[Security Solution] Store expandable flyout state in the url (#154703)

.github/CODEOWNERS

@@ -683,6 +683,7 @@ src/plugins/unified_search @elastic/kibana-visualizations
 x-pack/plugins/upgrade_assistant @elastic/platform-deployment-management
 x-pack/plugins/drilldowns/url_drilldown @elastic/kibana-app-services
 src/plugins/url_forwarding @elastic/kibana-visualizations
+packages/kbn-url-state @elastic/security-threat-hunting-investigations
 src/plugins/usage_collection @elastic/kibana-core
 test/plugin_functional/plugins/usage_collection @elastic/kibana-core
 packages/kbn-user-profile-components @elastic/kibana-security

package.json

@@ -672,6 +672,7 @@
     "@kbn/upgrade-assistant-plugin": "link:x-pack/plugins/upgrade_assistant",
     "@kbn/url-drilldown-plugin": "link:x-pack/plugins/drilldowns/url_drilldown",
     "@kbn/url-forwarding-plugin": "link:src/plugins/url_forwarding",
+    "@kbn/url-state": "link:packages/kbn-url-state",
     "@kbn/usage-collection-plugin": "link:src/plugins/usage_collection",
     "@kbn/usage-collection-test-plugin": "link:test/plugin_functional/plugins/usage_collection",
     "@kbn/user-profile-components": "link:packages/kbn-user-profile-components",

packages/kbn-expandable-flyout/index.ts

@@ -7,7 +7,13 @@
  */
 
 export { ExpandableFlyout } from './src';
-export { ExpandableFlyoutProvider, useExpandableFlyoutContext } from './src/context';
+export {
+  ExpandableFlyoutProvider,
+  useExpandableFlyoutContext,
+  type ExpandableFlyoutContext,
+} from './src/context';
+
+export type { ExpandableFlyoutApi } from './src/context';
 
 export type { ExpandableFlyoutProps } from './src';
 export type { FlyoutPanel } from './src/types';

packages/kbn-expandable-flyout/src/context.tsx

@@ -6,7 +6,15 @@
  * Side Public License, v 1.
  */
 
-import React, { createContext, useCallback, useContext, useMemo, useReducer } from 'react';
+import React, {
+  createContext,
+  useCallback,
+  useContext,
+  useEffect,
+  useImperativeHandle,
+  useMemo,
+  useReducer,
+} from 'react';
 import { ActionType } from './actions';
 import { reducer, State } from './reducer';
 import type { FlyoutPanel } from './types';
@@ -59,19 +67,44 @@ export const ExpandableFlyoutContext = createContext<ExpandableFlyoutContext | u
   undefined
 );
 
+export type ExpandableFlyoutApi = Pick<ExpandableFlyoutContext, 'openFlyout'> & {
+  getState: () => State;
+};
+
 export interface ExpandableFlyoutProviderProps {
   /**
    * React children
    */
   children: React.ReactNode;
+  /**
+   * Triggered whenever flyout state changes. You can use it to store it's state somewhere for instance.
+   */
+  onChanges?: (state: State) => void;
+  /**
+   * Triggered whenever flyout is closed. This is independent from the onChanges above.
+   */
+  onClosePanels?: () => void;
 }
 
 /**
  * Wrap your plugin with this context for the ExpandableFlyout React component.
  */
-export const ExpandableFlyoutProvider = ({ children }: ExpandableFlyoutProviderProps) => {
+export const ExpandableFlyoutProvider = React.forwardRef<
+  ExpandableFlyoutApi,
+  ExpandableFlyoutProviderProps
+>(({ children, onChanges = () => {}, onClosePanels = () => {} }, ref) => {
   const [state, dispatch] = useReducer(reducer, initialState);
 
