[Console] Fix load_from param

src/plugins/console/public/application/containers/editor/hooks/use_set_initial_value.test.ts

@@ -0,0 +1,178 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import { renderHook, act } from '@testing-library/react-hooks';
+import { useSetInitialValue } from './use_set_initial_value';
+import { IToasts } from '@kbn/core-notifications-browser';
+import { decompressFromEncodedURIComponent } from 'lz-string';
+import { DEFAULT_INPUT_VALUE } from '../../../../../common/constants';
+
+jest.mock('lz-string', () => ({
+  decompressFromEncodedURIComponent: jest.fn(),
+}));
+
+jest.mock('./use_set_initial_value', () => ({
+  ...jest.requireActual('./use_set_initial_value'),
+}));
+
+describe('useSetInitialValue', () => {
+  const setValueMock = jest.fn();
+  const addWarningMock = jest.fn();
+  const toastsMock: IToasts = { addWarning: addWarningMock } as any;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should set the initial value only once', async () => {
+    const { rerender } = renderHook(() =>
+      useSetInitialValue({
+        localStorageValue: 'initial value',
+        setValue: setValueMock,
+        toasts: toastsMock,
+      })
+    );
+
+    // Verify initial value is set on first render
+    expect(setValueMock).toHaveBeenCalledTimes(1);
+    expect(setValueMock).toHaveBeenCalledWith('initial value');
+
+    // Re-render the hook to simulate a component update
+    rerender();
+
+    // Verify that setValue is not called again after rerender
+    expect(setValueMock).toHaveBeenCalledTimes(1); // Still 1, no additional calls
+  });
+
+  it('should set value from localStorage if no load_from param is present', () => {
+    renderHook(() =>
+      useSetInitialValue({
+        localStorageValue: 'saved value',
+        setValue: setValueMock,
+        toasts: toastsMock,
+      })
+    );
+
+    expect(setValueMock).toHaveBeenCalledWith('saved value');
+  });
+
+  it('should set default value if localStorage is undefined and no load_from param is present', () => {
+    renderHook(() =>
+      useSetInitialValue({
+        localStorageValue: undefined,
+        setValue: setValueMock,
+        toasts: toastsMock,
+      })
+    );
+
+    expect(setValueMock).toHaveBeenCalledWith(DEFAULT_INPUT_VALUE);
+  });
+
+  it('should load data from load_from param if it is a valid Elastic URL', async () => {
+    Object.defineProperty(window, 'location', {
+      writable: true,
+      value: {
+        hash: '?load_from=https://www.elastic.co/some-data',
+      },
+    });
+
+    // Mock fetch to return "remote data"
+    global.fetch = jest.fn(() =>
+      Promise.resolve({
+        text: () => Promise.resolve('remote data'),
+      })
+    ) as jest.Mock;
+
+    await act(async () => {
+      renderHook(() =>
+        useSetInitialValue({
+          localStorageValue: 'initial value',
+          setValue: setValueMock,
+          toasts: toastsMock,
+        })
+      );
+    });
+
+    expect(fetch).toHaveBeenCalledWith(new URL('https://www.elastic.co/some-data'));
+    // The remote data should be appended to the initial value in the editor
+    expect(setValueMock).toHaveBeenCalledWith('initial value\n\nremote data');
+  });
+
+  it('should show a warning if the load_from param is not an Elastic domain', async () => {
+    Object.defineProperty(window, 'location', {
+      writable: true,
+      value: {
+        hash: '?load_from=https://not.elastic.com/some-data',
+      },
+    });
+
+    await act(async () => {
+      renderHook(() =>
+        useSetInitialValue({
+          localStorageValue: 'initial value',
+          setValue: setValueMock,
+          toasts: toastsMock,
+        })
+      );
+    });
+
+    expect(fetch).not.toHaveBeenCalled();
+    expect(addWarningMock).toHaveBeenCalledWith(
+      'Only URLs with the Elastic domain (www.elastic.co) can be loaded in Console.'
+    );
+  });
+
+  it('should load and decompress data from a data URI', async () => {
+    Object.defineProperty(window, 'location', {
+      writable: true,
+      value: {
+        hash: '?load_from=data:text/plain,compressed-data',
+      },
+    });
+    (decompressFromEncodedURIComponent as jest.Mock).mockReturnValue('decompressed data');
+
+    await act(async () => {
+      renderHook(() =>
+        useSetInitialValue({
+          localStorageValue: 'initial value',
+          setValue: setValueMock,
+          toasts: toastsMock,
+        })
+      );
+    });
+
+    expect(decompressFromEncodedURIComponent).toHaveBeenCalledWith('compressed-data');
+    // The initial value in the editor should be replaces with the decompressed data
+    expect(setValueMock).toHaveBeenCalledWith('decompressed data');
+  });
+
+  it('should show a warning if decompressing a data URI fails', async () => {
+    Object.defineProperty(window, 'location', {
+      writable: true,
+      value: {
+        hash: '?load_from=data:text/plain,invalid-data',
+      },
+    });
+    (decompressFromEncodedURIComponent as jest.Mock).mockReturnValue(null);
+
+    await act(async () => {
+      renderHook(() =>
+        useSetInitialValue({
+          localStorageValue: 'initial value',
+          setValue: setValueMock,
+          toasts: toastsMock,
+        })
+      );
+    });
+
+    expect(addWarningMock).toHaveBeenCalledWith(
+      'Unable to load data from the load_from query parameter in the URL'
+    );
+  });
+});

src/plugins/console/public/application/containers/editor/hooks/use_set_initial_value.ts

@@ -12,7 +12,7 @@ import { parse } from 'query-string';
 import { IToasts } from '@kbn/core-notifications-browser';
 import { decompressFromEncodedURIComponent } from 'lz-string';
 import { i18n } from '@kbn/i18n';
-import { useEffect } from 'react';
+import { useEffect, useRef } from 'react';
 import { DEFAULT_INPUT_VALUE } from '../../../../../common/constants';
 
 interface QueryParams {
@@ -46,6 +46,7 @@ export const readLoadFromParam = () => {
  */
 export const useSetInitialValue = (params: SetInitialValueParams) => {
   const { localStorageValue, setValue, toasts } = params;
+  const isInitialValueSet = useRef<boolean>(false);
 
   useEffect(() => {
     const loadBufferFromRemote = async (url: string) => {
@@ -104,11 +105,15 @@ export const useSetInitialValue = (params: SetInitialValueParams) => {
 
     const loadFromParam = readLoadFromParam();
 
-    if (loadFromParam) {
-      loadBufferFromRemote(loadFromParam);
-    } else {
-      // Only set to default input value if the localstorage value is undefined
-      setValue(localStorageValue ?? DEFAULT_INPUT_VALUE);
+    // Only set the value in the editor if an initial value hasn't been set yet
+    if (!isInitialValueSet.current) {
+      if (loadFromParam) {
+        loadBufferFromRemote(loadFromParam);
+      } else {
+        // Only set to default input value if the localstorage value is undefined
+        setValue(localStorageValue ?? DEFAULT_INPUT_VALUE);
+      }
+      isInitialValueSet.current = true;
     }
 
     return () => {