1 files changed, 28 insertions, 9 deletions

diff --git a/web/react/stores/browser_store.jsx b/web/react/stores/browser_store.jsx
index 75fb8aa3c..8e86ce32f 100644
--- a/web/react/stores/browser_store.jsx
+++ b/web/react/stores/browser_store.jsx
@@ -24,11 +24,17 @@ class BrowserStoreClass {
         this.setLastServerVersion = this.setLastServerVersion.bind(this);
         this.clear = this.clear.bind(this);
         this.clearAll = this.clearAll.bind(this);
+        this.checkedLocalStorageSupported = '';
+        this.signalLogout = this.signalLogout.bind(this);
 
         var currentVersion = sessionStorage.getItem('storage_version');
         if (currentVersion !== global.window.mm_config.Version) {
             sessionStorage.clear();
-            sessionStorage.setItem('storage_version', global.window.mm_config.Version);
+            try {
+                sessionStorage.setItem('storage_version', global.window.mm_config.Version);
+            } catch (e) {
+                // Do nothing
+            }
         }
     }
 
@@ -105,6 +111,13 @@ class BrowserStoreClass {
         sessionStorage.setItem('last_server_version', version);
     }
 
+    signalLogout() {
+        if (this.isLocalStorageSupported()) {
+            localStorage.setItem('__logout__', 'yes');
+            localStorage.removeItem('__logout__');
+        }
+    }
+
     /**
      * Preforms the given action on each item that has the given prefix
      * Signature for action is action(key, value)
@@ -147,20 +160,26 @@ class BrowserStoreClass {
     }
 
     isLocalStorageSupported() {
+        if (this.checkedLocalStorageSupported !== '') {
+            return this.checkedLocalStorageSupported;
+        }
+
         try {
-            sessionStorage.setItem('testSession', '1');
-            sessionStorage.removeItem('testSession');
+            sessionStorage.setItem('__testSession__', '1');
+            sessionStorage.removeItem('__testSession__');
 
-            localStorage.setItem('testLocal', '1');
-            if (localStorage.getItem('testLocal') !== '1') {
-                return false;
+            localStorage.setItem('__testLocal__', '1');
+            if (localStorage.getItem('__testLocal__') !== '1') {
+                this.checkedLocalStorageSupported = false;
             }
-            localStorage.removeItem('testLocal', '1');
+            localStorage.removeItem('__testLocal__', '1');
 
-            return true;
+            this.checkedLocalStorageSupported = true;
         } catch (e) {
-            return false;
+            this.checkedLocalStorageSupported = false;
         }
+
+        return this.checkedLocalStorageSupported;
     }
 }