+  useEffect(() => {
+    const closed = !state.right;
+    if (closed) {
+      // manual close is singalled via separate callback
+      return;
+    }
+
+    onChanges(state);
+  }, [state, onChanges]);
+
   const openPanels = useCallback(
     ({
       right,
@@ -87,40 +120,45 @@ export const ExpandableFlyoutProvider = ({ children }: ExpandableFlyoutProviderP
 
   const openRightPanel = useCallback(
     (panel: FlyoutPanel) => dispatch({ type: ActionType.openRightPanel, payload: panel }),
-    [dispatch]
+    []
   );
 
   const openLeftPanel = useCallback(
     (panel: FlyoutPanel) => dispatch({ type: ActionType.openLeftPanel, payload: panel }),
-    [dispatch]
+    []
   );
 
   const openPreviewPanel = useCallback(
     (panel: FlyoutPanel) => dispatch({ type: ActionType.openPreviewPanel, payload: panel }),
-    [dispatch]
+    []
   );
 
-  const closeRightPanel = useCallback(
-    () => dispatch({ type: ActionType.closeRightPanel }),
-    [dispatch]
-  );
+  const closeRightPanel = useCallback(() => dispatch({ type: ActionType.closeRightPanel }), []);
 
-  const closeLeftPanel = useCallback(
-    () => dispatch({ type: ActionType.closeLeftPanel }),
-    [dispatch]
-  );
+  const closeLeftPanel = useCallback(() => dispatch({ type: ActionType.closeLeftPanel }), []);
 
-  const closePreviewPanel = useCallback(
-    () => dispatch({ type: ActionType.closePreviewPanel }),
-    [dispatch]
-  );
+  const closePreviewPanel = useCallback(() => dispatch({ type: ActionType.closePreviewPanel }), []);
 
   const previousPreviewPanel = useCallback(
     () => dispatch({ type: ActionType.previousPreviewPanel }),
-    [dispatch]
+    []
   );
 
-  const closePanels = useCallback(() => dispatch({ type: ActionType.closeFlyout }), [dispatch]);
+  const closePanels = useCallback(() => {
+    dispatch({ type: ActionType.closeFlyout });
+    onClosePanels();
+  }, [onClosePanels]);
+
+  useImperativeHandle(
+    ref,
+    () => {
+      return {
+        openFlyout: openPanels,
+        getState: () => state,
+      };
+    },
+    [openPanels, state]
+  );
 
   const contextValue = useMemo(
     () => ({
@@ -154,7 +192,7 @@ export const ExpandableFlyoutProvider = ({ children }: ExpandableFlyoutProviderP
       {children}
     </ExpandableFlyoutContext.Provider>
   );
-};
+});
 
 /**
  * Retrieve context's properties

packages/kbn-expandable-flyout/src/reducer.ts

@@ -105,5 +105,8 @@ export function reducer(state: State, action: Action) {
         preview: [],
       };
     }
+
+    default:
+      return state;
   }
 }

packages/kbn-url-state/README.md

@@ -0,0 +1,45 @@
+# @kbn/url-state - utils for syncing state to URL
+
+This package provides:
+
+- a React hook called `useSyncToUrl` that can be used to synchronize state to the URL. This can be useful when you want to make a portion of state shareable.
+
+## useSyncToUrl
+
+The `useSyncToUrl` hook takes three arguments:
+
+```
+key (string): The key to use in the URL to store the state.
+restore (function): A function that is called with the deserialized value from the URL. You should use this function to update your state based on the value from the URL.
+cleanupOnHistoryNavigation (optional boolean, default: true): If true, the hook will clear the URL state when the user navigates using the browser's history API.
+```
+
+### Example usage:
+
+```
+import React, { useState } from 'react';
+import { useSyncToUrl } from '@kbn/url-state';
+
+function MyComponent() {
+  const [count, setCount] = useState(0);
+
+  useSyncToUrl('count', (value) => {
+    setCount(value);
+  });
+
+  const handleClick = () => {
+    setCount((prevCount) => prevCount + 1);
+  };
+
+  return (
+    <div>
+      <p>Count: {count}</p>
+      <button onClick={handleClick}>Increment</button>
+    </div>
+  );
+}
+```
+
+In this example, the count state is synced to the URL using the `useSyncToUrl` hook.
+Whenever the count state changes, the hook will update the URL with the new value.
+When the user copies the updated url or refreshes the page, `restore` function will be called to update the count state.

