feat(office): Preview PDF rep if using internet explorer

src/i18n/en-US.properties

@@ -88,6 +88,8 @@ error_bad_file=We’re sorry the preview didn’t load. This file could not be c
 error_not_downloadable=Oops! It looks like something is wrong with this file. We apologize for the inconvenience and recommend that you upload a new version of this file or roll back to a previous version. Please contact us for more details.
 # Preview error message shown when flash is not enabled on their browser
 error_flash_not_enabled=We’re sorry, the preview didn’t load because Flash is not enabled on your browser. If possible, please enable Flash and refresh the page.
+# Preview error message shown when loading what would be an Office Excel Online file extension in Internet Explorer
+error_internet_explorer_office_online=Microsoft 365 apps and services no longer support Internet Explorer 11, therefore, Box users may have a degraded experience.
 
 # Archive Preview
 # Label for filename column name

src/lib/Browser.js

@@ -352,6 +352,14 @@ class Browser {
             },
         };
     }
+
+    /**
+     * Returns whether the browser is Internet Explorer
+     * @returns {boolean} - Whether the browser is Internet Explorer
+     */
+    static isIE() {
+        return Browser.getName() === BROWSERS.INTERNET_EXPLORER;
+    }
 }
 
 export default Browser;

src/lib/viewers/doc/DocumentViewer.js

@@ -1,6 +1,8 @@
+import Browser from '../../Browser';
 import DocBaseViewer from './DocBaseViewer';
 import DocPreloader from './DocPreloader';
 import fullscreen from '../../Fullscreen';
+import { EXCEL_EXTENSIONS } from '../../extensions';
 import './Document.scss';
 
 class DocumentViewer extends DocBaseViewer {
@@ -33,6 +35,20 @@ class DocumentViewer extends DocBaseViewer {
         this.preloader.removeAllListeners('preload');
     }
 
+    /**
+     * @inheritdoc
+     */
+    load() {
+        super.load();
+
+        const { extension } = this.options.file;
+        const isExcelExtension = EXCEL_EXTENSIONS.includes(extension);
+
+        if (isExcelExtension && Browser.isIE()) {
+            this.options.ui.showNotification(__('error_internet_explorer_office_online'), null, true);
+        }
+    }
+
     /**
      * Handles keyboard events for document viewer.
      *

src/lib/viewers/doc/__tests__/DocumentViewer-test.js

@@ -1,4 +1,6 @@
 /* eslint-disable no-unused-expressions */
+import Api from '../../../api';
+import Browser from '../../../Browser';
 import DocumentViewer from '../DocumentViewer';
 import DocBaseViewer from '../DocBaseViewer';
 import BaseViewer from '../../BaseViewer';
@@ -15,6 +17,8 @@ describe('lib/viewers/doc/DocumentViewer', () => {
     beforeEach(() => {
         fixture.load('viewers/doc/__tests__/DocumentViewer-test.html');
 
+        stubs.api = new Api();
+
         containerEl = document.querySelector('.container');
         doc = new DocumentViewer({
             container: containerEl,
@@ -83,6 +87,76 @@ describe('lib/viewers/doc/DocumentViewer', () => {
         });
     });
 
