more services and async callthroughs for vault list/add

src/services/folderService.js

@@ -0,0 +1,50 @@
+function FolderService(cryptoService, userService, apiService) {
+    this.cryptoService = cryptoService;
+    this.userService = userService;
+    this.apiService = apiService;
+
+    initFolderService();
+};
+
+function initFolderService() {
+    this.userService.getUserId(function (userId) {
+        var foldersKey = 'folders_' + userId;
+
+        FolderService.prototype.get = function (id, callback) {
+            if (!callback || typeof callback !== 'function') {
+                throw 'callback function required';
+            }
+
+            chrome.storage.local.get(foldersKey, function (obj) {
+                var folders = obj[foldersKey];
+                if (id in folders) {
+                    callback(new Folder(folders[id]));
+                    return;
+                }
+
+                callback(null);
+            });
+        };
+
+        FolderService.prototype.getAll = function (callback) {
+            if (!callback || typeof callback !== 'function') {
+                throw 'callback function required';
+            }
+
+            chrome.storage.local.get(foldersKey, function (obj) {
+                var folders = obj[foldersKey];
+                var response = [];
+                for (var id in folders) {
+                    var folder = folders[id];
+                    response.push(new Folder(folder));
+                }
+
+                callback(response);
+            });
+        };
+
+        function handleError() {
+            // TODO: check for unauth or forbidden and logout
+        }
+    });
+};