packages/kbn-url-state/index.test.ts

@@ -0,0 +1,101 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { renderHook, act } from '@testing-library/react-hooks';
+import { useSyncToUrl } from '.';
+import { encode } from '@kbn/rison';
+
+describe('useSyncToUrl', () => {
+  let originalLocation: Location;
+  let originalHistory: History;
+
+  beforeEach(() => {
+    originalLocation = window.location;
+    originalHistory = window.history;
+    delete (window as any).location;
+    delete (window as any).history;
+
+    window.location = {
+      ...originalLocation,
+      search: '',
+    };
+    window.history = {
+      ...originalHistory,
+      replaceState: jest.fn(),
+    };
+  });
+
+  afterEach(() => {
+    window.location = originalLocation;
+    window.history = originalHistory;
+  });
+
+  it('should restore the value from the query string on mount', () => {
+    const key = 'testKey';
+    const restoredValue = { test: 'value' };
+    const encodedValue = encode(restoredValue);
+    const restore = jest.fn();
+
+    window.location.search = `?${key}=${encodedValue}`;
+
+    renderHook(() => useSyncToUrl(key, restore));
+
+    expect(restore).toHaveBeenCalledWith(restoredValue);
+  });
+
+  it('should sync the value to the query string', () => {
+    const key = 'testKey';
+    const valueToSerialize = { test: 'value' };
+
+    const { result } = renderHook(() => useSyncToUrl(key, jest.fn()));
+
+    act(() => {
+      result.current(valueToSerialize);
+    });
+
+    expect(window.history.replaceState).toHaveBeenCalledWith(
+      { path: expect.any(String) },
+      '',
+      '/?testKey=%28test%3Avalue%29'
+    );
+  });
+
+  it('should clear the value from the query string on unmount', () => {
+    const key = 'testKey';
+
+    const { unmount } = renderHook(() => useSyncToUrl(key, jest.fn()));
+
+    act(() => {
+      unmount();
+    });
+
+    expect(window.history.replaceState).toHaveBeenCalledWith(
+      { path: expect.any(String) },
+      '',
+      expect.any(String)
+    );
+  });
+
+  it('should clear the value from the query string when history back or forward is pressed', () => {
+    const key = 'testKey';
+    const restore = jest.fn();
+
+    renderHook(() => useSyncToUrl(key, restore, true));
+
+    act(() => {
+      window.dispatchEvent(new Event('popstate'));
+    });
+
+    expect(window.history.replaceState).toHaveBeenCalledTimes(1);
+    expect(window.history.replaceState).toHaveBeenCalledWith(
+      { path: expect.any(String) },
+      '',
+      '/?'
+    );
+  });
+});

packages/kbn-url-state/index.ts

@@ -0,0 +1,9 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+export { useSyncToUrl } from './use_sync_to_url';

packages/kbn-url-state/jest.config.js

@@ -0,0 +1,13 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+module.exports = {
+  preset: '@kbn/test',
+  rootDir: '../..',
+  roots: ['<rootDir>/packages/kbn-url-state'],
+};

packages/kbn-url-state/kibana.jsonc

@@ -0,0 +1,5 @@
+{
+  "type": "shared-common",
+  "id": "@kbn/url-state",
+  "owner": "@elastic/security-threat-hunting-investigations"
+}

packages/kbn-url-state/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "@kbn/url-state",
+  "private": true,
+  "version": "1.0.0",
+  "license": "SSPL-1.0 OR Elastic License 2.0"
+}

packages/kbn-url-state/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "target/types",
+    "types": [
+      "jest",
+      "node",
+      "react"
+    ]
+  },
+  "include": [
+    "**/*.ts",
+    "**/*.tsx",
+  ],
+  "exclude": [
+    "target/**/*"
+  ],
+  "kbn_references": [
+    "@kbn/rison",
+  ]
+}

