Move SQL 2019 extension's notebook code into Azure Data Studio (#4090)

extensions/notebook/src/common/notebookUtils.ts

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as crypto from 'crypto';
+
+/**
+ * Creates a random token per https://nodejs.org/api/crypto.html#crypto_crypto_randombytes_size_callback.
+ * Defaults to 24 bytes, which creates a 48-char hex string
+ */
+export function getRandomToken(size: number = 24): Promise<string> {
+	return new Promise((resolve, reject) => {
+		crypto.randomBytes(size, (err, buffer) => {
+			if (err) {
+				reject(err);
+			}
+			let token = buffer.toString('hex');
+			resolve(token);
+		});
+	});
+}