Maintenance: Replaced not used list method by introducing keys method of App.LocalStorage to support deleting all keys for a certain user only.

app/assets/javascripts/app/lib/app_init/local_storage.coffee

@@ -21,10 +21,10 @@ class App.LocalStorage
       _instance ?= new _storeSingleton
     _instance.clear()
 
-  @list: ->
+  @keys: (prefix, user_id) ->
     if _instance == undefined
       _instance ?= new _storeSingleton
-    _instance.list()
+    _instance.keys(prefix, user_id)
 
   @usage: ->
     if _instance == undefined
@@ -63,8 +63,24 @@ class _storeSingleton
     localStorage.clear()
 
   # return list of all keys
-  list: ->
+  keys: (prefix, user_id) ->
-    window.localStorage
+    allKeys = Object.keys(window.localStorage)
+
+    if user_id is null and prefix is null
+      return allKeys
+
+    startingWith = ''
+
+    if user_id
+      startingWith = "personal::#{user_id}::"
+
+    if prefix
+      startingWith += prefix
+
+    regexp = new RegExp('^' + startingWith)
+
+    allKeys.filter (elem) -> elem.match(regexp)
+
 
   # get usage
   usage: ->

public/assets/tests/local_storage.js

@@ -27,4 +27,39 @@ test('Test user-specific item removal from local storage', function() {
   equal(App.LocalStorage.get(key, user_id), undefined)
 });
 
+test('Test key lookup', function() {
+  App.LocalStorage.clear()
+
+  var key     = 'test_key_3'
+  var value   = 'test_value_3'
+  var user_id = 2
+  var alt_key = 'test_alt_key_3'
+
+  // verify no keys initially
+  equal(App.LocalStorage.keys().length, 0)
+
+  App.LocalStorage.set(key, value, user_id)
+
+  // has 1 key in total
+  equal(App.LocalStorage.keys().length, 1)
+
+  // doesn't return anything with wrong prefix
+  equal(App.LocalStorage.keys('a').length, 0)
+
+  // doesn't return anything since user id not given
+  equal(App.LocalStorage.keys('test').length, 0)
+
+  // correct
+  equal(App.LocalStorage.keys('test', user_id).length, 1)
+
+  // verify value
+  equal(App.LocalStorage.keys('test', user_id)[0].match(key + '$'), key)
+
+  App.LocalStorage.set(alt_key, value)
+
+  // returns 1 key without user id
+  equal(App.LocalStorage.keys('test').length, 1)
+  equal(App.LocalStorage.keys('test')[0], alt_key)
+});
+
 }