packages/kbn-url-state/use_sync_to_url.ts

@@ -0,0 +1,87 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { useCallback, useEffect } from 'react';
+import { encode, decode } from '@kbn/rison';
+
+// https://developer.mozilla.org/en-US/docs/Web/API/Window/popstate_event
+const POPSTATE_EVENT = 'popstate' as const;
+
+/**
+ * Sync any object with browser query string using @knb/rison
+ *  @param key query string param to use
+ *  @param restore use this to handle restored state
+ *  @param cleanupOnHistoryNavigation use history events to cleanup state on back / forward naviation. true by default
+ */
+export const useSyncToUrl = <TValueToSerialize>(
+  key: string,
+  restore: (data: TValueToSerialize) => void,
+  cleanupOnHistoryNavigation = true
+) => {
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    const param = params.get(key);
+
+    if (!param) {
+      return;
+    }
+
+    const decodedQuery = decode(param);
+
+    if (!decodedQuery) {
+      return;
+    }
+
+    // Only restore the value if it is not falsy
+    restore(decodedQuery as unknown as TValueToSerialize);
+  }, [key, restore]);
+
+  /**
+   * Synces value with the url state, under specified key. If payload is undefined, the value will be removed from the query string althogether.
+   */
+  const syncValueToQueryString = useCallback(
+    (valueToSerialize?: TValueToSerialize) => {
+      const searchParams = new URLSearchParams(window.location.search);
+
+      if (valueToSerialize) {
+        const serializedPayload = encode(valueToSerialize);
+        searchParams.set(key, serializedPayload);
+      } else {
+        searchParams.delete(key);
+      }
+
+      const newSearch = searchParams.toString();
+
+      // Update query string without unnecessary re-render
+      const newUrl = `${window.location.pathname}?${newSearch}`;
+      window.history.replaceState({ path: newUrl }, '', newUrl);
+    },
+    [key]
+  );
+
+  // Clear remove state from the url on unmount / when history back or forward is pressed
+  useEffect(() => {
+    const clearState = () => {
+      syncValueToQueryString(undefined);
+    };
+
+    if (cleanupOnHistoryNavigation) {
+      window.addEventListener(POPSTATE_EVENT, clearState);
+    }
+
+    return () => {
+      clearState();
+
+      if (cleanupOnHistoryNavigation) {
+        window.removeEventListener(POPSTATE_EVENT, clearState);
+      }
+    };
+  }, [cleanupOnHistoryNavigation, syncValueToQueryString]);
+
+  return syncValueToQueryString;
+};

tsconfig.base.json

@@ -1360,6 +1360,8 @@
       "@kbn/url-drilldown-plugin/*": ["x-pack/plugins/drilldowns/url_drilldown/*"],
       "@kbn/url-forwarding-plugin": ["src/plugins/url_forwarding"],
       "@kbn/url-forwarding-plugin/*": ["src/plugins/url_forwarding/*"],
+      "@kbn/url-state": ["packages/kbn-url-state"],
+      "@kbn/url-state/*": ["packages/kbn-url-state/*"],
       "@kbn/usage-collection-plugin": ["src/plugins/usage_collection"],
       "@kbn/usage-collection-plugin/*": ["src/plugins/usage_collection/*"],
       "@kbn/usage-collection-test-plugin": ["test/plugin_functional/plugins/usage_collection"],

x-pack/plugins/security_solution/cypress/e2e/detection_alerts/expandable_flyout/alert_details_url_sync.cy.ts

