Cookie fallback for storage

src/helper/cookies.js

@@ -0,0 +1,58 @@
+var windowHandler = require('./window');
+var base64Url = require('./base64_url');
+
+function create(name, value, days) {
+  var date;
+  var expires;
+
+  if (windowHandler.getDocument().cookie === undefined
+      || windowHandler.getDocument().cookie === null) {
+    throw new Error('cookie storage not available');
+  }
+
+  if (days) {
+    date = new Date();
+    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+    expires = '; expires=' + date.toGMTString();
+  } else {
+    expires = '';
+  }
+
+  windowHandler.getDocument().cookie = name + '=' + base64Url.encode(value) + expires + '; path=/';
+}
+
+function read(name) {
+  var i;
+  var cookie;
+  var cookies;
+  var nameEQ = name + '=';
+
+  if (windowHandler.getDocument().cookie === undefined
+      || windowHandler.getDocument().cookie === null) {
+    throw new Error('cookie storage not available');
+  }
+
+  cookies = windowHandler.getDocument().cookie.split(';');
+
+  for (i = 0; i < cookies.length; i++) {
+    cookie = cookies[i];
+    while (cookie.charAt(0) === ' ') {
+      cookie = cookie.substring(1, cookie.length);
+    }
+    if (cookie.indexOf(nameEQ) === 0) {
+      return base64Url.decode(cookie.substring(nameEQ.length, cookie.length));
+    }
+  }
+
+  return null;
+}
+
+function erase(name) {
+  create(name, '', -1);
+}
+
+module.exports = {
+  create: create,
+  read: read,
+  erase: erase
+};

src/helper/storage.js

@@ -1,24 +1,26 @@
-var windowHandler = require('./window');
+var StorageHandler = require('./storage/handler');
+var storage;
 
-function DummyStorage() {}
-DummyStorage.prototype.getItem = function (key) { return null; };
-DummyStorage.prototype.removeItem = function (key) {};
-DummyStorage.prototype.setItem = function (key, value) {};
-
-function getStorage() {
-  return windowHandler.getWindow().localStorage || new DummyStorage();
+function getStorage(force) {
+  if (!storage || force) {
+    storage = new StorageHandler();
+  }
+  return storage;
 }
 
 module.exports = {
   getItem: function (key) {
     var value = getStorage().getItem(key);
-    return JSON.parse(value);
+    return value ? JSON.parse(value) : value;
   },
   removeItem: function (key) {
     return getStorage().removeItem(key);
   },
   setItem: function (key, value) {
     var json = JSON.stringify(value);
     return getStorage().setItem(key, json);
+  },
+  reload: function() {
+    getStorage(true);
   }
 };

src/helper/storage/cookie.js

@@ -0,0 +1,18 @@
+var windowHandler = require('../window');
+var cookies = require('../cookies');
+
+function CookieStorage() {}
+
+CookieStorage.prototype.getItem = function (key) {
+  return cookies.read(key);
+};
+
+CookieStorage.prototype.removeItem = function (key) {
+  cookies.erase(key);
+};
+
+CookieStorage.prototype.setItem = function (key, value) {
+  cookies.create(key, value, 1);
+};
+
+module.exports = CookieStorage;

src/helper/storage/dummy.js

@@ -0,0 +1,9 @@
+function DummyStorage() {}
+
+DummyStorage.prototype.getItem = function (key) { return null; };
+
+DummyStorage.prototype.removeItem = function (key) {};
+
+DummyStorage.prototype.setItem = function (key, value) {};
+
+module.exports = DummyStorage;

