensionWrapper = memo<{ children: ReactNode }>(({ children }) => {
+  return (
+    <EuiErrorBoundary>
+      <Suspense fallback={<Loading />}>{children}</Suspense>
+    </EuiErrorBoundary>
+  );
+});

x-pack/plugins/fleet/public/applications/fleet/hooks/use_ui_extension.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import React, { useContext } from 'react';
+import { UIExtensionPoint, UIExtensionsStorage } from '../types';
+
+export const UIExtensionsContext = React.createContext<UIExtensionsStorage>({});
+
+type NarrowExtensionPoint<V extends UIExtensionPoint['view'], A = UIExtensionPoint> = A extends {
+  view: V;
+}
+  ? A
+  : never;
+
+export const useUIExtension = <V extends UIExtensionPoint['view'] = UIExtensionPoint['view']>(
+  packageName: UIExtensionPoint['package'],
+  view: V
+): NarrowExtensionPoint<V>['component'] | undefined => {
+  const registeredExtensions = useContext(UIExtensionsContext);
+
+  if (!registeredExtensions) {
+    throw new Error('useUIExtension called outside of UIExtensionsContext');
+  }
+
+  const extension = registeredExtensions?.[packageName]?.[view];
+
+  if (extension) {
+    // FIXME:PT Revisit ignore below and see if TS error can be addressed
+    // @ts-ignore
+    return extension.component;
+  }
+};

x-pack/plugins/fleet/public/applications/fleet/index.tsx

@@ -36,6 +36,8 @@ import {
 import { PackageInstallProvider } from './sections/epm/hooks';
 import { FleetStatusProvider, useBreadcrumbs } from './hooks';
 import { IntraAppStateProvider } from './hooks/use_intra_app_state';
+import { UIExtensionsStorage } from './types';
+import { UIExtensionsContext } from './hooks/use_ui_extension';
 
 export interface ProtectedRouteProps extends RouteProps {
   isAllowed?: boolean;
@@ -235,6 +237,7 @@ const IngestManagerApp = ({
   config,
   history,
   kibanaVersion,
+  extensions,
 }: {
   basepath: string;
   coreStart: CoreStart;
@@ -243,6 +246,7 @@ const IngestManagerApp = ({
   config: IngestManagerConfigType;
   history: AppMountParameters['history'];
   kibanaVersion: string;
+  extensions: UIExtensionsStorage;
 }) => {
   const isDarkMode = useObservable<boolean>(coreStart.uiSettings.get$('theme:darkMode'));
   return (
@@ -252,7 +256,9 @@ const IngestManagerApp = ({
           <ConfigContext.Provider value={config}>
             <KibanaVersionContext.Provider value={kibanaVersion}>
               <EuiThemeProvider darkMode={isDarkMode}>
-                <IngestManagerRoutes history={history} basepath={basepath} />
+                <UIExtensionsContext.Provider value={extensions}>
+                  <IngestManagerRoutes history={history} basepath={basepath} />
+                </UIExtensionsContext.Provider>
               </EuiThemeProvider>
             </KibanaVersionContext.Provider>
           </ConfigContext.Provider>
@@ -268,7 +274,8 @@ export function renderApp(
   setupDeps: IngestManagerSetupDeps,
   startDeps: IngestManagerStartDeps,
   config: IngestManagerConfigType,
-  kibanaVersion: string
+  kibanaVersion: string,
+  extensions: UIExtensionsStorage
 ) {
   ReactDOM.render(
     <IngestManagerApp
@@ -279,6 +286,7 @@ export function renderApp(
       config={config}
       history={history}
       kibanaVersion={kibanaVersion}
+      extensions={extensions}
     />,
     element
   );

x-pack/plugins/fleet/public/applications/fleet/sections/agent_policy/create_package_policy_page/components/index.ts

@@ -6,4 +6,3 @@
 export { CreatePackagePolicyPageLayout } from './layout';
 export { PackagePolicyInputPanel } from './package_policy_input_panel';
 export { PackagePolicyInputVarField } from './package_policy_input_var_field';
-export { CustomPackagePolicy } from './custom_package_policy';

x-pack/plugins/fleet/public/applications/fleet/sections/agent_policy/create_package_policy_page/index.tsx

@@ -46,6 +46,9 @@ import { StepSelectAgentPolicy } from './step_select_agent_policy';
 import { StepConfigurePackagePolicy } from './step_configure_package';
 import { StepDefinePackagePolicy } from './step_define_package_policy';
 import { useIntraAppState } from '../../../hooks/use_intra_app_state';
+import { useUIExtension } from '../../../hooks/use_ui_extension';
+import { ExtensionWrapper } from '../../../components/extension_wrapper';
+import { PackagePolicyEditExtensionComponentProps } from '../../../types';
 
 const StepsWithLessPadding = styled(EuiSteps)`
   .euiStep__content {
@@ -191,6 +194,21 @@ export const CreatePackagePolicyPage: React.FunctionComponent = () => {
     [packagePolicy, updatePackagePolicyValidation]
   );
 