@@ -0,0 +1,55 @@
+/*
+ * 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 { getNewRule } from '../../../objects/rule';
+import { cleanKibana } from '../../../tasks/common';
+import { waitForAlertsToPopulate } from '../../../tasks/create_new_rule';
+import { expandFirstAlertExpandableFlyout } from '../../../tasks/document_expandable_flyout';
+import { login, visit } from '../../../tasks/login';
+import { createRule } from '../../../tasks/api_calls/rules';
+import { ALERTS_URL } from '../../../urls/navigation';
+import {
+  DOCUMENT_DETAILS_FLYOUT_CLOSE_BUTTON,
+  DOCUMENT_DETAILS_FLYOUT_HEADER_TITLE,
+} from '../../../screens/document_expandable_flyout';
+
+// Skipping these for now as the feature is protected behind a feature flag set to false by default
+// To run the tests locally, add 'securityFlyoutEnabled' in the Cypress config.ts here https://github.com/elastic/kibana/blob/main/x-pack/test/security_solution_cypress/config.ts#L50
+describe.skip('Expandable flyout state sync', { testIsolation: false }, () => {
+  const rule = getNewRule();
+
+  before(() => {
+    cleanKibana();
+    login();
+    createRule(rule);
+    visit(ALERTS_URL);
+    waitForAlertsToPopulate();
+    expandFirstAlertExpandableFlyout();
+  });
+
+  it('should serialize its state to url', () => {
+    cy.url().should('include', 'eventFlyout');
+    cy.get(DOCUMENT_DETAILS_FLYOUT_HEADER_TITLE).should('be.visible').and('have.text', rule.name);
+  });
+
+  it('should reopen the flyout after browser refresh', () => {
+    cy.reload();
+
+    cy.url().should('include', 'eventFlyout');
+    cy.get(DOCUMENT_DETAILS_FLYOUT_HEADER_TITLE).should('be.visible').and('have.text', rule.name);
+  });
+
+  it('should clear the url state when flyout is closed', () => {
+    cy.reload();
+
+    cy.get(DOCUMENT_DETAILS_FLYOUT_HEADER_TITLE).should('be.visible').and('have.text', rule.name);
+
+    cy.get(DOCUMENT_DETAILS_FLYOUT_CLOSE_BUTTON).click();
+
+    cy.url().should('not.include', 'eventFlyout');
+  });
+});

x-pack/plugins/security_solution/cypress/screens/document_expandable_flyout.ts

@@ -335,3 +335,6 @@ export const DOCUMENT_DETAILS_FLYOUT_TABLE_TAB_ROW_CELL_ADD_TO_TIMELINE =
   getDataTestSubjectSelector('actionItem-security-detailsFlyout-cellActions-addToTimeline');
 export const DOCUMENT_DETAILS_FLYOUT_TABLE_TAB_ROW_CELL_COPY_TO_CLIPBOARD =
   getDataTestSubjectSelector('actionItem-security-detailsFlyout-cellActions-copyToClipboard');
+
+export const DOCUMENT_DETAILS_FLYOUT_CLOSE_BUTTON =
+  getDataTestSubjectSelector('euiFlyoutCloseButton');

x-pack/plugins/security_solution/public/app/home/template_wrapper/index.tsx

@@ -27,6 +27,7 @@ import { useShowTimeline } from '../../../common/utils/timeline/use_show_timelin
 import { useShowPagesWithEmptyView } from '../../../common/utils/empty_view/use_show_pages_with_empty_view';
 import { useIsPolicySettingsBarVisible } from '../../../management/pages/policy/view/policy_hooks';
 import { useIsGroupedNavigationEnabled } from '../../../common/components/navigation/helpers';
+import { useSyncFlyoutStateWithUrl } from '../../../flyout/url/use_sync_flyout_state_with_url';
 
 const NO_DATA_PAGE_MAX_WIDTH = 950;
 
@@ -75,6 +76,8 @@ export const SecuritySolutionTemplateWrapper: React.FC<Omit<KibanaPageTemplatePr
 
     const showEmptyState = useShowPagesWithEmptyView() || rest.isEmptyState;
 