+    describe('load()', () => {
+        const docBaseLoadFunc = DocBaseViewer.prototype.load;
+
+        beforeEach(() => {
+            jest.spyOn(stubs.api, 'get').mockImplementation();
+            jest.spyOn(doc, 'setup').mockImplementation();
+            Object.defineProperty(DocBaseViewer.prototype, 'load', {
+                value: jest.fn().mockImplementation(() => Promise.resolve()),
+            });
+            jest.spyOn(doc, 'createContentUrlWithAuthParams').mockImplementation();
+            jest.spyOn(doc, 'handleAssetAndRepLoad').mockImplementation();
+            jest.spyOn(doc, 'getRepStatus').mockReturnValue({ getPromise: () => Promise.resolve() });
+            jest.spyOn(doc, 'loadAssets').mockImplementation();
+            jest.spyOn(doc, 'loadBoxAnnotations').mockImplementation();
+        });
+
+        afterEach(() => {
+            Object.defineProperty(DocBaseViewer.prototype, 'load', { value: docBaseLoadFunc });
+        });
+
+        test.each(['xls', 'xlsm', 'xlsx'])(
+            'should show notification if file has excel extension %s and is internet explorer',
+            extension => {
+                const showNotification = jest.fn();
+                doc.options.ui = { showNotification };
+                doc.options.file.extension = extension;
+                jest.spyOn(Browser, 'isIE').mockImplementation(() => true);
+
+                doc.load();
+
+                expect(showNotification).toBeCalledWith(__('error_internet_explorer_office_online'), null, true);
+            },
+        );
+
+        test.each(['xls', 'xlsm', 'xlsx'])(
+            'should not show notification if file has excel extension %s but is not internet explorer',
+            extension => {
+                const showNotification = jest.fn();
+                doc.options.ui = { showNotification };
+                doc.options.file.extension = extension;
+                jest.spyOn(Browser, 'isIE').mockImplementation(() => false);
+
+                doc.load();
+
+                expect(showNotification).not.toBeCalledWith(__('error_internet_explorer_office_online'), null, true);
+            },
+        );
+
+        test('should not show notification if file is not excel extension', () => {
+            const showNotification = jest.fn();
+            doc.options.ui = { showNotification };
+            doc.options.file.extension = 'pdf';
+
+            doc.load();
+
+            expect(showNotification).not.toBeCalledWith(__('error_internet_explorer_office_online'), null, true);
+        });
+
+        test('should not show notification if file is not excel extension and is internet explorer', () => {
+            const showNotification = jest.fn();
+            doc.options.ui = { showNotification };
+            doc.options.file.extension = 'pdf';
+            jest.spyOn(Browser, 'isIE').mockImplementation(() => true);
+
+            doc.load();
+
+            expect(showNotification).not.toBeCalledWith(__('error_internet_explorer_office_online'), null, true);
+        });
+    });
+
     describe('onKeydown()', () => {
         beforeEach(() => {
             stubs.zoomIn = jest.spyOn(doc, 'zoomIn').mockImplementation();

src/lib/viewers/office/OfficeLoader.js

@@ -1,5 +1,6 @@
 import getProp from 'lodash/get';
 import AssetLoader from '../AssetLoader';
+import Browser from '../../Browser';
 import OfficeViewer from './OfficeViewer';
 import { checkPermission } from '../../file';
 import { ORIGINAL_REP_NAME, PERMISSION_DOWNLOAD } from '../../constants';
@@ -39,7 +40,8 @@ class OfficeLoader extends AssetLoader {
         if (
             !checkPermission(file, PERMISSION_DOWNLOAD) ||
             file.size > maxFileSize ||
-            isDisabledDueToPasswordProtectedSharedLink
+            isDisabledDueToPasswordProtectedSharedLink ||
+            Browser.isIE() // Disable Office viewer if browser is Internet Explorer due to EOL
         ) {
             disabledViewers.push(OFFICE_VIEWER_NAME);
         }

src/lib/viewers/office/__tests__/OfficeLoader-test.js

@@ -1,6 +1,7 @@
+import * as file from '../../../file';
+import Browser from '../../../Browser';
 import OfficeLoader from '../OfficeLoader';
 import OfficeViewer from '../OfficeViewer';
-import * as file from '../../../file';
 
 const FIVE_MB = 5242880;
 
@@ -86,6 +87,12 @@ describe('lib/viewers/office/OfficeLoader', () => {
                 const viewer = OfficeLoader.determineViewer(editedFakeFile, [], viewerOptions);
                 expect(viewer).toBeDefined();
             });
+
+            test('should not return a viewer if the browser is internet explorer', () => {
+                jest.spyOn(Browser, 'isIE').mockImplementation(() => true);
+                const viewer = OfficeLoader.determineViewer(fakeFile, []);
+                expect(viewer).toBeUndefined();
+            });
         });
     });
 });