Add trusted indicator

packages/notebook-extension/src/index.ts

@@ -34,6 +34,8 @@ import { Poll } from '@lumino/polling';
 
 import { Widget } from '@lumino/widgets';
 
+import { TrustedComponent } from './trusted';
+
 /**
  * The class for kernel status errors.
  */
@@ -364,6 +366,35 @@ const notebookToolsWidget: JupyterFrontEndPlugin<void> = {
   }
 };
 
+/**
+ * A plugin that adds a Trusted indicator to the menu area
+ */
+const trusted: JupyterFrontEndPlugin<void> = {
+  id: '@jupyter-notebook/notebook-extension:trusted',
+  autoStart: true,
+  requires: [INotebookShell, ITranslator],
+  activate: (
+    app: JupyterFrontEnd,
+    notebookShell: INotebookShell,
+    translator: ITranslator
+  ): void => {
+    const onChange = async () => {
+      const current = notebookShell.currentWidget;
+      if (!(current instanceof NotebookPanel)) {
+        return;
+      }
+
+      const notebook = current.content;
+      await current.context.ready;
+
+      const widget = TrustedComponent.create({ notebook, translator });
+      notebookShell.add(widget, 'menu', { rank: 11_000 });
+    };
+
+    notebookShell.currentChanged.connect(onChange);
+  }
+};
+
 /**
  * Export the plugins as default.
  */
@@ -372,7 +403,8 @@ const plugins: JupyterFrontEndPlugin<any>[] = [
   kernelLogo,
   kernelStatus,
   scrollOutput,
-  notebookToolsWidget
+  notebookToolsWidget,
+  trusted
 ];
 
 export default plugins;

packages/notebook-extension/src/trusted.tsx

@@ -0,0 +1,107 @@
+import { ReactWidget } from '@jupyterlab/apputils';
+
+import { Notebook, NotebookActions } from '@jupyterlab/notebook';
+
+import { ITranslator } from '@jupyterlab/translation';
+
+import { toArray } from '@lumino/algorithm';
+
+import React, { useEffect, useState } from 'react';
+
+/**
+ * Check if a notebook is trusted
+ * @param notebook The notebook to check
+ * @returns true if the notebook is trusted, false otherwise
+ */
+const isTrusted = (notebook: Notebook): boolean => {
+  const model = notebook.model;
+  if (!model) {
+    return false;
+  }
+  const cells = toArray(model.cells);
+
+  const trusted = cells.reduce((accum, current) => {
+    if (current.trusted) {
+      return accum + 1;
+    } else {
+      return accum;
+    }
+  }, 0);
+
+  const total = cells.length;
+  return trusted === total;
+};
+
+/**
+ * A React component to display the Trusted badge in the menu bar.
+ * @param notebook The Notebook
+ * @param translator The Translation service
+ */
+const TrustedButton = ({
+  notebook,
+  translator
+}: {
+  notebook: Notebook;
+  translator: ITranslator;
+}): JSX.Element => {
+  const trans = translator.load('notebook');
+  const [trusted, setTrusted] = useState(isTrusted(notebook));
+
+  const checkTrust = () => {
+    const v = isTrusted(notebook);
+    setTrusted(v);
+  };
+
+  const trust = async () => {
+    await NotebookActions.trust(notebook, translator);
+    checkTrust();
+  };
+
+  useEffect(() => {
+    notebook.modelContentChanged.connect(checkTrust);
+    notebook.activeCellChanged.connect(checkTrust);
+    checkTrust();
+    return () => {
+      notebook.modelContentChanged.disconnect(checkTrust);
+      notebook.activeCellChanged.disconnect(checkTrust);
+    };
+  });
+
+  return (
+    <button
+      className={'jp-NotebookTrustedStatus'}
+      style={!trusted ? { cursor: 'pointer' } : { cursor: 'help' }}
+      onClick={() => !trusted && trust()}
+      title={
+        trusted
+          ? trans.__('JavaScript enabled for notebook display')
+          : trans.__('JavaScript disabled for notebook display')
+      }
+    >
+      {trusted ? trans.__('Trusted') : trans.__('Not Trusted')}
+    </button>
+  );
+};
+
+/**
+ * A namespace for TrustedComponent statics.
+ */
+export namespace TrustedComponent {
+  /**
+   * Create a new TrustedComponent
+   *
+   * @param notebook The notebook
+   * @param translator The translator
+   */
+  export const create = ({
+    notebook,
+    translator
+  }: {
+    notebook: Notebook;
+    translator: ITranslator;
+  }): ReactWidget => {
+    return ReactWidget.create(
+      <TrustedButton notebook={notebook} translator={translator} />
+    );
+  };
+}

packages/notebook-extension/style/base.css

@@ -220,6 +220,19 @@ body[data-notebook='notebooks']
   animation: 0.5s fade-out forwards;
 }
 
+.jp-NotebookTrustedStatus {
+  background: var(--jp-layout-color1);
+  color: var(--jp-ui-font-color1);
+  margin-top: 4px;
+  margin-bottom: 4px;
+  border: solid 1px var(--jp-border-color2);
+  cursor: help;
+}
+
+.jp-NotebookTrustedStatus-not-trusted {
+  cursor: pointer;
+}
+
 @keyframes fade-out {
   0% {
     opacity: 1;