+    const [flyoutRef, handleFlyoutChangedOrClosed] = useSyncFlyoutStateWithUrl();
+
     /*
      * StyledKibanaPageTemplate is a styled EuiPageTemplate. Security solution currently passes the header
      * and page content as the children of StyledKibanaPageTemplate, as opposed to using the pageHeader prop,
@@ -82,7 +85,11 @@ export const SecuritySolutionTemplateWrapper: React.FC<Omit<KibanaPageTemplatePr
      * between EuiPageTemplate and the security solution pages.
      */
     return (
-      <ExpandableFlyoutProvider>
+      <ExpandableFlyoutProvider
+        onChanges={handleFlyoutChangedOrClosed}
+        onClosePanels={handleFlyoutChangedOrClosed}
+        ref={flyoutRef}
+      >
         <StyledKibanaPageTemplate
           $addBottomPadding={addBottomPadding}
           $isShowingTimelineOverlay={isShowingTimelineOverlay}
@@ -108,7 +115,11 @@ export const SecuritySolutionTemplateWrapper: React.FC<Omit<KibanaPageTemplatePr
               </EuiThemeProvider>
             </KibanaPageTemplate.BottomBar>
           )}
-          <ExpandableFlyout registeredPanels={expandableFlyoutDocumentsPanels} onClose={() => {}} />
+          <ExpandableFlyout
+            registeredPanels={expandableFlyoutDocumentsPanels}
+            onClose={() => {}}
+            handleOnFlyoutClosed={handleFlyoutChangedOrClosed}
+          />
         </StyledKibanaPageTemplate>
       </ExpandableFlyoutProvider>
     );

x-pack/plugins/security_solution/public/common/hooks/use_url_state.ts

@@ -15,6 +15,9 @@ import { useQueryTimelineByIdOnUrlChange } from './timeline/use_query_timeline_b
 import { useInitFlyoutFromUrlParam } from './flyout/use_init_flyout_url_param';
 import { useSyncFlyoutUrlParam } from './flyout/use_sync_flyout_url_param';
 
+// NOTE: the expandable flyout package url state is handled here:
+// x-pack/plugins/security_solution/public/flyout/url/use_sync_flyout_state_with_url.tsx
+
 export const useUrlState = () => {
   useSyncGlobalQueryString();
   useInitSearchBarFromUrlParams();

x-pack/plugins/security_solution/public/flyout/url/use_sync_flyout_state_with_url.test.tsx

@@ -0,0 +1,77 @@
+/*
+ * 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 type { ExpandableFlyoutApi } from '@kbn/expandable-flyout';
+import { useSyncToUrl } from '@kbn/url-state';
+import { renderHook } from '@testing-library/react-hooks';
+import { useSyncFlyoutStateWithUrl } from './use_sync_flyout_state_with_url';
+
+jest.mock('@kbn/url-state');
+
+describe('useSyncFlyoutStateWithUrl', () => {
+  it('should return an array containing flyoutApi ref and handleFlyoutChanges function', () => {
+    const { result } = renderHook(() => useSyncFlyoutStateWithUrl());
+    const [flyoutApi, handleFlyoutChanges] = result.current;
+
+    expect(flyoutApi.current).toBeNull();
+    expect(typeof handleFlyoutChanges).toBe('function');
+  });
+
+  it('should open flyout when relevant url state is detected in the query string', () => {
+    jest.useFakeTimers();
+
+    jest.mocked(useSyncToUrl).mockImplementation((_urlKey, callback) => {
+      setTimeout(() => callback({ mocked: { flyout: 'state' } }), 0);
+      return jest.fn();
+    });
+
+    const { result } = renderHook(() => useSyncFlyoutStateWithUrl());
+    const [flyoutApi, handleFlyoutChanges] = result.current;
+
+    const flyoutApiMock: ExpandableFlyoutApi = {
+      openFlyout: jest.fn(),
+      getState: () => ({ left: undefined, right: undefined, preview: [] }),
+    };
+
+    expect(typeof handleFlyoutChanges).toBe('function');
+    expect(flyoutApi.current).toBeNull();
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (flyoutApi as any).current = flyoutApiMock;
+
+    jest.runOnlyPendingTimers();
+    jest.useRealTimers();
+
+    expect(flyoutApiMock.openFlyout).toHaveBeenCalledTimes(1);
+    expect(flyoutApiMock.openFlyout).toHaveBeenCalledWith({ mocked: { flyout: 'state' } });
+  });
+
+  it('should sync flyout state to url whenever handleFlyoutChanges is called by the consumer', () => {
+    const syncStateToUrl = jest.fn();
+    jest.mocked(useSyncToUrl).mockImplementation((_urlKey, callback) => {
+      setTimeout(() => callback({ mocked: { flyout: 'state' } }), 0);
+      return syncStateToUrl;
+    });
+
+    const { result } = renderHook(() => useSyncFlyoutStateWithUrl());
+    const [_flyoutApi, handleFlyoutChanges] = result.current;
+
+    handleFlyoutChanges();
+
+    expect(syncStateToUrl).toHaveBeenCalledTimes(1);
+    expect(syncStateToUrl).toHaveBeenLastCalledWith(undefined);
+
+    handleFlyoutChanges({ left: undefined, right: undefined, preview: [] });
+
+    expect(syncStateToUrl).toHaveBeenLastCalledWith({
+      left: undefined,
+      right: undefined,
+      preview: undefined,
+    });
+    expect(syncStateToUrl).toHaveBeenCalledTimes(2);
+  });
+});

