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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 'use strict'; | 5 'use strict'; |
6 | 6 |
7 // TODO(vadimt): Remove alerts. | 7 // TODO(vadimt): Remove alerts. |
8 | 8 |
9 /** | 9 /** |
10 * @fileoverview Utility objects and functions for Google Now extension. | 10 * @fileoverview Utility objects and functions for Google Now extension. |
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406 }); | 406 }); |
407 | 407 |
408 return { | 408 return { |
409 start: start, | 409 start: start, |
410 planForNext: planForNext, | 410 planForNext: planForNext, |
411 stop: stop, | 411 stop: stop, |
412 isRunning: isRunning | 412 isRunning: isRunning |
413 }; | 413 }; |
414 } | 414 } |
415 | 415 |
416 // TODO(robliao): Ideally, the authentication watcher infrastructure | |
417 // below would be an API change to chrome.identity. | |
418 // When this happens, remove the code below. | |
419 | |
420 /** | |
421 * Wraps chrome.identity to provide limited listening support for | |
422 * the sign in state by polling periodically for the auth token. | |
423 * @return {Object} The Authentication Manager interface. | |
424 */ | |
425 function buildAuthenticationManager() { | |
426 var alarmName = 'sign-in-alarm'; | |
427 | |
428 /** | |
429 * Determines if the user is signed in and provides a token if signed in. | |
430 * @param {function(string=)} callback Called on completion. | |
431 * If the user is signed in, the string contains the token. | |
432 */ | |
433 function isSignedIn(callback) { | |
434 chrome.identity.getAuthToken({interactive: false}, function(token) { | |
435 token = chrome.runtime.lastError ? undefined : token; | |
436 callback(token); | |
437 checkAndNotifyListeners(!!token); | |
438 }); | |
439 } | |
440 | |
441 /** | |
442 * Removes the specified cached token. | |
443 * @param {string} token Authentication Token to remove from the cache. | |
444 * @param {function} onSuccess Called on completion. | |
445 */ | |
446 function removeToken(token, onSuccess) { | |
447 chrome.identity.removeCachedAuthToken({token: token}, function() { | |
448 // Removing the token from the cache will change the sign in state. | |
449 // Repoll now to check the state and notify listeners. | |
450 // This also lets Chrome now about a possible problem with the token. | |
451 isSignedIn(function() {}); | |
452 onSuccess(); | |
453 }); | |
454 } | |
455 | |
456 var listeners = []; | |
457 | |
458 /** | |
459 * Registers a listener that gets called back when the signed in state | |
460 * is found to be changed. | |
461 * @param {function} callback Called when the answer to isSignedIn changes. | |
462 */ | |
463 function addListener(callback) { | |
464 listeners.push(callback); | |
465 } | |
466 | |
467 // Tracks the last answer of isSignedIn. checkAndNotifyListeners will not | |
468 // notify the listeners if this is null because technically, no sign in | |
469 // state change occurred. | |
470 var lastReturnedSignedInState; | |
xiyuan
2013/07/31 21:17:02
Should we initialize lastReturnedSignedInState to
robliao
2013/07/31 21:31:45
Hrm... a lost delta.
This is supposed to be initi
| |
471 | |
472 function checkAndNotifyListeners(currentSignedInState) { | |
473 if ((lastReturnedSignedInState !== currentSignedInState) && | |
474 (lastReturnedSignedInState !== null)) { | |
475 for (var listenerIndex in listeners) { | |
476 listeners[listenerIndex](); | |
477 } | |
478 } | |
479 lastReturnedSignedInState = currentSignedInState; | |
480 } | |
481 | |
482 chrome.alarms.onAlarm.addListener(function(alarm) { | |
483 if (alarm.name == alarmName) { | |
484 isSignedIn(function() {}); | |
485 } | |
xiyuan
2013/07/31 21:17:02
nit: no {} for one-liner.
robliao
2013/07/31 21:31:45
Done.
| |
486 }); | |
487 | |
488 // Poll for the sign in state every hour. | |
489 // One hour is just an arbitrary amount of time chosen. | |
490 chrome.alarms.create(alarmName, {periodInMinutes: 60}); | |
491 | |
492 return { | |
493 addListener: addListener, | |
494 isSignedIn: isSignedIn, | |
495 removeToken: removeToken | |
496 }; | |
497 } | |
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