Add first cut on persistent stores

js/actions/user_actions.js

@@ -3,6 +3,8 @@
 import { altUser } from '../alt';
 import UserFetcher from '../fetchers/user_fetcher';
 
+import UserStore from '../stores/user_store';
+
 
 class UserActions {
     constructor() {
@@ -22,6 +24,19 @@ class UserActions {
                 this.actions.updateCurrentUser({});
             });
     }
+
+    /*fetchCurrentUser() {
+        if(UserStore.getState().currentUser && !UserStore.getState().currentUser.email) {
+            UserFetcher.fetchOne()
+            .then((res) => {
+                this.actions.updateCurrentUser(res.users[0]);
+            })
+            .catch((err) => {
+                console.logGlobal(err);
+                this.actions.updateCurrentUser({});
+            });
+        }
+    }*/
     
     logoutCurrentUser() {
         UserFetcher.logout()

js/models/ascribe_storage.js

@@ -0,0 +1,98 @@
+'use strict';
+
+import { sanitize } from '../utils/general_utils';
+
+/**
+ * A tiny wrapper around HTML5's `webStorage`,
+ * to enable saving JSON objects directly into `webStorage`
+ */
+export default class AscribeStorage {
+    /**
+     * @param  {String} `name` A unique storage name
+     */
+    constructor(type, name) {
+        if(type === 'localStorage' || type === 'sessionStorage') {
+            this.storage = window[type];
+        } else {
+            throw new Error('"type" can only be either "localStorage" or "sessionStorage"');
+        }
+
+        this.name = name;
+    }
+
+    /**
+     * Private method, do not use from the outside.
+     * Constructs a unique identifier for a item in the global `webStorage`,
+     * by appending the `ÀscribeStorage`'s name
+     * @param  {string} key A unique identifier
+     * @return {string}     A globally unique identifier for a value in `webStorage`
+     */
+    _constructStorageKey(key) {
+        return `${this.name}-${key}`;
+    }
+
+    _deconstructStorageKey(key) {
+        return key.replace(`${this.name}-`, '');
+    }
+
+    /**
+     * Saves a JSON-serializeble object or a string into `webStorage`
+     * @param {string} key   Used as a unique identifier
+     * @param {oneOfType([String, object])} value Either JSON-serializeble or a string
+     */
+    setItem(key, value) {
+        // We're "try-catching" errors in this method ourselves, to be able to
+        // yield more readable error messages
+
+        if(!key || !value) {
+            throw new Error('"key" or "value" cannot be "falsy" values');
+        } else if(typeof value === 'string') {
+            // since `value` is a string, we can directly write
+            // it into `this.storage`
+            this.storage.setItem(this._constructStorageKey(key), value);
+        } else {
+            // if `value` is not a string, we need to JSON-serialize it and then
+            // put it into `this.storage`
+
+            let serializedValue;
+            try {
+                serializedValue = JSON.stringify(value);
+            } catch(err) {
+                throw new Error('You didn\'t pass valid JSON as "value" into setItem.');
+            }
+
+            try {
+                this.storage.setItem(this._constructStorageKey(key), serializedValue);
+            } catch(err) {
+                throw new Error('Failure saving a "serializedValue" in setItem');
+            }
+        }
+    }
+
+    getItem(key) {
+        let deserializedValue;
+        const serializedValue = this.storage.getItem(this._constructStorageKey(key));
+
+        try {
+            deserializedValue = JSON.parse(serializedValue);
+        } catch(err) {
+            deserializedValue = serializedValue;
+        }
+
+        return deserializedValue;
+    }
+
+    toObject() {
+        let obj = {};
+        const storageCopy = JSON.parse(JSON.stringify(this.storage));
+        const sanitizedStore = sanitize(storageCopy, s => !s.match(`${this.name}-`), true);
+        
+        Object
+            .keys(sanitizedStore)
+            .forEach((key) => {
+                obj[this._deconstructStorageKey(key)] = JSON.parse(sanitizedStore[key]);
+            });
+
+        return obj;
+    }
+}

js/stores/session_persistent_store.js

@@ -0,0 +1,21 @@
+'use strict';
+
+import AscribeStorage from '../models/ascribe_storage';
+
+
+export default class SessionPersistentStore extends AscribeStorage {
+    constructor(name) {
+        super('sessionStorage', name);
+    }
+
+    setItem(key, value) {
+        this[key] = value;
+        super.setItem(key, value);
+    }
+}
+
+SessionPersistentStore.config = {
+    getState() {
+        return new AscribeStorage('sessionStorage', this.displayName).toObject();
+    }
+};

js/stores/user_store.js

@@ -3,15 +3,21 @@
 import { altUser } from '../alt';
 import UserActions from '../actions/user_actions';
 
+import SessionPersistentStore from './session_persistent_store';
 
-class UserStore {
+// import AscribeStorage from '../models/ascribe_storage';
+// import { sessionStorageAvailable } from '../utils/feature_detection_utils';
+
+
+class UserStore extends SessionPersistentStore {
     constructor() {
+        super('UserStore');
         this.currentUser = {};
         this.bindActions(UserActions);
     }
 
     onUpdateCurrentUser(user) {
-        this.currentUser = user;
+        this.setItem('currentUser', user);
     }
     onDeleteCurrentUser() {
         this.currentUser = {};

js/utils/feature_detection_utils.js

@@ -51,11 +51,8 @@ function storageAvailable(type) {
 }
 
 /**
- * Function detects whether sessionStorage is both supported
+ * Const that detects whether sessionStorage is both supported
  * and available.
- * @return {bool} Is sessionStorage available on this browser
  */
-export function sessionStorageAvailable() {
+export const sessionStorageAvailable = storageAvailable('sessionStorage');
-    return storageAvailable('sessionStorage');
-}
 

js/utils/general_utils.js

@@ -6,9 +6,12 @@
  * tagged as false by the passed in filter function
  *
  * @param  {object} obj regular javascript object
+ * @param  {function} filterFn a filter function for filtering either by key or value
+ * @param  {bool} filterByKey a boolean for choosing whether the object should be filtered by
+ *                key or value
  * @return {object}     regular javascript object without null values or empty strings
  */
-export function sanitize(obj, filterFn) {
+export function sanitize(obj, filterFn, filterByKey) {
     if(!filterFn) {
         // By matching null with a double equal, we can match undefined and null
         // http://stackoverflow.com/a/15992131
@@ -18,7 +21,9 @@ export function sanitize(obj, filterFn) {
     Object
         .keys(obj)
         .map((key) => {
-            if(filterFn(obj[key])) {
+            const filterCondition = filterByKey ? filterFn(key) : filterFn(obj[key]);
+
+            if(filterCondition) {
                 delete obj[key];
             }
         });