+  const handleExtensionViewOnChange = useCallback<
+    PackagePolicyEditExtensionComponentProps['onChange']
+  >(
+    ({ isValid, updatedPolicy }) => {
+      updatePackagePolicy(updatedPolicy);
+      setFormState((prevState) => {
+        if (prevState === 'VALID' && !isValid) {
+          return 'INVALID';
+        }
+        return prevState;
+      });
+    },
+    [updatePackagePolicy]
+  );
+
   // Cancel path
   const cancelUrl = useMemo(() => {
     if (routeState && routeState.onCancelUrl) {
@@ -287,6 +305,8 @@ export const CreatePackagePolicyPage: React.FunctionComponent = () => {
     [pkgkey, updatePackageInfo, agentPolicy, updateAgentPolicy]
   );
 
+  const ExtensionView = useUIExtension(packagePolicy.package?.name ?? '', 'package-policy-create');
+
   const stepSelectPackage = useMemo(
     () => (
       <StepSelectPackage
@@ -320,18 +340,26 @@ export const CreatePackagePolicyPage: React.FunctionComponent = () => {
             validationResults={validationResults!}
             submitAttempted={formState === 'INVALID'}
           />
+          {/* If an Agent Policy and a package has been selected, then show UI extension (if any) */}
+          {packagePolicy.policy_id && packagePolicy.package?.name && ExtensionView && (
+            <ExtensionWrapper>
+              <ExtensionView newPolicy={packagePolicy} onChange={handleExtensionViewOnChange} />
+            </ExtensionWrapper>
+          )}
         </>
       ) : (
         <div />
       ),
     [
-      agentPolicy,
-      formState,
       isLoadingSecondStep,
-      packagePolicy,
+      agentPolicy,
       packageInfo,
+      packagePolicy,
       updatePackagePolicy,
       validationResults,
+      formState,
+      ExtensionView,
+      handleExtensionViewOnChange,
     ]
   );
 

x-pack/plugins/fleet/public/applications/fleet/sections/agent_policy/create_package_policy_page/step_configure_package.tsx

@@ -4,7 +4,14 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 import React from 'react';
-import { EuiHorizontalRule, EuiFlexGroup, EuiFlexItem } from '@elastic/eui';
+import {
+  EuiHorizontalRule,
+  EuiFlexGroup,
+  EuiFlexItem,
+  EuiEmptyPrompt,
+  EuiText,
+} from '@elastic/eui';
+import { FormattedMessage } from '@kbn/i18n/react';
 import {
   PackageInfo,
   RegistryStream,
@@ -13,8 +20,9 @@ import {
 } from '../../../types';
 import { Loading } from '../../../components';
 import { PackagePolicyValidationResults } from './services';
-import { PackagePolicyInputPanel, CustomPackagePolicy } from './components';
+import { PackagePolicyInputPanel } from './components';
 import { CreatePackagePolicyFrom } from './types';
+import { useUIExtension } from '../../../hooks/use_ui_extension';
 
 const findStreamsForInputType = (
   inputType: string,
@@ -55,6 +63,12 @@ export const StepConfigurePackagePolicy: React.FunctionComponent<{
   validationResults,
   submitAttempted,
 }) => {
+  const hasUiExtension =
+    useUIExtension(
+      packageInfo.name,
+      from === 'edit' ? 'package-policy-edit' : 'package-policy-create'
+    ) !== undefined;
+
   // Configure inputs (and their streams)
   // Assume packages only export one config template for now
   const renderConfigureInputs = () =>
@@ -98,12 +112,20 @@ export const StepConfigurePackagePolicy: React.FunctionComponent<{
           })}
         </EuiFlexGroup>
       </>
-    ) : (
-      <CustomPackagePolicy
-        from={from}
-        packageName={packageInfo.name}
-        packagePolicy={packagePolicy}
-        packagePolicyId={packagePolicyId}
+    ) : hasUiExtension ? null : (
+      <EuiEmptyPrompt
+        iconType="checkInCircleFilled"
+        iconColor="secondary"
+        body={
+          <EuiText>
+            <p>
+              <FormattedMessage
+                id="xpack.fleet.createPackagePolicy.stepConfigure.noPolicyOptionsMessage"
+                defaultMessage="Nothing to configure"
+              />
+            </p>
+          </EuiText>
+        }
       />
     );