From dcf95410d72c0af6df7b7b411bb622097a2cb0b3 Mon Sep 17 00:00:00 2001
From: SleepWalker <mybox@udf.su>
Date: Tue, 11 Apr 2017 22:18:27 +0300
Subject: [PATCH] #316: add localStorage wrapper with feature detection

---
 .eslintrc.json                    |  4 ++++
 src/components/auth/actions.js    |  1 +
 src/services/authFlow/AuthFlow.js |  1 +
 src/services/localStorage.js      | 40 +++++++++++++++++++++++++++++++
 4 files changed, 46 insertions(+)
 create mode 100644 src/services/localStorage.js

diff --git a/.eslintrc.json b/.eslintrc.json
index 52b86a3..040f151 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -113,6 +113,10 @@
         "no-undef-init": "error",
         "no-undef": "error",
         "no-use-before-define": ["warn", "nofunc"],
+        "no-restricted-globals": ["error",
+            "localStorage", "sessionStorage", // we have our own localStorage module
+            "event"
+        ],
 
         // CommonJS
         "no-mixed-requires": "warn",
diff --git a/src/components/auth/actions.js b/src/components/auth/actions.js
index 58f78bb..68701df 100644
--- a/src/components/auth/actions.js
+++ b/src/components/auth/actions.js
@@ -1,6 +1,7 @@
 import { routeActions } from 'react-router-redux';
 
 import logger from 'services/logger';
+import localStorage from 'services/localStorage';
 import loader from 'services/loader';
 import history from 'services/history';
 import { updateUser, acceptRules as userAcceptRules } from 'components/user/actions';
diff --git a/src/services/authFlow/AuthFlow.js b/src/services/authFlow/AuthFlow.js
index 75806c1..2ed6fb8 100644
--- a/src/services/authFlow/AuthFlow.js
+++ b/src/services/authFlow/AuthFlow.js
@@ -1,6 +1,7 @@
 import { routeActions } from 'react-router-redux';
 
 import logger from 'services/logger';
+import localStorage from 'services/localStorage';
 
 import RegisterState from './RegisterState';
 import LoginState from './LoginState';
diff --git a/src/services/localStorage.js b/src/services/localStorage.js
new file mode 100644
index 0000000..bc3e98b
--- /dev/null
+++ b/src/services/localStorage.js
@@ -0,0 +1,40 @@
+import logger from 'services/logger';
+
+let _hasStorage = false;
+
+try {
+    const test = 'test';
+    window.localStorage.setItem(test, test);
+    window.localStorage.removeItem(test);
+
+    _hasStorage = true;
+} catch (err) {
+    // bad luck, no storage available
+    logger.info('No storage available'); // log for statistic purposes
+}
+
+export function hasStorage() {
+    return _hasStorage;
+}
+
+function DummyStorage() {
+    return {
+        getItem(key) {
+            return this[key] || null;
+        },
+
+        setItem(key, value) {
+            this[key] = value;
+        },
+
+        removeItem(key) {
+            Reflect.deleteProperty(this, key);
+        }
+    };
+}
+
+export const localStorage = _hasStorage ? window.localStorage : new DummyStorage();
+
+export const sessionStorage = _hasStorage ? window.sessionStorage : new DummyStorage();
+
+export default localStorage;