x-pack/plugins/security_solution/public/flyout/url/use_sync_flyout_state_with_url.tsx

@@ -0,0 +1,45 @@
+/*
+ * 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 { useCallback, useRef } from 'react';
+import type { ExpandableFlyoutApi, ExpandableFlyoutContext } from '@kbn/expandable-flyout';
+import { useSyncToUrl } from '@kbn/url-state';
+import last from 'lodash/last';
+
+const URL_KEY = 'eventFlyout' as const;
+
+type FlyoutState = Parameters<ExpandableFlyoutApi['openFlyout']>[0];
+
+/**
+ * Sync flyout state with the url and open it when relevant url state is detected in the query string
+ * @returns [ref, flyoutChangesHandler]
+ */
+export const useSyncFlyoutStateWithUrl = () => {
+  const flyoutApi = useRef<ExpandableFlyoutApi>(null);
+
+  const syncStateToUrl = useSyncToUrl<FlyoutState>(URL_KEY, (data) => {
+    flyoutApi.current?.openFlyout(data);
+  });
+
+  // This should be bound to flyout changed and closed events.
+  // When flyout is closed, url state is cleared
+  const handleFlyoutChanges = useCallback(
+    (state?: ExpandableFlyoutContext['panels']) => {
+      if (!state) {
+        return syncStateToUrl(undefined);
+      }
+
+      return syncStateToUrl({
+        ...state,
+        preview: last(state.preview),
+      });
+    },
+    [syncStateToUrl]
+  );
+
+  return [flyoutApi, handleFlyoutChanges] as const;
+};

x-pack/plugins/security_solution/tsconfig.json

@@ -23,7 +23,9 @@
   ],
   "kbn_references": [
     "@kbn/core",
-    { "path": "../../../src/setup_node_env/tsconfig.json" },
+    {
+      "path": "../../../src/setup_node_env/tsconfig.json"
+    },
     "@kbn/data-plugin",
     "@kbn/embeddable-plugin",
     "@kbn/files-plugin",
@@ -153,5 +155,6 @@
     "@kbn/security-solution-side-nav",
     "@kbn/core-lifecycle-browser",
     "@kbn/ecs",
+    "@kbn/url-state"
   ]
 }

yarn.lock

@@ -5457,6 +5457,10 @@
   version "0.0.0"
   uid ""
 
+"@kbn/url-state@link:packages/kbn-url-state":
+  version "0.0.0"
+  uid ""
+
 "@kbn/usage-collection-plugin@link:src/plugins/usage_collection":
   version "0.0.0"
   uid ""