appId service and removed unnecessary permissions from manifest

src/background.js

@@ -8,6 +8,7 @@ var folderService = new FolderService(cryptoService, userService, apiService);
 var syncService = new SyncService(siteService, folderService, userService, apiService);
 var autofillService = new AutofillService();
 var passwordGenerationService = new PasswordGenerationService();
+var appIdService = new AppIdService();
 
 function buildContextMenu() {
     chrome.contextMenus.removeAll();

src/manifest.json

@@ -60,13 +60,9 @@
   },
   "permissions": [
     "tabs",
-    "idle",
-    "notifications",
     "contextMenus",
     "storage",
     "unlimitedStorage",
-    "webRequest",
-    "webRequestBlocking",
     "http://*/*",
     "https://*/*"
   ],

src/popup/app/services/backgroundService.js

@@ -33,4 +33,7 @@
     })
     .factory('utilsService', function () {
         return chrome.extension.getBackgroundPage().utilsService;
+    })
+    .factory('appIdService', function () {
+        return chrome.extension.getBackgroundPage().appIdService;
     });

src/services/appIdService.js

@@ -0,0 +1,44 @@
+function AppIdService() {
+    initAppIdService();
+};
+
+function initAppIdService() {
+    AppIdService.prototype.getAppId = function (callback) {
+        if (!callback || typeof callback !== 'function') {
+            throw 'callback function required';
+        }
+
+        makeAndGetAppId('appId');
+    };
+
+    AppIdService.prototype.getAnonymousAppId = function (callback) {
+        if (!callback || typeof callback !== 'function') {
+            throw 'callback function required';
+        }
+
+        makeAndGetAppId('anonymousAppId');
+    };
+
+    function makeAndGetAppId(key) {
+        chrome.storage.local.get(key, function (obj) {
+            if (obj && obj[key]) {
+                callback(obj[key]);
+                return;
+            }
+
+            var setObj = {};
+            setObj[key] = newGuid();
+            chrome.storage.local.set(setObj, function () {
+                callback(setObj[key]);
+            });
+        });
+    }
+
+    // ref: http://stackoverflow.com/a/2117523/1090359
+    function newGuid() {
+        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+            var r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
+            return v.toString(16);
+        });
+    }
+};