chrome/test/chromedriver/extension/background.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /*
   6  * Checks for an extension error that occurred during the asynchronous call.
   7  * If an error occurs, will invoke the error callback and throw an exception.
   8  *
   9  * @param {function(!Error)} errCallback The callback to invoke for error
  10  *     reporting.
  11  */
  12 function checkForExtensionError(errCallback) {
  13   if (typeof(chrome.extension.lastError) != 'undefined') {
  14     var error = new Error(chrome.extension.lastError.message);
  15     errCallback(error);
  16     throw error;
  17   }
  18 }
  19
  20 /**
  21  * Captures a screenshot of the visible tab.
  22  *
  23  * @param {function(string)} callback The callback to invoke with the base64
  24  *     encoded PNG.
  25  * @param {function(!Error)} errCallback The callback to invoke for error
  26  *     reporting.
  27  */
  28 function captureScreenshot(callback, errCallback) {
  29   chrome.tabs.captureVisibleTab({format:'png'}, function(dataUrl) {
  30     if (chrome.extension.lastError &&
  31         chrome.extension.lastError.message.indexOf('permission') != -1) {
  32       var error = new Error(chrome.extension.lastError.message);
  33       error.code = 103;  // kForbidden
  34       errCallback(error);
  35       return;
  36     }
  37     checkForExtensionError(errCallback);
  38     var base64 = ';base64,';
  39     callback(dataUrl.substr(dataUrl.indexOf(base64) + base64.length))
  40   });
  41 }
  42
  43 /**
  44  * Gets info about the current window.
  45  *
  46  * @param {function(*)} callback The callback to invoke with the window info.
  47  * @param {function(!Error)} errCallback The callback to invoke for error
  48  *     reporting.
  49  */
  50 function getWindowInfo(callback, errCallback) {
  51   chrome.windows.getCurrent({populate: true}, function(window) {
  52     checkForExtensionError(errCallback);
  53     callback(window);
  54   });
  55 }
  56
  57 /**
  58  * Updates the properties of the current window.
  59  *
  60  * @param {Object} updateInfo Update info to pass to chrome.windows.update.
  61  * @param {function()} callback Invoked when the updating is complete.
  62  * @param {function(!Error)} errCallback The callback to invoke for error
  63  *     reporting.
  64  */
  65 function updateWindow(updateInfo, callback, errCallback) {
  66   chrome.windows.getCurrent({}, function(window) {
  67     checkForExtensionError(errCallback);
  68     chrome.windows.update(window.id, updateInfo, function(window) {
  69       checkForExtensionError(errCallback);
  70       callback();
  71     });
  72   });
  73 }
  74
  75 /**
  76  * Launches an app with the specified id.
  77  *
  78  * @param {string} id The ID of the app to launch.
  79  * @param {function()} callback Invoked when the launch event is complete.
  80  * @param {function(!Error)} errCallback The callback to invoke for error
  81  *     reporting.
  82  */
  83 function launchApp(id, callback, errCallback) {
  84   chrome.management.launchApp(id, function() {
  85     checkForExtensionError(errCallback);
  86     callback();
  87   });
  88 }