ES6: Migrated "auth" directory

.eslintrc.yaml

@@ -15,6 +15,8 @@ globals:
   it: true
   ko: true
   LRUCache: true
+  pako: true
+  Raygun: true
   wire: true
   z: true
 

app/script/auth/AccessTokenError.js

@@ -0,0 +1,62 @@
+/*
+ * Wire
+ * Copyright (C) 2016 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+'use strict';
+
+window.z = window.z || {};
+window.z.auth = z.audio || {};
+
+window.z.auth.AccessTokenError = class AccessTokenError extends Error {
+  constructor(type) {
+    super();
+    this.name = this.constructor.name;
+    this.stack = (new Error()).stack;
+    this.type = type || z.audio.AccessTokenError.TYPE.UNKNOWN;
+
+    switch (this.type) {
+      case z.auth.AccessTokenError.TYPE.NOT_FOUND_IN_CACHE:
+        this.message = 'No cached access token found in Local Storage';
+        break;
+      case z.auth.AccessTokenError.TYPE.REFRESH_IN_PROGRESS:
+        this.message = 'Access Token request already in progress';
+        break;
+      case z.auth.AccessTokenError.TYPE.RETRIES_EXCEEDED:
+        this.message = 'No. of retries to get Access Token exceeded';
+        break;
+      case z.auth.AccessTokenError.TYPE.REQUEST_FAILED:
+        this.message = 'Request to POST for access token failed';
+        break;
+      case z.auth.AccessTokenError.TYPE.REQUEST_FORBIDDEN:
+        this.message = 'Request to POST for access token forbidden';
+        break;
+    }
+  }
+
+  static get TYPE() {
+    return {
+      NOT_FOUND_IN_CACHE: 'z.auth.AccessTokenError.TYPE.NOT_FOUND_IN_CACHE',
+      REFRESH_IN_PROGRESS: 'z.auth.AccessTokenError.TYPE.REFRESH_IN_PROGRESS',
+      REQUEST_FAILED: 'z.auth.AccessTokenError.TYPE.REQUEST_FAILED',
+      REQUEST_FORBIDDEN: 'z.auth.AccessTokenError.TYPE.REQUEST_FORBIDDEN',
+      RETRIES_EXCEEDED: 'z.auth.AccessTokenError.TYPE.RETRIES_EXCEEDED',
+    };
+  }
+};
+
+