src/helper/storage/handler.js

@@ -0,0 +1,54 @@
+var windowHandler = require('../window');
+var DummyStorage = require('./dummy');
+var CookieStorage = require('./cookie');
+var Warn = require('../warn');
+
+function StorageHandler() {
+  this.warn = new Warn({});
+  this.storage = windowHandler.getWindow().localStorage || new CookieStorage();
+}
+
+StorageHandler.prototype.failover = function () {
+  if (this.storage instanceof DummyStorage) {
+    this.warn.warning('DummyStorage: ignore failover');
+    return;
+  } else if (this.storage instanceof CookieStorage) {
+    this.warn.warning('CookieStorage: failing over DummyStorage');
+    this.storage = new DummyStorage();
+  } else {
+    this.warn.warning('LocalStorage: failing over CookieStorage');
+    this.storage = new CookieStorage();
+  }
+};
+
+StorageHandler.prototype.getItem = function (key) {
+  try {
+    return this.storage.getItem(key);
+  } catch (e) {
+    this.warn.warning(e);
+    this.failover();
+    return this.getItem(key);
+  }
+};
+
+StorageHandler.prototype.removeItem = function (key) {
+  try {
+    return this.storage.removeItem(key);
+  } catch (e) {
+    this.warn.warning(e);
+    this.failover();
+    return this.removeItem(key);
+  }
+};
+
+StorageHandler.prototype.setItem = function (key, value) {
+  try {
+    return this.storage.setItem(key, value);
+  } catch (e) {
+    this.warn.warning(e);
+    this.failover();
+    return this.setItem(key, value);
+  }
+};
+
+module.exports = StorageHandler;

test/helper/cookies.test.js

@@ -0,0 +1,108 @@
+var expect = require('expect.js');
+var stub = require('sinon').stub;
+
+var windowHandler = require('../../src/helper/window');
+var cookies = require('../../src/helper/cookies');
+
+describe('helpers cookies', function () {
+
+  beforeEach(function(){
+    var document = {
+      cookie: ''
+    }
+
+    stub(windowHandler, 'getDocument', function (message) {
+      return document;
+    });
+    stub(Date.prototype, 'getTime', function (message) {
+      return 0;
+    });
+  })
+
+  afterEach(function(){
+    windowHandler.getDocument.restore();
+    Date.prototype.getTime.restore();
+  })
+
+  it('create a cookie with exp', function () {
+
+    cookies.create('cookie_name', 'cookie value', 1);
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=Y29va2llIHZhbHVl; expires=Fri, 02 Jan 1970 00:00:00 GMT; path=/')
+
+  });
+
+  it('create a cookie without exp', function () {
+
+    cookies.create('cookie_name', 'cookie value');
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=Y29va2llIHZhbHVl; path=/')
+
+  });
+
+  it('returns null if the cookie does not exist', function () {
+
+    var value = cookies.read('cookie_name');
+    expect(value).to.be.eql(null);
+
+  });
+
+  it('returns the cookie value', function () {
+
+    cookies.create('cookie_name', 'cookie value');
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=Y29va2llIHZhbHVl; path=/')
+
+    var value = cookies.read('cookie_name');
+    expect(value).to.be.eql('cookie value')
+
+  });
+
+
+  it('should handle multiple cookies', function () {
+
+    windowHandler.getDocument.restore();
+    stub(windowHandler, 'getDocument', function (message) {
+      return {
+        cookie: 'cookie_name=Y29va2llIHZhbHVl; path=/; cookie_name2=Y29va2llIHZhbHVlMg; path=/'
+      };
+    });
+
+    var value = cookies.read('cookie_name2');
+    expect(value).to.be.eql('cookie value2')
+  });
+
+  it('returns the cookie value (with ;)', function () {
+
+    cookies.create('cookie_name', 'cookie; value');
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=Y29va2llOyB2YWx1ZQ; path=/')
+
+    var value = cookies.read('cookie_name');
+    expect(value).to.be.eql('cookie; value')
+
+  });
+
+  it('should reset the expiration', function () {
+
+    cookies.create('cookie_name', 'cookie; value');
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=Y29va2llOyB2YWx1ZQ; path=/')
+
+    cookies.erase('cookie_name');
+
+    expect(windowHandler.getDocument().cookie).to.be.eql('cookie_name=; expires=Wed, 31 Dec 1969 00:00:00 GMT; path=/')
+  });
+
+  it('handle cookie not available', function () {
+
+    windowHandler.getDocument.restore();
+    stub(windowHandler, 'getDocument', function (message) {
+      return {};
+    });
+    expect(function () {
+      cookies.create('cookie_name', 'cookie; value');
+    }).to.throwError();
+
+    expect(function () {
+      cookies.read('cookie_name');
+    }).to.throwError();
+
+  });
+
+});