hellojs-xiaotian/src/hello.chromeapp.js

A clientside Javascript library for standardizing requests to OAuth2 web services (and OAuth1 - with a shim)

// Script to support ChromeApps
// This overides the hello.utils.popup method to support chrome.identity.launchWebAuthFlow
// See https://developer.chrome.com/apps/app_identity#non

// Is this a chrome app?

if (typeof chrome === 'object' && typeof chrome.identity === 'object' && chrome.identity.launchWebAuthFlow) {

	(function() {

		// Swap the popup method
		hello.utils.popup = function(url) {

			return _open(url, true);

		};

		// Swap the hidden iframe method
		hello.utils.iframe = function(url) {

			_open(url, false);

		};

		// Swap the request_cors method
		hello.utils.request_cors = function(callback) {

			callback();

			// Always run as CORS

			return true;
		};

		// Swap the storage method
		var _cache = {};
		chrome.storage.local.get('hello', function(r) {
			// Update the cache
			_cache = r.hello || {};
		});

		hello.utils.store = function(name, value) {

			// Get all
			if (arguments.length === 0) {
				return _cache;
			}

			// Get
			if (arguments.length === 1) {
				return _cache[name] || null;
			}

			// Set
			if (value) {
				_cache[name] = value;
				chrome.storage.local.set({hello: _cache});
				return value;
			}

			// Delete
			if (value === null) {
				delete _cache[name];
				chrome.storage.local.set({hello: _cache});
				return null;
			}
		};

		// Open function
		function _open(url, interactive) {

			// Launch
			var ref = {
				closed: false
			};

			// Launch the webAuthFlow
			chrome.identity.launchWebAuthFlow({
				url: url,
				interactive: interactive
			}, function(responseUrl) {

				// Did the user cancel this prematurely
				if (responseUrl === undefined) {
					ref.closed = true;
					return;
				}

				// Split appart the URL
				var a = hello.utils.url(responseUrl);

				// The location can be augmented in to a location object like so...
				// We dont have window operations on the popup so lets create some
				var _popup = {
					location: {

						// Change the location of the popup
						assign: function(url) {

							// If there is a secondary reassign
							// In the case of OAuth1
							// Trigger this in non-interactive mode.
							_open(url, false);
						},

						search: a.search,
						hash: a.hash,
						href: a.href
					},
					close: function() {}
				};

				// Then this URL contains information which HelloJS must process
				// URL string
				// Window - any action such as window relocation goes here
				// Opener - the parent window which opened this, aka this script

				hello.utils.responseHandler(_popup, window);
			});

			// Return the reference
			return ref;
		}

	})();
}