sandbox - expose limited IPC via preload script

src/vs/code/electron-browser/workbench/preload.js

@@ -0,0 +1,61 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// @ts-check
+(function () {
+	'use strict';
+
+	const { ipcRenderer } = require('electron');
+
+	/**
+	 * @param {string} channel
+	 */
+	function validateIPC(channel) {
+		if (!channel || !channel.startsWith('vscode:')) {
+			throw new Error(`Unsupported event IPC channel '${channel}'`);
+		}
+	}
+
+	// @ts-ignore
+	window.vscode = {
+
+		/**
+		 * A minimal set of methods exposed from ipcRenderer
+		 * to support communication to electron-main
+		 */
+		ipcRenderer: {
+
+			/**
+			 * @param {string} channel
+			 * @param {any[]} args
+			 */
+			send(channel, ...args) {
+				validateIPC(channel);
+
+				ipcRenderer.send(channel, ...args);
+			},
+
+			/**
+			 * @param {string} channel
+			 * @param {(event: import('electron').IpcRendererEvent, ...args: any[]) => void} listener
+			 */
+			on(channel, listener) {
+				validateIPC(channel);
+
+				ipcRenderer.on(channel, listener);
+			},
+
+			/**
+			 * @param {string} channel
+			 * @param {(event: import('electron').IpcRendererEvent, ...args: any[]) => void} listener
+			 */
+			removeListener(channel, listener) {
+				validateIPC(channel);
+
+				ipcRenderer.removeListener(channel, listener);
+			}
+		}
+	};
+}());