[NaCl SDK] Google Drive example

native_client_sdk/src/examples/demo/drive/example.js

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+"use strict";
+
+var authToken = '';
+
+function getAuthToken(interactive) {
+  chrome.experimental.identity.getAuthToken(
+      {'interactive': interactive}, onGetAuthToken);
+}
+
+function onGetAuthToken(authToken) {
+  var signInEl = document.getElementById('signIn');
+  var getFileEl = document.getElementById('getFile');
+  if (authToken) {
+    signInEl.setAttribute('hidden');
+    getFileEl.removeAttribute('hidden');
+    window.authToken =  authToken;
+
+    // Send the auth token to the NaCl module.
+    common.naclModule.postMessage('token:'+authToken);
+  } else {
+    // There is no auth token; this means that the user has yet to authorize
+    // this app. Display a button to let the user sign in and authorize this
+    // application.
+    signInEl.removeAttribute('hidden');
+    getFileEl.setAttribute('hidden');
+  }
+};
+
+// Called by the common.js module.
+function moduleDidLoad() {
+  // The module is not hidden by default so we can easily see if the plugin
+  // failed to load.
+  common.hideModule();
+
+  // Make sure this example is running as a packaged app. If not, display a
+  // warning.
+  if (!chrome.experimental) {
+    common.updateStatus('Error: must be run as a packged app.');
+    return;
+  }
+
+  // Try to get the authorization token non-interactively. This will often work
+  // if the user has already authorized the app, and the token is cached.
+  getAuthToken(false);
+}
+
+function handleMessage(e) {
+  var msg = e.data;
+  document.getElementById('contents').textContent = msg;
+}
+
+// Called by the common.js module.
+function attachListeners() {
+  document.getElementById('signIn').addEventListener('click', function () {
+    // Get the authorization token interactively. A dialog box will pop up
+    // asking the user to authorize access to their Drive account.
+    getAuthToken(true);
+  });
+
+  document.getElementById('getFile').addEventListener('click', function () {
+    // Clear the file contents dialog box.
+    document.getElementById('contents').textContent = '';
+
+    common.naclModule.postMessage('getFile');
+  });
+}